CA2294843A1 - Telephone with ringing signal suppression for certain callers - Google Patents
Telephone with ringing signal suppression for certain callers Download PDFInfo
- Publication number
- CA2294843A1 CA2294843A1 CA002294843A CA2294843A CA2294843A1 CA 2294843 A1 CA2294843 A1 CA 2294843A1 CA 002294843 A CA002294843 A CA 002294843A CA 2294843 A CA2294843 A CA 2294843A CA 2294843 A1 CA2294843 A1 CA 2294843A1
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- CA
- Canada
- Prior art keywords
- telephone
- ring
- message
- burst
- central office
- 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.)
- Abandoned
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/663—Preventing unauthorised calls to a telephone set
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/57—Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set
Abstract
A telephone apparatus for screening calls on the basis of messages containing message data, the messages being transmitted by a central office before a first ring burst is transmitted by the central office. The apparatus includes a messager receiver, a decoder, a ringer and a ringer controller. The message receiver is in communication with the central office line and is operable to receive a message while the telephone is on-hook. The decoder decodes the message to extract the message data from the message. The ringer is operable to sound an audible alarm when a telephone call is received and the ringer controller prevents the ringer from sounding in response to the first ring burst, when the message data satisfies a pre-defined condition.
Description
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, . , , , ~ , , , , -, , , , ~ , > o ~, > ~ s , v ~ ' . , . o ~ v s TELEPHONE WITH RINGING SIGNAL SUPPRESSION FOR CERTAIN
CALLERS
BACKGROUND OF THE INVENTION
This invention relates to the use of calling line identification information messages to control a ringer in a telephone.
In conventional subscriber telephone equipment, 0 culling line identification information is transmitted to the subscriber after a second ring burst. Ccnsequentlv_r, if the subscriber desires to know who is calling, the subscriber must not answer the call until after a first ring burst. Even if the subscriber has blocked certain calls based on calling line ID, the subscriber must stil_1_ hear the first ring. This can be ar_nc~ring to the subscriber. The present invention addresses this problem.
SUMMARY OF THE INVENTION
c0 In accordance with one aspect of the invention, there is provided a telephone apparatus for screening calls on the basis of messages containing Calling Line Identification (CLID) information transmitted by a central cffice before a first ring burst of a telephone call is transmitted by the central office. The apparatus includes a message receiver, a decoder, a ringer and a ringer controller. The message receiver is at the telephone and is in communication with the central office, and is operable to receive a message while the telephone is on-hook and before the first ring burst of an associated telephone call. The decoder decodes the message to eatracr the CLID information from the message. The ringer is operable to sound an audible alarm in response to ring bursts produced by the central office when a telephone call is received and the ringer controller prevents the ringer from sounding in response to the first ring burst, ,'f',;.
~, ,., . , ~ , , a ~ ~ ", , n ~
. , ~ a ~" ~s in response to the CLID information satisf~ring a pre-defined condition.
Preferably, the apparatus inc l udes a di spl_ay,- fc,r displaying a representation of the CLID information.
Preferably, the pre-defined condition includes a match between the CLID information and pre-defined data.
Preferably, the apparatus includes a block out list of telephone numbers from which calls are not to be accepted, and preferably, the pre-defined data includes the telephone numbers in the block-out list.
The CLID information may include a name of a caller and the pre-defined data may include the name of a caller from whom a user of the apparatus does not want to receive a telephone call.
The CLID information may include a telephone number of a caller and the pre-defined data may include the telephone number of a caller from whom a user oz the apparatus does not want to receive a telephone call.
Preferably, when the CLID information matches the pre-defined data, the ringer controller prevents the ringer from responding to ring burst s,~gnals received from t=~e central office.
Preferably, the message receiver and the decoder ir_~clude a Frequency Shift Keying (FSK) receiver for receiving FSK signals from the central office, when the telephone is on-hook, or alternatively, whether or not the telephone is on-hook or off-hook.
Preferably, the apparatus includes an on-hook detector, for detecting whether or not the telephone is on-hook.
In accordance with another aspect of the invention, there is provided a method of screening telephone calls in response to a message including Calling Line Identification (CLID) information transmitted to a telephone by a central office before a first ring burst of a telephone call is transmitted to the telephone, the method comprising:
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_ __ , 1 v o 7 , p p . n v ~ , e7~. ., 7 ~' n > 1 a) receiving the message at a message receiver at the telephone in communication with the central office before the first rina burst of an associated telex-hone call;
b) decoding the message to extract the CLID
information from the message before the first ring burst; and c) preventing a ringer responsive to ring bursts produced by the cer~tral office and controlled b~~
the telephone, from sounding i n response to the first ring burst, in response to the CLID
information satisfying a pre-defined condition.
In accordance with ar_other aspect of the invention, there is provided a method of providing pre-ying identification of a calling party of a telephone call on a telephone line, the method comprising:
a) transmitting on the telephone lire a pre-ring message including the ider_tification of the calling party, before any ring bursts associated with the telephone call are transmitted; and b) transmitting on the telephone line a first ring burst associated with the telephone call, after the pre-ring message has been transmitted.
Preferably, transmitting a first ring burst includes providing a pre-ring silence period before transmitting the first ring burst. The method preferabl,r further includes transmitting on the telephone line a pre-ying channel seizure burst and transmitting on the telephone line a mark burst after transmitting the pre-ying channel seizure burst and prior to transmitting the pre-ring message.
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.. ,, -3a-BRIEF DESCRIPTION OF THE DRAWINGS
Tn drawlnG'S WhlCh ~.ll!L:St-~'ct2 embCd~iT,C'_:tS n~ trio '_::-Jc='a ~ On Figure 1 is a block diagram of an apparatus according to a first embodiment of the invention;
Figure 2 is a timing diagram of signal received on a central office line; and Figure 3 is a flowchart of a message response ~:laorithm according to the first embodiment of the invention.
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, . , , , ~ , , , , -, , , , ~ , > o ~, > ~ s , v ~ ' . , . o ~ v s TELEPHONE WITH RINGING SIGNAL SUPPRESSION FOR CERTAIN
CALLERS
BACKGROUND OF THE INVENTION
This invention relates to the use of calling line identification information messages to control a ringer in a telephone.
In conventional subscriber telephone equipment, 0 culling line identification information is transmitted to the subscriber after a second ring burst. Ccnsequentlv_r, if the subscriber desires to know who is calling, the subscriber must not answer the call until after a first ring burst. Even if the subscriber has blocked certain calls based on calling line ID, the subscriber must stil_1_ hear the first ring. This can be ar_nc~ring to the subscriber. The present invention addresses this problem.
SUMMARY OF THE INVENTION
c0 In accordance with one aspect of the invention, there is provided a telephone apparatus for screening calls on the basis of messages containing Calling Line Identification (CLID) information transmitted by a central cffice before a first ring burst of a telephone call is transmitted by the central office. The apparatus includes a message receiver, a decoder, a ringer and a ringer controller. The message receiver is at the telephone and is in communication with the central office, and is operable to receive a message while the telephone is on-hook and before the first ring burst of an associated telephone call. The decoder decodes the message to eatracr the CLID information from the message. The ringer is operable to sound an audible alarm in response to ring bursts produced by the central office when a telephone call is received and the ringer controller prevents the ringer from sounding in response to the first ring burst, ,'f',;.
~, ,., . , ~ , , a ~ ~ ", , n ~
. , ~ a ~" ~s in response to the CLID information satisf~ring a pre-defined condition.
Preferably, the apparatus inc l udes a di spl_ay,- fc,r displaying a representation of the CLID information.
Preferably, the pre-defined condition includes a match between the CLID information and pre-defined data.
Preferably, the apparatus includes a block out list of telephone numbers from which calls are not to be accepted, and preferably, the pre-defined data includes the telephone numbers in the block-out list.
The CLID information may include a name of a caller and the pre-defined data may include the name of a caller from whom a user of the apparatus does not want to receive a telephone call.
The CLID information may include a telephone number of a caller and the pre-defined data may include the telephone number of a caller from whom a user oz the apparatus does not want to receive a telephone call.
Preferably, when the CLID information matches the pre-defined data, the ringer controller prevents the ringer from responding to ring burst s,~gnals received from t=~e central office.
Preferably, the message receiver and the decoder ir_~clude a Frequency Shift Keying (FSK) receiver for receiving FSK signals from the central office, when the telephone is on-hook, or alternatively, whether or not the telephone is on-hook or off-hook.
Preferably, the apparatus includes an on-hook detector, for detecting whether or not the telephone is on-hook.
In accordance with another aspect of the invention, there is provided a method of screening telephone calls in response to a message including Calling Line Identification (CLID) information transmitted to a telephone by a central office before a first ring burst of a telephone call is transmitted to the telephone, the method comprising:
., ~/
_ __ , 1 v o 7 , p p . n v ~ , e7~. ., 7 ~' n > 1 a) receiving the message at a message receiver at the telephone in communication with the central office before the first rina burst of an associated telex-hone call;
b) decoding the message to extract the CLID
information from the message before the first ring burst; and c) preventing a ringer responsive to ring bursts produced by the cer~tral office and controlled b~~
the telephone, from sounding i n response to the first ring burst, in response to the CLID
information satisfying a pre-defined condition.
In accordance with ar_other aspect of the invention, there is provided a method of providing pre-ying identification of a calling party of a telephone call on a telephone line, the method comprising:
a) transmitting on the telephone lire a pre-ring message including the ider_tification of the calling party, before any ring bursts associated with the telephone call are transmitted; and b) transmitting on the telephone line a first ring burst associated with the telephone call, after the pre-ring message has been transmitted.
Preferably, transmitting a first ring burst includes providing a pre-ring silence period before transmitting the first ring burst. The method preferabl,r further includes transmitting on the telephone line a pre-ying channel seizure burst and transmitting on the telephone line a mark burst after transmitting the pre-ying channel seizure burst and prior to transmitting the pre-ring message.
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.. ,, -3a-BRIEF DESCRIPTION OF THE DRAWINGS
Tn drawlnG'S WhlCh ~.ll!L:St-~'ct2 embCd~iT,C'_:tS n~ trio '_::-Jc='a ~ On Figure 1 is a block diagram of an apparatus according to a first embodiment of the invention;
Figure 2 is a timing diagram of signal received on a central office line; and Figure 3 is a flowchart of a message response ~:laorithm according to the first embodiment of the invention.
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DETAILED DESCRIPTION
Referring to Figure 1, an apparatus according to a first embodiment of the invention is shown generally at 10. The apparatus is part of a telephone, not shown, and includes a microprocessor circuit including a microprocessor 12, an input/output (I/O) port 14, a liquid crystal display (LCD) 16, a frequency shift keying (FSK) receiver 18, an on-hook detector 20, a ringer 22 for sounding an audible alarm when a telephone call is received, a ring detector 24 and random access memory (RAM) 26 and read only memory (ROM) 28. The apparatus acts to screen messages containing message data, where the messages are transmitted by a central office before a first ring burst is received at the telephone.
In this embodiment, the microprocessor is a Motorola MC68HC705LN56 and has conventional address and data busses which enable the microprocessor 12 to communicate with the I/O port and the microprocessor RAM
and ROM 26 and 28. The microprocessor 12 also has first and second interrupt inputs 30 and 32 for receiving a message signal from the FSK receiver 18 and for receiving a ring detect signal from the ring detector 24 respectively. The FSK receiver 18 is operable to provide to the microprocessor I2 via the I/O port 14 digital message data representing FSK messages it receives from a receive signal path 34 in the telephone. In this embodiment, the FSK receiver receives signals from the receive signal path 34 independently of whether or not the telephone is on-hook or off-hook. In other words, the FSK
receiver 18 is always in communication with a central office line 36 connecting the telephone to a central office, independently of whether or not the telephone is on-hook or off-hook. The FSK receiver thus acts as a message receiver in communication with the central office line, the message receiver receiving a message while the telephone is on-hook or off-hook. In addition, the FSK
_5_ receiver acts as a decoder for decoding the message to extract message data from the FSK message.
The ring detector 24 is also connected to the receive signal path to receive ring signals therefrom, again, independently of whether or not the telephone is on hook or off-hook.
The on-hook detector 20 includes conventional circuitry for determining whether or not the telephone is on-hook or off-hook, such circuitry having an output 38 operable to provide to the microprocessor 12, via the I/O
port 14, an on-hook signal which is rendered active when the telephone is on-hook.
The ROM 28 is programmed with codes representing instructions which direct the microprocessor 12 to perform various functions including functions implementing a message response algorithm.
The message response algorithm includes instructions which configure the RAM 26 to include an on-hook transition flag buffer 40, a message data buffer 42, a display buffer 44 and a block out list buffer 46. The on-hook transition flag buffer 40 is used to store a code indicating whether or not there has been a transition from the off-hook state to the on-hook state at the telephone as determined by reading the I/0 port 14 for the status of the on-hook signal. Thus the on-hook transition flag buffer is used to indicate whether the telephone has just gone on-hook.
The message data buffer 42 is used to store message data contained in message signals received from the receive signal path 34, as detected by the FSK receiver 18.
The display buffer 44 is used to hold data to be displayed on the LCD 16.
The block out list buffer 46 is used to store a list of telephone numbers from which telephone calls are not to be received. The user may program telephone numbers into this list by entering such numbers on a user input device such as a keypad (not shown) or by receiving and storing telephone numbers from calling line identification (CLID) information received from the central office. In addition, the telephone number of a current caller may be added to the list in a manner similar to that in which telephone numbers are added to a personal directory in a telephone. The telephone numbers act as pre-defined data in the block out list.
Referring to Figure 2, it will be appreciated that with conventional telephone technology, to signal a subscriber telephone, the central office transmits an approximately 2-secor~d ring burst 50 on the central office line. If calling line identification information is to be sent to the subscriber telephone, the central office follows the ring burst 50 with a channel seizure burst 52 and a mark burst 54, followed by an FSK message 56 encoded in an FSK format, followed by a silence period 58. The time taken for the channel seizure burst 52, the mark burst 54 and the FSK message 56 is about 0.5 seconds, while the silence period is about 3.5 seconds. Following the silence period, the above pattern is repeated, without the FSK
message 56.
To use the present invention, the central office transmits a pre-ring channel seizure burst 60, the mark burst 62 and pre-ring FSK message 64 followed by a pre-ring silence period 66, before the first ring burst 50 is transmitted. Using this signaling format, the message response algorithm directs the microprocessor to respond as described below.
Operation Referring to Figure 3, the message response algorithm is shown generally at 70. It will be appreciated that the microprocessor 12 shown in Figure 1, runs other conventional programs stored in ROM 28, for performing various other functions of a conventional telephone. ~ One of such programs is a main algorithm (not shown) which calls various other algorithms associated with specific functionality. The message response algorithm is also called at periodic intervals, in this embodiment, about 4 seconds.
Referring to Figures 1 and 3, the message response algorithm begins with block 72 which directs the microprocessor 12 to read the contents of the on-hook transition flag buffer 40 to determine whether or not the telephone has been taken from an off-hook state to an on-hook state. If the telephone has not undergone this transition, the user is considered to be using the telephone and use of the invention is unnecessary.
However, if the user has placed the telephone on-hook, block 74 of the message response algorithm directs the microprocessor 12 to determine the status of the FSK
receive interrupt input 30. If the status of this input indicates that an interrupt has not been received, it is assumed that no FSK data has been received and the message response algorithm is ended.
If the FSK receive interrupt input 30 indicates that an interrupt has been received, block 76 directs the microprocessor 12 to download message data from the FSK
receiver 18 into the message data buffer 42 in RAM 26.
Block 78 then directs the microprocessor 12 to calculate a cyclic redundancy check (CRC) value and compare it with a corresponding value transmitted with the message. If the CRC values are not equal, the message is assumed to be invalid and the message response algorithm is ended.
However, if the CRC values are equal, the message is assumed to be valid and block 80 directs the microprocessor 12 to load a data portion of the FSK message data into the display buffer 44. A separate, conventional display routine (not shown) causes the contents of the display buffer to be displayed by the LCD 16. The LCD thus acts as a display in communication with the processor, for displaying a representation of the message data.
Block 82 then directs the microprocessor 12 to compare a telephone number portion of the message data with the telephone numbers stored in the block out list buffer _g_ 46. If none is equal, block 84 directs the microprocessor to enable the ringer and end the message response algorithm. Subsequent ring bursts received on the central office line will then be sounded by the ringer 22.
If the telephone number portion of the message data matches any of the telephone numbers stored in the block out list buffer 46, block 84 directs the microprocessor 12 to disable the ringer 22 and end the message response algorithm. Subsequent ring bursts, including the first ring burst, received on the central office line will then not be sounded by the ringer 22.
The microprocessor thus acts as a ringer controller for preventing the ringer from sounding in response to the first ring burst when the message data matches a pre-defined condition. The microprocessor also prevents the ringer from sounding in response to subsequent ring bursts occurring after the first ring burst, until the calling party terminates the call. It will also be appreciated that processor is programmed to enable the display to display a representation of the message data, while preventing the ringer from sounding when the message data satisfies a pre-defined condition. The pre-defined condition includes a match between the message data and pre-defined data, where the pre-defined data includes telephone numbers in the block out list.
By receiving an FSK message prior to the first ring burst, the ringer 22 can be disabled where the FSK
data matches an entry in a block out list. Thus, the user need not hear the first ring burst or any ring bursts if the calling telephone number is on the block out list.
Alternatively, the block out list may include names of callers from whom calls are not to be received and the message data includes the name of the caller.
It is also possible to use the present invention to receive and display data, without enabling the ringer to sound, thereby providing a way of sending advertising or other information to a subscriber's telephone. In this _g_ scenario, the message may include an identification code to which the microprocessor responds by disabling the ringer and displaying a data portion of the message on the display. To sound the ringer for conventional telephone operation, a ring message may be transmitted prior to the first ring burst to inform the telephone that a ring cadence is about to be transmitted.
In an alternative embodiment, the pre-ring channel seizure burst 60 may be replaced with a pre-ring CAS tone, in which case, the telephone would include an on hook CAS detector circuit 86 connected to the I/O port 14 as shown in Figure 1, for providing an active signal in response to receipt of a pre-ring CAS tone. The microprocessor would include a routine which directs the microprocessor to the message response algorithm shown in Figure 3, in response to successful receipt of a pre-ring CAS tone.
The invention enables a user to be informed of the identity of a caller before the telephone begins to ring. It also enables the telephone to block out telephone calls from particular telephone stations, at the discretion of the user. Thus, the user can be informed of only those calls which he/she has authorized for reception and the user will not be bothered by telephone ringing associated with calls from unauthorized parties.
While specific embodiments of the invention have been described and illustrated, such embodiments should be considered illustrative of the invention only and not as limiting the invention as construed in accordance with the accompanying claims.
Referring to Figure 1, an apparatus according to a first embodiment of the invention is shown generally at 10. The apparatus is part of a telephone, not shown, and includes a microprocessor circuit including a microprocessor 12, an input/output (I/O) port 14, a liquid crystal display (LCD) 16, a frequency shift keying (FSK) receiver 18, an on-hook detector 20, a ringer 22 for sounding an audible alarm when a telephone call is received, a ring detector 24 and random access memory (RAM) 26 and read only memory (ROM) 28. The apparatus acts to screen messages containing message data, where the messages are transmitted by a central office before a first ring burst is received at the telephone.
In this embodiment, the microprocessor is a Motorola MC68HC705LN56 and has conventional address and data busses which enable the microprocessor 12 to communicate with the I/O port and the microprocessor RAM
and ROM 26 and 28. The microprocessor 12 also has first and second interrupt inputs 30 and 32 for receiving a message signal from the FSK receiver 18 and for receiving a ring detect signal from the ring detector 24 respectively. The FSK receiver 18 is operable to provide to the microprocessor I2 via the I/O port 14 digital message data representing FSK messages it receives from a receive signal path 34 in the telephone. In this embodiment, the FSK receiver receives signals from the receive signal path 34 independently of whether or not the telephone is on-hook or off-hook. In other words, the FSK
receiver 18 is always in communication with a central office line 36 connecting the telephone to a central office, independently of whether or not the telephone is on-hook or off-hook. The FSK receiver thus acts as a message receiver in communication with the central office line, the message receiver receiving a message while the telephone is on-hook or off-hook. In addition, the FSK
_5_ receiver acts as a decoder for decoding the message to extract message data from the FSK message.
The ring detector 24 is also connected to the receive signal path to receive ring signals therefrom, again, independently of whether or not the telephone is on hook or off-hook.
The on-hook detector 20 includes conventional circuitry for determining whether or not the telephone is on-hook or off-hook, such circuitry having an output 38 operable to provide to the microprocessor 12, via the I/O
port 14, an on-hook signal which is rendered active when the telephone is on-hook.
The ROM 28 is programmed with codes representing instructions which direct the microprocessor 12 to perform various functions including functions implementing a message response algorithm.
The message response algorithm includes instructions which configure the RAM 26 to include an on-hook transition flag buffer 40, a message data buffer 42, a display buffer 44 and a block out list buffer 46. The on-hook transition flag buffer 40 is used to store a code indicating whether or not there has been a transition from the off-hook state to the on-hook state at the telephone as determined by reading the I/0 port 14 for the status of the on-hook signal. Thus the on-hook transition flag buffer is used to indicate whether the telephone has just gone on-hook.
The message data buffer 42 is used to store message data contained in message signals received from the receive signal path 34, as detected by the FSK receiver 18.
The display buffer 44 is used to hold data to be displayed on the LCD 16.
The block out list buffer 46 is used to store a list of telephone numbers from which telephone calls are not to be received. The user may program telephone numbers into this list by entering such numbers on a user input device such as a keypad (not shown) or by receiving and storing telephone numbers from calling line identification (CLID) information received from the central office. In addition, the telephone number of a current caller may be added to the list in a manner similar to that in which telephone numbers are added to a personal directory in a telephone. The telephone numbers act as pre-defined data in the block out list.
Referring to Figure 2, it will be appreciated that with conventional telephone technology, to signal a subscriber telephone, the central office transmits an approximately 2-secor~d ring burst 50 on the central office line. If calling line identification information is to be sent to the subscriber telephone, the central office follows the ring burst 50 with a channel seizure burst 52 and a mark burst 54, followed by an FSK message 56 encoded in an FSK format, followed by a silence period 58. The time taken for the channel seizure burst 52, the mark burst 54 and the FSK message 56 is about 0.5 seconds, while the silence period is about 3.5 seconds. Following the silence period, the above pattern is repeated, without the FSK
message 56.
To use the present invention, the central office transmits a pre-ring channel seizure burst 60, the mark burst 62 and pre-ring FSK message 64 followed by a pre-ring silence period 66, before the first ring burst 50 is transmitted. Using this signaling format, the message response algorithm directs the microprocessor to respond as described below.
Operation Referring to Figure 3, the message response algorithm is shown generally at 70. It will be appreciated that the microprocessor 12 shown in Figure 1, runs other conventional programs stored in ROM 28, for performing various other functions of a conventional telephone. ~ One of such programs is a main algorithm (not shown) which calls various other algorithms associated with specific functionality. The message response algorithm is also called at periodic intervals, in this embodiment, about 4 seconds.
Referring to Figures 1 and 3, the message response algorithm begins with block 72 which directs the microprocessor 12 to read the contents of the on-hook transition flag buffer 40 to determine whether or not the telephone has been taken from an off-hook state to an on-hook state. If the telephone has not undergone this transition, the user is considered to be using the telephone and use of the invention is unnecessary.
However, if the user has placed the telephone on-hook, block 74 of the message response algorithm directs the microprocessor 12 to determine the status of the FSK
receive interrupt input 30. If the status of this input indicates that an interrupt has not been received, it is assumed that no FSK data has been received and the message response algorithm is ended.
If the FSK receive interrupt input 30 indicates that an interrupt has been received, block 76 directs the microprocessor 12 to download message data from the FSK
receiver 18 into the message data buffer 42 in RAM 26.
Block 78 then directs the microprocessor 12 to calculate a cyclic redundancy check (CRC) value and compare it with a corresponding value transmitted with the message. If the CRC values are not equal, the message is assumed to be invalid and the message response algorithm is ended.
However, if the CRC values are equal, the message is assumed to be valid and block 80 directs the microprocessor 12 to load a data portion of the FSK message data into the display buffer 44. A separate, conventional display routine (not shown) causes the contents of the display buffer to be displayed by the LCD 16. The LCD thus acts as a display in communication with the processor, for displaying a representation of the message data.
Block 82 then directs the microprocessor 12 to compare a telephone number portion of the message data with the telephone numbers stored in the block out list buffer _g_ 46. If none is equal, block 84 directs the microprocessor to enable the ringer and end the message response algorithm. Subsequent ring bursts received on the central office line will then be sounded by the ringer 22.
If the telephone number portion of the message data matches any of the telephone numbers stored in the block out list buffer 46, block 84 directs the microprocessor 12 to disable the ringer 22 and end the message response algorithm. Subsequent ring bursts, including the first ring burst, received on the central office line will then not be sounded by the ringer 22.
The microprocessor thus acts as a ringer controller for preventing the ringer from sounding in response to the first ring burst when the message data matches a pre-defined condition. The microprocessor also prevents the ringer from sounding in response to subsequent ring bursts occurring after the first ring burst, until the calling party terminates the call. It will also be appreciated that processor is programmed to enable the display to display a representation of the message data, while preventing the ringer from sounding when the message data satisfies a pre-defined condition. The pre-defined condition includes a match between the message data and pre-defined data, where the pre-defined data includes telephone numbers in the block out list.
By receiving an FSK message prior to the first ring burst, the ringer 22 can be disabled where the FSK
data matches an entry in a block out list. Thus, the user need not hear the first ring burst or any ring bursts if the calling telephone number is on the block out list.
Alternatively, the block out list may include names of callers from whom calls are not to be received and the message data includes the name of the caller.
It is also possible to use the present invention to receive and display data, without enabling the ringer to sound, thereby providing a way of sending advertising or other information to a subscriber's telephone. In this _g_ scenario, the message may include an identification code to which the microprocessor responds by disabling the ringer and displaying a data portion of the message on the display. To sound the ringer for conventional telephone operation, a ring message may be transmitted prior to the first ring burst to inform the telephone that a ring cadence is about to be transmitted.
In an alternative embodiment, the pre-ring channel seizure burst 60 may be replaced with a pre-ring CAS tone, in which case, the telephone would include an on hook CAS detector circuit 86 connected to the I/O port 14 as shown in Figure 1, for providing an active signal in response to receipt of a pre-ring CAS tone. The microprocessor would include a routine which directs the microprocessor to the message response algorithm shown in Figure 3, in response to successful receipt of a pre-ring CAS tone.
The invention enables a user to be informed of the identity of a caller before the telephone begins to ring. It also enables the telephone to block out telephone calls from particular telephone stations, at the discretion of the user. Thus, the user can be informed of only those calls which he/she has authorized for reception and the user will not be bothered by telephone ringing associated with calls from unauthorized parties.
While specific embodiments of the invention have been described and illustrated, such embodiments should be considered illustrative of the invention only and not as limiting the invention as construed in accordance with the accompanying claims.
Claims (16)
1. A method of screening telephone calls in response to a message including Calling Line Identification (CLID) information transmitted to a telephone by a central office before a first ring burst of a telephone call is transmitted to said telephone, the method comprising:
a) receiving said message at a message receiver at said telephone in communicaticn with said central office before said first ring burst of an associated telephone call;
b) decoding said message to extract said CLID
information from said message before said first ring burst; and c) preventing a ringer responsive to ring bursts produced by said central office and controlled by said telephone, from sounding in response to said first ring burst, in response to said CLID
information satisfying a pre-defined condition.
a) receiving said message at a message receiver at said telephone in communicaticn with said central office before said first ring burst of an associated telephone call;
b) decoding said message to extract said CLID
information from said message before said first ring burst; and c) preventing a ringer responsive to ring bursts produced by said central office and controlled by said telephone, from sounding in response to said first ring burst, in response to said CLID
information satisfying a pre-defined condition.
2. A method as claimed in claim 1 further including displaying a representation of said CLID
information.
information.
3. A method as claimed in claim 1 further including preventing said ringer from responding to ring burst signals received from the central office when said CLID information matches pre-defined data.
4. A telephone apparatus for screening calls on the basis of messages containing Calling Line Identification (CLID) information, transmitted by a central office before a first ring burst of a telephone call is transmitted by said central office, the apparatus comprising:
a message receiver at said telephone and in communication with said central office, said message receiver being operable to receive a message while said telephone is on-hook and before said first ring burst of an associated telephone call;
b) a decoder for decoding said message to extract said CLID information from said message;
c) a ringer for sounding an audible alarm in response to ring bursts produced by said central office when a telephone call is received; and d) a ringer controller for preventing said ringer from sounding in response to said first ring burst, in response to said CLID information satisfying a pre-defined condition.
a message receiver at said telephone and in communication with said central office, said message receiver being operable to receive a message while said telephone is on-hook and before said first ring burst of an associated telephone call;
b) a decoder for decoding said message to extract said CLID information from said message;
c) a ringer for sounding an audible alarm in response to ring bursts produced by said central office when a telephone call is received; and d) a ringer controller for preventing said ringer from sounding in response to said first ring burst, in response to said CLID information satisfying a pre-defined condition.
5. An apparatus as claimed in claim 4 further including a display for displaying a representation of said CLID information.
6. An apparatus as claimed in claim 4 wherein said pre-defined condition includes a match between the CLID
information and pre-defined data.
information and pre-defined data.
7. An apparatus as claimed in claim 6 further including a block out list cf telephone numbers from which calls are not to be accepted, and wherein said pre-defined data includes said telephone numbers in said block-out list.
8. An apparatus as claimed in claim 6 wherein said CLID
information includes a name of a caller and said pre-defined data includes the name of a caller from whom a user of the apparatus does not want to receive a telephone call.
information includes a name of a caller and said pre-defined data includes the name of a caller from whom a user of the apparatus does not want to receive a telephone call.
9. An apparatus as claimed in claim 6 wherein said CLID
information includes a telephone number of a caller and said pre-defined data includes the telephone number of a caller from whom a user of the apparatus does not want to receive a telephone call.
information includes a telephone number of a caller and said pre-defined data includes the telephone number of a caller from whom a user of the apparatus does not want to receive a telephone call.
10. An apparatus as claimed in claim 6 wherein said ringer controller prevents said ringer from responding to ring burst signals received from the central office when the CLID information matches the pre-defined data.
11. An apparatus as claimed in claim 4 wherein said message receiver and said decoder include a frequency shift keying (FSK) receiver for receiving FSK signals from the central office, whether or not said telephone is on-hook or off-hook.
12. An apparatus as claimed in claim 4 wherein said message receiver and said decoder include a frequency shift keying (FSK) receiver for receiving FSK signals from the central office, when said telephone is on-hook.
13. An apparatus as claimed in claim 12 further including an on-hook detector, for detecting whether or not said telephone is on-hook.
14. A method of providing pre-ring identification of a calling party of a telephone call on a telephone line, the method comprising:
a) transmitting on said telephone line a pre-ring message including said identification of said calling party, before any ring bursts associated with said telephone call are transmitted; and b) transmitting on said telephone line a first ring burst associated with said telephone call, after said pre-ring message has been transmitted.
a) transmitting on said telephone line a pre-ring message including said identification of said calling party, before any ring bursts associated with said telephone call are transmitted; and b) transmitting on said telephone line a first ring burst associated with said telephone call, after said pre-ring message has been transmitted.
15. A method as claimed in claim 14 wherein transmitting a first ring burst includes providing a pre-ring silence period before transmitting said first ring burst.
16. A method as claimed in claim 15 further including:
a) transmitting on said telephone line a pre-ring channel seizure burst; and b) transmitting on said telephone line a mark burst after transmitting said pre-ring channel seizure burst and prior to transmitting said pre-ring message.
a) transmitting on said telephone line a pre-ring channel seizure burst; and b) transmitting on said telephone line a mark burst after transmitting said pre-ring channel seizure burst and prior to transmitting said pre-ring message.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/895,102 US6044148A (en) | 1997-07-16 | 1997-07-16 | Pre-ring caller identification apparatus and method and call screening therefrom |
| US08/895,102 | 1997-07-16 | ||
| PCT/CA1998/000222 WO1999004544A1 (en) | 1997-07-16 | 1998-03-12 | Telephone with ringing signal suppression for certain callers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2294843A1 true CA2294843A1 (en) | 1999-01-28 |
Family
ID=25403982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002294843A Abandoned CA2294843A1 (en) | 1997-07-16 | 1998-03-12 | Telephone with ringing signal suppression for certain callers |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US6044148A (en) |
| EP (1) | EP0997024B1 (en) |
| JP (1) | JP2001510961A (en) |
| CA (1) | CA2294843A1 (en) |
| DE (1) | DE69821490T2 (en) |
| WO (1) | WO1999004544A1 (en) |
Families Citing this family (66)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020082043A1 (en) * | 1994-05-19 | 2002-06-27 | Kari-Pekka Wilska | Device for personal communications, data collection and data processing, and a circuit card |
| US7194083B1 (en) | 2002-07-15 | 2007-03-20 | Bellsouth Intellectual Property Corporation | System and method for interfacing plain old telephone system (POTS) devices with cellular networks |
| US20080207202A1 (en) * | 1997-07-30 | 2008-08-28 | Zellner Samuel N | Apparatus and method for providing a user interface for facilitating communications between devices |
| US20080194251A1 (en) * | 1997-07-30 | 2008-08-14 | Steven Tischer | Apparatus and method for providing communications and connection-oriented services to devices |
| US20080195641A1 (en) * | 1997-07-30 | 2008-08-14 | Steven Tischer | Apparatus and method for aggregating and accessing data according to user information |
| US20080207197A1 (en) * | 1997-07-30 | 2008-08-28 | Steven Tischer | Apparatus, method, and computer-readable medium for interfacing devices with communications networks |
| US20080220776A1 (en) * | 1997-07-30 | 2008-09-11 | Steven Tischer | Interface devices for facilitating communications between devices and communications networks |
| US7149514B1 (en) | 1997-07-30 | 2006-12-12 | Bellsouth Intellectual Property Corp. | Cellular docking station |
| US6253075B1 (en) * | 1998-05-19 | 2001-06-26 | Nokia Mobile Phones Ltd. | Method and apparatus for incoming call rejection |
| WO2000014942A1 (en) * | 1998-09-09 | 2000-03-16 | Telcordia Technologies, Inc. | Method, apparatus and system for filtering incoming telephone calls |
| US6198812B1 (en) * | 1998-09-23 | 2001-03-06 | Effectrol Patent Trust | Incoming telephone call filter utilizing a duplicitous caller-ID recognition method and apparatus |
| US7162027B1 (en) * | 1998-11-12 | 2007-01-09 | Agere Systems Inc. | Voice messaging system caller ring bypass control |
| US6700957B2 (en) | 1998-12-07 | 2004-03-02 | Curio, Ltd. | Caller ID system with retransmitted caller ID information |
| US6411802B1 (en) * | 1999-03-15 | 2002-06-25 | Bellsouth Intellectual Property Management Corporation | Wireless backup telephone device |
| US6728354B1 (en) * | 1999-03-17 | 2004-04-27 | Agere Systems, Inc. | Methods and devices for outputting audio announcements using CID related and other reference parameters |
| US7174007B1 (en) * | 2000-04-19 | 2007-02-06 | Agere Systems Inc. | Method and apparatus providing caller identification telephone service with a real time audio message |
| US7388949B2 (en) * | 2000-12-28 | 2008-06-17 | At&T Delaware Intellectual Property, Inc. | System and method for audio caller identification service |
| US20040233892A1 (en) * | 2001-05-16 | 2004-11-25 | Roberts Linda Ann | Priority caller alert |
| US6801608B2 (en) * | 2001-05-31 | 2004-10-05 | Hsin Wu Lee | Telephone incoming signal discriminator |
| US7085358B2 (en) * | 2001-06-25 | 2006-08-01 | Bellsouth Intellectual Property Corporation | Visual caller identification |
| US7012999B2 (en) * | 2001-06-25 | 2006-03-14 | Bellsouth Intellectual Property Corporation | Audio caller identification |
| US7315614B2 (en) | 2001-08-14 | 2008-01-01 | At&T Delaware Intellectual Property, Inc. | Remote notification of communications |
| US7269249B2 (en) * | 2001-09-28 | 2007-09-11 | At&T Bls Intellectual Property, Inc. | Systems and methods for providing user profile information in conjunction with an enhanced caller information system |
| US7079837B1 (en) * | 2001-11-06 | 2006-07-18 | Bellsouth Intellectual Property Corporation | Caller identification queue for wireless telephones |
| US6707895B2 (en) | 2001-11-20 | 2004-03-16 | Royal Appliance Mfg. Co. | Telephone line management system |
| US7120454B1 (en) | 2001-12-26 | 2006-10-10 | Bellsouth Intellectual Property Corp. | Auto sensing home base station for mobile telephone with remote answering capabilites |
| US7315618B1 (en) * | 2001-12-27 | 2008-01-01 | At&T Bls Intellectual Property, Inc. | Voice caller ID |
| US20040203675A1 (en) * | 2002-03-27 | 2004-10-14 | Reindle Mark E. | Method and apparatus for selectively sending a false system information tone on a telephone line |
| US6775364B2 (en) | 2002-03-27 | 2004-08-10 | Royal Appliance Mfg. Co. | Method and apparatus for selectively sending a false system information tone on a telephone line |
| US20050073999A1 (en) * | 2002-05-13 | 2005-04-07 | Bellsouth Intellectual Property Corporation | Delivery of profile-based third party content associated with an incoming communication |
| US8416804B2 (en) * | 2002-07-15 | 2013-04-09 | At&T Intellectual Property I, L.P. | Apparatus and method for providing a user interface for facilitating communications between devices |
| US8275371B2 (en) | 2002-07-15 | 2012-09-25 | At&T Intellectual Property I, L.P. | Apparatus and method for providing communications and connection-oriented services to devices |
| US8554187B2 (en) * | 2002-07-15 | 2013-10-08 | At&T Intellectual Property I, L.P. | Apparatus and method for routing communications between networks and devices |
| US8543098B2 (en) * | 2002-07-15 | 2013-09-24 | At&T Intellectual Property I, L.P. | Apparatus and method for securely providing communications between devices and networks |
| US8526466B2 (en) | 2002-07-15 | 2013-09-03 | At&T Intellectual Property I, L.P. | Apparatus and method for prioritizing communications between devices |
| US7200424B2 (en) * | 2002-07-15 | 2007-04-03 | Bellsouth Intelectual Property Corporation | Systems and methods for restricting the use and movement of telephony devices |
| US8000682B2 (en) * | 2002-07-15 | 2011-08-16 | At&T Intellectual Property I, L.P. | Apparatus and method for restricting access to data |
| US7127488B1 (en) | 2002-07-23 | 2006-10-24 | Bellsouth Intellectual Property Corp. | System and method for gathering information related to a geographical location of a caller in an internet-based communication system |
| US7139374B1 (en) | 2002-07-23 | 2006-11-21 | Bellsouth Intellectual Property Corp. | System and method for gathering information related to a geographical location of a callee in a public switched telephone network |
| US7623645B1 (en) * | 2002-07-23 | 2009-11-24 | At&T Intellectual Property, I, L.P. | System and method for gathering information related to a geographical location of a caller in a public switched telephone network |
| US6961413B2 (en) * | 2003-02-19 | 2005-11-01 | Sarakas Stephen T | Residential telephone system and method |
| US7280646B2 (en) * | 2003-04-18 | 2007-10-09 | At&T Bls Intellectual Property, Inc. | Dynamic Caller ID messaging |
| US7463727B2 (en) * | 2003-04-18 | 2008-12-09 | At&T International Property, I, L.P. | Caller ID messaging device |
| US7978833B2 (en) * | 2003-04-18 | 2011-07-12 | At&T Intellectual Property I, L.P. | Private caller ID messaging |
| US7283625B2 (en) * | 2003-04-18 | 2007-10-16 | At&T Bls Intellectual Property, Inc. | Caller ID messaging telecommunications services |
| US7443964B2 (en) * | 2003-04-18 | 2008-10-28 | At&T Intellectual Property, I,L.P. | Caller ID messaging |
| US7269412B2 (en) * | 2003-05-29 | 2007-09-11 | At&T Bls Intellectual Property, Inc. | Caller identification device and method of operation thereof |
| US7239693B2 (en) * | 2003-06-30 | 2007-07-03 | Bellsouth Intellectual Property Corporation | Network-based timed ring suppression |
| US7113586B2 (en) * | 2003-06-30 | 2006-09-26 | Edward Michael Silver | Caller controlled network-based timed ring suppression |
| US7443967B1 (en) | 2003-09-29 | 2008-10-28 | At&T Intellectual Property I, L.P. | Second communication during ring suppression |
| US7609832B2 (en) * | 2003-11-06 | 2009-10-27 | At&T Intellectual Property, I,L.P. | Real-time client survey systems and methods |
| US7623849B2 (en) | 2003-11-13 | 2009-11-24 | At&T Intellectual Property, I, L.P. | Method, system, and storage medium for providing comprehensive originator identification services |
| US7672444B2 (en) * | 2003-12-24 | 2010-03-02 | At&T Intellectual Property, I, L.P. | Client survey systems and methods using caller identification information |
| US20050152510A1 (en) * | 2004-01-09 | 2005-07-14 | Ladd Joseph W. | Auxiliary ringer and code screener |
| US6970546B2 (en) * | 2004-01-12 | 2005-11-29 | Bellsouth Intellecutal Property Corp. | Intelligent remote caller ID |
| US20060002540A1 (en) * | 2004-07-02 | 2006-01-05 | Barrett Kreiner | Real-time customer service representative workload management |
| US8195136B2 (en) * | 2004-07-15 | 2012-06-05 | At&T Intellectual Property I, L.P. | Methods of providing caller identification information and related registries and radiotelephone networks |
| US20060252417A1 (en) | 2005-05-05 | 2006-11-09 | Avaya Technology Corp. | Changing the user interface at a telecommunications terminal |
| US20070280454A1 (en) * | 2006-06-01 | 2007-12-06 | Avaya Technology Llc | Signaling a Telecommunications Terminal Through a Remote System |
| CN101321332B (en) * | 2007-06-08 | 2012-01-25 | 鹏智科技(深圳)有限公司 | Hand-hold communication appliance and its short message privacy method |
| US8160226B2 (en) | 2007-08-22 | 2012-04-17 | At&T Intellectual Property I, L.P. | Key word programmable caller ID |
| US8243909B2 (en) | 2007-08-22 | 2012-08-14 | At&T Intellectual Property I, L.P. | Programmable caller ID |
| US8660246B1 (en) * | 2009-04-06 | 2014-02-25 | Wendell Brown | Method and apparatus for content presentation in association with a telephone call |
| US9167082B2 (en) | 2013-09-22 | 2015-10-20 | Steven Wayne Goldstein | Methods and systems for voice augmented caller ID / ring tone alias |
| CN104702762A (en) * | 2015-03-13 | 2015-06-10 | 小米科技有限责任公司 | Incoming call reminding method and incoming call reminding device |
| US20230177519A1 (en) * | 2021-12-08 | 2023-06-08 | Avaya Management L.P. | Targeted selection and presentation of alerts |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4551581B1 (en) * | 1983-07-12 | 1995-06-20 | Bell Telephone Labor Inc | Method and apparatus for sending a data message to a selected station during a silent interval between ringing |
| US5029196A (en) * | 1988-07-11 | 1991-07-02 | Dytel Corporation | Automated call screening |
| JPH044647A (en) * | 1990-04-23 | 1992-01-09 | Mitsubishi Electric Corp | Isdn terminal equipment |
| US5228080A (en) * | 1990-06-25 | 1993-07-13 | Colonial Data Technologies Corp. | Method and apparatus for processing an incoming telephone call signal which may include a data message |
| US5553125A (en) * | 1991-01-11 | 1996-09-03 | Nokia Mobile Phones (U.K.) Limited | Telephone apparatus with calling line identification |
| US5263084A (en) * | 1991-07-22 | 1993-11-16 | Northern Telecom Limited | Spontaneous caller identification with call-waiting |
| US5377260A (en) * | 1991-12-05 | 1994-12-27 | Sierra Semiconductor Corporation | Telephone circuit to control off-hook status during receipt of caller-ID signal |
| EP0559047A1 (en) * | 1992-03-02 | 1993-09-08 | Siemens Rolm Communications Inc. (a Delaware corp.) | Future blocking of incoming telephone calls |
| US5388150A (en) * | 1992-07-28 | 1995-02-07 | Schneyer; Robin | Automatic incoming telephone call identification and disposition system |
| US5351289A (en) * | 1992-09-17 | 1994-09-27 | Logsdon William K | Caller ID telephone security device |
| CA2115733C (en) * | 1993-03-05 | 1997-12-23 | Menachem Tsur Ardon | System and method to identify the terminating directory number at the customer premises |
| PL174557B1 (en) * | 1993-03-05 | 1998-08-31 | At & T Corp | Connection-making device for identification of manager's terminal number at subscriber's office |
| US5287401A (en) * | 1993-03-15 | 1994-02-15 | Intel Corporation | Apparatus and method for a modem for detecting a call waiting signal |
| CA2143076A1 (en) * | 1994-03-22 | 1995-09-23 | Aileen Y. Chang | Communication system for processing caller id information |
| US5579381A (en) * | 1994-08-25 | 1996-11-26 | Northern Telecom Limited | Methods and apparatus for providing suppressed ringing access |
| US5802166A (en) * | 1994-11-30 | 1998-09-01 | Sni Innovation, Inc. | Dual signal triggered message waiting notification system for indicating storage of different types of messages awaiting retrieval |
| US5649002A (en) * | 1994-12-13 | 1997-07-15 | Colonial Data Technologies Corp. | Method and apparatus for detecting a telephone CPE alerting signal |
| KR0135777B1 (en) * | 1995-01-25 | 1998-04-27 | 김광호 | Selecting calling phone |
| US5651053A (en) * | 1995-01-26 | 1997-07-22 | Mitchell; Peter P. | Telephone call screening |
| US5771281A (en) * | 1995-05-02 | 1998-06-23 | Batten, Jr.; George Washington | Serial-port powered caller identification computer interface |
| US5812648A (en) * | 1996-02-20 | 1998-09-22 | Micron Technology, Inc. | Telephone ringer control device |
| US5737400A (en) * | 1996-02-27 | 1998-04-07 | U-Tel Incorporated | Telecommunications system for accessing subscriber premises equipment using ring suppression |
| US5850435A (en) * | 1996-03-01 | 1998-12-15 | U S West, Inc. | Method for audible caller name announcement with call list feature |
-
1997
- 1997-07-16 US US08/895,102 patent/US6044148A/en not_active Expired - Fee Related
-
1998
- 1998-03-12 WO PCT/CA1998/000222 patent/WO1999004544A1/en active IP Right Grant
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- 1998-03-12 JP JP2000503640A patent/JP2001510961A/en not_active Withdrawn
- 1998-03-12 CA CA002294843A patent/CA2294843A1/en not_active Abandoned
- 1998-03-12 DE DE69821490T patent/DE69821490T2/en not_active Expired - Fee Related
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| EP0997024B1 (en) | 2004-02-04 |
| JP2001510961A (en) | 2001-08-07 |
| WO1999004544A1 (en) | 1999-01-28 |
| EP0997024A1 (en) | 2000-05-03 |
| US6044148A (en) | 2000-03-28 |
| DE69821490T2 (en) | 2004-07-01 |
| DE69821490D1 (en) | 2004-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |