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:
Mar. 08, 1983
Filed:
Aug. 03, 1981
Applicant:
Inventor:
Helmut Haseler, Leverkusen, DE;
Assignee:
Agfa-Gevaert AG, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
564438 ; 564437 ;
Abstract
A new process for the purification of photographic developer compounds using an anionic surfactant wherein unwanted impurities are removed either by being precipitated or dissolved. In this process the developer substance is freed from difficult to remove impurities.