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. 29, 1980
Filed:
Feb. 14, 1979
Kosuke Katsuki, Ehime, JP;
Shizuo Watanabe, Ehime, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
Disclosed is an improvement in a process for producing oxidized fibers wherein precursor fibers comprised of oxidizable continuous filaments are repeatedly brought into or out of contact with the surface of a heated body, maintained at a temperature of from approximately 200.degree. to 400.degree. C., in an oxidizing gaseous atmosphere thereby to be oxidized. The oxidized fibers can then be heated in a non-oxidizing gaseous atmosphere maintained at a temperature of at least approximately 800.degree. C. to produce carbon fibers, if desired. The improvement resides in that an interlaced filament yarn is used as the precursor fibers, which yarn substantially has no crimps or loops and is comprised of continuous filaments entangled with each other along the longitudinal direction thereof to an extent such that the coherency factor of the yarn is in the range of from approximately 20 to 100.