Patents by Inventor Hiroyasu Owada

Hiroyasu Owada 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).

  • Patent number: 5816783
    Abstract: An electrically driven hermetic compressor comprises a hermetic casing, an electric motor unit encased in the casing, and a compression mechanism encased by the casing and drivingly connected to the electric motor unit through a crankshaft. The compression mechanism includes a cylinder, a piston reciprocatingly slidable in the cylinder, a valve plate having formed therein a suction port and a discharge port and providing valve seats around the ports, suction valve and a discharge valve cooperating with the suction and discharge ports. The cylinder, the piston and the valve plate cooperate to define a compression chamber. The compressor further has a passage system providing separate passages for a gas to be compressed and the gas after compression, and a motion converting mechanism for converting rotary motion of the crankshaft into linear reciprocating motion of the piston.
    Type: Grant
    Filed: April 28, 1997
    Date of Patent: October 6, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Yasuhiro Oshima, Kenji Ogino, Hiromasa Uchida, Mitsuji Yamamoto, Kazuhiro Suzuki, Hiroyasu Owada