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Self powered compressional wave transmitter

  • US 3,077,574 A
  • Filed: 04/20/1959
  • Issued: 02/12/1963
  • Est. Priority Date: 04/20/1959
  • Status: Expired due to Term
First Claim
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1. A SELF-POWERED TRANSMITTER FOR GENERATING PERIODIC BURSTS OF ULTRASONIC FREQUENCY COMPRESSIONAL WAVES COMPRISING, A PIEZOELECTRIC TRANSDUCER, AN INDUCTOR COUPLED TO SAID TRANSDUCER, SAID TRANSDUCER AND SAID INDUCTOR FORMING AN LC CIRCUIT RESONANT AT SAID ULTRASONIC FREQUENCY, A TRANSISTORIZED OSCILLATOR HAVING A LOAD CIRCUIT INCLUDING SAID LC CIRCUIT, A MAGNETO HAVING A VOLTAGE COIL LINED BY A MAGNETIC CIRCUIT AND ARRANGED TO SUPPLY OPERATING POTENTIALS TO SAID TRANSISTORIZED OSCILLATOR, SAID MAGNETIC CIRCUIT INCLUDING A PERMANENT MAGNET AND A VIBRATABLE REED, SAID REED UPON VIBRATION CHANGING THE RELUCTANCE OF SAID MAGNETIC CIRCUIT AND CAUSING AN ALTERNATING CURRENT VOLTAGE OF A FREQUENCY EQUAL TO THE FREQUENCY OF VIBRATION OF SAID REED TO BE INDUCED IN SAID

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