Piezoelectric and pyroelectric film
Patent 4557880 Issued on December 10, 1985. Estimated Expiration Date: 
March 14, 2003. 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 14, 2003. 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 3903733 Production of alcohols from carboxylic acids Transducer having piezoelectric film arranged with alternating curvatures Piezoelectric elements of organic high molecular weight materials Production of piezoelectric PVDF films Piezo-electric film manufacture Process for producing piezoelectric polymer films Patent #: 4427609 InventorAssigneeApplicationNo. 06/475377 filed on 03/14/1983US Classes:264/435, Molecular aligning or molecular orientating (e.g., poling, etc.)156/244.17, Electrical, magnetic, or wave energy used156/380.9, With radiant heater not touching work156/496, To transversely stretch or tension the web264/104, FORMING ELECTRICAL ARTICLES BY SHAPING ELECTROCONDUCTIVE MATERIAL427/100Piezoelectric propertiesExaminersPrimary: Thomas, Alexander S.Attorney, Agent or FirmInternational ClassesH01L 37/02 (20060101)H01L 37/00 (20060101) H01L 41/22 (20060101) H01L 41/26 (20060101) Foreign Application Priority Data1982-03-18 GBAbstractFilm with piezoelectric and pyroelectric properties is obtained by extruding PVDF, stretching the extrudate and applying a corona discharge, preferably at the place where stretching occurs. The PVDF may be homopolymer, but copolymers of at least 50 mole % of vinylidene fluoride with tetrafluoroethylene and/or trifluoroethylene may be used.Other References
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