Patents by Inventor Theodorus Maria Berendina Schoenmakers

Theodorus Maria Berendina Schoenmakers 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).

  • Gas discharge electron gun for generating an electron beam by means of a glow discharge
    Patent number: 4004172
    Abstract: A gas discharge electron gun for generating an electron beam by secondary emission from an active surface of a cathode which is surrounded by a cathode sleeve coaxially projecting towards an open end of a tubular anode.
    Type: Grant
    Filed: May 8, 1975
    Date of Patent: October 18, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Theodorus Maria Berendina Schoenmakers
  • Restorable cold cathode in a gas discharge electron gun
    Patent number: 4052633
    Abstract: Restorable cold cathode in a gas discharge electron ion gun in which the eroded material in the active surface of the cathode is restored by supplying new material in the form of a wire which is moved through a hole in the cathode body by means of a screw spindle.
    Type: Grant
    Filed: May 8, 1975
    Date of Patent: October 4, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Theodorus Maria Berendina Schoenmakers
  • Gas discharge electron gun for generating an electron beam by means of a glow discharge
    Patent number: 4019091
    Abstract: A gas discharge electron gun for generating an electron beam by means of a glow discharge. A rapid control (.apprxeq.1 msec) is possible by admitting the gas to the gun through at least one aperture in the inner wall of a tubular positive electrode.
    Type: Grant
    Filed: April 9, 1976
    Date of Patent: April 19, 1977
    Assignee: U.S. Philips Corporation
    Inventor: Theodorus Maria Berendina Schoenmakers
  • Method of finishing a workpiece of a non-conducting material, particularly diamond, by means of spark erosion
    Patent number: 4013863
    Abstract: Spark erosion is applied to a non-conducting workpiece while employing a dielectric liquid comprising an emulsion of an aqueous solution of an electrolyte in an organic liquid and a surfactant.
    Type: Grant
    Filed: November 3, 1975
    Date of Patent: March 22, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis van Osenbruggen, Johannes VAN Ruler, Theodorus Maria Berendina Schoenmakers