Patents by Inventor Willem J. Van Den Hoek

Willem J. Van Den Hoek 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).

  • Integrated HID reflector lamp with HID arc tube in a pressed glass reflector retained in a shell housing a ballast
    Patent number: 6111359
    Abstract: An integrated reflector lamp includes a sealed envelope enclosing a high pressure gas discharge device. A shell has a rim portion which receives the sealed envelope and an opposing basal portion carrying a screw base. A ballast for igniting and operating the discharge device is enclosed within the shell between the screw base and the sealed envelope. The sealed envelope includes a reflective surface which directs light emitted by the discharge device. The reflective surface also provides effective heat management for preventing overheating of the ballast by the heat generated by the discharge device. The integrated lamp has photometrics and luminous efficacy which exceeds that of corresponding halogen and halogen IR reflector lamps while having an overall planform which fits within that of the corresponding lamp.
    Type: Grant
    Filed: May 9, 1996
    Date of Patent: August 29, 2000
    Assignee: Philips Electronics North America Corporation
    Inventors: Dale Work, Mark Fellows, Gregory Nelson, Kent Collins, Robertus A. J. Keyser, Andrew Jackson, Oscar J. Deurloo, Aswin J. G. Linden, Peter A. Seinen, Willem J. Van Den Hoek, Hendrik A. Van Esveld, Josephus C. M. Hendricx
  • High-pressure discharge lamp with miniature discharge vessel and integrated circuitry
    Patent number: 5923127
    Abstract: A discharge vessel with a ceramic wall is filled with inert gas and metal and is ignited and operated by an electronic circuit including a half bridge converter with an LC circuit which, when the lamp is not ignited, enters an oscillation state near a resonance frequency which lies near the third harmonic of the switching frequency of the half bridge converter. The vessel encloses a cylindrical discharge space of diameter D and length L, wherein L.ltoreq.D.ltoreq.1.2 L.
    Type: Grant
    Filed: May 8, 1997
    Date of Patent: July 13, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Robertus A. J. Keijser, Oscar J. Deurloo, Aswin J. G. Linden, Arthur Kimmels, Willem J. Van Den Hoek
  • High-pressure discharge lamp
    Patent number: 5811933
    Abstract: The invention relates to a high-pressure discharge lamp provided with a discharge vessel which is enclosed with intervening space by an outer bulb with a lamp cap, which lamp also comprises an UV-enhancer having a wall and an internal electrode and arranged in the space between outer bulb and discharge vessel.According to the invention, the wall of the UV-enhancer is made from ceramic material.The invention offers the advantage that the lamp ignites reliably at a comparatively low ignition voltage of 3 kV already.
    Type: Grant
    Filed: February 7, 1997
    Date of Patent: September 22, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Hubertus C.M. Van Den Nieuwenhuizen, Martinus J.M. Kessels, Gerardus M.J.F. Luijks, Willem J. Van Den Hoek, Hendrik M. Bleeker
  • Metal halide lamp having specific volume pressure ratio
    Patent number: 5808398
    Abstract: A metal halide lamp provided with an outer bulb having a volume V.sub.bu in which a discharge vessel with a volume V.sub.ob and having a ceramic wall is arranged, which vessel contains mercury, at least one halide, and also a rare gas having a filling pressure P.sub.ob. The relation P.sub.ob *V.sub.ob /V.sub.bu .ltoreq.6 mbar is satisfied.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: September 15, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Jan A. J. Stoffels, Willem J. Van Den Hoek