Pressure sensitive switch
Patent 4158117 Issued on June 12, 1979. Estimated Expiration Date: 
November 8, 1997. 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 8, 1997. 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 3120583 3464531 3503031 3586889 Piezoelectric key board switch Polymeric piezoelectric key actuated device Patent #: 3940637 InventorsAssigneeApplicationNo. 05/849609 filed on 11/08/1977US Classes:200/181, ELECTROSTRICTIVE OR ELECTROSTATIC200/262, Material310/329, Including inertia type operator310/338, Force or pressure measuring type310/800, PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)341/34Pressure sensitive actuationExaminersPrimary: Price, WilliamAssistant: Pollard, Steven M. Attorney, Agent or FirmInternational ClassesG01L 1/16 (20060101)H03K 17/94 (20060101) Foreign Application Priority Data1976-12-02 GBAbstractA pressure sensitive switch including a poly (vinylidene fluoride) (PVF2) sheet arranged to be compressed and laterally outwardly distended under a load carrying on each major surface thereof contact means for receiving a signal generated by the sheet when compressed and distended two thick blocks of solid elastomeric material between which is sandwiched the sheet, and means for compressing and laterally outwardly distending both blocks by relative motion toward each other thereby in the absence of tension forces compressing and laterally outwardly distending the sheet sandwiched therebetween to generate the signal. | |
