Crosslinked polyphosphazenes as piezoelectric materials
Patent 4933479 Issued on June 12, 1990. Estimated Expiration Date: 
October 26, 2009. 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.
October 26, 2009. 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 ReferencesFilament with conductive layers Patent #: 4303733 InventorsAssigneeApplicationNo. 430095 filed on 10/26/1989US Classes:558/199, Nitrogen bonded directly to the phosphorus310/800, PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)528/399Phosphorus reactant contains a nitrogen atomExaminersPrimary: Sutto, Anton H.Attorney, Agent or FirmInternational ClassC07C 009/24Foreign Application Priority Data1987-07-27 JPAbstractPiezoelectric materials characterized by consisting essentially of crosslinked polyphosphazenes obtained by bringing polyphosphazenes which have repeating structural units represented by the general formula [I]--NP(X)a (Y)b -- [I](all the symbols are as defined in the appended claims) into oriented state in an electric field provided by applying high voltage on them and then crosslinking them under such conditions.Piezoelectric materials thus obtained display an excellent piezoelectric effect and, in addition, rubber elasticity. |
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