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. 07, 1983
Filed:
Dec. 14, 1981
Applicant:
Inventor:
Patrick H Fitzgerald, Pitman, NJ (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
1062 / ; 106309 ;
Abstract
Premilled semichloro copper phthalocyanine or partially sulfonated semichloro copper phthalocyanine is slurried and stirred with sulfuric acid (50-60% and preferably 55-59% in the case of semichloro copper phthalocyanine and 50-61% and preferably 58-61% in the case of partially sulfonated semichloro copper phthalocyanine) at 50.degree.-85.degree. C., preferably 65.degree.-75.degree. C. for 1/2 to 4 hours. The slurry is diluted with to less than 35% sulfuric acid concentration and stirred at 60.degree.-95.degree. C. for 1/2 to 4 hours. The resulting highly transparent pigment is filtered and dried.