The invention provides systems, methods and apparatus for processing delicate parts within a process tank such as an ultrasonic tank. Typically, one or more transducers connect to the tank and respond to drive signals from a generator to produce ultrasound within process liquid within the tank. Specific...http://www.google.com.tw/patents/US6016821?utm_source=gb-gplus-share專利 US6016821 - Systems and methods for ultrasonically processing delicate parts
