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. 12, 1991
Filed:
Sep. 16, 1986
Applicant:
Inventors:
Stephen P Krupp, Lake Jackson, TX (US);
Scott L Gessner, Vancouver, WA (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D01F / ;
U.S. Cl.
CPC ...
264 292 ; 264 296 ; 264 83 ; 2642103 ; 2642107 ; 2642108 ; 26421111 ; 26421115 ; 4234477 ;
Abstract
A fiber made of pitch having a percent elongation of about 2 percent or greater is made by melt spinning an optically isotropic pitch to form a fiber typically in the range of about 5 to about 50 microns diameter, treating the fiber with an oxidizing atmosphere, subsequently removing a certain portion of the oxidant thereby reducing the weight of the fiber, with the optional post-treatment step of repetitively stretching in the elastic range short of breakage to increase the percent elongation.