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. 14, 1977
Filed:
Jan. 14, 1976
Applicant:
Inventors:
Hiroshi Iwata, Ohtake, JA;
Mikio Yoshida, Ohtake, JA;
Assignee:
Mitsubishi Rayon Co., Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428212 ; 428288 ; 428296 ; 428474 ; 428910 ;
Abstract
A novel heat resistant sheet having excellent varnish impregnability, a high dielectric strength and a high physical strength is obtained by pressing and heating a mixed web of wholly-aromatic polyamide fibers [A] having tan .delta. (max) .gtoreq. 0.25 and Es < 130 g/d and wholly-aromatic polyamide fibers [B] having tan .delta. (max) .ltoreq. 0.2 and Es .gtoreq. 130 g/d under such conditions as said fibers [A] being heat fused.