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:
Oct. 22, 2002
Filed:
May. 14, 2001
Applicant:
Inventors:
Gustav Tappe, Leverkusen, DE;
Wolfgang Körner, Leverkusen, DE;
Gerhard Schmid, Oberriexingen, DE;
Assignee:
Agfa-Gevaert N.V., , BE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C 7/413 ;
U.S. Cl.
CPC ...
G03C 7/413 ;
Abstract
A concentrated aqueous solution of a p-phenylenediamine derivative, which a) has a pH higher than 12.5, b) contains 0.4 to 1.1 mol p-phenylenediamine derivative/litre, c) contains 0.05 to 2 mol of an antioxidant/litre, d) contains at most 35% by weight of organic solvents with respect to the total solution, e) contains at most 50 mmol sulphate ions/litre and f) is single-phase, is suitable for the production of different colour developer formulations.