Patents by Inventor Yukiyosi Ogawa

Yukiyosi Ogawa 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 preparing a raw material for the manufacture of needle coke
    Patent number: 4127472
    Abstract: In mixing coal tar and/or coal tar pitch with aromatic and aliphatic solvents at atmospheric pressure and at a temperature between 15.degree. C and 140.degree. C to prepare a raw material for the manufacture of needle coke, the mixing ratio of the aromatic and aliphatic solvents and their quantities of addition to the coal tar and/or coal tar pitch are adjusted so that insoluble substances precipitate in a pitch zone. A supernatant obtained by separating the insoluble substances is distilled, and hydrocarbons consisting substantially of aromatic compounds and freed of the insoluble substances are obtained. Then the hydrocarbons are used as the raw material for the manufacture of needle coke.
    Type: Grant
    Filed: November 22, 1977
    Date of Patent: November 28, 1978
    Assignee: Nittetsu Chemical Industrial Co., Ltd.
    Inventors: Wataru Migitaka, Hirofumi Sunago, Yukiyosi Ogawa, Takanori Nisihata