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Piezoelectric filter element

  • US 3,321,648 A
  • Filed: 06/04/1964
  • Issued: 05/23/1967
  • Est. Priority Date: 06/04/1964
  • Status: Expired due to Term
First Claim
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1. A PIEZOELECTRIC COUPLING ELEMENT HAVING A RESONANT FREQUENCY AND COMPRISING A FIRST DISCOID PIEZOELECTRIC TRANSDUCER HAVING OPPOSITE SURFACES AND CAPABLE OF VIBRATING AT FREQUENCIES INCLUDING SAID RESONANT FREQUENCY, A SECOND DISCOID PIEZOELECTRIC TRANSDUCER HAVING OPPOSITE SURFACES AND CAPABLE OF VIBRATION AT FREQUENCIES INCLUDING SAID RESONANT FREQUENCY, ELECTRODE MEANS AFFIXED TO SAID SURFACES, A THIN DISCOID RELATIVELY STIFF RUBBER-LIKE CUSHIONING MEMBER POSITIONED BETWEEN SAID TRANSDUCERS WITH ITS OPPOSITE FACES FACING SAID ELECTRODE MEANS, MEANS FOR BONDING EACH FACE OF SAID CUSHIONING MEMBER TO THE ADJACENT ONE OF SAID ELECTRODE MEANS SO AS TO MECHANICALLY COUPLE TOGETHER THE FIRST AND SECOND TRANSDUCERS,

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