Patents by Inventor Hak-Su Chang

Hak-Su Chang 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).

  • Method and device for simultaneously measuring the flow speed and the depth of a river
    Patent number: 5531125
    Abstract: A method and a device for simultaneously measuring the flow speed and the depth of a river is provided. The method and the device use ultrasonic wave to measure average flow speeds at a plurality of points in the water flow of a river to measure the flow rate of the river. The device comprises a vertical rod (7), and inclined rod (9), a vertical rod cylinder (8) movable up and down along the vertical rod, an inclined rod cylinder (10), through which the inclined rod can move, installed at an axis fixed perpendicular to the vertical rod cylinder (8), an angle sensor (15) measuring the angle between the vertical rod (7) and the inclined rod (9), support rods (14) installed at said axis and the ends of the vertical rod and the inclined rod (9) opposite to said axis, ultrasonic vibrators (4, 4', 6, 6') installed at the ends of said support rods (14) spaced from the vertical rod and the inclined rod, a level (11) attached to the top of the vertical rod (7), and a calculating part (16).
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: July 2, 1996
    Assignee: Korea Institute of Science and Technology
    Inventors: Kyu-Hong Ahn, Hak-Su Chang