Patents by Inventor John E. Effland

John E. Effland 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: 5235341
    Abstract: A method and system for unambiguous pre-detection real time measurement of lightning strokes.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: August 10, 1993
    Inventors: John E. Effland, John M. Gipson, David B. Shaffer, John C. Webber
  • Patent number: 5008679
    Abstract: The method of locating an unknown radio-frequency transmitter includes: (a) receipt of signals radiated from the transmitter by a plurality of receivers; (b) retransmission of the received signals to a plurality of antennas; (c) performing a time difference of arrival (TDOA) calculation which compensates for a relative delay value, which is a function of the distances from the transmitter to each of the receivers, the distances from each of the receivers to the antennas, and the speed of light; (d) performing a frequency difference of arrival (FDOA) calculation which compensates for a relative frequency value, which is a function of the relative velocity of each receiver with respect to the velocity of the Earth; (e) repeating these steps a plurality of times; and (f) determining the location of the unknown transmitter based on the plurality of TDOA and FDOA calculations.
    Type: Grant
    Filed: January 31, 1990
    Date of Patent: April 16, 1991
    Assignee: Interferometrics Incorporated
    Inventors: John E. Effland, John M. Gipson, David B. Shaffer, John C. Webber
  • Patent number: 4929959
    Abstract: A printed-circuit antenna enabling two signals to be received simultaneously. Two layers of radiating elements and corresponding power dividers are provided, one set of power dividers being disposed orthogonally with respect to the other, so as to enable reception of two signals with orthogonal senses of polarization. Either dual linear or dual circular polarization may be achieved through suitable selection of radiating elements. Alternatively, a quadrature hybrid may be coupled, either externally or as an integral part of the antenna, to enable dual circular polarization.
    Type: Grant
    Filed: March 8, 1988
    Date of Patent: May 29, 1990
    Assignee: Communications Satellite Corporation
    Inventors: Robert M. Sorbello, John E. Effland, Amir I. Zaghloul