Patents by Inventor Masao MUTAI

Masao MUTAI 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).

  • Internal heat exchanger and refrigeration cycle apparatus having the internal heat exchanger
    Patent number: 11873935
    Abstract: A double pipe forms an inner flow path, through which a low-pressure side refrigerant flows, inside an inner pipe, and forms an inner-outer flow path, through which a high-pressure side refrigerant flows, between the outer pipe and the inner pipe. It comprises an expansion valve side connector and a counter-expansion valve side connector which are interposed between distal ends of the outer pipe and the inner pipe and members to be connected. An outer diameter of the outer pipe is 30 millimeters or less. A ratio of a difference between an inner diameter of the outer pipe and an outer diameter of the inner pipe with respect to the inner diameter of the outer pipe is 25% or less. A sealing member is provided to prevent a refrigerant leakage. The plurality of members are mechanically fixed.
    Type: Grant
    Filed: February 19, 2021
    Date of Patent: January 16, 2024
    Assignees: DENSO AIR SYSTEMS CORPORATION, DENSO CORPORATION
    Inventors: Fumiaki Nakamura, Minoru Maruyama, Hideaki Inazawa, Masao Mutai, Kouichi Satou, Nobumichi Harada
  • INTERNAL HEAT EXCHANGER AND REFRIGERATION CYCLE APPARATUS HAVING THE INTERNAL HEAT EXCHANGER
    Publication number: 20210172684
    Abstract: A double pipe forms an inner flow path, through which a low-pressure side refrigerant flows, inside an inner pipe, and forms an inner-outer flow path, through which a high-pressure side refrigerant flows, between the outer pipe and the inner pipe. It comprises an expansion valve side connector and a counter-expansion valve side connector which are interposed between distal ends of the outer pipe and the inner pipe and members to be connected. An outer diameter of the outer pipe is 30 millimeters or less. A ratio of a difference between an inner diameter of the outer pipe and an outer diameter of the inner pipe with respect to the inner diameter of the outer pipe is 25% or less. A sealing member is provided to prevent a refrigerant leakage. The plurality of members are mechanically fixed.
    Type: Application
    Filed: February 19, 2021
    Publication date: June 10, 2021
    Inventors: Fumiaki NAKAMURA, Minoru MARUYAMA, Hideaki INAZAWA, Masao MUTAI, Kouichi SATOU, Nobumichi HARADA