Patents by Inventor Frederik Louis van den Berg

Frederik Louis van den Berg 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).

  • Patent number: 3979751
    Abstract: A transmission device of a radiographic navigation system for azimuth determination, in which an electronic rotating directional beam pattern and a static omnidirectional phase reference beam pattern are generated. For obtaining exact phase relationships between the signals required for generating the said beam patterns, phase control loops are included in the signal paths; in these loops the carrier wave frequencies are transposed to a lower frequency and the modulations are removed before phase comparison measurements are performed.
    Type: Grant
    Filed: May 2, 1975
    Date of Patent: September 7, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Frederik Louis van den Berg