Patents by Inventor Takayuki Izumi

Takayuki Izumi 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 mesophase pitch
    Patent number: 4533461
    Abstract: A substantially uniform mesophase pitch is prepared by treating a mesophase forming pitch material at elevated temperatures above about 380.degree. C. to produce a mixture of mesophase and non-mesophase pitch containing about 20% to about 80% mesophase. The mixture is then maintained at a temperature below about 400.degree. C. for a time sufficient to allow the mesophase to coalesce and settle as a lower separable layer. A mesophase pitch so produced may contain from 90 to 100% mesophase with a softening point of less than 320.degree. C.
    Type: Grant
    Filed: July 8, 1981
    Date of Patent: August 6, 1985
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Takayuki Izumi, Tsutomu Naito, Seiko Igarashi
  • Process for continuous production of optically anisotropic pitch
    Patent number: 4511456
    Abstract: A continuous process for producing an optically anisotropic pitch. A reaction tank is used to treat a starting material. An upper section is utilized for thermal decomposition polycondensation zone. A lower portion of the tank is used as a settling zone.
    Type: Grant
    Filed: February 17, 1983
    Date of Patent: April 16, 1985
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventor: Takayuki Izumi
  • 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
  • Process for producing optically anisotropic carbonaceous pitch
    Patent number: 4454019
    Abstract: A homogeneous, optically anisotropic pitch used for the production of carbon materials is prepared from a starting oil comprising a substantially chloroform-insoluble matter-free oily or tarry substance. The starting oil is subjected to thermal cracking and polycondensation to form approximately 20-80% of optically anisotropic phase pitch.
    Type: Grant
    Filed: January 11, 1982
    Date of Patent: June 12, 1984
    Assignee: Toa Nenryo Kogyo Kabushiki Kaisha
    Inventors: Takayuki Izumi, Tsutomu Naito, Tomoo Nakamura, Hisao Tanaka