A process and apparatus for ultrasonic cleaning of materials in which vibrating plates are used in close contact with a material to be cleaned. The material is placed in a shallow liquid and the vibrator of the plates eliminate dirt or contaminating substances from the material by cavitation of the liquid....http://www.google.de/patents/US6266836?utm_source=gb-gplus-sharePatent US6266836 - Process and device for continuous ultrasonic washing of textile
