Patents by Inventor John D. Patterson

John D. Patterson 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).

  • Frequency multiplexed seismic cable
    Patent number: 4187493
    Abstract: A cable for electrically connecting a plurality of seismic receivers to a central data collecting unit contains a single electrical channel. The output signal of each seismic receiver is used to modulate a carrier signal having its own distinct frequency. The plurality of modulated carrier signals are frequency division multiplexed onto the single electrical channel and transmitted to the central collecting unit. There, narrowband filters are used to demultiplex the individual modulated carriers so that the signals may then be demodulated to recover the individual seismic receiver signals.
    Type: Grant
    Filed: June 12, 1978
    Date of Patent: February 5, 1980
    Assignee: Texas Instruments Incorporated
    Inventor: John D. Patterson