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. 16, 1992
Filed:
Aug. 23, 1991
Applicant:
Inventor:
Koji Okada, Ohtsu, JP;
Assignee:
Kanegafuchi Kagaku Kogyo Kabushiki Kaisha, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
549241 ; 549 60 ;
Abstract
Tetracarboxylic acid anhydrides represented by the following formulae [IA] and [IB] are provided: ##STR1## where n is an integer of 1 to 3. The tetracarboxylic acid anhydrides give polyimides having low thermal expansion, low dielectric constant and low hygroscopicity.
Okada, Koji. (1992). Tetracarboxylic acid dianhydrides (U.S. Patent No. 5122617). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5122617
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile