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:
Sep. 11, 1979
Filed:
Feb. 01, 1978
Applicant:
Inventor:
Yu-Tsai Chen, Glen Ellyn, IL (US);
Assignee:
Standard Oil Company (Indiana), Chicago, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528481 ; 528188 ; 528350 ; 528352 ; 528353 ;
Abstract
Process for heat treating a shaped article of polyamide-imide or polyamic acid comprising preheating the article to remove a major portion of volatiles contained in the article and generated therein and to increase the polymer's deflection temperature by about 15 to about 35.degree. F. without deformation of the article, and heating the article at about 5.degree. to about 25.degree. F. below the increased deflection temperature to progressively increase the polymer's deflection temperature to substantially its maximum attainable value without deformation, said preheating and heating being carried out in the presence of a circulating gas.