Patents by Inventor John F. Dreyer

John F. Dreyer 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).

  • Apparatus and method for converting mechanical wave energy to optical energy
    Patent number: 3991606
    Abstract: A piezo-optic cell having a nematic liquid crystal film and first and second wedge-shaped plates on opposite surfaces of the film which serve to vary its frequency response along the length of the cell. The cell is illuminated with polarized light and is insonified by an acoustic wave pattern to produce a real-time visual image of the acoustic wave. By exposing the cell to the applied acoustic energy, one or more resonance conditions are created to produce an extremely strong and well defined image.
    Type: Grant
    Filed: November 8, 1974
    Date of Patent: November 16, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: John F. Dreyer