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. 03, 1991
Filed:
Apr. 03, 1989
Applicant:
Inventors:
Assignee:
Kuraray Co., Ltd., Kurashiki, JP;
Primary Examiner:
Int. Cl.
CPC ...
D01D / ; D01F / ;
U.S. Cl.
CPC ...
264 83 ; 264 85 ; 26421115 ; 26421117 ; 264234 ; 264345 ;
Abstract
A process for producing aromatic polyester fibers having a high strength and resistances to fibrillation, buckling, abrasion and fatigue. The process comprises spinning aromatic polyesters capable of forming anisotropic melts and heat treating the as-spun fibers, the heat treatment being characterized by a combination of a first heat treatment in an inert atmosphere and a successive heat treatment in an active atmosphere.