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:
Jul. 06, 1993
Filed:
Dec. 26, 1991
Shigeru Furuta, Itami, JP;
Etsushi Takebayashi, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An IC card prevents an internal battery from being, rapidly consumed and internal data from being lost due to frequent use or erroneous starts caused by external noise. The number of starts of the card and the number of erroneous starts thereof are respectively counted by registers in a RAM. When one of these start numbers reaches a set value, the receiving circuit selected is switched to another receiving circuit having a higher threshold value and requiring no bias current, or the threshold value of the receiving circuit is increased by an inhibit circuit so that the internal power consumption of the card is suppressed, and the card is not affected by external noise. In addition, when the value of one of the registers reaches a set value, the external device informs the user of the fact that the value has reached a set value, using sound or a visual display.