Patents by Inventor David S. Takach

David S. Takach 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: 4914418
    Abstract: Outbound signals carried over an electric power network are detected and crosstalk is rejected by sampling the waveform in three segments of each cycle. In the first segment valid signals are always absent. Valid signals appear at the same time in both the second and third segments. Sample waveform values from alternate half cycles are compared to detect differences indicative of outbound signal information. The energy in each of the three segments is compared with an energy threshold for that segment and a cycle under test is rejected when the energy in the first segment exceeds the threshold for that first segment. A cycle under test is also rejected if the energy in the third segment greatly exceeds the energy in the second segment. Signal detection thresholds for both signal strength and energy in the segments are set recursively using actual samples acquired at the outbound detection site. These thresholds are sensitive to dynamic network changes.
    Type: Grant
    Filed: January 3, 1989
    Date of Patent: April 3, 1990
    Assignee: Emerson Electric Co.
    Inventors: Sioe T. Mak, David S. Takach, Ray C. Hatton, Jr.
  • Patent number: 4638177
    Abstract: A rotating flux transformer which includes a magnetic core having poloidal primary and secondary windings and toroidal primary and secondary windings. Quadrature flux is produced in the magnetic core by connecting one end of the poloidal primary winding to the center of the toroidal primary winding. The quadrature flux combines vectorially to produce a rotating induction vector in the magnetic core.
    Type: Grant
    Filed: November 14, 1985
    Date of Patent: January 20, 1987
    Assignee: Westinghouse Electric Corp.
    Inventors: David S. Takach, Rao L. Boggavarapu, Ram R. P. Sinha