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. 11, 2003
Filed:
Feb. 06, 1997
Photographic bleaching solution containing organic phosphorus acid anti-rust agent and method of use
Applicant:
Inventor:
David G. Foster, West Henrietta, NY (US);
Assignee:
Eastman Kodak Company, Rochester, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C 7/42 ;
U.S. Cl.
CPC ...
G03C 7/42 ;
Abstract
An effective, biodegradable photographic bleaching solution comprises, as a bleaching agent, a ferric alkyliminodiacetic acid complex, and a particular organic phosphonic or phosphinic acid as an anti-rust agent. This anti-rust agent reduces or eliminates the formation of iron hydroxide in the processing solutions following the bleaching step, and further improves bleaching effectiveness.