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:
Sep. 24, 1991
Filed:
Dec. 15, 1989
Hisao Watanabe, Yamanashi, JP;
Jiro Fukasawa, Yamanashi, JP;
Shindengen Electric Manufacturing Co., Ltd., Tokyo, JP;
Yamanashi Electronics Co., Ltd., Yamanashi, JP;
Abstract
An electrophotographic apparatus has its electrophotographic component parts divided into three units consisting essentially of a developing unit A, a photoreceptor unit B and a toner cartridge unit C. Each of the units is capable of being detached from and reattached to the main body of the apparatus while maintaining the required relative positions. The service lives of the units are set in such a manner that the ratio therebetween is represented as a ratio between integers, and the relationship therebetween in magnitude satisfies the relationship of the service life of the developing unit A.gtoreq.the service life of the photoreceptor unit B.gtoreq.the service life of the toner cartridge unit C. Thus, the apparatus enables its maintenance to be performed easily and economically without requiring any increase in the size and the cost of the electrophotographic mechanisms.