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:
Dec. 21, 1999
Filed:
Sep. 12, 1997
Applicant:
Inventor:
Michel Marco Drupsteen, NA Alkmaar, NL;
Assignee:
Koninklijke KPN N.V., AE Groningen, NL;
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235492 ; 235380 ;
Abstract
An efficient way of storing multiple tickets on smart cards. A ticket comprises a validation count field for registering by way of a validation count the number of times the ticket may be used. Preferably, the validation count is lowered each time the ticket is validated, the validation being effected by writing validation data in the validation field of the ticket. In this way a single ticket can thus be used as a multiple ticket, thus saving memory space. The validation count is also effective in limiting the number of tickets validated, thus limiting the extent of possible fraud.