Patents by Inventor John C. Turnbull

John C. Turnbull 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).

  • Method for making an indirectly-heated cathode assembly
    Patent number: 4210988
    Abstract: In a method for making an indirectly-heated cathode assembly, the steps of spacing the heater from the cathode substrate with a temporary volatilizable spacer, fixing the positions of the heater and cathode with respect to one another with the spacer therebetween, and then volatilizing the spacer.
    Type: Grant
    Filed: August 24, 1978
    Date of Patent: July 8, 1980
    Assignee: RCA Corporation
    Inventors: John C. Turnbull, Benjamin F. Yoder
  • Method for coating cathode material on cathode substrate
    Patent number: 4170811
    Abstract: In a method for making a cathode for an electron tube, after the cathode substrate and at least one apertured grid have been assembled into a mount assembly, an elongated support carrying cathode material is passed through the grid aperture, and cathode material is transferred to the substrate.
    Type: Grant
    Filed: September 5, 1978
    Date of Patent: October 16, 1979
    Assignee: RCA Corporation
    Inventor: John C. Turnbull