Patents by Inventor Tatsuaki Shimizu

Tatsuaki Shimizu 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).

  • Refrigerant circulating system
    Patent number: 5531080
    Abstract: A refrigerant circulating system that uses a highly polar refrigerant, as typified by a hydrofluorocarbon-based one, and a refrigerating oil that has slight solubility with a liquid refrigerant on the condensation side. Also, a refrigerant circulating cycle that uses a highly polar refrigerant, as typified by a hydrofluorocarbon-based one, and a refrigerating oil that has a slight solubility with a liquid refrigerant and which has a greater specific gravity than the liquid refrigerant. Thereby, it provides a high electrical insulation and moisture resistance, good oil return to the compressor, and high reliability.
    Type: Grant
    Filed: July 12, 1994
    Date of Patent: July 2, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takuho Hirahara, Susumu Kawaguchi, Tatsuaki Shimizu, Katsuyuki Kawasaki, Noboru Masuda, Shinobu Ogasawara, Hiroshige Konishi, Hitoshi Maruyama, Yoshihiro Sumida, Akemi Ueyama, Satoru Toyama, Sou Suzuki, Yasushi Akahori
  • Refrigeration device using hydrofluorocarbon refrigerant
    Patent number: 5419144
    Abstract: A method of assembling a closed loop refrigerating air conditioning system using a hydrofluorocarbon refrigerant by applying a first oil which is insoluble with the hydrocarbon refrigerant to components of a compressor, and storing the insoluble oil within the housing of the compressor in a single or mixed state.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: May 30, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama
  • Refrigeration device using hydrofluorocarbon refrigerant
    Patent number: 5355695
    Abstract: A refrigeration device comprising a compressor, a condenser, an evaporator, an accumulator and a refrigerant is described. Lubricating oil present in the compressor is chosen so as to be insoluble with the refrigerant, and a particular accumulator design is described to ensure return of oil back to the compressor.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: October 18, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Susumu Kawaguchi, Tatsuaki Shimizu, Hiroshige Konishi, Hitoshi Maruyama, Noboru Masuda, Shinobu Ogasawara, Yoshihiro Sumida, Satoru Toyama