Patents by Inventor Willibrordus G. C. Verbeek

Willibrordus G. C. Verbeek 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).

  • High-pressure discharge lamp
    Patent number: 5039912
    Abstract: The high-pressure discharge lamp has around the discharge vessel an inner sheath of quartz glass and an outer sheath of aluminosilicate glass. An interference filter reflecting UV radiation is present between the discharge vessel and the outer sheath. The light emitted by the lamp thus satisfies the conventional standards regarding radiation for lamps operated in open luminaires.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: August 13, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Johannes A. J. M. Van Vliet, Willibrordus G. C. Verbeek
  • High-pressure gas discharge lamp and luminaire provided with said lamp
    Patent number: 4929863
    Abstract: The high-pressure gas discharge lamp has an ovoidal discharge space with oppositely arranged rod electrodes having a electrode coils spaced from the tip ends of the electrode. The ratio between the electrode distance d and the largest diameter of the discharge space D lies between 0.75 and 1.25. The lamp has a comparatively high power of 1600-2000 W and a defined Br/I ratio of 1.5-4. When arranged transversely in a luminaire having a concave rotation-symmetrical reflector and a screen, the lamp produces an accurately defined light beam suitable for illumination of sports grounds.
    Type: Grant
    Filed: August 26, 1988
    Date of Patent: May 29, 1990
    Assignee: U.S. Philips Corporation
    Inventors: Willibrordus G. C. Verbeek, Hendrik Wijbenga, Marie-Madelene Vossen-Bergmans