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. 14, 1989
Filed:
Apr. 08, 1987
Albert V Buettner, Rochester, NY (US);
Carl E Cowan, Pittsford, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An improvement in the method and apparatus for producing a multi-color electrophotographic image wherein an electrophotographic medium can be used for multiple charge-expose cycles without the accumulation of trapped charges which can result in an increase in toe voltage. The invention provides for the charging, exposing and toning of the medium to produce a first color visible image. The carrier is then returned to the first position to repeat the foregoing steps to charge, expose and tone to produce a second color visible image. Prior to the second charging step the medium is reverse charged and trapped charges are neutralized to substantially revitalize the medium to a condition closely resemblng its unused condition to substantially eliminate the rise in toe voltage.