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, 2005
Filed:
Nov. 14, 2003
Applicant:
Fridolin Bäbler, Teresópolis, BR;
Inventor:
Fridolin Bäbler, Teresópolis, BR;
Assignee:
Ciba Specialty Chemicals Corporation, Tarrytown, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D471/04 ; C07D471/06 ;
U.S. Cl.
CPC ...
Abstract
A novel method for the preparation of a beta quinacridone pigment is described by the oxidation of 6,13-dihydroquinacridone in the presence of polyvinyl pyrrolidone, a catalyst and optionally a particulate quinacridone or particle growth inhibitor using hydrogen peroxide as the oxidant.