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. 01, 1994
Filed:
Apr. 30, 1992
Applicant:
Inventors:
Roger W Nelson, Fairport, NY (US);
Edward G Bourne, Penfield, NY (US);
Assignee:
Eastman Kodak Company, Rochester, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430600 ; 430603 ; 430605 ;
Abstract
The invention is generally accomplished when a heavy metal compound and a substituted thiourea sensitizer are used together as chemical sensitizers. There is a surprising increase in photographic efficiency and, therefore, in photographic sensitivity. This effect does not depend on the presence of a dye. The preferred heavy metal compound is potassium hexachloroiridate (IV), and the preferred thiourea is 3-acetamidophenyl thiourea.