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. 21, 1992
Filed:
Jul. 16, 1990
Applicant:
Inventors:
David E Brown, St. Paul, MN (US);
Gregory L Zwadlo, Ellsworth, WI (US);
Assignee:
Minnesota Mining & Manufacturing Company, Saint Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
355219 ; 355218 ; 430 54 ; 430 58 ;
Abstract
An electrical charging system for repeatedly electrically charging a photoconductor layer on an electrical conductor through charging that photoconductor layer, selectively discharging it, providing toner on the layer, and removing the charge image in the photoconductor for each of as many toners as desired for forming a final printed image, followed by using a removal radiation of a shorter wavelength on the photoconductor to avoid long term changes in the photoconductor. A further charging cycle may be used before the next printed image operation begins.