Patents Assigned to Tontech International Co., Ltd.
  • Automatic swimming board
    Patent number: 5158034
    Abstract: An automatic swimming board for a beginner to lie on for learning swimming or diving, has a transmitting unit to move forward the board by means of a motor powered by an electric power source for rotating fans, and a water pressure sensor and a pressure signal lamp to give a warning to the user about the depth limit when the board is used to dive in the water.
    Type: Grant
    Filed: February 24, 1992
    Date of Patent: October 27, 1992
    Assignee: Tontech International Co., Ltd.
    Inventor: Chi-Hsueh Hsu