Patents by Inventor Akira Shinzawa

Akira Shinzawa 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).

  • Fire-retardant electric device
    Patent number: 4812262
    Abstract: An electric device particularly adapted for a fire retardant oil-filled transformer, comprising a cellulose-based insulating material impregnated with an insulating oil composed of 100 parts by weight of an ester of a polyol with a fatty acid having a fire point of 300.degree. C. or above and, incorporated therein, 0.005 to 1.0 part by weight of a phenolic compound having no alkyl groups as the substituent at the ortho positions and 0.01 to 2.0 parts by weight of an epoxy compound.
    Type: Grant
    Filed: January 22, 1988
    Date of Patent: March 14, 1989
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Akira Shinzawa, Yoshiki Kohno
  • Flame-retardant electrical insulating oil composition
    Patent number: 4566994
    Abstract: A flame-retardant electrical insulating oil composition comprising 100 parts by volume of the insulating oil and 5 to 80 parts by volume a halogen-containing phosphoric ester.
    Type: Grant
    Filed: June 6, 1983
    Date of Patent: January 28, 1986
    Assignee: Nippon Oil Co., Ltd.
    Inventors: Hiroshi Hasegawa, Akira Shinzawa, Yoshiki Kohno