Patents by Inventor Johannes A. M. Louwers

Johannes A. M. Louwers 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).

  • Switching device having varying RC time period for ignition of a lamp
    Patent number: 5929573
    Abstract: The invention relates to a switching device for operating a lamp by means of a high-frequency current, which switching device comprises a DC-AC converter whose oscillation frequency is determined by a timer circuit comprising a resistor and a capacitor. In accordance with the invention, the timer circuit also comprises a chain C which includes a switching element and which is used to increase the RC period of the timer circuit during ignition of the lamp, thereby increasing the amplitude of the voltage across the lamp.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: July 27, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Johannes A. M. Louwers, Nicolaas H. M. Pol