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:
Oct. 13, 1987
Filed:
Sep. 30, 1985
Applicant:
Inventors:
Akira Takata, Toyonaka, JP;
Shigeki Matsuoka, Toyonaka, JP;
Assignee:
Ricoh Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05F / ;
U.S. Cl.
CPC ...
323317 ; 323351 ; 307297 ; 307304 ;
Abstract
A power supply switching circuit for supplying a pair of power supply voltages different in level, such as programming voltage V.sub.pp and reference voltage V.sub.cc, selectively is provided. The circuit includes a plurality of P-channel and N-channel MOS transistors which are appropriately connected such that no leakage or reverse current is produced even if the voltage at the V.sub.pp terminal becomes lower than V.sub.cc.