Patents by Inventor Fumitake Umezaki

Fumitake Umezaki 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).

  • Air conditioning apparatus
    Patent number: 9739513
    Abstract: An air-conditioning apparatus detects refrigerant leak with high-accuracy even in a state in which an excessive liquid refrigerant is stored in an accumulator. The air-conditioning apparatus determines that leakage of refrigerant has occurred from a refrigerant circuit in an operating state in which an excessive liquid refrigerant is stored in an accumulator, after a part of the excessive liquid refrigerant stored in the accumulator is moved and stored into a condenser, with the excessive liquid refrigerant remaining in the accumulator as a reference amount, when the excessive liquid refrigerant is less than the reference amount.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: August 22, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yasutaka Ochiai, Fumitake Umezaki, Kosuke Tanaka
  • AIR CONDITIONING APPARATUS
    Publication number: 20130067942
    Abstract: An air-conditioning apparatus detects refrigerant leak with high-accuracy even in a state in which an excessive liquid refrigerant is stored in an accumulator. The air-conditioning apparatus determines that leakage of refrigerant has occurred from a refrigerant circuit in an operating state in which an excessive liquid refrigerant is stored in an accumulator, after a part of the excessive liquid refrigerant stored in the accumulator is moved and stored into a condenser, with the excessive liquid refrigerant remaining in the accumulator as a reference amount, when the excessive liquid refrigerant is less than the reference amount.
    Type: Application
    Filed: June 23, 2010
    Publication date: March 21, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yasutaka Ochiai, Fumitake Umezaki, Kosuke Tanaka