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. 22, 2000
Filed:
May. 01, 1998
Applicant:
Inventors:
Erich Wolff, Solingen, DE;
Peter Bergthaller, Bergisch Gladbach, DE;
Assignee:
Agfa-Gevaert NV, Mortsel, BE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
546334 ; 546330 ;
Abstract
Hardeners for photographic materials, the binders of which substantially consist of gelatine, wherein the hardeners are carbamoylpyridinium salts, the amine components of which are derived from secondary amines, which amines are converted into photographically inert products by an intramolecular cyclisation reaction, improve photographic properties, even when the material is stored under extreme conditions.