Patents by Inventor Thomas F. Thompson

Thomas F. Thompson 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: 4160209
    Abstract: A method and apparatus using a single-frequency oscillator as a source for resonating, selectively, an infinite number of different higher-frequency resonant circuits. The oscillator signal is clipped, and this clipped signal is processed in an infinitely adjustable amplifier to change the slopes of leading and trailing edges thereof. The amplifier also functions to cause these modified edges to extend over a predetermined signal-level range.
    Type: Grant
    Filed: July 1, 1977
    Date of Patent: July 3, 1979
    Inventor: Thomas F. Thompson
  • Patent number: 4068100
    Abstract: The transmission of amplitude modulated stereo is achieved by modulating the positive and negative half cycles of a radio frequency carrier separately with a different one of the channels carrying the audio intelligence of a stereo program, thereby transmitting both stereo channels on the same carrier. The modulation is done after final amplification of the carrier signal, directly in the antenna circuit, in order to eliminate mixing of the two channels, and is achieved by utilizing each half cycle of radio frequency antenna current to activate separate modulators each connected to a different one of the sources of audio frequency intelligence signals. Reception of this transmission is achieved by inserting a radio frequency diode in the resonant circuit of each of two receiving antennas in opposite directions, whereby each antenna circuit is responsive only to a different one of the two channels.
    Type: Grant
    Filed: December 13, 1976
    Date of Patent: January 10, 1978
    Assignee: Pacific Northwest Broadcasting Corporation
    Inventor: Thomas F. Thompson