Patents by Inventor Hubert Raets

Hubert Raets 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).

  • Electric circuit with transient voltage doubling for improved operation of a discharge lamp
    Patent number: 4766350
    Abstract: The invention relates to an electric arrangement for operating a an electric discharge lamp (13) which is connected in series with a coil (14) and a switch (15) to a pulsatory direct voltage source. The combination of the lamp and the coil is shunted by a rectifier. The lamp is shunted by a capacitor (18) and the switch is periodically rendered conductive at an instant when the instantaneous voltage of the pulsatory direct voltage source is between 0.5 and 0.8 times the then required re-ignition voltage of the lamp. The voltage build up across the capacitor (18) after the switch has become conducting causes the lamp to reignite. The luminous efficacy of the lamp is comparatively high.
    Type: Grant
    Filed: September 10, 1982
    Date of Patent: August 23, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Theo Husgen, Hubert Raets, Gerd Schiefer, Jan Zwier