Patents by Inventor Johannes A. T. Verhoeven

Johannes A. T. Verhoeven 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).

  • Oxide cathode
    Patent number: 4471260
    Abstract: An oxide cathode comprising a metal base substantially consisting of titanium and a heating element for heating said base, on which base a porous layer comprising an alkaline earth metal oxide is provided. The cathode has a comparatively low operating temperature, a short warm up time and a low power requirement.
    Type: Grant
    Filed: January 18, 1982
    Date of Patent: September 11, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Jan Hasker, Jacobus H. Jacobs, Peter Opmeer, Johannes A. T. Verhoeven
  • Gas discharge laser
    Patent number: 4213100
    Abstract: A gas discharge laser in which at least the inner wall of the laser tube is manufactured for the greater part from a gehlenite glass thereby providing a laser having a long life. The gehlenite glass can better withstand the eroding effect of the gas discharge so that the rate at which the optical elements are contaminated is greatly reduced.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: July 15, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Robertus A. J. Keijser, Gustaaf A. Wesselink, Bram J. Derksema, Johannes A. T. Verhoeven