Patents by Inventor Pierre Palluel

Pierre Palluel 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).

  • Thermoelectric cathode for a hyperfrequency valve and valves incorporating such cathodes
    Patent number: 4494035
    Abstract: This invention concerns a thermoelectronic cathode for hyperfrequency electron tubes.The cathode comprises a cylindrical molybdenum casing, the lower portion of which contains a heating filament, while the upper portion contains two superimposed porous bodies, the lower one made from impregnated material, and the upper one from non-impregnated material.
    Type: Grant
    Filed: November 4, 1981
    Date of Patent: January 15, 1985
    Assignee: Thomson-CSF
    Inventors: Pierre Palluel, Arvind Shroff
  • Hot cathode, its production process and electron tube incorporating such a cathode
    Patent number: 4393328
    Abstract: The hot cathode, according to the invention, is constituted by a fritted matrix 1 and a heating filament 4, said matrix being formed from a powder mixture 2 of tungsten and another high work function refractory metal and covered with a high work function refractory metal film 3. FIG. 3.
    Type: Grant
    Filed: November 5, 1980
    Date of Patent: July 12, 1983
    Assignee: Thomson-CSF
    Inventors: Arvind Shroff, Pierre Palluel
  • Microwave electronic tube with an improved collector
    Patent number: 3940655
    Abstract: In order to reduce the drawbacks, encountered in microwave electronic tubes, resulting from the presence of electrons reflected from the collector of these tubes towards the tube input, the invention provides for the collectors of these tubes to take the form of hollow bodies whose at least part of the internal volume exhibits an axis of symmetry not coinciding with the axis of the beam. This arrangement reduces the number of electrons liable to return towards the tube input and produces a spread in their phases. Application is made to klystrons.
    Type: Grant
    Filed: June 13, 1974
    Date of Patent: February 24, 1976
    Assignee: Thomson-CSF
    Inventors: Pierre Palluel, Jean Hervier, Jean Rousseau