Patents by Inventor Theodorus L. Van Rooy

Theodorus L. Van Rooy 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).

  • Optical multiplexer and demultiplexer
    Patent number: 4741588
    Abstract: In optical multiplexers and demultiplexers which utilize interference filters and optical gratings losses and noise are reduced by converting the unpolarized light into linearly polarized light. This improves the efficiency of the filters and gratings and suppresses noise which is caused by fluctuations in the degree of polarization of unpolarized light because filters and gratings have different characteristics for the different polarization directions.
    Type: Grant
    Filed: August 26, 1982
    Date of Patent: May 3, 1988
    Assignee: U.S. Philips Corporation
    Inventors: Antonius J. A. Nicia, Theodorus L. Van Rooy, Jan Haisma