Patents Represented by Attorney James D. Frew

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  • Omnidirectional low noise piezoelectric transducer
    Patent number: 3947802
    Abstract: A piezoelectric ceramic transducer assembly for broadband noise-measuring drophone. A longitudinally polarized lead zirconate-titanate cylinder provided with end caps is sealed by O-rings within a circumferentially polarized lead zirconate-titanate cylinder providing high sensitivity, smooth response, omnidirectionality, and stability with temperature and hydrostatic pressure variations.
    Type: Grant
    Filed: June 12, 1972
    Date of Patent: March 30, 1976
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Allan C. Tims, Theodore A. Henriquez