Patents by Inventor Jacobus L. J. Ruigrok

Jacobus L. J. Ruigrok 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 discharge lamp with torsionally wound electrode structure
    Patent number: 5742125
    Abstract: The high pressure discharge lamp has refractory electrodes each having a top and a winding of refractory metal wire, which has turns and is, in an area thereof remote from the top, secured to the electrode. The turns of the winding are made to have torsion. Thereby an accurately defined position with respect to the top of the electrode is obtained. The direction of the torsion is opposite to the direction of the turns, which causes neighbouring turns to press one against the other.
    Type: Grant
    Filed: October 31, 1996
    Date of Patent: April 21, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Jacobus L. J. Ruigrok