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:
Apr. 10, 1979
Filed:
Jan. 12, 1977
Applicant:
Inventors:
Wulf von Bonin, Leverkusen, DE;
Erich Wolff, Leverkusen, DE;
Werner Krafft, Leverkusen, DE;
Gunther Matschke, Leverkusen, DE;
Assignee:
AGFA-Gevaert AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ; G03C / ; B44D / ;
U.S. Cl.
CPC ...
96 77 ; 96-3 ; 96 2 / ; 9611 / ; 428412 ; 428425 ; 428480 ; 428481 ; 428483 ;
Abstract
A restraining layer capable of retarding the diffusion of hydroxyl groups is of particular use in a neutralization system for the dye diffusion transfer process. The restraining layer of the invention comprises a film-forming linear polymer consisting of alternating hydrophilic and hydrophobic segments joined to one another by carbonate, urethane and/or ester groups. The neutralization system provides retarded reduction of pH in the photographic material.