Patents by Inventor Mamoru Kamishita

Mamoru Kamishita 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 of producing precursor pitches for carbon fibers
    Patent number: 4758326
    Abstract: A method of producing a precursor pitch suitable for the production of carbon fibers, which method includes dissolving a coal tar pitch in a particular solvent to remove a solvent insoluble matter, distilling off the solvent to obtain a purified pitch containing no free carbon, and heat-treating the purified pitch to obtain an objective precursor pitch.
    Type: Grant
    Filed: November 12, 1986
    Date of Patent: July 19, 1988
    Assignees: Kawasaki Steel Corporation, Nitto Boseki Co., Ltd.
    Inventors: Yukihiro Ohsugi, Kozo Yudate, Mamoru Kamishita
  • Method of producing a precursor pitch for carbon fiber
    Patent number: 4589975
    Abstract: A method of producing a precursor pitch for use in the production of carbon fibers, which comprises hydrogenating a soft or middle tar pitch to obtain a hydrogenated pitch containing no free carbon and high molecular weight components and then subjecting it to a heat treatment. In this method, the hydrogenation is carried out in the presence of tetralin at a temperature of 400.degree.-450.degree. C., and the heat treatment after the removal of solvent insoluble components and solvent is carried out in an inert gas atmosphere at a temperature of 450.degree.-500.degree. C. and under a reduced pressure of 0.1-10 Torr.
    Type: Grant
    Filed: December 27, 1984
    Date of Patent: May 20, 1986
    Inventors: Kozo Yudate, Yukihiro Ohsugi, Mamoru Kamishita, Ken Nagasawa