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:
Jun. 13, 1978
Filed:
Dec. 21, 1976
Applicant:
Inventors:
Artur Botta, Krefeld, DT;
Anita VON Konig, Krefeld, DT;
Franz Moll, Leverkusen, DT;
Christian Rasp, Cologne, DT;
Johannes Hartl, Bechen, DT;
Assignee:
Agfa-Gevaert Aktiengesellschaft, Leverkusen-Bayerwerk, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01J / ; G03C / ;
U.S. Cl.
CPC ...
2523 / ; 96 8 / ; 106-119 ; 252300 ;
Abstract
The process for the preparation of silver dispersions for antihalation and filter layers in photographic material by reducing silver salts in the presence of a heterocyclic 5-membered or 6-membered compound which has a ##STR1## group in its 1,2,3-position and a 2-aminoalkyl or 2-hydroxyalkyl group or an alkylene chain which is linked through the 1- and 2-position. The process provides neutral grey silver dispersions without using cadmium salts, for the reduction of the silver salts.