Patents by Inventor Richard A. Tuck

Richard A. Tuck 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).

  • Thermionic electron emitters and methods of making them
    Patent number: 4417173
    Abstract: A thermionic cathode (FIG. 1) comprises a porous matrix of tungsten (4) impregnated with alkaline earth activator.A coating (5) 1 .mu.m thick is formed on the matrix (4). The coating is of .sigma. phase alloy of molybdenum and osmium.Alternative .sigma. phase alloys are disclosed, and various methods of making cathodes are disclosed.
    Type: Grant
    Filed: March 6, 1981
    Date of Patent: November 22, 1983
    Assignee: E M I-Varian Limited
    Inventors: Richard A. Tuck, Heather B. Skinner
  • Thermionic electron emitter
    Patent number: 4147954
    Abstract: A thermionic electron emitter comprises a tube of wall thickness less than 0.1 mm, a body of thermionic electron emissive material compressed and sintered in the tube, and a ring, coaxial with the tube, within the body to provide constraint against cracking of the body.
    Type: Grant
    Filed: July 7, 1977
    Date of Patent: April 3, 1979
    Assignee: E M I-Varian Limited
    Inventor: Richard A. Tuck
  • Electron emitter with focussing arrangement
    Patent number: 4145635
    Abstract: An electron emitter comprises field emitter zones formed by projections of field emissive material separated by regions which are not field emissive. An extractor electrode for applying an electric field to the projections and a focus electrode have openings aligned with the emitter zones and material particles aligned with the non-emissive regions. The electrodes form, when suitably energised electron focussing fields to focus electrons emitted from the zones.
    Type: Grant
    Filed: November 2, 1977
    Date of Patent: March 20, 1979
    Assignee: E M I Varian Limited
    Inventor: Richard A. Tuck