Patents by Inventor Toshiharu Ohtsuka

Toshiharu Ohtsuka 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).

  • Combination faucet and method of mixing hot water with cold water
    Patent number: 5511723
    Abstract: A combination faucet compensates for a temperature deviation between a target temperature and actual temperature of a water mixture by utilizing a temperature-sensitive coil spring (80) to press a movable cylinder or axially elongated valve disc (70) that controls a mixing ratio of hot water to cold water. The temperature-sensitive coil spring (80) is constructed of a material that varies the spring constant of spring (80) according to a temperature change. When the temperature-sensitive coil spring (80) by itself cannot provide sufficient correction to compensate for the temperature deviation, feed-back control is utilized for completely eliminating the temperature deviation. To prevent hunting, control gain K of the feed-back control is determined according to variation in the spring constant of coil spring (80).
    Type: Grant
    Filed: July 22, 1994
    Date of Patent: April 30, 1996
    Assignee: Toto Ltd.
    Inventors: Toshio Eki, Toshiharu Ohtsuka