Patents by Inventor John Evans, Jr., deceased

John Evans, Jr., deceased 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).

  • Plural gun cathode ray tube having parallel plates adjacent grid apertures
    Patent number: 4086513
    Abstract: In the tube gun, at least one of the two electrode grids nearest the screen has extensions on opposite sides of its apertures to distort an electrostatic field formed by the grid to at least partially compensate for distortion of an electron beam in the magnetic deflection field.
    Type: Grant
    Filed: March 3, 1975
    Date of Patent: April 25, 1978
    Assignee: RCA Corporation
    Inventor: John Evans, Jr., deceased
  • In-line electron guns having consecutive grids with aligned vertical, substantially elliptical apertures
    Patent number: 3952224
    Abstract: In the tube gun, the apertures of the two grids closest to the cathodes are vertically elongated or, preferably, vertically elliptically shaped to provide at least partial compensation for beam distortion occuring in a deflection zone of the tube.
    Type: Grant
    Filed: October 4, 1974
    Date of Patent: April 20, 1976
    Assignee: RCA Corporation
    Inventor: John Evans, Jr., deceased