Patents Assigned to MarCum Technologies, Inc.
  • Method for distinguishing return echoes from noise
    Patent number: 6819629
    Abstract: The present invention separates noise from actual return echoes of ultrasonic sound waves generated by the transducer of a sonar type fish finder by comparing the timing of generated ultrasonic pulses and received signals and disregarding signals when such timing does not match.
    Type: Grant
    Filed: April 14, 2003
    Date of Patent: November 16, 2004
    Assignee: MarCum Technologies, Inc.
    Inventors: Duane E. Cummings, Raphael J. Marzean, Paul W. Thorne