Patents by Inventor Isao Fujikura

Isao Fujikura 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 coal-water slurry at high concentration
    Patent number: 4746325
    Abstract: A coal - water slurry at high concentration which has a low viscosity and favorable flowing property is prepared by using a surface active substance prepared by sulfonating and oxidizing at least one of the starting materials selected from distilled petroleum oils, petroleum pitches, asphalts, distilled coal oils, coal pitches or coals, applying condensation as required and then neutralizing the thus obtained product with alkalis.
    Type: Grant
    Filed: July 18, 1986
    Date of Patent: May 24, 1988
    Assignees: Fuji Oil Co., Ltd., Toho Chemical Industry Co., Ltd.
    Inventors: Yoshinobu Nakamura, Tadao Goto, Isao Fujikura, Yazaemon Morita, Shinichi Okada, Masao Inagaki