Patents by Inventor Alfred P. De Fonzo

Alfred P. De Fonzo 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 phase shifter
    Patent number: 4263570
    Abstract: A reciprocal phase shifter for optically controlling the phase of microwa millimeter, and submillimeter wavelength electromagnetic energy includes a source of light and a waveguide which comprises an interaction material for absorbing the light and forming a plasma of electron-hole pairs within the material. The plasma interacts with a traveling wave in the waveguide. The speed at which the wave propagates changes in the interaction region and thereby changes the phase of the wave.
    Type: Grant
    Filed: October 24, 1978
    Date of Patent: April 21, 1981
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Alfred P. De Fonzo, Thomas G. Giallorenzi