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:
Mar. 05, 1991
Filed:
Apr. 10, 1989
Applicant:
Inventors:
Jerome E May, Rochester, NY (US);
Delmer G Parker, Rochester, NY (US);
Howard M Stark, Webster, NY (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ; G03G / ;
U.S. Cl.
CPC ...
355208 ; 355246 ; 355328 ; 430 45 ; 430122 ;
Abstract
In a tri-level imaging apparatus, a development control arrangement wherein the white discharge level is stabilized at a predetermined voltage and the bias voltages for the developer housings for charged area and discharged area development are independently adjustable for maintaining image background levels within acceptable limits. The white discharge level can be shifted to preferentially enhance the copy quality of one or the other of the charged area or discharged area images.