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:
Jul. 11, 1978
Filed:
Jan. 17, 1977
Applicant:
Inventor:
Robert Jarl North, Elmwood Park, NJ (US);
Assignee:
Harmon Colors Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
1062 / ; 2602 / ;
Abstract
A method is provided for the production of gamma quinacridone solid solutions which comprises ring-closing a mixture comprising 80-99 weight percent of dianilinoterephthalic acid and 1-20 weight percent of di(ortho-substituted) anilinoterephthalic acid, 4,11-disubstituted quinacridone, or mixtures thereof, and drowning the product into a water miscible alcohol containing from 1 to 3 carbon atoms.