Patents by Inventor Willem Jacobus Van Den Hoek

Willem Jacobus 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).

  • Patent number: 7119490
    Abstract: A starter for a discharge lamp is disclosed for operation from an AC supply voltage. The starter comprises a first terminal for connection to a first lamp electrode, a second terminal for connection to a second lamp electrode, a switching element coupled between the first and second lamp electrode during operation, a control circuit coupled to a control electrode of the switching element for generating a control signal for rendering the switching element conductive and thereby allowing an AC preheat current with period T to flow through the lamp electrodes and for subsequently rendering the switching element non-conductive to generate an ignition voltage pulse between the lamp electrodes. The starter advantageously inflicts only a relatively small amount of damage to the electrodes of the discharge lamp by means of ignition voltage pulses that are applied to the discharge lamp before its electrodes are sufficiently heated (i.e.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: October 10, 2006
    Assignee: Koninklijke Philips Electronics, N.V.
    Inventors: Willem Jacobus Van Den Hoek, Marco Haverlag