Piezoelectric and pyroelectric polymer film and process for preparing same
Patent 4308370 Issued on December 29, 1981. Estimated Expiration Date: 
April 21, 2000. 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.
April 21, 2000. 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 2935418 3691264 Process for producing polymeric piezoelectric elements and the article formed thereby Process for controlled phase transformation of alpha phase of poly(vinylidene fluoride) to the gamma phase Patent #: 4095020 InventorsAssigneeApplicationNo. 06/142265 filed on 04/21/1980US Classes:526/255, Two or more fluorine atoms, e.g., vinylidene fluoride, etc.264/435, Molecular aligning or molecular orientating (e.g., poling, etc.)264/483, Plasma (e.g., corona, glow discharge, etc.)29/25.35PIEZOELECTRIC DEVICE MAKINGExaminersPrimary: Lowe, JamesAttorney, Agent or FirmInternational ClassesH01G 7/00 (20060101)H01L 41/22 (20060101) H01L 41/26 (20060101) H01G 7/02 (20060101) Foreign Application Priority Data1979-04-26 JPAbstractA process for preparing polyvinylidene fluoride type (PVDF) films having highly stable piezoelectricity and pyroelectricity, by stretching PVDF films, while causing corona discharge, across the electric field formed by discharging, to effect thereby to polarization of film. | |
