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:
Oct. 08, 1991
Filed:
Oct. 30, 1989
Applicant:
Inventors:
Akihiro Sasaki, Hitachi, JP;
Tohru Kikuchi, Hitachi, JP;
Assignee:
Hitachi Chemical Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
549214 ;
Abstract
1,3-Bis(dicarboxyphenyl)-1,1,3,3-tetraphenyldisiloxane derivatives useful as raw materials of polyimide resins, hardeners for epoxy resins and others and process for producing these derivatives, and polyamic acid and polyamic acid ester, and polyimide resins and processes for producing them from said disiloxane derivatives. The polyimide resins are good in properties such as adhesion to silicon substrates, heat resistance and mechanical properties.