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. 30, 1978
Filed:
Jul. 26, 1976
Applicant:
Inventors:
James C Fletcher, , US;
Edward S Harrison, San Diego, CA (US);
Chadwick B Delano, Sunnyvale, CA (US);
Salvatore R Riccitiello, San Jose, CA (US);
Assignee:
Other;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C08V / ;
U.S. Cl.
CPC ...
260 / ; 260 / ; 260 / ; 260 7841 ;
Abstract
Foamed cross-linked poly-N-arylenebinzimidazoles are prepared by mixing an organic tetraamine and an ortho substituted aromatic dicarboxylic acid anhydride in the presence of a blowing agent and then heating the prepolymer to a temperature sufficient to complete polymerization and foaming of the reactants. In another embodiment of the process, the reactants are heated to form a prepolymer. The prepolymer is then cured at higher temperatures to complete foaming and polymerization.