Patents by Inventor Ralph Davidson

Ralph Davidson 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).

  • Image observation apparatus
    Patent number: 4237492
    Abstract: An apparatus which permits direct observation of an image produced by one image generator, simultaneously permits remote observation of an image produced by a second image generator, and switchably permits the simultaneous observation of both images directly and remotely.
    Type: Grant
    Filed: March 2, 1979
    Date of Patent: December 2, 1980
    Assignee: Sperry Corporation
    Inventors: Irving Roth, Ralph Davidson