Patents by Inventor Donald A. Kawachi

Donald A. Kawachi 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).

  • Optical modulator with ringing suppression
    Patent number: 4221463
    Abstract: Ringing caused by acoustic resonances in an electro-optical crystal modulator and commencing at the trailing edge of a pulse may be suppressed by the combination of a second electro-optical crystal and a polarizer. The polarization of the ringing passing through the second crystal is rotated 90.degree. by applying an appropriate voltage to the second crystal at the trailing edge of the pulse. The polarizer, properly oriented, then blocks the ringing. The crystals may comprise such materials as Cadmium Telluride or Gallium Arsenide.
    Type: Grant
    Filed: May 11, 1979
    Date of Patent: September 9, 1980
    Assignee: Raytheon Company
    Inventors: Edward Barsack, Arthur A. Chabot, Clarke E. Harris, Donald A. Kawachi, William A. Richardson