Patents by Inventor Kazuyoshi Mitamura

Kazuyoshi Mitamura 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).

  • Lubricant
    Patent number: 4396516
    Abstract: This invention is a lubricant comprising an imide compound obtained by reacting a dibasic acid selected from the group consisting of succinic acid, maleic acid, glutaric acid and phthalic acid with a primary amine having a C.sub.8 -C.sub.18 hydrocarbon radical.The lubricant of the invention may be used in combination with a specified diamine derivative and known lubricant additives, and exhibits excellent lubricating properties.
    Type: Grant
    Filed: June 9, 1981
    Date of Patent: August 2, 1983
    Assignee: Nippon Oil Company, Ltd.
    Inventors: Hirotsugu Kinoshita, Hiroshi Uemura, Makoto Sekiya, Kazuyoshi Mitamura
  • Water-soluble polymers derived from copolymerization of diene and maleic acid or maleic acid derivative and aqueous quenching fluids prepared therefore
    Patent number: 4090891
    Abstract: Water-soluble polymers derived from the copolymerization of a conjugated diene and maleic acid and/or a maleic acid derivative having certain anionic and cationic components are disclosed. When dissolved in aqueous media, the polymers are useful as quenching agents for metals.
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: May 23, 1978
    Assignee: Nippon Oil Company Limited
    Inventors: Kazuyoshi Mitamura, Hiroyuki Itoh