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. 31, 1992
Filed:
Aug. 30, 1990
Applicant:
Inventor:
Eiichi Tanabe, Kanagawa, JP;
Assignee:
Fuji Xerox Co., Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
358461 ; 358494 ; 358496 ; 358498 ;
Abstract
In a shading correction device of an image reading machine, for example, a Xerography unit or a thermal transfer unit, a platen roller is provided so as to engage and disengage from a platen glass. A reference white color member is provided. The reference white color member is movable up to a position between the platen glass and the platen roller along the circumferential side of the platen roller and with rotation of the platen roller.