Patents by Inventor Hans-Michael Helle

Hans-Michael Helle 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).

  • Circuit for driving an alternating current high pressure gas discharge lamp for a motor vehicle
    Patent number: 6624581
    Abstract: A circuit for operating an alternating current high pressure gas discharge lamp for a motor vehicle is described. The circuit includes a ballast, a superimposed pulse starter, a symmetrical lamp filter and a high pressure gas discharge lamp which is surrounded at least partially by a reflector, the symmetrical lamp filter being arranged between the high pressure gas discharge lamp and the superimposed pulse starter, with a filter capacitor arranged in parallel with the high pressure gas discharge lamp and with one reactance coil arranged in each of the connecting lines between this parallel circuit and the starter circuit, and with two lamp power supply lines at the input of the starter circuit, a capacitor being arranged between the reflector and at least one of the lamp power supply lines.
    Type: Grant
    Filed: November 9, 2000
    Date of Patent: September 23, 2003
    Assignee: Hella KG Hueck & Co.
    Inventors: Wolfgang Daub, Hans-Michael Helle, Stefan Moeller