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. 08, 1983
Filed:
Mar. 03, 1981
Applicant:
Inventors:
Joseph G Robinson, Winchcombe, GB;
David I Barnes, Cheltenham, GB;
Assignee:
Coal Industry (Patents) Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528353 ; 4284735 ; 525472 ; 528220 ; 528229 ; 528233 ; 528247 ;
Abstract
A polyimide resin is made by converting a phanthrene to its 9, 10 diol derivative, reacting the derivative with formaldehyde to give a methylene bridged reaction product, oxidizing the reaction product to produce a polycarboxylated product, and reacting the polycarboxylated product with an aromatic diamine to form the polyimide resin. The invention also includes the resin, the reaction product and the polycarboxylated product. The resin will be useful as a lamp capping cement, a high temperature insulator, in copper clad printed circuit boards, in glass or asbestos laminates for use as compressor blades.