Patents by Inventor Tadayoshi Ubakata

Tadayoshi Ubakata 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).

  • Control device for a variable displacement compressor in an air conditioning system
    Patent number: 4498311
    Abstract: A control device is disclosed for controlling the operation of a variable displacement compressor in an air conditioning or refrigerating system. The compressor includes a variable displacement device for changing the cooling capacity of the compressor and a magnetic clutch which operates the compressor in response to an external drive mechanism. The control device controls the operation of the magnetic clutch in response to a comparison of the temperature of the cool air generated by the evaporator of the air conditioning system and a first predetermined temperature. When the temperature is above the first predetermined temperature, the compressor is operated to lower the temperature. The control device also controls the operation of the variable displacement device in the compressor. The control device operates to increase the cooling capacity of the compressor in response to a comparison of the temperature of the cool air with a second predetermined temperature.
    Type: Grant
    Filed: March 7, 1983
    Date of Patent: February 12, 1985
    Assignee: Sanden Corporation
    Inventors: Riichi Sakano, Tadayoshi Ubakata