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:
Feb. 07, 1989
Filed:
Mar. 03, 1987
Yoshimi Shigenaga, Higashiyamato, JP;
Casio Computer Co., Ltd., Tokyo, JP;
Abstract
An IC card system comprises an IC card terminal and an IC card which is inserted into the terminal, the terminal including a power-supply circuit for supplying data-writing power to a memory provided in the IC card, and a timer circuit for measuring a period of time corresponding to the maximum time during which one unit of data can be written into the memory. The supply of power to the IC card is renewed every time the IC card sends a request for an unit of data, within the period of time set in the time-measuring circuit. The supply of power is stopped when the IC card makes no request for an unit of data within the above-mentioned period of time.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile