The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 1990
Filed:
Jul. 17, 1989
Applicant:
Inventors:
Anil Gercekci, Geneva, CH;
Michel Bron, Lausanne, CH;
Assignee:
Motorola, Inc., Schaumburg, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235380 ; 235379 ; 235488 ;
Abstract
A debit card of the type having an integrated circuit on a semiconductor chip embedded in a plastic card includes logic circuitry (10), a counter (2), a ROM (6) and an EEPROM (8) for storing the value of the counter between transactions. By providing two EEPROMs (8A, 8B) in parallel whose values are compared by a comparator (24), the security of the card is increased since operation of the card may be blocked if the two values are not the same, indicating that attempts have been made to fraudulently reprogram the card.