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:
May. 15, 1979
Filed:
Aug. 31, 1976
Martin B Sheratte, Canoga Park, CA (US);
Acurex Corporation, Mountain View, CA (US);
Abstract
A polybenzimidazole having a polymer chain with the following repeating unit: ##STR1## R.sub.2 is a divalent carbon ring with the linkage to an adjacent repeating unit through adjacent carbon atoms of the ring. Such polybenzimidazoles are formed by the condensation of (a) a substitute carbon ring compound, having at least one dicarboxylic anhydride or its equivalent substituted at adjacent carbon atoms and (b) an organic tetraamine of the following formula: ##STR2## Polybenzimidazoles of the foregoing type may be formed by the use of a tetracarboxylic dianhydride in the condensation reaction. These cross-linked polymers are characterized by minimal softening or burning at high temperature.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile