CA1277791C - Method and apparatus for providing personalized telephone subscriber features at remote locations - Google Patents
Method and apparatus for providing personalized telephone subscriber features at remote locationsInfo
- Publication number
- CA1277791C CA1277791C CA000551633A CA551633A CA1277791C CA 1277791 C CA1277791 C CA 1277791C CA 000551633 A CA000551633 A CA 000551633A CA 551633 A CA551633 A CA 551633A CA 1277791 C CA1277791 C CA 1277791C
- Authority
- CA
- Canada
- Prior art keywords
- data
- exchange
- subscriber
- telephone
- local exchange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
- H04Q3/545—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised using a stored programme
- H04Q3/54508—Configuration, initialisation
- H04Q3/54525—Features introduction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/42229—Personal communication services, i.e. services related to one subscriber independent of his terminal and/or location
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/42229—Personal communication services, i.e. services related to one subscriber independent of his terminal and/or location
- H04M3/42263—Personal communication services, i.e. services related to one subscriber independent of his terminal and/or location where the same subscriber uses different terminals, i.e. nomadism
- H04M3/42272—Personal communication services, i.e. services related to one subscriber independent of his terminal and/or location where the same subscriber uses different terminals, i.e. nomadism whereby the subscriber registers to the terminals for personalised service provision
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/4228—Systems providing special services or facilities to subscribers in networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/0016—Arrangements providing connection between exchanges
- H04Q3/0029—Provisions for intelligent networking
- H04Q3/005—Personal communication services, e.g. provisions for portability of subscriber numbers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/38—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections
- H04M3/382—Graded-service arrangements, i.e. some subscribers prevented from establishing certain connections using authorisation codes or passwords
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/42—Systems providing special services or facilities to subscribers
- H04M3/42314—Systems providing special services or facilities to subscribers in private branch exchanges
- H04M3/4234—Remote access to features of PBX or home telephone systems-teleworking in a PBX
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13513—UPT - personal as opposed to terminal mobility, inc. number portability
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13515—Indexing scheme relating to selecting arrangements in general and for multiplex systems authentication, authorisation - fraud prevention
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13547—Indexing scheme relating to selecting arrangements in general and for multiplex systems subscriber, e.g. profile, database, database access
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S379/00—Telephonic communications
- Y10S379/903—Password
Abstract
METHOD AND APPARATUS FOR
PROVIDING PERSONALIZED TELEPHONE
SUBSCRIBER FEATURES AT REMOTE LOCATIONS
Abstract Personalized telephone features are made available to subscribers away from their home base. A nationally accessible data base system stores feature data in association with personal identification numbers. A subscriber wishing to use personalized features while away from the home base dials a special code from a station connected to any exchange which has access to the data base and presents the personal identification number. The corresponding feature data is retrieved from the data base and stored in the exchange in association with the station from which the request was initiated and telephone service will be rendered in that exchange with the subscriber's personalized telephone features. A temporary office arrangement may be established in which the personalized features will be immediately available on incoming and outgoingcalls for a period of time specified by the subscriber. In one embodiment the feature data is stored on a credit card and transmitted to the exchange by a card reader. The feature data is stored in the exchange and the features are made available to the subscriber without having to access a data base.
PROVIDING PERSONALIZED TELEPHONE
SUBSCRIBER FEATURES AT REMOTE LOCATIONS
Abstract Personalized telephone features are made available to subscribers away from their home base. A nationally accessible data base system stores feature data in association with personal identification numbers. A subscriber wishing to use personalized features while away from the home base dials a special code from a station connected to any exchange which has access to the data base and presents the personal identification number. The corresponding feature data is retrieved from the data base and stored in the exchange in association with the station from which the request was initiated and telephone service will be rendered in that exchange with the subscriber's personalized telephone features. A temporary office arrangement may be established in which the personalized features will be immediately available on incoming and outgoingcalls for a period of time specified by the subscriber. In one embodiment the feature data is stored on a credit card and transmitted to the exchange by a card reader. The feature data is stored in the exchange and the features are made available to the subscriber without having to access a data base.
Description
1~777~
METHOD AND APPARATUS FOR
PROVIDING PERSONALIZED TELEPHONE
SUBSCRIBER FEATURES AT REMOTE LOCATIONS
Back~round of the Invention 1. Field of the Invention The invention relates to telecommunication switching systems, and more particularly, to providing a subscriber with personalized telecomrnunications features for calls made from stations remote from the subscriber's home base.
_ Description of the Prior Art A wide variety of convenient features are available to enhance the usefulness of the telephone to subscribers, including such features as speed calling, call waiting, conference calling and the like. In prior art systems, data defining subscribed features are recorded in a feature data block associated with the subscriber's home base telephone in the telephone exchan~e to which the 15 subscriber's horne base is connected. The local exchange consults the recorded data to determine what service features should be provided to calls originating from and terminating on the subscriber's home base telephone A problem of prior art systems is that the telephone features of an individual subscriber areavailable only at the subscriber's home base and not, for example, when the 20 subscriber places a call from a pay station or other remote locations such as a hotel room, connected to another telephone exchange One prior art publication suggests a class of service transfer feature in an office communication system.
Summary of the Invention The prior art problems are solved and an advance in the art is made in 25 accordance with the principles of this invention by providing personalized features on the basis of personal identification of the subscriber. In accordance with this invention, data defining a subscriber's personalized set of telecommunication features is temporarily stored in a local exchange in association with any subscriber line on which the subscriber is identified. In one embodiment of the 30 invention, personalized feature data is stored in a data base remote from the local exchange together with a subscriber's personal identification number such as a credlt card number The receipt of a subscriber's personal identification number causes the data base to be searched and causes the retrieved personalized feature data to be entered in the exchange serving the subscriber line from which the personal identification number was received.
Advantageously, the personalized feature data may be stored in a nationally accessible data base allowing the subscriber to have the features available in other cities.
In one embodiment of the invention, the feature data includes a speed calling list. Advantageously, this allows a subscriber to use abbreviated dialing from the remote location.
In one specific embodiment, the subscriber may supply data defining a duration to the remote telephone exchange, which causes the exchange to retain the data in association with the affected line for the defined time period. Advantageously, this provides a convenient way to set up a temporary office telephone away from the home base and conveniently allows features relating to incoming calls, such as call screening, to be applied to the temporary of~ice phone.
In an alternative embodiment, the personalized feature data is carried by the subscriber, for example, on a credit card which may be read by a card reader. The data from the credit card is transmitted over a subscriber line to the local exchange where it is temporarily stored in association with the subscriber line from which it is received.
Advantageously, in this arrangement no separate data base is required.
In accordance with one aspect of the invention there is provided the method of providing personalized telephone features to a subscriber using a station terminal connected to a local exchange comprising the steps of: a. receiving from said subscriber a personal identification number: b.
retrieving from a data base remote from said local exchange data defining a set of features corresponding to said received personal identification number; c. recording said data defining said set of features in said local exchange; d.
receiving from said subscriber call associated data; and e.
providing telephone service from said local exchange in f'~
E~
7'77~
2a accordance with said call associated data and said data recorded in said local exchange.
In accordance with another aspect of the invention therle is provided a telecommunication system comprising: a local exchange connectable to telephone terminals: a data base system for storing data defining telephone features in association with identification numbers; data base access means connected to said data base and said local exchange and responsive to signals including an identification number from said local exchange for retrieving feature data associated with said identification number and transmitting said retrieved data to said local exchange; processor means in said local exchange responsive to requests for service from a connected terminal to transmit said signals to said data base access means and to provide call handling service defined by said transmitted feature data.
Brief Description of the Drawina The invention may be better understood from the following detailed description when read with reference to the drawing in whi¢h:
FIG. 1 shows a local telephone exchange together with a data base system accessible from a plurality of local exchanges;
FIGS. 2 and 3 define data fields in the data base system; and FIGS. 4, 5 and 6 are flow diagram representations of functions carried in the local exchange of FIG. 1.
Detailed Description FIG. 1 shows an illustrative embodiment in which several local exchanges 110 are connected via traffic service position system (TSPS) 120 to a common data base system 140.
Connected to each local exchange are a plurality of telephone station terminals, such as set 112 which may be any standard and well-known subscriber set. Also shown in FIG. 1 i5 a telephone set 114 incorporating a card reader. This, for example, may be a coin phone incorporating a card reader such as may be found at airports and which are commercially . ~ .
~77~g1 available. The card reader in the commercially available arrangements is particularly adapted for reading credit card and transmitting the data from the credit card to the local exchange. The local exchanges are each controlled by aninternal processor ] 13 which has access to a local memory 111 for storing feature 5 data in association with a subscriber terminal (e.g., 112). A clock arrangement 116 in the local exchange provides signals used for defining time when a subscriber requests service for a specified period of time. Each local exchange 110 is connected to a TSPS trunk circuit 130 in a standard fashion by means of trunk 115. The TSPS trunk circuit 130 may be connected to an 10 interexchange carrier switch, commonly referred to as a toll office, by means of trunk 117. The traffic service position system (TSPS) 120 is a switching system which in this embodiment is used to provide access to the common data base system 140. Numerous data base access systems are known and for the purposes of this invention, any acceptable system providing access from local exchanges to 15 a common data base 140 may be used.
The local exchange may be, for example, the well-known SESSTM
switch developed by AT&T and described in the AT&T Technical ~ July-August, 1985, ~ol. 64, No. 6, Part 2. The }ocal exchange communicates with the connected stations 112, 114 and the TSPS in a well-known manner. The 20 TSPS 120 may, for example, be the TSPS No. lB developed by AT&T and described in The Bell System Technical Joumal, March, 1983, Vol. 62, No. 3, Part 3. One of the functions of the TSPS system is to provide access to the database system 140. For example, for the purposes of verifying the validity of a credit card number when a caller at one of the stations 112, 114 connected to the 25 local exchange 110 makes a credit card call. The data base 140 is a national data base and accessible from a large number of local exchanges via associated TSPS.
Customarily a number of local exchanges 110 are connected to a single TSPS 120 and a number of TSPS have access to a single data base system 140 via a nationalnetwork using common channel interoffice signaling (CCIS). Such a network is 30 described in The Bell System Technical Journal, September, 1982, Vol. 61, No. 7, Part 3.
In this illustrative embodiment of the invention, the data base 140 contains information regarding the service features of the system to which subscribers have subscribed. To use the features at a remote location, a subscriber 35 provides the local exchange with a special code and an identification number 1~7'77~
which causes the exchange to consult a data base 140 via TSPS 120, retrieve the data defining the features for the calling subscriber and store the data in a local memory l l l. In this illustrative embodiment, the data base field, in addition to the credit card number, contains a word defining features to which the credit card 5 subscriber is entitled as well as data defining speed calling numbers. Speed calling, also referred to as abbreviated dialing, is a special feature whereby asubscriber dials a couple of digits which is interpreted by the local exchange to represent a full 10 digit telephone number. Such a data field layout is shown inFIG. 2. The data base may also contain the identity of the customer's preferred 10 long distance carrier, to be used in making long distance calls from a remotelocation. FIG. 2 depicts an information field column defining the data stored inthe data base, and a content column. The same data stored in the data base may also be stored on magnetic material on a personalized card, such as a credit card.
Such a card may be read by a known card reading telephone terminal and 15 transmitted to the local exchange in a well-known manner and stored in the memory of the local exchange. The feature validity field shown in FIG. 2 is coded in binary and in this embodiment comprises 8 bits or 1 byte. FIG. 3 further identifies the bits of the feature validity field. As indicated in FIG. 3, the first bit of the feature validity field indicates whether or not the swbscriber is entitled to 20 have features transferred to a remote location. The second through eighth bit, in this particular embodiment, indicate the specific features to which the calling subscriber has subscribed. In each case, the validity or entitlement of these features may be indicated by a 1 or a 0 in the appropriate bit position of the feature validity byte. The features listed in FIG. 3, other than the TEMPORARY
25 O~lCE feature are standard services available to telephone subscribers.
Numerous other features can be identified by the feature validity field. The TEMPORARY OFFICE feature is a feature which allows the subscriber to have all the other features listed in the feature field applied to the temporary location for a prescribed period of time.
30 Sequence f Operation In this illustrative embodiment the feature transfer service is implemented by actions and interactions of several entities, including the localexchange 110, the TSPS 120 and the data base system 140. The systems comprise program controlled processors for carrying out the various functions.
35 The processor in each of the systems may be, for example, the AT&T 3B20D
processor described in the Bell Systcm Technical Journal, January 1983, Yolume 62, No. l, Part 2. The functions to be per~olmed for nonnal call handlingby the local exch~lnge 110 and the TSPS 120 are outlined in the above referencedA~r&~T Techllical Journa} on the SESS switch and the above referenced Bell 5 System Technic~l Journal on TSPS No. lB, respectively. A data base system, which may be used for the data base system 14û is described in the Bell System Technical Journal, September 1982, Volume 61, No. 1, Part 3, entitled "Stored Program Controlled Network". This journal describes a data base system together with a network system which makes the data base accessible from a number of 10 TSPS and local exchanges. FIGS. 4 through 6 define, in flowchart form, the program to be executed by the processor 113 of the local exchange in implementing the feature transfer service. As stated earlier, the local exchange 110 of the illustrative system includes a program controlled SESS switch controlled by a 3B20D program controlled processor. This processor operates 15 under operating system programs derived from the well-known UNIX operating system, and described in the aforementioned January 1983 Bell System Technical Journal.
Rcferring to FIG. 4, block 401 depicts off-hook detcction and 403 depicts the provision of dial tone and the connection of a digit receiver which are 20 normal functions performed by a local exchange In decision block 405 a test is made on the receive~d digits to determine the existence of a .special string which is referred to herein as *TF which signifies a request for transfer feature service or a string referred to as *CC which signifies a request to enter transfer features from a credit card. These characters are usually available on the telephone sets, if not, 25 any other string may be substituted. Alternatively, a speech recognition unit (not shown in the drawing) could be provided to recognize a spoken request for service by the customer. When the *TF code is dialed, it is intelpreted to mean that thesubscriber desires to have personalized telephone features stored in the credit card data base made available to the line from which this call is originated. In the 30 event that the *TF code is detected, the local exchange 110 sets up a path from the originating line to the TSPS 120 and alerts the TSPS to prepare to receive acredit card number. This is depicted in block 407. The TSPS, over the established path, may prompt the subscriber for the credit card number or other personal identification number or may wait for the subscriber to dial the number35 without a prompt. As an alternative to dialing the personal identification number, lZ~77 a subscriber may use a well-known card reading telephone } 14 to enter the rlumber. It is a function of the TSPS to transmit the received credit card number to the data base system 140. This is a well-known function commonly performed by the TSPS which does not need to be described herein in detail for an S understanding of the invention. The data base system 140 responds to the receipt of the 14-digit credit card number from the TSPS by addressing a corresponding data item in the data base and retrieving the associated data block. The contents of the data block is outlined in PIGS. 2 and 3. As shown in FIG. 2, the first item of data block comprises the card number which may be used simply for checking 10 purposes to ascertain that the proper data has been accessed. In the event that the card number is invalid or service is not authorized, a denial message is returned to the local exchange. The functions of the TSPS and the data base system and the retrieval of data and the checking are well-known functions which are commonly performed by such systems in connection with credit card calls, including the 15 provision of a denial message. In the event that service is authorized, the data base system commonly returns an authorization message to the TSPS which responds by starting a billing record and by transmitting the ~uthori~ation message and billing ID to the local exchange. In a system in accordance with this invention, the data base system transmits the retrieved data block to the TSPS and 20 the TSPS in turn transmits the data block together with billing identification number, which may be the credit card number, to the local exchange. That the local exchange waits for the receipt of the data block and billing ID or a denial message is depicted in block 409. In a case of a denial the call may be terminated as indicated in block 410. Otherwise, an advance is made to block 41125 where the FEATURE TRANSFER bit of the received data is examined to determine whether the subscriber is entitled to the feature transfer service. If not, normal call processing will be provided in a well-known manner. In the event the*CC characters are detected in block 405, an advance is made to block 402 to receive the card data transmitted from a card reading terminal and defining the 30 desired feature set as depicted in FIGs 2 and 3. Thereafter, the billing ID, or card number is transmitted to TSPS for billing purposes, as depicted in block 404.
Subsequently, an advance is made to block 411 to examine the FE~TURE
TRANSPER bit of the received data.
~'~77 If the subscriber is entitled to the feature transfer service, a temporary memory address is entered in the feature data block no~nally associated with thecalling line and feature data, as defined by the remaining bits of the feature validity field, are stored together with the speed calling list in the memory 5 location defined by the temporary address. These last named functions are depicted in block 413. A further test is made in block 415 in FIG. 5 tO determine if the TEMPORARY OFFICE bit, bit 6 of the feature validity field, has been set.
If not, a message is provided to the subscriber that the Feature Transfer feature has been invoked and the call is handled in a manner described later with respect 10 tO blocks 425 through 431. In the event that the test in block 415 indicates that the temporary office bit (bit 6) of the feature validity field has been set, the billing ID received from the TSPS in block 40g is stored in the temporary location created in block 413. Additionally, as indicated in block 419, a message is sent to the subscriber that the temporary office feature may be invoked by dialing an 15 access code and a code indicating a time period. The message may be in the forrn of an audible message or tone signals generated in a well-known fashion. The local exchange, upon receiving the access code and time perio~ indication, addx the received value of the time period to the system's current time and stores the computed value in a location in memory referred to herein as the time-out item 20 The local exchange includes a time clock 116 which provides system current time in a well-known fashion, In block 423 a message is provided to the subscriber that the temporary office feature has been invoked, In block 425, after the transfer feature has been invoked, with or without the temporary office feature, the subscriber is prompted to enter the call 25 signaling information, i.e., the number the subscriber wishes to reach. Thereafter the call is handled in a normal fashion including standard credit card billing until an on-hook is detected or the subscriber pushes the # sign. A test is made in block 429 to determine whether the # sign or on-hook sign was received. In the event it is the # sign, the sequence of blocks 425 through 429 is repeated, 30 allowing the subscriber to make another call without going through the entirecalling sequence. In the event that an on-hook sign has been received in block 427, an advance is made to block 430 to determine if the Temporary Office feature is in effect. If it is, the call is terminated in a normal fashion in block 431; otherwise the temporary address is deleted in block 433 before the call 35 is terminated. This deletion will disable the personalized feature from being used 1,'~77t73 on subsequent calls.
Referring again to FIG. 4, in block 405 a test is made to determine if Ithe ~TF or *CC symbol was dialed by the subscriber. If so, the sequence described above is carried out; if not, the feature data block associated with the 5 calling line in the local exchange is read as indicated in block 440 of FIG. 6 and a test is made in block 441 to determine if a temporary address exists in the feature block. If not, the call is processed in a norrnal fashion without reference to the transfer feature, as indicated in block 443. If a temporary address is found, it is taken as an indication that feature transfer was established previously. A further 10 test is made, however, to determine whether the time period specified by the subscriber and recorded in block 421 has expired. In block 442 a test is made todetermine if the value of the time-out item is less than or equal to the currenttime. If it is not, the billing ID is retrieved from the temporary location and transmitted to TSPS, as indicated in block 445, for use in billing the subsequent 15 call. Thereafter, the subscriber is prompted to enter the terminating directory number, as indicated in block 425 in FIG. 5, and the sequence subseqwent to block 425 is carried out. In the event that the test in block 442 indicates that the time-owt value is not greater than the cwrrent time, the temporary address is deleted from the feature data block, as shown in block 4447 and normal call 20 processing is provided in block 443.
It is to be understood that the above described arrangement is merely illustrative of the application of the principles of the invention; numerous other arrangements may be devised by those skilled in the art without departing from the spirit and scope of the invention described herein. It is therefore intended that 25 such changes or modifications be covered by the following claims.
METHOD AND APPARATUS FOR
PROVIDING PERSONALIZED TELEPHONE
SUBSCRIBER FEATURES AT REMOTE LOCATIONS
Back~round of the Invention 1. Field of the Invention The invention relates to telecommunication switching systems, and more particularly, to providing a subscriber with personalized telecomrnunications features for calls made from stations remote from the subscriber's home base.
_ Description of the Prior Art A wide variety of convenient features are available to enhance the usefulness of the telephone to subscribers, including such features as speed calling, call waiting, conference calling and the like. In prior art systems, data defining subscribed features are recorded in a feature data block associated with the subscriber's home base telephone in the telephone exchan~e to which the 15 subscriber's horne base is connected. The local exchange consults the recorded data to determine what service features should be provided to calls originating from and terminating on the subscriber's home base telephone A problem of prior art systems is that the telephone features of an individual subscriber areavailable only at the subscriber's home base and not, for example, when the 20 subscriber places a call from a pay station or other remote locations such as a hotel room, connected to another telephone exchange One prior art publication suggests a class of service transfer feature in an office communication system.
Summary of the Invention The prior art problems are solved and an advance in the art is made in 25 accordance with the principles of this invention by providing personalized features on the basis of personal identification of the subscriber. In accordance with this invention, data defining a subscriber's personalized set of telecommunication features is temporarily stored in a local exchange in association with any subscriber line on which the subscriber is identified. In one embodiment of the 30 invention, personalized feature data is stored in a data base remote from the local exchange together with a subscriber's personal identification number such as a credlt card number The receipt of a subscriber's personal identification number causes the data base to be searched and causes the retrieved personalized feature data to be entered in the exchange serving the subscriber line from which the personal identification number was received.
Advantageously, the personalized feature data may be stored in a nationally accessible data base allowing the subscriber to have the features available in other cities.
In one embodiment of the invention, the feature data includes a speed calling list. Advantageously, this allows a subscriber to use abbreviated dialing from the remote location.
In one specific embodiment, the subscriber may supply data defining a duration to the remote telephone exchange, which causes the exchange to retain the data in association with the affected line for the defined time period. Advantageously, this provides a convenient way to set up a temporary office telephone away from the home base and conveniently allows features relating to incoming calls, such as call screening, to be applied to the temporary of~ice phone.
In an alternative embodiment, the personalized feature data is carried by the subscriber, for example, on a credit card which may be read by a card reader. The data from the credit card is transmitted over a subscriber line to the local exchange where it is temporarily stored in association with the subscriber line from which it is received.
Advantageously, in this arrangement no separate data base is required.
In accordance with one aspect of the invention there is provided the method of providing personalized telephone features to a subscriber using a station terminal connected to a local exchange comprising the steps of: a. receiving from said subscriber a personal identification number: b.
retrieving from a data base remote from said local exchange data defining a set of features corresponding to said received personal identification number; c. recording said data defining said set of features in said local exchange; d.
receiving from said subscriber call associated data; and e.
providing telephone service from said local exchange in f'~
E~
7'77~
2a accordance with said call associated data and said data recorded in said local exchange.
In accordance with another aspect of the invention therle is provided a telecommunication system comprising: a local exchange connectable to telephone terminals: a data base system for storing data defining telephone features in association with identification numbers; data base access means connected to said data base and said local exchange and responsive to signals including an identification number from said local exchange for retrieving feature data associated with said identification number and transmitting said retrieved data to said local exchange; processor means in said local exchange responsive to requests for service from a connected terminal to transmit said signals to said data base access means and to provide call handling service defined by said transmitted feature data.
Brief Description of the Drawina The invention may be better understood from the following detailed description when read with reference to the drawing in whi¢h:
FIG. 1 shows a local telephone exchange together with a data base system accessible from a plurality of local exchanges;
FIGS. 2 and 3 define data fields in the data base system; and FIGS. 4, 5 and 6 are flow diagram representations of functions carried in the local exchange of FIG. 1.
Detailed Description FIG. 1 shows an illustrative embodiment in which several local exchanges 110 are connected via traffic service position system (TSPS) 120 to a common data base system 140.
Connected to each local exchange are a plurality of telephone station terminals, such as set 112 which may be any standard and well-known subscriber set. Also shown in FIG. 1 i5 a telephone set 114 incorporating a card reader. This, for example, may be a coin phone incorporating a card reader such as may be found at airports and which are commercially . ~ .
~77~g1 available. The card reader in the commercially available arrangements is particularly adapted for reading credit card and transmitting the data from the credit card to the local exchange. The local exchanges are each controlled by aninternal processor ] 13 which has access to a local memory 111 for storing feature 5 data in association with a subscriber terminal (e.g., 112). A clock arrangement 116 in the local exchange provides signals used for defining time when a subscriber requests service for a specified period of time. Each local exchange 110 is connected to a TSPS trunk circuit 130 in a standard fashion by means of trunk 115. The TSPS trunk circuit 130 may be connected to an 10 interexchange carrier switch, commonly referred to as a toll office, by means of trunk 117. The traffic service position system (TSPS) 120 is a switching system which in this embodiment is used to provide access to the common data base system 140. Numerous data base access systems are known and for the purposes of this invention, any acceptable system providing access from local exchanges to 15 a common data base 140 may be used.
The local exchange may be, for example, the well-known SESSTM
switch developed by AT&T and described in the AT&T Technical ~ July-August, 1985, ~ol. 64, No. 6, Part 2. The }ocal exchange communicates with the connected stations 112, 114 and the TSPS in a well-known manner. The 20 TSPS 120 may, for example, be the TSPS No. lB developed by AT&T and described in The Bell System Technical Joumal, March, 1983, Vol. 62, No. 3, Part 3. One of the functions of the TSPS system is to provide access to the database system 140. For example, for the purposes of verifying the validity of a credit card number when a caller at one of the stations 112, 114 connected to the 25 local exchange 110 makes a credit card call. The data base 140 is a national data base and accessible from a large number of local exchanges via associated TSPS.
Customarily a number of local exchanges 110 are connected to a single TSPS 120 and a number of TSPS have access to a single data base system 140 via a nationalnetwork using common channel interoffice signaling (CCIS). Such a network is 30 described in The Bell System Technical Journal, September, 1982, Vol. 61, No. 7, Part 3.
In this illustrative embodiment of the invention, the data base 140 contains information regarding the service features of the system to which subscribers have subscribed. To use the features at a remote location, a subscriber 35 provides the local exchange with a special code and an identification number 1~7'77~
which causes the exchange to consult a data base 140 via TSPS 120, retrieve the data defining the features for the calling subscriber and store the data in a local memory l l l. In this illustrative embodiment, the data base field, in addition to the credit card number, contains a word defining features to which the credit card 5 subscriber is entitled as well as data defining speed calling numbers. Speed calling, also referred to as abbreviated dialing, is a special feature whereby asubscriber dials a couple of digits which is interpreted by the local exchange to represent a full 10 digit telephone number. Such a data field layout is shown inFIG. 2. The data base may also contain the identity of the customer's preferred 10 long distance carrier, to be used in making long distance calls from a remotelocation. FIG. 2 depicts an information field column defining the data stored inthe data base, and a content column. The same data stored in the data base may also be stored on magnetic material on a personalized card, such as a credit card.
Such a card may be read by a known card reading telephone terminal and 15 transmitted to the local exchange in a well-known manner and stored in the memory of the local exchange. The feature validity field shown in FIG. 2 is coded in binary and in this embodiment comprises 8 bits or 1 byte. FIG. 3 further identifies the bits of the feature validity field. As indicated in FIG. 3, the first bit of the feature validity field indicates whether or not the swbscriber is entitled to 20 have features transferred to a remote location. The second through eighth bit, in this particular embodiment, indicate the specific features to which the calling subscriber has subscribed. In each case, the validity or entitlement of these features may be indicated by a 1 or a 0 in the appropriate bit position of the feature validity byte. The features listed in FIG. 3, other than the TEMPORARY
25 O~lCE feature are standard services available to telephone subscribers.
Numerous other features can be identified by the feature validity field. The TEMPORARY OFFICE feature is a feature which allows the subscriber to have all the other features listed in the feature field applied to the temporary location for a prescribed period of time.
30 Sequence f Operation In this illustrative embodiment the feature transfer service is implemented by actions and interactions of several entities, including the localexchange 110, the TSPS 120 and the data base system 140. The systems comprise program controlled processors for carrying out the various functions.
35 The processor in each of the systems may be, for example, the AT&T 3B20D
processor described in the Bell Systcm Technical Journal, January 1983, Yolume 62, No. l, Part 2. The functions to be per~olmed for nonnal call handlingby the local exch~lnge 110 and the TSPS 120 are outlined in the above referencedA~r&~T Techllical Journa} on the SESS switch and the above referenced Bell 5 System Technic~l Journal on TSPS No. lB, respectively. A data base system, which may be used for the data base system 14û is described in the Bell System Technical Journal, September 1982, Volume 61, No. 1, Part 3, entitled "Stored Program Controlled Network". This journal describes a data base system together with a network system which makes the data base accessible from a number of 10 TSPS and local exchanges. FIGS. 4 through 6 define, in flowchart form, the program to be executed by the processor 113 of the local exchange in implementing the feature transfer service. As stated earlier, the local exchange 110 of the illustrative system includes a program controlled SESS switch controlled by a 3B20D program controlled processor. This processor operates 15 under operating system programs derived from the well-known UNIX operating system, and described in the aforementioned January 1983 Bell System Technical Journal.
Rcferring to FIG. 4, block 401 depicts off-hook detcction and 403 depicts the provision of dial tone and the connection of a digit receiver which are 20 normal functions performed by a local exchange In decision block 405 a test is made on the receive~d digits to determine the existence of a .special string which is referred to herein as *TF which signifies a request for transfer feature service or a string referred to as *CC which signifies a request to enter transfer features from a credit card. These characters are usually available on the telephone sets, if not, 25 any other string may be substituted. Alternatively, a speech recognition unit (not shown in the drawing) could be provided to recognize a spoken request for service by the customer. When the *TF code is dialed, it is intelpreted to mean that thesubscriber desires to have personalized telephone features stored in the credit card data base made available to the line from which this call is originated. In the 30 event that the *TF code is detected, the local exchange 110 sets up a path from the originating line to the TSPS 120 and alerts the TSPS to prepare to receive acredit card number. This is depicted in block 407. The TSPS, over the established path, may prompt the subscriber for the credit card number or other personal identification number or may wait for the subscriber to dial the number35 without a prompt. As an alternative to dialing the personal identification number, lZ~77 a subscriber may use a well-known card reading telephone } 14 to enter the rlumber. It is a function of the TSPS to transmit the received credit card number to the data base system 140. This is a well-known function commonly performed by the TSPS which does not need to be described herein in detail for an S understanding of the invention. The data base system 140 responds to the receipt of the 14-digit credit card number from the TSPS by addressing a corresponding data item in the data base and retrieving the associated data block. The contents of the data block is outlined in PIGS. 2 and 3. As shown in FIG. 2, the first item of data block comprises the card number which may be used simply for checking 10 purposes to ascertain that the proper data has been accessed. In the event that the card number is invalid or service is not authorized, a denial message is returned to the local exchange. The functions of the TSPS and the data base system and the retrieval of data and the checking are well-known functions which are commonly performed by such systems in connection with credit card calls, including the 15 provision of a denial message. In the event that service is authorized, the data base system commonly returns an authorization message to the TSPS which responds by starting a billing record and by transmitting the ~uthori~ation message and billing ID to the local exchange. In a system in accordance with this invention, the data base system transmits the retrieved data block to the TSPS and 20 the TSPS in turn transmits the data block together with billing identification number, which may be the credit card number, to the local exchange. That the local exchange waits for the receipt of the data block and billing ID or a denial message is depicted in block 409. In a case of a denial the call may be terminated as indicated in block 410. Otherwise, an advance is made to block 41125 where the FEATURE TRANSFER bit of the received data is examined to determine whether the subscriber is entitled to the feature transfer service. If not, normal call processing will be provided in a well-known manner. In the event the*CC characters are detected in block 405, an advance is made to block 402 to receive the card data transmitted from a card reading terminal and defining the 30 desired feature set as depicted in FIGs 2 and 3. Thereafter, the billing ID, or card number is transmitted to TSPS for billing purposes, as depicted in block 404.
Subsequently, an advance is made to block 411 to examine the FE~TURE
TRANSPER bit of the received data.
~'~77 If the subscriber is entitled to the feature transfer service, a temporary memory address is entered in the feature data block no~nally associated with thecalling line and feature data, as defined by the remaining bits of the feature validity field, are stored together with the speed calling list in the memory 5 location defined by the temporary address. These last named functions are depicted in block 413. A further test is made in block 415 in FIG. 5 tO determine if the TEMPORARY OFFICE bit, bit 6 of the feature validity field, has been set.
If not, a message is provided to the subscriber that the Feature Transfer feature has been invoked and the call is handled in a manner described later with respect 10 tO blocks 425 through 431. In the event that the test in block 415 indicates that the temporary office bit (bit 6) of the feature validity field has been set, the billing ID received from the TSPS in block 40g is stored in the temporary location created in block 413. Additionally, as indicated in block 419, a message is sent to the subscriber that the temporary office feature may be invoked by dialing an 15 access code and a code indicating a time period. The message may be in the forrn of an audible message or tone signals generated in a well-known fashion. The local exchange, upon receiving the access code and time perio~ indication, addx the received value of the time period to the system's current time and stores the computed value in a location in memory referred to herein as the time-out item 20 The local exchange includes a time clock 116 which provides system current time in a well-known fashion, In block 423 a message is provided to the subscriber that the temporary office feature has been invoked, In block 425, after the transfer feature has been invoked, with or without the temporary office feature, the subscriber is prompted to enter the call 25 signaling information, i.e., the number the subscriber wishes to reach. Thereafter the call is handled in a normal fashion including standard credit card billing until an on-hook is detected or the subscriber pushes the # sign. A test is made in block 429 to determine whether the # sign or on-hook sign was received. In the event it is the # sign, the sequence of blocks 425 through 429 is repeated, 30 allowing the subscriber to make another call without going through the entirecalling sequence. In the event that an on-hook sign has been received in block 427, an advance is made to block 430 to determine if the Temporary Office feature is in effect. If it is, the call is terminated in a normal fashion in block 431; otherwise the temporary address is deleted in block 433 before the call 35 is terminated. This deletion will disable the personalized feature from being used 1,'~77t73 on subsequent calls.
Referring again to FIG. 4, in block 405 a test is made to determine if Ithe ~TF or *CC symbol was dialed by the subscriber. If so, the sequence described above is carried out; if not, the feature data block associated with the 5 calling line in the local exchange is read as indicated in block 440 of FIG. 6 and a test is made in block 441 to determine if a temporary address exists in the feature block. If not, the call is processed in a norrnal fashion without reference to the transfer feature, as indicated in block 443. If a temporary address is found, it is taken as an indication that feature transfer was established previously. A further 10 test is made, however, to determine whether the time period specified by the subscriber and recorded in block 421 has expired. In block 442 a test is made todetermine if the value of the time-out item is less than or equal to the currenttime. If it is not, the billing ID is retrieved from the temporary location and transmitted to TSPS, as indicated in block 445, for use in billing the subsequent 15 call. Thereafter, the subscriber is prompted to enter the terminating directory number, as indicated in block 425 in FIG. 5, and the sequence subseqwent to block 425 is carried out. In the event that the test in block 442 indicates that the time-owt value is not greater than the cwrrent time, the temporary address is deleted from the feature data block, as shown in block 4447 and normal call 20 processing is provided in block 443.
It is to be understood that the above described arrangement is merely illustrative of the application of the principles of the invention; numerous other arrangements may be devised by those skilled in the art without departing from the spirit and scope of the invention described herein. It is therefore intended that 25 such changes or modifications be covered by the following claims.
Claims (14)
1. The method of providing personalized telephone features to a subscriber using a station terminal connected to a local exchange comprising thesteps of:
a. receiving from said subscriber a personal identification number;
b. retrieving from a data base remote from said local exchange data defining a set of features corresponding to said received personal identification number;
c. recording said data defining said set of features in said local exchange;
d. receiving from said subscriber call associated data; and e. providing telephone service from said local exchange in accordance with said call associated data and said data recorded in said local exchange.
a. receiving from said subscriber a personal identification number;
b. retrieving from a data base remote from said local exchange data defining a set of features corresponding to said received personal identification number;
c. recording said data defining said set of features in said local exchange;
d. receiving from said subscriber call associated data; and e. providing telephone service from said local exchange in accordance with said call associated data and said data recorded in said local exchange.
2. The method of providing personalized telephone features to a subscriber from any station of a plurality of independent telephone exchanges comprising me steps of:
a. storing personal subscriber identification numbers in a data base accessible from all of said exchanges together with feature data defining a set of personalized telephone features for each of said personal identification numbers;
b. receiving one of said personal identification numbers from a station connected to one of said exchanges;
c. accessing said data base from said one exchange and retrieving from said database feature data defining a set of personaliæd telephone featurescorresponding to said one received personal identification number;
d. recording said retrieved feature data in said one exchange;
e. receiving call originating data from said connected station at said one exchange; and f. providing telephone service to said station in accordance with said call originating data and said feature data recorded in said one exchange.
a. storing personal subscriber identification numbers in a data base accessible from all of said exchanges together with feature data defining a set of personalized telephone features for each of said personal identification numbers;
b. receiving one of said personal identification numbers from a station connected to one of said exchanges;
c. accessing said data base from said one exchange and retrieving from said database feature data defining a set of personaliæd telephone featurescorresponding to said one received personal identification number;
d. recording said retrieved feature data in said one exchange;
e. receiving call originating data from said connected station at said one exchange; and f. providing telephone service to said station in accordance with said call originating data and said feature data recorded in said one exchange.
3. The method in accordance with claim 2 wherein said method further comprises the step of disabling further use of said data recorded in said one exchange in response to a call termination by said subscriber.
4. The method in accordance with claim 2 further comprising:
receiving from said connected station data defining time; and providing telephone service in accordance with said feature data recorded in said exchange for a period of time defined by said data defining time.
receiving from said connected station data defining time; and providing telephone service in accordance with said feature data recorded in said exchange for a period of time defined by said data defining time.
5. The method of providing personalized telephone features to a telephone credit card subscriber comprising:
recording feature data defining subscriber personalized telephone features on a card;
transmitting the recorded featured data to a local exchange by a station set including a card reading device connected to the local exchange;
recording the transmitted feature data in the local exchange;
receiving call data from said station set at said local exchange; and providing telephone service at said local exchange in accordance with said received call data and said feature data recorded in said local exchange.
recording feature data defining subscriber personalized telephone features on a card;
transmitting the recorded featured data to a local exchange by a station set including a card reading device connected to the local exchange;
recording the transmitted feature data in the local exchange;
receiving call data from said station set at said local exchange; and providing telephone service at said local exchange in accordance with said received call data and said feature data recorded in said local exchange.
6. The method of providing personalized telephone features to a subscriber in a telecommunication system comprising a plurality of local exchanges having subscriber terminals connected thereto and a data base accessible from said plurality of exchanges for storing personalized feature data, comprising the steps of:
a receiving at one of said local exchanges from one of said terminals a request for telephone service using predefined personalized features;
b. receiving a personal identification number at said one exchange from said one terminal;
c. accessing said data base from said one exchange and retrieving from said data base feature data associated with said personal identification number;
d. storing data retrieved from said data base in said local exchange in association with said one terminal;
e. receiving at said one exchange call signaling information from said one terminal; and f. responding to said received call signaling information to provide personalized service defined by said feature data stored in association with said one terminal.
a receiving at one of said local exchanges from one of said terminals a request for telephone service using predefined personalized features;
b. receiving a personal identification number at said one exchange from said one terminal;
c. accessing said data base from said one exchange and retrieving from said data base feature data associated with said personal identification number;
d. storing data retrieved from said data base in said local exchange in association with said one terminal;
e. receiving at said one exchange call signaling information from said one terminal; and f. responding to said received call signaling information to provide personalized service defined by said feature data stored in association with said one terminal.
7. The method in accordance with claim 6 and further comprising the step of disabling further use of said data recorded in said one exchange in response to a call termination signal from said one terminal.
8. The method in accordance with claim 6 in a telecommunication system wherein said retrieved data is stored in memory, and further comprising the step of examining said memory for said stored data in response to a subsequent request for service from said one terminal and if data is stored in said memory providing service features to said terminal defined by said data stored in said memory.
9. The method in accordance with claim 6 in a telecommunication system wherein said retrieved data is stored in memory and wherein said local exchange comprises timing means and the method further comprises the step of receiving from said one terminal data defining a time period and the step of preventing provision of service in accordance with said stored data in response to a subsequent request for service received after expiration of said time period.
10. The method in accordance with claim 6 wherein stored data comprises abbreviated dialing data and said method comprises the step of responding to call signaling associated with said one terminal defining an abbreviated dialing code and the step of completing a call to a directory numberdefined in said stored data in association with said abbreviated dialing code.
11. A telecommunication system comprising:
a local exchange connectable to telephone terminals:
a data base system for storing data defining telephone features in association with identification numbers;
data base access means connected to said data base and said local exchange and responsive to signals including an identification number from said local exchange for retrieving feature data associated with said identification number and transmitting said retrieved data to said local exchange;
processor means in said local exchange responsive to requests for service from a connected terminal to transmit said signals to said data base access means and to provide call handling service defined by said transmitted feature data.
a local exchange connectable to telephone terminals:
a data base system for storing data defining telephone features in association with identification numbers;
data base access means connected to said data base and said local exchange and responsive to signals including an identification number from said local exchange for retrieving feature data associated with said identification number and transmitting said retrieved data to said local exchange;
processor means in said local exchange responsive to requests for service from a connected terminal to transmit said signals to said data base access means and to provide call handling service defined by said transmitted feature data.
12. A telecommunication system comprising:
a plurality of local exchanges having telephone terminals connected thereto;
a data base system for storing data defining telephone features in association with identification numbers;
data base access means connected to said data base and said local exchanges and responsive to signals including a subscriber identification numberfrom one of said local exchanges for retrieving feature data associated with said subscriber identification number and transmitting said retrieved data to said one local exchange;
processor means in said one local exchange responsive to a predetermined code received from one of said telephone terminals to control the transmission of said signals to said data base access means and to provide call handling service defined by said transmitted feature data.
a plurality of local exchanges having telephone terminals connected thereto;
a data base system for storing data defining telephone features in association with identification numbers;
data base access means connected to said data base and said local exchanges and responsive to signals including a subscriber identification numberfrom one of said local exchanges for retrieving feature data associated with said subscriber identification number and transmitting said retrieved data to said one local exchange;
processor means in said one local exchange responsive to a predetermined code received from one of said telephone terminals to control the transmission of said signals to said data base access means and to provide call handling service defined by said transmitted feature data.
13. The telecommunication system in accordance with claim 12 wherein said one local exchange comprises memory means for storing said feature data transmitted by said data base access means and said processor means is responsive to a request for service other than said predetermined code to provide call handling service defined by said feature data stored in said memory.
14. The telecommunication system in accordance with claim 13 wherein said one local exchange further comprises clock means for generating timing signals and said processor means is responsive to signals defining a timeperiod received from said one of said terminals and said timing signals to provide call handling service defined by said feature data stored in said memory only for the period of time defined by said signals defining a period of time.
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JPS601959A (en) * | 1983-06-17 | 1985-01-08 | Nec Corp | Portable type abbreviated dial system |
US4567323A (en) * | 1983-07-12 | 1986-01-28 | At&T Bell Laboratories | Method and apparatus for providing a plurality of special services |
CA1222586A (en) * | 1983-11-11 | 1987-06-02 | Tadahiko Akiyama | Personal-servicing communication system |
JPS60103858A (en) * | 1983-11-11 | 1985-06-08 | Nippo Tsushin Kogyo Kk | Communication system whose service class is changed by user |
JPS60103859A (en) * | 1983-11-11 | 1985-06-08 | Nippo Tsushin Kogyo Kk | Individual service communication system |
JPS60180268A (en) * | 1984-02-27 | 1985-09-14 | Nippon Telegr & Teleph Corp <Ntt> | Remote connection control system |
JPS6198056A (en) * | 1984-10-19 | 1986-05-16 | Nippon Telegr & Teleph Corp <Ntt> | Information vending communication system |
JPS61171267A (en) * | 1985-01-25 | 1986-08-01 | Fujitsu Ltd | Exchange service control system by user |
JPS61179645A (en) * | 1985-02-04 | 1986-08-12 | Mitsubishi Electric Corp | Telephone set using card system abbreviated telephone number |
JPS61280148A (en) * | 1985-06-05 | 1986-12-10 | Hitachi Ltd | Telephone set using card |
US4752951A (en) * | 1985-12-23 | 1988-06-21 | Konneker Lloyd K | Method of providing location dependent person locator service |
-
1986
- 1986-11-28 US US07/935,812 patent/US4899373A/en not_active Expired - Lifetime
-
1987
- 1987-11-12 CA CA000551633A patent/CA1277791C/en not_active Expired - Lifetime
- 1987-11-23 GB GB8727421A patent/GB2198011B/en not_active Expired - Fee Related
- 1987-11-27 JP JP62297922A patent/JPS63151156A/en active Granted
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5442690A (en) | 1992-08-25 | 1995-08-15 | Bell Communications Research, Inc. | Telecommunication service record structure and method of execution |
US5455853A (en) | 1992-08-25 | 1995-10-03 | Bell Communications Research, Inc. | Method of creating a telecommunication service template |
US5463682A (en) | 1992-08-25 | 1995-10-31 | Bell Communications Research, Inc. | Method of creating user-defined call processing procedures |
US5481601A (en) | 1992-08-25 | 1996-01-02 | Bell Communications Research Inc. | System and method for creating, transfering, and monitoring services in a telecommunication system |
US5511116A (en) | 1992-08-25 | 1996-04-23 | Bell Communications Research Inc. | Method of creating and accessing value tables in a telecommunication service creation and execution environment |
US5608789A (en) | 1992-08-25 | 1997-03-04 | Bell Communications Research, Inc. | Method of creating user-defined call processing procedures |
Also Published As
Publication number | Publication date |
---|---|
GB2198011B (en) | 1990-10-31 |
JPH0379907B2 (en) | 1991-12-20 |
GB2198011A (en) | 1988-06-02 |
JPS63151156A (en) | 1988-06-23 |
GB8727421D0 (en) | 1987-12-23 |
US4899373A (en) | 1990-02-06 |
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Legal Events
Date | Code | Title | Description |
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MKEX | Expiry |