Patents by Inventor Hisao Futaki

Hisao Futaki 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).

  • Defrosting apparatus
    Patent number: 4432211
    Abstract: A defrosting apparatus for removing frost deposited on a cooler of a refrigerator or an air conditioner employs a defrosting heater exhibiting a positive temperature coefficient of resistance which changes sharply at a specific temperature. A specific rate of change of the heater current of the defrosting heater is detected, and on the basis of the detected current change rate, stopping or starting of current supply to the defrosting heater is controlled. The defrosting heater is an organic type heater or an inorganic ceramic type heater possessing the function of self-temperature control.
    Type: Grant
    Filed: November 9, 1981
    Date of Patent: February 21, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Tetsu Oishi, Makoto Oda, Hisao Futaki