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. 30, 1999
Filed:
Mar. 31, 1997
Hartmut Schrenk, Haar, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
In a data transfer system having at least one terminal and at least one portable data carrier configuration, for example a chip card, and a method of recharging the portable data carrier configuration through the use of the terminal, an area of a non-volatile memory of the card representing a monetary value is subdivided into two value areas of which only one is activatable into a non-volatile state and the other can only be activated temporarily in each case. When the card is recharged, the new counter status is written into the value area which has initially only been activated temporarily. It is only after checking the correct writing that this value area is switched in such a way that it is activatable into a non-volatile state.