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. 21, 1977
Filed:
Feb. 13, 1975
Applicant:
Inventor:
Gunter A Kohler, Grant Township, Washington County, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Int. Cl.
CPC ...
D01F / ;
U.S. Cl.
CPC ...
4234476 ; 81155 ; 4234477 ; 264 292 ;
Abstract
A method is disclosed for forming carbonaceous fibers from polyacrylonitrile fibers wherein the polyacrylonitrile is treated with an amine in a pressure vessel at an elevated temperature and an elevated pressure, oxidizing the amine treated polyacrylonitrile at an elevated temperature in an oxidizing atmosphere, and carbonizing the oxidized polyacrylonitrile by heating it at a temperature of at least 1000.degree. C.