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:
Oct. 26, 1999
Filed:
Oct. 25, 1996
Applicant:
Inventor:
Albertus Feiken, Amstelveen, NL;
Assignee:
Koninklijke KPN N.V., Groningen, NL;
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
380 24 ;
Abstract
A method and system for cancelling payments effected with an electronic payment device (11), such a smart card or IC card, in an off-line payment system including transmitting a check value, such as a random number, from a protected storage module of a terminal (12) to the payment device (11) and subsequently checking the check value in the payment device (11). After performing a positive check, a last transaction in a memory of the payment device (11) is cancelled, for example, by decrementing a pointer.