Patents by Inventor Toshihisa Nishikawa

Toshihisa Nishikawa 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).

  • Method for producing carbon fiber
    Patent number: 5595720
    Abstract: A method for producing carbon fiber comprising applying an infusibilization to a pitch fiber yarn made using mesophase pitch as a starting material in a state with substantially no tension applied to the yarn and in an oxidizing gas atmosphere including nitrogen dioxide and oxygen, then sintering in an inert gas atmosphere of 350.degree. C. to less than 400.degree. C. for 10 minutes or more for primary carbonization, then applying secondary carbonization at a temperature of 800.degree. to 1300.degree. C. for 5 to 120 seconds, while feeding out the yarn in the linear form and continuously transporting the same.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: January 21, 1997
    Assignees: Nippon Steel Corporation, Nippon Steel Chemical Co., Ltd.
    Inventors: Yutaka Arai, Kunio Miura, Toshihisa Nishikawa, Mitsuaki Matsumoto