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:
Nov. 19, 1991
Filed:
Jun. 15, 1989
Applicant:
Inventor:
James T Paul, Jr, New Castle County, DE (US);
Assignee:
Hercules Incorporated, Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D01F / ;
U.S. Cl.
CPC ...
264 292 ; 264 297 ; 264 83 ; 2642107 ; 2642108 ; 26421115 ; 26421117 ;
Abstract
Process of carbon fiber manufacture wherein the polyacrylonitrile precursor is stretched prior to oxidation step of the carbonization operation but after the stretching step of the spinning operation in limited temperature range. Process permits greater throughput in precursor manufacture and reduces flaws in the precursor because significant stretching is at lower line speeds typically used for oxidation and carbonization in making carbon fiber.