Ultrasonic field generating device
Patent 4941135 Issued on July 10, 1990. Estimated Expiration Date: 
May 8, 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.
May 8, 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 References Re32062 3397936 Method and apparatus for shaping and enhancing acoustical levitation forces Method and apparatus for sonic separation and analysis of components of a fluid mixture Ultrasonic testing instrument and method Selectable focus sphericone transducer and imaging apparatus Constant beamwidth frequency independent acoustic antenna Patent #: 4480324 InventorAssigneeApplicationNo. 348189 filed on 05/08/1989US Classes:367/150, With modifying lens209/155, Liquid210/748, Utilizing electrical or wave energy (directly applied to liquid or material being treated)367/140SIGNAL TRANSDUCERSExaminersPrimary: Jordan, Charles T.Assistant: Eldred, J. Woodrow Attorney, Agent or FirmForeign Patent References
International ClassesB03B 001/00H04R 017/00 Foreign Application Priority Data1986-05-27 GBAbstractA liquid column (2) is placed between two high-frequency ultrasound sources (6) in the field of a standing wave produced by the sources. Each source produces a convergent beam that compensates for a substantial part of the attenuation of the ultrasound energy that occurs at higher frequencies. It is thereby possible to increase considerably the axial distance along the standing wave over which streaming effects due to acoustic pressure are absent or negligible. It is also possible to increase the angle of convergence to compensate for divergence of the outputs from the sources.Other References
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