Patents by Inventor Yohji Matsuhisa

Yohji Matsuhisa 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).

  • Ultrahigh strength carbon fibers
    Patent number: 4637925
    Abstract: An ultrahigh strength carbon fiber having a surface layer having a crystalline completeness which is substantially the same as or higher than that of the central region of the fiber, and a functional group amount ratio (O.sub.ls /C.sub.ls) of 0.1 to 0.4 as detected in the fiber surface by X-ray photoelectron spectroscopy, the surface layer preferably having an ultrathin outermost layer having a lower crystalline completeness than the central region of the fiber.
    Type: Grant
    Filed: April 23, 1986
    Date of Patent: January 20, 1987
    Assignee: Toray Industries, Inc.
    Inventors: Tohru Hiramatsu, Yohji Matsuhisa, Tomitake Higuchi
  • Ultrahigh strength carbon fibers
    Patent number: 4600572
    Abstract: An ultrahigh strength carbon fiber having a surface layer having a crystalline completeness which is substantially the same as or higher than that of the central region of the fiber, and a functional group amount ratio (O.sub.ls /C.sub.ls) of 0.1 to 0.4 as detected in the fiber surface by X-ray photoelectron spectroscopy, the surface layer preferably having an ultrathin outermost layer having a lower crystalline completeness than the central region of the fiber.
    Type: Grant
    Filed: June 20, 1985
    Date of Patent: July 15, 1986
    Assignee: Toray Industries, Inc.
    Inventors: Tohru Hiramatsu, Yohji Matsuhisa, Tomitake Higuchi
  • Ultrahigh strength carbon fibers
    Patent number: RE33537
    Abstract: An ultrahigh strength carbon fiber having a surface layer having a crystalline completeness which is substantially the same as or higher than that of the central region of the fiber, and a functional group amount ratio .[.(O.sub.ls /C.sub.ls).]. .Iadd.(O.sub.1s /C.sub.1s) .Iaddend.of 0.1 to 0.4 as detected in the fiber surface by X-ray photoelectron spectroscopy, the surface layer preferably having an ultrathin outermost layer having a lower crystalline completeness than the central region of the fiber.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: February 12, 1991
    Assignee: Toray Industries, Inc.
    Inventors: Tohru Hiramatsu, Yohji Matsuhisa, Tomitake Higuchi