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. 20, 1993
Filed:
Dec. 13, 1991
Applicant:
Inventors:
Toshimitsu Ikegaya, Tokyo, JP;
Yusaku Ide, Tokyo, JP;
Tsuneo Kawamura, Tokyo, JP;
Michichika Hikosaka, Tokyo, JP;
Assignee:
Toyo Ink Manufacturing Co., Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
540141 ; 106410 ; 106412 ; 540144 ;
Abstract
A process for the preparation of a copper phthalocyanine pigment, which comprises dry grinding crude copper phthalocyanine, treating the dry ground crude copper phthalocyanine with an aqueous solution of a mineral acid under such conditions of acid concentration and temperature as not to transform the .beta. form contained in the ground crude copper phthalocyanine into the .alpha. one to thereby carry out the pigmentation and removing the mineral acid from the resulting mixture.