Die drawing process and apparatus for piezoelectric polymer films and tubes
Patent 4800048 Issued on January 24, 1989. Estimated Expiration Date: 
November 30, 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.
November 30, 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 3275730 3290420 3417176 Process for producing piezoelectric polymer films Process and apparatus for the preparation of electret filaments, textile fibers and similar articles Piezoelectric and pyroelectric film Patent #: 4557880 InventorsAssigneeApplicationNo. 07/126993 filed on 11/30/1987US Classes:264/435, Molecular aligning or molecular orientating (e.g., poling, etc.)264/104, FORMING ELECTRICAL ARTICLES BY SHAPING ELECTROCONDUCTIVE MATERIAL264/171.12, Hollow preform264/171.14, Of metal264/209.5, Stretching extruded material264/288.4, Stretching by applying tension264/346, To anneal or temper425/113, Extrusion shaping means425/174.6, Electrical energy conducted through work425/174.8EElectro-staticExaminersPrimary: Thurlow, JefferyInternational ClassesH01L 41/22 (20060101)H01L 41/26 (20060101) AbstractApparatus and processes for preparing polymeric piezoelectric films of one or more layers or tubular products having a central wire core by drawing a suitable polymeric blank through either a flat or a conically tapered drawing die having associated electrical field producing means, to simultanelusly stretch and pole the polymeric material within the die chamber. | |
