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. 23, 1991
Filed:
Sep. 29, 1989
Hiroharu Hirata, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
An IC card reader/writer has a short-circuit detector for determining, when an IC card is inserted in the reader/writer, whether or not any of connecting terminals for feeding a current to the IC card is short-circuited, and producing a resultant signal representative of the result of determination. A control is responsive to the resultant signal for performing, when the resultant signal does not indicate short-circuit, control such that the current is fed to the IC card via the connecting terminals. A reference voltage generator generates a reference voltage, while the short-circuit detector determines whether any of the connecting terminals is short-circuited or not by using the generated reference voltage.