Patents by Inventor Tetuya Okabe

Tetuya Okabe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Preoxidized fiber and process for producing the same
    Patent number: 4536448
    Abstract: A preoxidized fiber suitable for producing carbon fiber, comprising preoxidizing an acrylic fiber having thereon an ammonium salt of a fatty ester represented by formula [A] and [B] ##STR1## wherein R.sub.1 is an aliphatic hydrocarbon group having from 11 to 17 carbon atoms; R.sub.2 and R.sub.3 can each be hydrogen, a lower alkyl group, a hydroxyethyl group, or an hydroxyisopropyl group; and X.crclbar. is an anion.The preoxidized fiber produced from the acrylic fiber has very little coalescence, and therefore high-strength carbon fiber can be obtained from this preoxidized fiber.
    Type: Grant
    Filed: September 8, 1983
    Date of Patent: August 20, 1985
    Inventors: Hiroyasu Ogawa, Tetsuro Shigei, Hayashi Takahashi, Tetuya Okabe, Fumio Miyatake