Patents by Inventor Blair E. Sim

Blair E. Sim 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).

  • Hydroacoustic sonar equipment
    Patent number: 4949318
    Abstract: The invention relates to a hydroacoustic sonar system in which received signals are processed without extensive filtering thereby to conserve higher fourier components of the received signals and so conserve useful information of targets. This is achieved by using a wideband detector module to effect demodulation of the received signals, and so eliminating the usual intermediate frequency stage. The module comprises a wideband input amplifier, a wideband full wave detector and an active low pass filter having a cut off frequency of at least 50 kHz.
    Type: Grant
    Filed: June 1, 1989
    Date of Patent: August 14, 1990
    Inventors: Paul H. Patrick, Gerald A. Hunt, Blair E. Sim