An ultrasonic rotary horn intended to be excited at a frequency of from about 18 to about 60 kHz, which horn is a shaped, solid metal object having a rotational axis and a radial surface terminated by a first end and a second end. The horn is radially symmetrical. The thickness of the horn at the rotational...http://www.google.es/patents/US5110403?utm_source=gb-gplus-sharePatente US5110403 - High efficiency ultrasonic rotary horn
