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. 04, 1978
Filed:
Nov. 22, 1972
Applicant:
Inventors:
Clifford H Griffiths, Penfield, NY (US);
Richard C Keezer, Los Altos, CA (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
2603145 ;
Abstract
A method for the preparation of X-form metal-free phthalocyanine and X-form metal-free compounds which comprises heating any metal-free phthalocyanine polymorph or compound to from about 540.degree. to about 580.degree. C and cooling the resulting product formed thereby is herein disclosed.