Patents by Inventor Marc G. A. M. Van Delm

Marc G. A. M. Van Delm 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).

  • High-pressure sodium vapor discharge lamp
    Patent number: 4981330
    Abstract: A high-pressure sodium vapor discharge lamp having a discharge vessel in which main electrodes are arranged and an ignition system which comprises an electric conductor surrounding the discharge vessel over at least a part of its circumference, which conductor is electrically connected to a main electrode at least in the inoperative state of the lamp. The electric conductor is a clamping member clamping around the discharge vessel. A fixed, arcuate positioning of the electric conductor is thus obtained.
    Type: Grant
    Filed: May 18, 1989
    Date of Patent: January 1, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Marc G. A. M. Van Delm, Franciscus N. G. R. van der Kruijs
  • High-pressure discharge lamp
    Patent number: 4751432
    Abstract: The invention relates to a high-pressure discharge lamp comprising an outer bulb accommodating a first and a second discharge vessel, these discharge vessels being connected electrically in series. According to the invention, the second discharge vessel is electrically shunted by a bimetal switch which is closed at a temperature of at least 300 K. The lamp thus starts in two steps, which facilitates the starting process and renders it more reliable.
    Type: Grant
    Filed: March 20, 1986
    Date of Patent: June 14, 1988
    Assignee: U.S. Philips Corporation
    Inventor: Marc G. A. M. Van Delm