Acoustic driving of rotor
Patent 4139806 Issued on February 13, 1979. Estimated Expiration Date: 
July 5, 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.
July 5, 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 3343010 3379889 3882732 InventorsAssigneeApplicationNo. 05/812447 filed on 07/05/1977US Classes:318/116, NONMAGNETIC MOTOR310/20, Motion-converting mechanism310/26, Magnetostrictive310/322, Acoustic wave type generator or receiver310/334, Acoustic wave type generator or receiver60/721, MISCELLANEOUS73/570.5Acoustic levitationExaminersPrimary: Gill, James J.Attorney, Agent or FirmInternational ClassesG10K 15/00 (20060101)H02N 11/00 (20060101) AbstractSound waves are utilized to apply torque to a body in an enclosure of square cross section, by driving two transducers located on perpendicular walls of an enclosure, at the same frequency but at a predetermined phase difference such as 90°. The torque is a first order effect, so that large and controlled rotational speeds can be obtained. | |
