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:
Jan. 24, 1995
Filed:
Mar. 04, 1993
Yasuo Iijima, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An IC card has a data memory for storing at least one registration key data and a control element for controlling the data memory and is adapted to receive key data, as collation data, from an outside, collate it with the registration key data stored in the data memory, hold a result of collation in a holding section such as a RAM, and determine whether or not a subsequent access instruction be executed for the data memory. A present system above includes a unit, responsive to instruction data input from the outside, for internally clearing the collation result of the key data. As a result, the collation result of the key data is not held at all times during a power supply. It is thus possible to prevent any unauthorized access to an IC card data by an unauthorized person during the power supply and to structure a flexible system.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile