Patents by Inventor Robert Frossard

Robert Frossard 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).

  • Cathode with fast heat switch-on and switch-off mechanism and grid-type electron tube including such a cathode
    Patent number: 5666018
    Abstract: An electron tube cathode has a hollow cylindrical structure formed by thermo-emissive wires mounted between two conductive supports. The two supports are mechanically fixed to each other. To prevent the deformation of the cathode when the heating is turned on and turned off, at least one spring is used, this spring being integrated with one of the supports and being placed in the vicinity of the thermo-emissive wires. The spring is made of a material possessing elastic properties which, at ambient temperature, are lower than or equal to the properties that it has at a temperature greater than ambient temperature.
    Type: Grant
    Filed: June 14, 1996
    Date of Patent: September 9, 1997
    Assignee: Thomson Tubes Electroniques
    Inventors: Michel Langlois, Robert Frossard