Patents by Inventor Kris J. Nygaard

Kris J. Nygaard 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 apparatus for controlled modification of fluid flow
    Patent number: 5040560
    Abstract: Substantial alteration of the flow conditions in a fluid stream are effected by the application of controlled disturbances to the boundary of or within the stream by one or more piezoelectric actuators. The actuators have resonance frequencies substantially in excess of the unstable frequencies of the stream. The actuators are energized by carrier signals at the resonance frequencies of the actuators, which carrier signals have been modulated at the desired unstable frequency of the stream.
    Type: Grant
    Filed: December 5, 1990
    Date of Patent: August 20, 1991
    Inventors: Ari Glezer, Kris J. Nygaard, John M. Wiltse