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:
Nov. 26, 1996
Filed:
Mar. 02, 1995
Koutarou Yamada, Hitachinaka, JP;
Youji Hirose, Mito, JP;
Hiroshi Ueno, Hitachinaka, JP;
Isao Watanabe, Hitachinaka, JP;
Yoshio Ogura, Hitachinaka, JP;
Katuhiro Shinohara, Hitachinaka, JP;
Kouhei Katayama, Hitachinaka, JP;
Minoru Murase, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
When a developing agent prepared to have a preset toner density is loaded in a developing unit, a comparing reference level for controlling the toner density in the developing agent is changed to a value higher than the preset value in the initial stage of operation and fresh toner is supplied to the developing agent so that the toner density of the developing agent is increased in comparison to the reference level. Thereby, the developed density is prevented from decreasing due to an excess amount of friction charge of the toner.