Polyurethane elastomer actuator
Patent 5977685 Issued on November 2, 1999. Estimated Expiration Date: 
June 3, 2016. 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.
June 3, 2016. 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 3772537 Transducer for generation and detection of shear waves Spiral piezoelectric rotary actuator Piezoelectric polymer laminates for torsional and bending modal control Piezoelectric electronic switch Piezoelectric device Self biasing charging member Patent #: 5610795 InventorsAssigneeApplicationNo. 660061 filed on 06/03/1996US Classes:310/311, Piezoelectric elements and devices310/330, Bending type310/332, Multimorph310/800PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)ExaminersPrimary: Jones, DeborahAssistant: Lam, Cathy F. Attorney, Agent or FirmInternational ClassH04R 017/00Foreign Application Priority Data1996-02-15 JPAbstractA polyurethane elastomer actuator comprising a polyurethane elastomer 1 capable of deforming due to the orientation by an electric field, wherein the shrinkage displacement occurring at the time of the application of an electric field is transformed into other displacement. This polyurethane elastomer actuator does not require electrolyte and high voltage. Since it is not accompanied by chemical reactions and heat generation, its durability hardly deteriorates. This actuator deforms largely during driving.Other References
Field of SearchCOMPOSITE (NONSTRUCTURAL LAMINATE)Of polyamidoester (polyurethane, polyisocyanate, polycarbamate, etc.) Next to second layer of polyamidoester Particulate metal or metal compound-containing MATERIAL DESIGNED TO BE RESPONSIVE TO TEMPERATURE, LIGHT, MOISTURE, ETC. ELECTROSTRICTIVE OR ELECTROSTATIC Voltage, spark or current generator PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF) Bending type Multimorph Piezoelectric elements and devices | |
