Patents by Inventor Seikoh Igarashi

Seikoh Igarashi 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 a homogeneous low softening point, optically anisotropic pitch
    Patent number: 4454020
    Abstract: A process for producing optically anisotropic pitch containing 80% or more of an anisotropic phase. A starting material is pyrolytically polycondensed. Afterward, the material is maintained at a temperature of between 350.degree. and 400.degree. C. to precipitate a portion of the material rich in the anisotropic phase having a high specific gravity. This portion is separated and further heat treated.
    Type: Grant
    Filed: February 17, 1983
    Date of Patent: June 12, 1984
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Takayuki Izumi, Tsutomu Naito, Seikoh Igarashi