Electrostrictive acoustic projector and polymers used therein
Patent 5835453 Issued on November 10, 1998. Estimated Expiration Date: 
May 5, 2017. 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.
May 5, 2017. 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 3801839 Multiple layer piezoelectric wavefront modulator Crosslinked polyphosphazenes as piezoelectric materials Patent #: 4933479 InventorsApplicationNo. 851544 filed on 05/05/1997US Classes:367/140, SIGNAL TRANSDUCERS29/25.35, PIEZOELECTRIC DEVICE MAKING310/311, Piezoelectric elements and devices367/157, Piezoelectric367/163With diaphragmExaminersPrimary: Eldred, J. WoodrowAttorney, Agent or FirmForeign Patent References
International ClassH04R 017/00AbstractPolymer materials having a low Young's modulus, a low dielectric constant, and a high apparent piezoelectric response when subjected to a high direct bias voltage and a superimposed alternating voltage, used as the active element in an underwater acoustic signal projector of a sonar system.Other References
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