Patents by Inventor Shin-ichi Nayuki

Shin-ichi Nayuki 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 high strength, high modulus mesophase-pitch based carbon fibers
    Patent number: 4898723
    Abstract: A method for producing mesophase pitch based carbon fibers which enables to produce high strength high modulus carbon fibers at a relatively low temperature with stabilized production manner. This method comprises carbonizing infusibilized fibers, in an inert atmosphere under no tension state or a tension of 1 mg/denier or less in the first stage to give a specified interlayer spacing and a crystallite thickness and then carbonizing under a tension of 50-300 mg/denier at a temperature of 2600.degree. C. or more in the second stage.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: February 6, 1990
    Assignee: Petoca Ltd.
    Inventors: Yoshinori Suto, Toshiyuki Ito, Hideyuki Nakajima, Keiichiro Okamura, Shin-ichi Nayuki, Hiroyasu Ogawa, Harumitsu Enomoto
  • Method for producing high strength, high modulus mesophase-pitch-based carbon fibers
    Patent number: 4892722
    Abstract: A method for producing high strength, high modulus carbon fibers having a modulus of elasticity of 75 tonf/mm.sup.2 or more and a tensile strength of 250 kgf/mm.sup.2 or more is provided. This method comprises graphitizing mesophase-pitch-based carbon fibers at a temperature of 2600.degree. C. or more for several seconds or for several minutes while stretching said fibers with a stretching ratio which satisifies specified relations.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: January 9, 1990
    Assignee: Petoca Ltd.
    Inventors: Yoshinori Suto, Toshiyuki Ito, Hideyuki Nakajima, Yoshiyuki Suzuki, Shin-ichi Nayuki, Hiroyasu Ogawa, Harumitsu Enomoto