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. 21, 1999
Filed:
May. 07, 1998
Soon-Nam Kim, Suwon, KR;
Samsung Electronics Co., Ltd., Kyungki-do, KR;
Abstract
An electrophotographic image forming apparatus prevents the formation of a background image. The apparatus includes a photosensitive drum with a ground plate, and a power supply for applying a negative voltage to the ground plate in the case where the apparatus is powered on after a long time in the power-off state, or where the apparatus is powered on for many hours without forming an image. The applied negative voltage has a potential lower than a critical potential where the toner deposited on a developing roller can move to the photosensitive drum. Further, the negative voltage is applied to the ground plate, only while the charge location on the photosensitive drum rotates to reach a developing position.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile