Patents by Inventor Hideo Umetsu

Hideo Umetsu 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).

  • Uninflammable dynamoelectric machine having coil windings and core encapsulated with unsaturated polyester resin-filler composition
    Patent number: 4387311
    Abstract: In a dynamoelectric machine having a stator assembly of coil windings and a core, a heat-dissipating, uninflammable, electro-insulative housing encapsulates the coil windings and the core. The housing is made of a cured molded article or material formed of a resin-filler composition which comprises a liquid unsaturated polyester resin, a finely divided calcium carbonate powder, an inorganic mineral particulate having a particle size larger than that of the calcium carbonate powder, a chopped glass fiber and an aluminum hydroxide powder, wherein the ratio by weight of the calcium carbonate to the mineral particulate is 0.3 to 4, the ratio of the weight of glass fiber to the total weight of the composition is 0.05 to 0.25, the ratio of the weight of the polyester resin to the total weight of the composition is 0.1 to 0.4, the weight ratio of the calcium carbonate powder, the mineral particulate and the glass fiber to the total weight of the composition is 0.15 to 0.
    Type: Grant
    Filed: March 25, 1981
    Date of Patent: June 7, 1983
    Assignee: Hitachi, Ltd.
    Inventors: Tsuguo Kobayashi, Tetsuo Ishikawa, Kenichi Hironaka, Hideo Umetsu, Masatsugu Ogata, Hitoshi Yokono