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:
Jan. 15, 1980
Filed:
Dec. 06, 1977
Applicant:
Inventor:
Robert R Luise, Wilmington, DE (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264345 ; 2641 / ; 2641 / ; 2643 / ; 264347 ; 528191 ; 528309 ;
Abstract
Fibers with enhanced tenacity are prepared by heat treating oriented fibers from anisotropic-melt-forming linear aromatic and cycloaliphatic polymers, especially polyesters (including copolyesters), while said fibers are essentially relaxed, at temperatures near the flow temperature but sufficiently below to prevent substantial interfilament fusion, for a period of from five seconds to several hours until the fiber tenacity is increased by at least 50% and to at least 10 grams per denier.