Patents Assigned to Research Development Cooperation of Japan
  • Frost sensor
    Patent number: 4404852
    Abstract: A frost sensor for detecting the presence of frost uses an acoustic device having an acoustic transmitting medium made of a magnetostrictive material, particularly an amorphous metal alloy, of a ribbon shape, as means for detecting the frost.
    Type: Grant
    Filed: June 24, 1981
    Date of Patent: September 20, 1983
    Assignees: Hitachi, Ltd., Hitachi Metals, Ltd., Research Development Cooperation of Japan
    Inventor: Norio Goto