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:
May. 18, 1993
Filed:
Oct. 31, 1990
Applicant:
Inventors:
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
235492 ; 235380 ; 235437 ;
Abstract
In a non-contact IC card, when the card is in a standby mode of operation a CPU provides a command to inhibit the application of a clock signal to digital circuitry including the CPU and/or to inhibit the application of an operating voltage to analog circuitry, except for an antenna circuit and a trigger signal demodulating circuit, so that power consumption in the standby mode is reduced. For transfer of data between the IC card and an external device, a trigger signal derived by demodulating received data in the trigger signal demodulating circuit is used to apply the clock signal to said digital circuitry and the operating voltage to all of the analog circuitry.