Patents by Inventor Yasuo Matsumura

Yasuo Matsumura 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).

  • Process for producing carbon fibers
    Patent number: 3993719
    Abstract: Improved carbon fibers (including graphite fibers) are produced by drying acrylic fibers in a water-swollen state spun from an inorganic solvent solution of an acrylonitrile homopolymer or copolymer containing at least 85 mol % acrylonitrile and having an orientation degree of at least 50% and a water content of 5 to 150%. The drying step is carried out at a temperature below 70.degree. C to reduce the water content in said fibers to below 4%. The dried fibers are then heated to form the improved carbon fibers.
    Type: Grant
    Filed: January 31, 1975
    Date of Patent: November 23, 1976
    Assignee: Japan Exlan Company Limited
    Inventors: Yasuo Matsumura, Soichiro Kishimoto, Masahiko Ozaki
  • Process for producing carbon fibers
    Patent number: 3933986
    Abstract: A process for producing carbon fibers which comprises (a) treating preoxidized fibers produced from an acrylonitrile fiber with a reducing liquid containing a specific compound and (b) thereafter carbonizing or graphitizing the treated fibers at a temperature above 800.degree. C. The thus-obtained carbon or graphite fibers have a high tensile strength and a high modulus of elasticity.
    Type: Grant
    Filed: April 11, 1974
    Date of Patent: January 20, 1976
    Assignee: Japan Exlan Company Limited
    Inventors: Yasuo Matsumura, Soichiro Kishimoto, Masahiko Ozaki