Patents Assigned to Russell J. Horn
  • Liquid conductivity measuring device
    Patent number: 3992662
    Abstract: A portable device for measuring the conductivity of a liquid between two probes spaced relative to each other along the lateral axis of a container. The gains of a plurality of operational amplifiers are varied for range, by conductivity and by temperature variations to provide a signal representative of the conductivity of the liquid. An oscillator using two operational amplifiers is used to drive the measuring amplifier.
    Type: Grant
    Filed: August 16, 1974
    Date of Patent: November 16, 1976
    Assignees: Billy D. Etherton, Eugene P. Ziner, William E. Berry, Russell J. Horn
    Inventors: Glenn Koepnick, Richard T. Balzen, Billy D. Etherton