Patents by Inventor Dick Bruijn

Dick Bruijn 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).

  • Hydrophone with compensation for statical pressure and method for pressure wave measurement
    Patent number: 6122225
    Abstract: Device (20) for measuring pressure waves in a liquid medium (E), comprising; one or more sensor elements (23) permeable to optical radiation; one or more support members (22) on which a sensor element (23) is arranged in each case and which is at least slightly flexible; a chamber (25) at least partly enclosed by a support member (22) and filled with the liquid medium; and a second compensation chamber (27) which is actively coupled to the first compensation chamber via an at least partially flexible wall (26), wherein the second compensation chamber is filled with gas; and detection means for detecting changes in the length of the sensor element.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: September 19, 2000
    Inventors: Lun Kai Cheng, Dick Bruijn