Sensor for acoustic shockwave pulses
Patent 4803671 Issued on February 7, 1989. Estimated Expiration Date: 
July 29, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 29, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2545101 Low frequency hydrophone Acoustically transparent hydrophone probe Bubble trap for ultrasound scanhead Transducer hydrophone with filled reservoir Ultrasonic sensor Patent #: 4734611 InventorsAssigneeApplicationNo. 07/079177 filed on 07/29/1987US Classes:367/166, Liquid filled310/337, Underwater type310/800, PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)367/167, Pressure compensating means73/632Sonic wave transmitter or receiver transducerExaminersPrimary: Tokar, MichaelAssistant: Fess, Lawrence G. Attorney, Agent or FirmInternational ClassesG01H 11/08 (20060101)G01H 3/00 (20060101) G01H 11/00 (20060101) Foreign Application Priority Data1986-07-30 DEAbstractA sensor for acoustic shockwave pulses, such as in lithotripsy, includes a piezo-electric measuring membrane disposed between two coupling membranes. The intervening space between the coupling membranes is filled with a coupling medium for transmitting the acoustic shockwave pulses. The measuring membrane is in a defined condition largely independent of external influences so that flows in the coupling medium or different pressure exertions on the two coupling membranes do not influence the measured signal produced by the measuring membrane.Other References
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