Patents by Inventor Gerardus M. J. F. Luijks

Gerardus M. J. F. Luijks 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: 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
  • High-pressure discharge lamp with an integral fuse-capacitor component
    Patent number: 5389856
    Abstract: The invention relates to a high-pressure discharge lamp (2) provided with a discharge vessel (3) and an outer envelope (30) which encloses a space (6). The lamp is provided with an igniter circuit (10) which comprises a voltage-dependent capacitor (8) and a fuse (7). According to the invention, the voltage-dependent capacitor and the fuse (7) are integrated so as to form a single component (18).
    Type: Grant
    Filed: January 8, 1993
    Date of Patent: February 14, 1995
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus M. J. F. Luijks, Hubertus A. M. Coenen
  • High-pressure discharge lamp
    Patent number: 5336974
    Abstract: The invention relates to a high-pressure discharge lamp including a discharge vessel and an outer envelope which encloses a space. The lamp has an igniter circuit which has a voltage-dependent capacitor and a resistor which are integrated so as to form a single component.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: August 9, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus M. J. F. Luijks, Hubertus A. M. Coenen
  • High-pressure discharge lamp having solid state getter mounted on bimetallic element
    Patent number: 5325017
    Abstract: The invention relates to a high-pressure discharge lamp (2) provided with a discharge vessel (3) with a ceramic wall (3a) and provided with a bimetal element (11) which rests against the discharge vessel wall in the cold state of the lamp, and which is removed from the discharge vessel wall during lamp operation. The discharge vessel is surrounded by an outer bulb (30) with intervening space (6), in which space a solid-state getter (15) is provided. According to the invention, the solid-state getter is provided on the bimetal element.
    Type: Grant
    Filed: September 23, 1992
    Date of Patent: June 28, 1994
    Assignee: U.S. Philips Corporation
    Inventors: Johannes A. T. Schellen, Gerardus M. J. F. Luijks
  • High-pressure discharge lamp
    Patent number: 5185557
    Abstract: A high-pressure discharge lamp has an outer bulb which surrounds a discharge vessel with intervening space. The lamp is provided with an ignition circuit which comprises a SIDAC. According to the invention, the SIDAC is mounted in a gas-filled, hermetically closed glass capsule in the outer bulb.
    Type: Grant
    Filed: January 22, 1992
    Date of Patent: February 9, 1993
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus M. J. F. Luijks, Hubertus A. M. Coenen
  • High-pressure discharge lamp
    Patent number: 5053676
    Abstract: The invention relates to a high-pressure discharge lamp provided with a discharge vessel enclosed with intervening space by an outer bulb. An ignition circuit includes a voltage-dependent capacitor. According to the invention, the capacitor is mounted in a gas-filled glass capsule in the outer bulb.
    Type: Grant
    Filed: October 11, 1990
    Date of Patent: October 1, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus M. J. F. Luijks, Hendrik M. Bleeker
  • High-pressure discharge lamp having electrodes wound in opposite sense
    Patent number: 4772822
    Abstract: The high-pressure discharge lamp has oppositely arranged electrodes of wound tungsten wire. The electrodes are the mirror images of one another and are arranged in the mirror image orientations of one another. The electrodes are free from material favoring electron emission. The form and the mutual relation of the electrodes prevent the lamp from flickering during operation in a position in which a straight line through these electrodes is horizontal.
    Type: Grant
    Filed: February 10, 1987
    Date of Patent: September 20, 1988
    Assignee: U.S. Philips Corp.
    Inventors: Hubertus C. M. van den Nieuwenhuizen, Gerardus M. J. F. Luijks
  • High-pressure sodium discharge lamp having reduced lamp voltage increase
    Patent number: 4755710
    Abstract: The invention relates to a high-pressure sodium discharge lamp intended to be operated in conjunction with an external starter or with an internal starter without a glow discharge. The lamp has an outer bulb which is provided with a lamp cap and encloses an evacuated space in which a discharge vessel is arranged. According to the invention, the space enclosed by the outer bulb further accommodates a closed holder, whose wall mainly comprises glass-forming constituents and which contains at least helium. Thus, it is achieved that the lamp has a strongly reduced increase in lamp voltage during the life.
    Type: Grant
    Filed: June 3, 1986
    Date of Patent: July 5, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Jacobus M. M. Claassens, Gerardus M. J. F. Luijks