1
Lewis Balamuth, Arthur Kuris, Manuel Karatjas: Ultrasonic motors and converters. Ultrasonic Systems, March 15, 1977: US04012647 (106 worldwide citation)

The invention discloses various embodiments of an ultrasonic motor and converter adapted to be used in home or industrial ultrasonic devices. The ultrasonic motor is generally of a piezoelectric material having a removable tip or of a design in which the complete motor is contained in a housing, whi ...


2
Arthur Kuris, Lewis Balamuth, Manuel Karatjas: Ultrasonic motor-converter systems. Xygiene, September 14, 1976: US03980906 (40 worldwide citation)

Ultrasonic systems for use in consumer, and other applications, having electromechanical motor systems providing bursts of ultrasonic mechanical vibration at an applicator repeated at a sonic frequency to produce both ultrasonic and sonic vibratory motion and effect during use of said applicator.