Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Carl Siversson4
Date of Patent
March 9, 2010
Patent Application Number
11663574
Date Filed
September 23, 2005
Patent Citations Received
Patent Primary Examiner
Patent abstract
The invention relates to a method and a device for separating particles using ultrasonic standing waves which are switched between two different frequencies. A second order harmonic standing wave is used together with the fundamental standing wave. If the particles are exposed to the fundamental standing wave, the forces act to collect particles at the center. If the particles are exposed to the second order harmonic standing wave, the forces act to collect particles at the two pressure nodes at the sides. By switching the frequency between the second order harmonic standing wave and the fundamental standing wave, particles with different properties will be exposed to different accelerations and are separated into two streams.
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