Artech has filed for patent and patented different ideas for ultrasonic sieving and cutting:

Patent numberDescriptionStatus July 2012
EP 2 049 274 B1Find the optimum working point in the frequency spectrum and sweep of the frequency around this point.Patented in Europe.
10 2006 047 592Tuned ultrasonic waveguide led through a hole in the sieving frame with fixing and sealing to the frame.Patented in Germany.
EP 2 217 388 B1Ultrasonic excitation of a cylindrical sieving basket according to the Artech-Frequency-Sweep method.Patented also outside Europe.
20 2011 102752.3Integration of the screen waveguide into the frame with a thin bridge in between.Utility model
10 2011 118 208.3Ultrasonic excitation of a cutting knife according to the Artech Frequency Sweep Method.Filed for patent.