Patents by Inventor Lodewijk H. M. Meessen

Lodewijk H. M. Meessen 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).

  • Operating circuit for a high-pressure discharge lamp
    Patent number: 5039916
    Abstract: A circuit arrangement suitable for operating a high-pressure discharge lamp (80) in conjunction with a controlled current limiter (6) by means of a control signal which is at least composed of the sum of a lamp-voltage-dependent signal part and a lamp-current-dependent signal part. The invention, the absolute value of the lamp-current-dependent signal part is chosen to be smaller than the absolute value of the lamp-voltage-dependent signal part. The circuit arrangement provides a rapid control, which keeps the lamp voltage substantially constant.
    Type: Grant
    Filed: June 17, 1986
    Date of Patent: August 13, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Lodewijk H. M. Meessen, Ralf Schafer, Steven Kemmink, Hilbert Palmers
  • High-pressure sodium vapor discharge lamp
    Patent number: 4795943
    Abstract: A high-pressure sodium vapor discharge lamp having a ceramic discharge vessel, which has over a length L a substantially constant inner diameter and in which electrodes are arranged opposite to each other at a relative distance D. The lamp emits white light during operation and consumes a power of at most 50 watts. The lamp has a high efficiency and good color rendering due to the fact that D/L.ltoreq.0.5.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: January 3, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Petrus H. Antonis, Lodewijk H. M. Meessen, Ralf Schafer