Patent GB-1494736-A (GB)
Title: Token-control
IPC: G06K17/00
Filed: 1974-01-21
Abstract: 1494736 Credit-card controls CHUBB INTEGRATED SYSTEMS Ltd 21 Jan 1975 [21 Jan 1974] 02699/74 Heading G4V A method of token control has performance of an operation in response to presentation of a token conditioned by information which is read from a recording borne by the token, the recorded information relating to an aggregate of the content of previous use of the token within one of a succession of periods of time throughout each of which the token is authorized for limited use, and in which the recorded information is updated on the token in dependence upon the operation performed and the result of comparison between a date read from the token-recording and the current date, wherein the date recorded on the token is taken to define the commencement of the authorized use period which is next to commence following the last use of the token, and the record of this date is updated on the token such as to establish a new, current period of authorized use of the token commencing with the durrent date when the result of said comparison signifies that the next period-commencement is not later than the current date. Fig. 1 represents a system to dispense packets of bank notes. A credit card 10 has alpha-numeric characters 11 and a strip 12 of ferromagnetic oxide having the same information recorded thereon. Each customer has a secret personal identification number and is informed of a maximum permissible rate or frequency of use of the card in a specific period of days. In operation a card is presented to opening 14 where it is blocked by apertured plate 16 until electromagnetic detector 17 detects strip 12. When plate 16 is moved the card is moved along guideway 18 by rollers 19 driven by card-transport unit 20. The card thus passes across reading-recording head 21 and reading heads 22, 23. Heads 21, 23 are aligned to read magnetically recorded information on track T1 whilst head 22 reads track T2. Four words W1-W4 are recorded on track T 1 using the technique described in Specification 1,336,132. Head 21 reads and subsequently makes recordings of, words W1-W3. Head 23 reads word W4 only. Words W5, W6 represent the card expiry date and the customers account number respectively. Signals obtained from unit 22 are supplied to a "use" processing unit 27 and an "account" processing unit 28 respectively. Signals obtained from words W1-W4 are supplied to "use" processing unit 27. Word W1 indicates the date following the last use, from which the next period of days is to commence whilst W2 indicates the number of packets that immediately following the last use could still be requested without exceeding the frequency-of-use imposed on the customer. Words W1, W2 are recorded as binary counts. The date of commencement of the next period of days represented by W1 is recorded as a count of the number of days from that date to the end of the year of expiry. Device 29 is set day-by-day to supply to the "use" processing unit 27 the current date. The days to the end of the year are compared in unit 27 with the word W1. If they are greater then dispenser 32 can be activated by release unit 31 to dispense packets up to the number indicated by word W2. "Account" processing unit 28 checks the account number received from word W6 and compares it against numbers that are no longer valid. If the account number is cleared unit 28 supplies a signal to release unit 30. Unit 28 also derives a personal-identification number and conveys it to comparison unit 34. If the number entered by push-buttons 35 is correct unit 34 conveys a signal to unit 30 so that the number of packets requested on selector 36 are dispensed by dispenser 32. After dispensing rollers 19 are driven in reverse and unit 21 records the appropriate word W2 and re-records word W1 on the card. If no dispensing takes place a customer is allowed three attempts with one insertion of the card to satisfy the correspondence check using buttons 35. Normally the card is returned to the customer unless an overall limit of unsuccessful attempts is reached. Word W3 records the number of unsuccessful attempts made in the life of the card and is updated as necessary. The card is also retained if the check by unit 28 is not satisfied or if the date of expiry of the card has passed. If the period of days represented by word W1 has been passed then a new word W1 and a new word W2 are recorded on the card when it is returned. These numbers are obtained by unit 27 from word W4 which is indicative of a customer's grading. Units 27 and 28 may be specific units installed with unit 13 or their function may be performed by a central computer or data processor that is common to a number of cardreception units and is in on-line communication with them.