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:
May. 05, 1987
Filed:
Nov. 25, 1985
Applicant:
Inventor:
Edwin K Shenk, Westford, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358169 ; 358168 ; 358284 ;
Abstract
A contrast control circuit for use in an electronic image printing system for adjusting the contrast of an analog electronic image information signal without changing the maximum and minimum brightness levels thereof in order to maintain the exposure of a photosensitive material such as photographic film within its determined range of sensitivity.