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:
Feb. 02, 1993
Filed:
Jul. 02, 1991
Applicant:
Inventors:
Takao Miwa, Katsuta, JP;
Takayoshi Ikeda, Tohkai, JP;
Shunichi Numata, Hitachi, JP;
Koji Fujisaki, Hitachi, JP;
Hisae Shimanoki, Hitachi, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Chemical Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08K / ; C07D / ;
U.S. Cl.
CPC ...
524109 ; 549241 ;
Abstract
An acid dianhydride complex which is characterized in anti-hydrolysis, good stability, and high solubility in an organic solvent, is prepared by a reaction of a basic organic compound having a donor number of at least 20 and being free from an active hydrogen atom in the molecule and a carboxylic dianhydride compound.