Patents by Inventor Roger A. Colson

Roger A. Colson 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).

  • Piezoelectric device with high, constant preload force
    Patent number: 4460842
    Abstract: A piezoelectric device, comprising a number of polarizable ceramic plates 1 which are stacked with intermediate metal plates which serve as electrodes. The stack is subjected to a large amount of preload by a preloading element having a relatively flat spring-force characteristic over the piezoelectric operating range of the device which is formed by a cylindrical housing having two sets of parallel pairs of slots 7, 10, rotationally displaced by 90 degrees, the preloading force being applied to the stack by threaded end plugs 4 and 5. The ceramic plates are polarized only after assembly and preloading.
    Type: Grant
    Filed: December 6, 1982
    Date of Patent: July 17, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Jan W. Waanders, Herman F. van Heek, Roger A. Colson, David J. Perduijn