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:
Feb. 27, 2001
Filed:
Sep. 14, 1999
Robert J. Lawton, Boise, ID (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
In one aspect, the invention encompasses a method of using an image forming device. A first pattern of toner is provided on a photosensitive drum of the image forming device. The toner is transferred from the photosensitive drum to an intermediate transfer belt to form a second pattern. After forming the second pattern, a bias of the photosensitive drum is reversed relative to the intermediate transfer belt and toner is transferred back to the photosensitive drum from the intermediate transfer belt to form a third pattern of toner on the photosensitive drum. In another aspect, the invention encompasses a method of detecting inaccuracies in toner placement on an intermediate transfer belt of an image forming device. A first pattern of black, magenta, cyan and yellow toners is provided on a photosensitive drum of the image forming device. The toners are transferred from the photosensitive drum to an intermediate transfer belt of the image forming device to form a second pattern. Subsequently, and without transferring the toner from the intermediate transfer belt to a substrate processed by the image forming device, measuring at least one property of the second pattern to determine if the second pattern is an accurate reproduction of the first pattern.