Patents by Inventor Gijsbert J. Ponsen

Gijsbert J. Ponsen 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).

  • Discharge lamp operating circuit
    Patent number: 4074172
    Abstract: The invention relates to a device for operating a low-pressure sodium vapor discharge lamp without a stabilizing ballast.The lamp is provided with a discharge tube having first and second main electrodes opposing a third main electrode. An automatically operating change-over switch occasionally switches the lamp current to either the first or second electrodes. A reservoir of liquid sodium near the first electrode affects sodium vapor pressure in the discharge tube by the switching action.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: February 14, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Gustaaf A. Wesselink, Hendrik Roelofs, Gijsbert J. Ponsen