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:
Jan. 10, 1989
Filed:
Oct. 08, 1987
Kazuo Takahashi, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A process head for use in an electrophotographic apparatus and adapted for conducting developing process with a developer on an electrophotographic film in a developing section of the electrophotographic apparatus. The developing section is surrounded by a seal section. An air pump is provided for supplying the seal section with a seal gas selectively at a low pressure higher than the pressure in the developing section and, hence, capable of preventing developer from leaking out of the developing section and a high pressure higher than the low pressure and high enough to drive the seal gas into the developing section. In consequence, leaking of developer out of the developing section is avoided and the seal gas under the high pressure comes into the developing section so as to ensure the complete removal of unnecessary portion of the developing agent.