Electromechanical film and procedure for manufacturing same
Patent 4654546 Issued on March 31, 1987. Estimated Expiration Date: 
November 20, 2004. 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 20, 2004. 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 3632443 3671784 3736436 3832580 3894243 3921014 Method of polarizing high molecular weight films Piezoelectric-type electroacoustic transducer Electret sensing medium having plural sensing units Variable acoustic wave energy transfer-characteristic control device InventorApplicationNo. 06/673485 filed on 11/20/1984US Classes:307/400, ELECTRETS29/594, Acoustic transducer310/334, Acoustic wave type generator or receiver381/116, With electrostatic loudspeaker381/191Having electrostatic element (e.g., electret, vibrating plate)ExaminersPrimary: Shoop, William M. Jr.Assistant: Paul, Shik Luen Attorney, Agent or FirmInternational ClassesH04R 3/00 (20060101)H04R 23/00 (20060101) AbstractThe present invention concerns a dielectric film for converting electromagnetic or electrostatic energy into mechanical work, and a procedure for manufacturing the film. The film of the invention consists of a homogeneous film layer foamed to be of full-cell type and which has been oriented by stretching it in two directions and coated at least in part on one side or on both sides with an electrically conductive layer. The film is manufactured by extruding the plastic which has been made to be foamable, into tubular shape, performing intermediate cooling of the tube and reheating it, expanding the heated tube in two directions, metallizing the outer surfaces and cutting the tube open to become a film. | |
