Active suspension piezoelectric polymer transducer
Patent 4401911 Issued on August 30, 1983. Estimated Expiration Date: 
March 2, 2001. 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.
March 2, 2001. 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 3816774 Piezoelectric-type electroacoustic transducer Polymeric piezoelectric transducer with thermoformed protuberances Patent #: 4284921 InventorsAssigneeApplicationNo. 06/239642 filed on 03/02/1981US Classes:310/334, Acoustic wave type generator or receiver381/190Electrostrictive, magnetostrictive, or piezoelectricExaminersPrimary: Budd, Mark O.Attorney, Agent or FirmInternational ClassH04R 17/00 (20060101)Foreign Application Priority Data1980-03-04 FRAbstractAn electromechanical transducer comprising a radiating structure whose active element is formed by a polymer film placed between two electrodes.The invention provides a transducer in which a closure element having the exact shape of a spherical surface portion is connected to at least one active peripheral suspension which simulates the movements of a pulsating sphere portion completing the closure element. | |
