|Publication number||US3792446 A|
|Publication date||Feb 12, 1974|
|Filing date||Dec 4, 1972|
|Priority date||Dec 4, 1972|
|Also published as||CA990874A1|
|Publication number||US 3792446 A, US 3792446A, US-A-3792446, US3792446 A, US3792446A|
|Inventors||Eckert A, Mc Figgins R|
|Original Assignee||Pitney Bowes Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (146), Classifications (14)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent [191 McFiggins et a1.
[451 Feb. 12, 1974 1 REMOTE POSTAGE METER RESETTING METHOD  Inventors: Robert B. McFiggins, Stamford;
Alton B. Eckert, Jr., Norwalk, both  US. Cl. IMO/172.5, 444/1  Int. Cl. G061 9/18  Field of Search340/l72.5. 147 R, 149 A, 152 R;
179/2 A, 2 CA, 2 DP; 444/1  References Cited UNITED STATES PATENTS 308L402 3/1963 Scanllin 340/152 3305,83) 2/1967 Looschen et a1. 340/1725 1428948 2/1969 Simjian 340/147 E t COMDUTER 0 SET I I E Masai E 22- umr c I 3/1970 Simjian 340/152 3/1972 Glover et a1 179/2 DP Primary Examiner-Raulfe B. Zache Attorney, Agent, or Firm-William D. Soltow Jr.; Albert W. Scribner; Martin D. Wittstein [57 ABSTRACT I A data center equipped with a programmed digital computer and a voice answer-back unit processes telephone calls from users of postage meters equipped with combination locks, wherein each lock inhibits recharging of its associated meter with an additional postage increment while locked and its combination changes in random sequence with each actuation to enable meter recharging. The computer operates via the answer-back unit to voice communicate with the caller in requesting the input of data uniquely identifying the caller and the postage meter to be recharged pursuant to issuing the next combination 10 Claims, 4 Drawing Figures DATA CENTER Lmmhw PATENTEDFEB I 21974 SHEET 2 BF 3 PATEN-TED J 3. 792 .446
sum 3 or 3 ENTER RETFUEVE RANDOM N9 y too 430 I02 YES ADD I T0 REPEIPSWWITHf RANDOM N2 RANDOM N2 1 CONSTANT x RANDOM N9. NEW RANDOM N2 1 STORE FIRST 12 BITS AS DIGITS OF HALF new COMBINATION (PASS I OR '2) YES STORE NEW RANDOM NQ/ mom PASS 2 108a. IOBb mac load s23: 3029|282726252423222l 2029 na 0 1e as l4 l3 l2 n no 9 a 7 6 s 4 a 2 I Y J o 8 RANDOM N- REMOTE POSTAGE METER RESETTING METHOD BACKGROUND OF THE INVENTION Postage meter resetting or recharging and record keeping operations are now highly dependent on manual routines by both the Postal Service and meter users. Post Office employees have to visually inspect, open, recharge, and reseal the meters, in addition to filling out several different forms for record keeping purposes. These tasks will continue to become more expensive as labor rates rise and as more postage meters come into service. That is, the effort required to administer the metered mail system will rise in direct proportion to the number of postage meters in service.
In addition to the time required to recharge postage meters, there are occasional errors in recharging the meters which are usually not discovered until the user returns with the meter to his office. A return trip to the Post Office is then required to obtain the correct recharging.
Meter recharging is a reasonably complicated process involving large sums of money. Special training for selected Post Office personnel is required to recharge the meters and to maintain the records. This operation must be supervised and special assignments must be made when the trained personnel are on vacation or are out sick.
The present record keeping system for postage meters is completely manually administered. The Postal clerk is required to issue a receipt which contains all of the meter register readings before and after the re charging, along with the amount of the postage increment recharged into the meter. This recharging information is also entered into the customers Daily Record of Meter Register Readings" book and a complete transaction is entered into the Post Office Record of Meter Settings book. Each Post Office is also required to make a quarterly summation of postage sales for all customers.
The users of the metered mail system are inconvenienced by the fact that they must bring their meters to the Post Office for recharging. The problems associated with such a trip involve obtaining a check or cash to pay for the additional postage to be recharged into the meter, actually making the trip, parking and waiting in line at the Post Office. This takes time and thus costs the meter user money.
The foregoing is not to say that the metered mail system does not have significant advantages. Its current wide use is testiment to the fact that it indeed does have tremendous advantages. The most widely used metered mail system is based on a postage meter having the features of double registers (ascending and descending) and credit balance lockout. With this type of meter, the customer has complete control of the postage kept in the meter and cannot use more postage then has been paid for. The Post Office is assured of payment and does not have to operate a collection department or consider suspension of services for nonpayment. The recharging records and procedures provide an excellent record of revenue collection and cannot easily be defrauded, thus minimizing any temptation to collusion between a meter user and a Postal representative to defraud the Government. By virtue of these advantages, there need be no discrimination made by the Postal service against a mailer becoming a metered mail user. Moreover, metered mail does not have to be cancelled, thereby simplifying the handling of mail by the Post Office.
SUMMARY OF THE INVENTION In accordance with the present invention, there is provided a system for overcoming the above-noted drawbacks to the present metered mail system without sacrificing any of its advantages. This system is based on the use of a double register, credit balance lockout, postage meter, except that the meter is equipped with a combination lock whose combination changes in predetermined random sequence (termed pseudo-random sequence by mathematicians) each time it is actuated. This combination lock operates on the resetting or recharging mechanism of the postage meter such that, when unlocked, the mechanism may be manipulated to recharge the meter with an increment of postage. As the meter is recharged, the combination lock automatically locks itself to prevent subsequent recharging of the meter unless and until the correct new and different combination is entered. Combination locks of this type, suitable for use in the application of the present invention, are disclosed in US. Pat. Nos. 3,034,329 and 3,664,23l.
The present invention is specifically directed to an automated method for issuing the respective new combinations to a plurality of remotely located postage meter users from a central station over normal touchtone telephone equipment. The basic operating components of the central station are a programmed digital computer operating in accordance with the present invention and a conventional voice answer-back unit. The computer answers each users telephone call and automatically, via the answer-back unit, formulates a series of voice instructions requesting the user to input via the phone keys certain encoded data uniquely identifying the caller and the meter to be recharged. The computer processes this input data for authenticity and, when satisfied, automatically issues, via the voice answer-back unit, the new combination capable of actuating the callers combination lock to permit recharging of the associated meter with an additional increment of postage without having to remove the meter from its normal location. At the time of issuing the new combination to a particular user, the computer automatically updates the user's file or account held in memory, and may if desired initiate the process of billing the user for the increment of postage to which he has been given access.
DESCRIPTION OF THE DRAWINGS For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description taken in connection with the accompanying drawings, in which:
FIG. 1 is an overall, generalized block diagram of a system constructed in accordance with the present invention;
FIG. 2 is a flow diagram illustrating the operation of the data center of FIG. 1;
FIG. 3 is a flow diagram of a sub-routine for executing the function of a random number generator for calculating the new combination issued in the flow diagram of FIG. 2; and
FIG. 4 is a diagrammatic illustration of the manner in which the sub-routine of FIG. 3 extracts the new combination from the numbers developed by the random number generator. DETAILED DESCRIPTION Referring to FIG. I, the system of the invention comprises a plurality of remote stations capable of communicating with a data center, generally indicated at 12. via telephone exchange equipment, generally indi cated at 14. The transmitter-receiver at each remote station 10 is a conventional tone signalling telephone 16 for effecting two-way communication with the data center l2. The data center includes a data set 18 of known construction, such as a Bell System Model 403 data set, for translating frequency encoded data inputs from one of the telephones I6 into a suitable machine language for a programmed or special purpose digital computer 20, for example, a Data General Nova." The computer, in turn, controls a voice answer-back unit 22 of known construction such as a cognitronics Model 632, to formulate voice responses for transmission via data set 18 and telephone exchange 14 back to the particular telephone 16 in communication with the data center 12. The telephone at each remote station It) is preferably of the touch-tone type capable of transmitting frequency encoded numeric outputs to data center l2. Alternatively, a dial telephone may be equipped with a touchtone pad capable of generating frequency encoded digital data in the same manner as a touch-tone phone.
Also located at each remote station 10 is a postage meter 24 of known construction, such as a Model 5300 Pitney Bowes meter, having double register and credit balance lockout features. The two registers comprise an ascending register, which accumulates the dollar amount of postage used over the life of the meter and a descending register, which is incremented with each dollar amount ofpre-paid postage reset into the meter and is decremented as this increment of postage is used. When the descending register is decremented to a dollar amount of postage which is less than the maximum dollar amount of postage capable of being issued by the meter in a single cycle, the meter automatically locks out to prevent further usage until recharged. This feature insures that the user will always have a postage credit balance and is incapable of operating his meter in a manner such as to create a deficit situation wherein the Post Office is owed money for postage used.
The postage meter at each remote station 10 is modified to the extent that it is equipped with a combination lock 26 operating on the resetting or recharging mechanism of the postage meter. This combination lock, in accordance with the invention, has the unique characteristic of automatically changing its combination each time it is actuated. When actuated or unlocked, the user is capable of manipulating a knob 28 to increment the descending register of the postage meter 24 by a predetermined dollar amount of a postage increment. This may be accomplished, for example, by a single turn of knob 28, whereupon lock 26 locks up the recharging mechanism so that another increment of postage cannot be set into the meter until the correct new and different combination is entered into the lock 26 by way of clusters of keys 30 and 32, in the illustrated embodiment.
As will be seen from the description to follow, the system of FIG. 1 permits remote postage meter resetting or recharging at the meter site, thus eliminating the necessity of the user having to transport his meter to the Post Office for recharging with an additional increment of postage. This remote recharging is effective using existing communications links, i.e., the telephone exchange network, from a remote central location without the requirement for direct signal control on the postage meter itself, as has been proposed in the past. These prior approaches all involved drastic revisions of existing postage meter designs so as to accept a remotely generated and transmitted initiating or enabling signal for recharging the meter, as well as expensive communications and terminal equipment. In the remote recharging system of the present invention, the postage meter 24 need only be slightly modified so as to accept the adaptation of combination lock 26.
The manner in which the data center handles an incoming call from a user at one of the remote stations 10 seeking to recharge his postage meter 24 is shown in the flow diagram of FIG. 2. When a user determines that his postage meter needs recharging, he keys in the telephone number of the data center on his telephone 16. The data center answers, as indicated at 39, to complete the telephone connection, and the computer 20 controls the voice answer-back unit 22 to compose a voice response, as indicated by output block 40, for transmission back to the caller requesting a numeric input uniquely identifying the caller or the calling remote station 10. This numeric input request may be for an account number, or the like, which is also held in computer memory. Computer 20 then converts to an input mode, illustrated by input block 42, awaiting receipt of a predetermined number of digits, representing, for example, the caller's account number. The user then keys in his account number using the numeric keys on his touch-tone phone 16. The frequency encoded digit inputs are converted by data set 18 at the data center 12 into computer language for the computer 20. The computer then searches its memory to determine if the received account number is stored therein, as represented by decision block 44. If the computer locates a comparable account number in its memory, meaning that the received account number is valid, the program exits decision block 44 on branch 45 to output block 46.
On the other hand, if the computer fails to locate in its memory an account number comparable to the one received from the caller, the program exits decision block 44 on branch 47 to a second decision block 48. Here the computer tests to determine how many chances the caller has been given to input a valid account number. If the caller has had less than three attempts to enter a valid account number, the program exits decision block 48 on branch 49 to output block 50, wherein the computer controls the voice answer back unit 22 to formulate a voice transmission back to the caller informing him, in effect, that his entry was not valid and to please reenter his account number. The program, as indicated by branch 51, reverts back to the input of block 42 wherein the computer is again conditioned to accept an account number entry. If, on three passes through decision block 44, the caller has failed to enter a valid account number, the decision is made that the call being processed is probably spurious and the program exits decision block 48 on branch 53 pursuant to breaking the telephone connection with the caller, as indicated at 54.
If on one of his allotted three tries, the caller has entered a valid account number, the computer goes into an output mode, as indicated by output block 46, wherein the voice answenback unit 22 is controlled to compose a voice transmission requesting the entry of a second multi-digit number, such as a meter number, uniquely identifying the postage meter to be recharged. as indicated by input block 55, the computer converts to the input mode awaiting receipt of the numeric entry of the meter number of the caller's postage meter 24. Upon entry of the meter number, the computer determines, as represented by decision block 56, whether or not the callers account file held in memory and tile identified by the previously entered account number includes a meter number identical to the one entered by the caller; it being appreciated that the caller may have more than one postage meter. lf identity is found, the program exits decision block 56 on branch 57 leading to output block 60. On the other hand, if identity is not found, the program exits decision block 56 on branch 58 leading to a second decision block 59, wherein a check is performed to determine how many attempts the user has been afforded to enter a valid meter number after having entered a valid account number. If the user has had less than three such attempts, the program exits decision block 50 on branch 6], wherein the computer enters an output mode, indicated by output block 62, to control the voice answerback unit to compose a voice transmission to the effect that the meter number entry is not valid and to enter it again. The program reverts back, over branch 63 to the input of block 55 as the computer awaits another attempt by the user to enter a valid meter number. If the caller has not done so on three passes through decision block 56, the program exits decision block 59 on branch 64 to output block 65, wherein the computer again advises the caller that his meter number entry is not valid and formulates the voice instruction to call a particular telephone number for personal assistance. The computer thereupon breaks the telephone connection with the caller, as represented at 54. The philosophy in this situation is that since the caller had previously entered a valid account number it is probably not a spurious call. Thus, the caller is requested to call for personal assistance in determining why the caller was unable to enter a valid meter number after three attempts, having previously entered a valid account number.
Assuming the caller has entered a valid account number as well a valid meter number, the computer, as indicated in output block 60 controls the voice answer back unit to formulate a voice transmission requesting the caller to enter the reading in the ascending register (A/R) ofthe identified postage meter to be recharged. The computer then converts to the input mode, as indicated in input block 66, awaiting entry of the ascending register reading. Upon receipt, the computer reverts to the output mode to control the voice answerback unit to formulate the voice transmission requesting the user to enter the reading in his descending reg ister (D/R), as indicated by output block 67. The computer, as indicated in input block 68, awaits the entry of the users descending register reading, and, upon receipt, the program proceeds over branch 69 to decision block 70. Here, the computer checks the descending register reading just entered with the reading of the descending register (D/R') stored in the computer memory under the entered meter number on the occasion of the previous recharging of the user's meter.
Since the descending register is decremented by the amount of postage issued with each meter cycle, the current descending register reading cannot be greater than the descending register reading stored in the computer memory. If, however, this is found to be the case, the program exits decision block 70 on branch 71 to a second decision block 72 wherein the computer tests to determine how many times the current descending register reading has been found to exceed the previous descending register reading. If the number of passes through decision block 72 is less than three, the pro gram exits on branch 73 to an output block 74. The computer then controls the voice answer-back unit to compose a voice response advising the caller, in effect, that his descending register entry is not valid and to repeat the entries of the ascending and descending register readings of his meter. The program exits output block 74 on branch 75 and reenters output block 60 and preceeds through input/output blocks 66, 67 and 68 to decision block 70. If after the third pass through this portion of the program the current descending reg ister reading is still found to be larger than the stored descending register reading, the program exits decision block 72 on branch 76 to output block 65, wherein the voice answer-back unit is controlled by the computer to formulate a voice transmission inviting the caller to call for human assistance.
Still referring to FIG. 2, if the descending register reading entered by the caller is not larger than the previous descending register reading held in memory, the program exits decision block 70 and enters a decision block 78. The computer sums the ascending and descending register readings (SOR) entered by the caller and compares this total with the sum of the same two register readings (SOR') stored in the memory as the result of the last recharging of the identified meter. If everything is in order, these two totals should be equal. This is seen from the fact that as the postage meter is used subsequent to the last recharging, the amounts of postage by which the descending register is decremented are equal to the postage amounts by which the ascending register is incremented. Consequently, the total of these two register readings should remain con stant between rechargings. If the two sums are equal, the program exits decision block 78 on branch 79 where some additional checks are performed pursuant to issuing the next combination for the combination lock 26 associated with the meter to be recharged.
On the other hand, if the sums of the entered register readings and the register readings held in memory are not equal, the computer performs one or more additional checks in an effort to determine if the inequality detected in decision block 78 arose for reasons other than an erroneous digit entry by the caller.
Thus, as seen in FIG. 2, in the event of inequality the computer exits decision block 78 and enters decision block 80, wherein the computer checks to see if the ascending register of the identified postage meter overflowed since the last recharging. To perform this check, the computer compares the sum of the register readings entered by the caller with the sum of the register readings held in memory minus the size of the ascending register. That is, if the ascending register has a six digit capacity, for example, capable of registering readings from zero to 999,999, its register size is 1,000,000. It will be seen that if the ascending register is incremented through zero since the last recharging ol the meter. this event can be acccommodated in a sum of registers check by substracting from the sum of the stored register readings the register size, i.e., [000,000. This computation compensates for the fact that the ascending register has overflowed and decision block 80 will detect an equality. In such event, the program exits on branch 79 pursuant to issuing the next combination to the caller.
lf ascending register overflow was not the reason for the detected inequality in the sum of registers check, the program enters still another decision block 82, wherein the computer checks to see if the caller failed to actually recharge his meter the last time he called to receive a new combination. That is, the caller having previously called to receive a new combinaton did not enter it into his combination lock 26 and increment his descending register with the amount of allotted additional postage. As will be seen, the computer, at the time of issuing each new combination, incre merits the descending register reading held in memory with the amount of additional postage to which the calier is given access, and, if he does not recharge his meter, the sum of registers checks performed in decision blocks 78 and 80 will have failed. To determine if this situation exists, the computer compares the sum of the register readings entered by the caller with the sum of the register readings held in memory minus the increment of postage previously allotted to the caller. If an equality is now detected in decision block 82, the program exits on branch 83, and the computer proceeds to issue the same combination stored in the memory that was given on the previous call but which had not been entered into the combination lock for some reason. The caller may then recharge his postage meter with the increment of postage he previously had been given access to, and for which he previously had been charged. However, the computer does not update the caller's file. Therefore he is not charged for the same increment of postage again.
If the check illustrated by decision block 82 fails, the computer makes one final check, illustrated by decision block 84, to determine that the failure of the sum of registers checks illustrated in decision block 78, 80 and 82 was for a reason other than an erroneous digit entry by the caller. This final check involves testing to see if the reason for the sum of registers inequality arose, because the callers ascending register overflowed and he also neglected to recharge his meter the last time he called and was given the combination permitting him to recharge his meter. This check is carried out by comparing the sum of the registers entered by the caller to the sum of the registers held in computer memory minus the allotted increment of postage minus the ascending register size. If an equality is now detected, the program exits decision block 84 on branch 83 pursuant to issuing the same combination to the caller that he was given the last time he called. n the other hand, if an equality is still not obtained, the program exits decision block 84 on branch 85 to decision block 72, which checks to see how many passes through decision blocks 70, 78, 80, 82 and 84 the computer has executed for this particular caller. If the number of passes is less than three, the program exits decision block 72 on branch 73 to output block 74, and the caller is requested to reenter his ascending and descending register readings. lf, on the third pass through these decision blocks, a sum of registers inequality is still detected, the program exits decision block 72 on branch 76 to output block 65, and the caller is invited to call for human assistance.
When the program exits decision blocks 78 or 80 on branch 79, the computer checks the caller 5 account, as represented by decision block 90, to determine that his account has a sufficient credit balance to pay for the increment of postage with which he is seeking to recharge his meter. If the credit balance is found to be insufficient, the program exits decision block to connector B, which is common to connector B at branch 76 leading to output block 65, wherein the computer formulates, via the voice answer-back unit, the voice transmission inviting the caller to call for human assistance.
When the computer determines that the callers account has an adequate credit balance, the program exits decision block 90 and enters decision block 92, wherein the computer checks to determine whether or not the caller has used up the entire random sequence of combinations accomodated in the meters combina tion lock. If the combination lock is of the type disclosed in US. Pat. No. 3,664,23 l, noted above, wherein the random sequence of combinations is es tablished by a series of perforations in a paper tape, the check illustrated by decision block 92 determines when the paper tape is used up and the installation of a replacement tape is required. Assuming, for example, that there is a random sequence of 500 lock combinations punched into the tape, the computer keeps track of the number of combinations issued and, when 500 have been issued, the program exits decision block 92 to connection B, common to the input of output block 65. The caller is thus invited to call for human assistance.
Assuming that the entire sequence of combinations has not been issued, the program exits decision block 92 to decision block 94, wherein the computer checks to see that, with the descending register reading entered by the caller, the additional increment of postage which the caller is being given access to will not overflow the descending register. Should the descending register overflow when being recharged, the credit bal ance lockout feature built into conventional postage meters will prevent the caller from using all of the postage increment if it were recharged into the meter. If the computer determines that descending register overflow will occur, the program exits decision block 94 to connection B and thence to output block 65, requesting the caller to call for human assistance.
Having cleared all of the above described checks, the computer is now programmed to provide the new combination for the postage meter identified by the meter number entered by the caller. There are of course a number of ways in which this can be done. For example, the computer may store for each remote meter ser viced by the data center the same random sequence of combinations as are accommodated in the combination lock adapted thereto. The computer would then atuomatically retrieve the next combination in sequence from its memory for issuance to the caller. This approach has the distinct drawback of taking up inordinate amounts of computer memory. A more practi cal approach is to utilize a random number generator sub-routine, as generally indicated by sub-routine block 96 in FIG. 2 and as disclosed in greater detail in the flow diagram of FIG. 3.
As seen in FIG. 3, pursuant to generating the new combination, the computer, as indicated by block 98, retrieves a random seed number stored in its memory under the meter number of the particular postage meter to be recharged. This random number is checked, as illustrated by decision block 100, to determine if it is odd or even, and if even, it is incremented by one, as indicated by block 102. This is done because the particular random number generation method illustrated, a modified power residue method, has a longer repeat period when using odd numbers rather than even numbers. Thus odd seed number, as indicated by block 104, is multiplied by a constant to develop a new random number. Assuming a 32-bit computer word length, the overflow created by this multiplication is discarded and the 32 least significant bits become the new random seed number. The l2 most significant bits of this random number are stored in binary coded decimal form as the four digits of the first half of the new combination. That is, as indicated in FIG. 4, the 12 most significant bits, indicated at 108, of the random number are divided into four groups 108a 108d of 3 bits, each representing a decimal digit zero through seven of the first half of the new combi nation. This first half of the new combination for entry in key cluster 30 is stored, while the computer checks, as indicated by decision block 110 to determine whether this is the first or second pass through the random number generator sub-routine for the identified postage meter. If it is the first pass, the new random -number generated by the computation of block 104 is used, as indicated at block 112, to re-enter the subroutine of FIG. 3 at decision block 110. If this new random number is even, it is incremented by one. If it is already odd, this new random number is multiplied by the constant, as indicated by block 104, to generate still another random number. The overflow bits are discarded, and the 12 most significant bits of the resulting 32-bit random number are retained as the four digits in BCD form of the second half of the new combination for entry in key cluster 32. The new random num ber generated on the second pass through this subroutine is stored as the new seed number as indicated by block 114, for the random number generator subroutine when the identified postage meter is to be again recharged. As indicated by block 116 in FIG. 3, the two halves of the new combination are assembled and used as the basis for controlling the voice answerback unit to compose the new combination for voice transmission back to the caller, as indicated by output block 118 in FIG. 2.
It is understood that the random number generation method used in calculating each combination of the random sequence (sub-routine 96) is also used in preparing the punched paper tape or other form of storage media accommodated in the lock to successively qualify the identical random sequence of combination for opening or actuating the lock. Thus the sub-routine 96 and the particular combination lock for the identified meter to be recharged each progress through the same unique random sequence of combinations in tandem, since the identical seed numbers are used in each case. It will be appreciated that the combination locks may be equipped with micro-computers using the same random number generation method to calculate the new combinations in concert with sub-routine 96.
It will be appreciated that the pseudo-random number generation sub-routine 96 illustrated in FIG. 3 is intended as purely illustrative, as there are manifold known random number generation algorithms which may readily be used in the practice of our invention.
Returning to FIG. 2, prior to the voice tranmission of the new combination to the caller, the computer executes a sub-routine, indicated at 119, wherein the callers account and postage meter file, held in memory, are updated. While the computer memory may be organized in a number of ways, preferably each postage meter is allotted a block of memory locations addressed by a unique meter number which is entered by the caller in accordance with input block 55. Each account is also allotted a block of memory locations addressed by a unique account number, as entered in accordance with input block 42. In each meter number addressed memory block is stored the account to which that identified postage meter belongs. As represented by decision block 56, the computer, in effect, determines that the entered meter number is not only stored in the memory, but also cross-checks to determine that the identified meter belongs to the previously entered account number before preceeding to that part of the program calling for entry of the ascending register reading represented by output block 60 in FIG. 2. Stored in each account number addressed block is the credit balance for that particular account. This credit balance is debited in sub-routine 119 with the increment of postage to which the caller is given access when the function represented by output block 118 is executed. This credit balance is credited by the entry into the computer of payments remitted by the caller. Deficiency of this stored credit balance figure is checked by decision block prior to the calculation of the new combination in subroutine 96.
In each meter number memory block is also stored the fixed increment of postage by which that particular meter can be recharged; it being understood that the amount of this postage increment may vary from meter to meter. Also stored in each meter number memory block is the ascending register and descending register sizes for that particular postage meter. This information is used in decision blocks 80, 84 and 94. Except for the credit balance figure for each account, the above data remains constant, as stored in memory. The remaining data stored in memory under each meter number is variable data which is updated pursuant to sub-routine 119. This data includes the updated ascending and descending register readings, as entered by the caller, the new random seen number derived by the random number generator sub-routine of FIG. 3 and stored until such time as the next new combination is to be calculated, the combination calculated by the random number generator sub-routine for issuance to the caller, and the count of the combinations issued as used in decision block 92.
It is seen from FIG. 2, when either decision blocks 82 or 84 determine that the caller failed to recharge the postage meter in question with the postage increment to which he was previously given access, sub-routine 96 is bypassed, and the computer retrieves the combination in memory calculated by sub-routine 119 on the previous occasion. This stored combination is then transmitted back to the caller without altering the callers credit balance and the other variable data for that particular postage meter stored in memory.
Returning to FIG. 2, once the new combination is transmitted to the caller, the computer is conditioned to accept an entry of three digits, as represented by input block 120. The computer goes through a time out function awaiting the entry ofthree digits. If, at the end of the time out function, no three digits have been received, the program hangs up, as indicated at 128, to break the telephone connection with the caller, if the caller has not already done so. It will be appreciated that the program will execute a similar time out function in anticipation of the receipt of all data entries, (e.g., input blocks 42, 55, etc.) and will hang up if such entries are not timely. If the caller keys in the letters RPT (778), the abbreviation for repeat," the program exits decision block 122 on branch 123, returning to the entry for output block I18, and the computer controls the voice answer-back to transmit the same new combination back to the caller. if, on the other hand, the caller enters the letters AGN (246), the abbreviation for again," the computer determines that the caller desires still another increment of postage and the program exits decision block 124 onto connection A which is common to the input block 60. The computer then requests entry of the ascending register reading and the new descending register reading, i.e., with the new increment of postage to which the caller has just been given access added in. The new, incremented descending register reading must be transmitted to the data center, whether or not it has in fact been incremented, otherwise the caller will be given the same combination when the program reaches decision block 82. Thus, the end result would be the same as though the caller had entered the letters RPT rather than AGN. However, if the incremented descending register reading is entered, the caller will be given the next combination in sequence, assuming his credit balance is still sufficient (decision block 90), the sequence of combinations in his combination lock has not been expended (decision block 92), and the descending register will not overflow (decision block 94),
It will thus be seen that the objects of the invention made apparent from the foregoing description are efficiently attained, and, since certain changes may be made in carrying out the above method without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.
Having described the invention, what is claimed as new and desired to secure by Letters Patent is:
i. For use at a data center to process telephonic calls from remotely located users of postage meters equipped with combination locks wherein the locks inhibit recharging of their associated meters with increments of postage while locked and their respective combinations change in random sequence with each actuation thereof to permit meter recharging, and wherein the data center is equipped with a programmed digital computer and a voice answer-back unit, the method comprising the steps:
A. answering an incoming telephonic call from a postage meter user to establish two-way communication;
B. formulating via the answer-back unit, a voice response for transmission to the user requesting the input of data uniquely identifying the postage meter to be recharged;
C. processing said identification data. upon receipt,
to check the authenticity of the call;
D. determining the next combination capable of ac tuating the combination lock adapted to the postage meter to be recharged;
E. updating the users file held in computer memory to reflect the fact that the identified postage meter is to be recharged; and
F. transmitting, via the answer-back unit, said next combination to the user, thereby affording to the user the capability of recharging the identified postage meter.
2. The method defined in claim 1, wherein the post age meters are each equipped with ascending and descending registers, which further includes the steps of:
A. formulating, via the answer-back unit, a voice transmission to the user requesting the input of the numerical contents of the ascending and descending registers of the identified postage meter;
B. summing the contents of the ascending and descending registers, as entered by the user, and comparing this total with the total of these register contents held in computer memory as the result of the previous recharging of the identified postage meter;
C. upon the detection of the equality therebetween,
preceeding with the determination of the next combination; and
D. said updating step including storing in the computer memory the new contents of the ascending and descending registers as entered by the user.
3. The method defined in claim 2, wherein the computer memory also stores the current credit balance of each user's account and the dollar amount of the increment of postage to which each postage meter may be recharged upon a single actuation of the combination lock adapted thereto, which further includes the step of, prior to proceeding to the determination of the next combination, checking the credit balance of the users account to determine if sufficient funds are on deposit to cover the increment of postage requested by the user.
4. The method defined in claim 2, further comprising the steps of developing a random sequence of combinations for each combination lock using a random number generator, and performing new combination determination steps using a random number generation algorithm the same as was used in developing the random sequence of combinations accommodated in each lock.
5. The method defined in claim 4, which further includes the step of checking to see that the entire random sequence of combinations accommodated in the identified combination lock has not been issued to the user.
6. The method defined in claim 2, which further includes, in the event inequality is detected between the sum of registers entered by the user and the sum of registers stored in computer memory, checking to determine if the ascending register of the identified postage meter overflowed since its previous recharging by comparing the entered sum of registers total with the sum of the stored register readings minus ascending register size and, if equality is then detected, proceeding to the new combination determining step.
7, The method defined in claim 2, wherein the combination issued on the previous occasion when the identified postage meter was sought to be recharged is stored in computer memory, which further includes in the event inequality is detected between the sum of registers entered by the user and the sum of registers stored in computer memory the steps of:
A. checking to determine if the identified postage meter was actually recharged on that previous occasion on the basis of the entered and stored register readings and the postage increment by which the identified postage meter may be recharged, and, if not;
B. retrieving the stored combination from memory for transmission to the user without executing said next combination determining step.
8. The method defined in claim 2, which further in cludes the steps of:
A, responding to an input request from the user for a second postage increment for recharging into the identified postage meter by requesting the input of the numerical contents of the ascending register and the descending register with the first postage increment included therein;
B. again summing the register readings entered by the user and comparing this total with the total of the previously entered register readings held in memory;
C. upon the detection of equality therebetwecn, re-
peating said next combination determination, updating, and next combination transmitting steps. in sequence.
9. The method defined in claim 8, which further in cludes the step of determining that the requested postage increment will not overflow the descending register of the identified postage meter before preceeding to said next combination determining step.
10. The method defined in claim 8, further comprising the steps of developing a random sequence of combinations for each combination lock using a random number generator. and performing a new combination determination step using a random number generation algorithm the same as was used in developing the random sequence of combinations accommodated in each lock.
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|U.S. Classification||705/403, 379/91.1, 379/111|
|International Classification||G07B17/00, G06F3/16|
|Cooperative Classification||G07B2017/00233, G06F3/16, G07B2017/00096, G07B2017/00161, G07B17/00193, G07B17/0008|
|European Classification||G07B17/00D2, G07B17/00E1, G06F3/16|