Patents by Inventor Tsutomu Kayama

Tsutomu Kayama 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).

  • Display board illuminating device for passive displays
    Patent number: 5070431
    Abstract: A display board illuminating device includes a light guide plate arranged to face the back of a display board and a light source disposed to face the side end of the light guide plate. The side end of the light guide plate is inclined toward the center of the light guide plate in the direction of the display board. By this configuration an angle of an optical axis refracted at the surface of the side end and incident into the light guide plate with respect to a main surface of the light guide plate, so that the whole area of the display board is illuminated efficiently.
    Type: Grant
    Filed: July 30, 1990
    Date of Patent: December 3, 1991
    Assignee: Pioneer Electronic Corporation
    Inventors: Hideki Kitazawa, Ryohei Terada, Shogo Takeuchi, Tsutomu Kayama, Kohichi Tanimoto, Nobuo Utsugi, Yoshiaki Nagai
  • Cold water supply system
    Patent number: 4502289
    Abstract: A cold water supply system includes an agitator tank in a cold water supply tank for receiving the cold water from a refrigerating units and a bypass pipe line for directing a calculated amount of return water from the load into the agitator tank. A temperature sensor for sensing the return water temperature is provided and another temperature sensor for sensing the refrigeration unit outlet temperature is provided for controlling regulating means in accordance with the sensed temperatures for automatically regulating the cold water temperature supplied into the agitator tank to a predetermined temperature.
    Type: Grant
    Filed: August 1, 1983
    Date of Patent: March 5, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Tsutomu Kayama