| Patents for H02N 2 - Electric machines in general using piezo-electric effect, electrostriction or magnetostriction (14,251) |
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| 12/20/1991 | CA2019394A1 Method and device in a motor |
| 12/18/1991 | CN1057134A 电气牵引电动机 Electric traction motor |
| 12/17/1991 | US5073740 Laminate-type displacement element |
| 12/11/1991 | EP0460660A2 A device for driving a piezoelectric element |
| 12/11/1991 | EP0460387A2 Electric traction motor |
| 12/05/1991 | CA2040882A1 Electric traction motor |
| 11/27/1991 | EP0458638A1 Vibration wave driven motor |
| 11/26/1991 | US5068566 Electric traction motor |
| 11/26/1991 | US5068565 Motor conversion mechanism utilizing elastic action |
| 11/19/1991 | US5066884 Ultrasonic motor having high drive efficiency |
| 11/19/1991 | US5065999 Sheet feeding device utilizing vibration waves |
| 11/19/1991 | CA1292267C Ultrasonic driving device |
| 11/12/1991 | US5065067 Piezoelectric circuit |
| 11/09/1991 | WO1991017351A1 An apparatus for driving a piezoelectric actuator |
| 11/09/1991 | CA2063382A1 Apparatus for driving a piezoelectric actuator |
| 11/06/1991 | EP0455342A1 Piezoelectric/electrostrictive actuator having at least one piezoelectric/electrostrictive film |
| 10/30/1991 | EP0453826A1 Robotic articulation |
| 10/30/1991 | EP0453464A1 Control valve for a faucet and use of ultrasonic motor. |
| 10/29/1991 | US5061882 Power supply frequency regulating device for vibration wave driven motor |
| 10/28/1991 | CA2039546A1 Robotic articulation |
| 10/24/1991 | CA2039547A1 Piezoelectric rotary union system |
| 10/23/1991 | EP0452731A1 Piezoelectric rotary union system |
| 10/15/1991 | US5056201 Method of making a travelling-wave motor |
| 10/09/1991 | EP0450962A2 Vibration wave driven motor |
| 10/09/1991 | EP0450919A1 Vibration wave driven motor |
| 10/09/1991 | CN1055264A 压电马达 Piezoelectric motor |
| 10/08/1991 | US5055760 Linear actuator drive control apparatus |
| 10/08/1991 | US5055750 Air damper operating system of vehicle air conditioners |
| 10/08/1991 | US5055732 Ultrasonic motor |
| 10/02/1991 | EP0449048A1 Piezoelectric motor |
| 10/01/1991 | US5053798 Automatic focusing device |
| 10/01/1991 | US5053672 Energy converter apparatus |
| 10/01/1991 | US5053670 Precision actuator |
| 10/01/1991 | US5053669 Ultrasonic motor |
| 10/01/1991 | CA1290000C Ultrasonic driving device |
| 10/01/1991 | CA1289999C Ultrasonic driving device |
| 09/25/1991 | CN1054863A Direct current traveling wave motor |
| 09/24/1991 | US5051647 Ultrasonic motor |
| 09/24/1991 | CA2038465A1 Piezoelectric motor |
| 09/18/1991 | EP0447172A1 Ultrasonic motor |
| 09/18/1991 | EP0446591A2 Direct current traveling wave motor |
| 09/17/1991 | US5049775 Integrated micromechanical piezoelectric motor |
| 09/17/1991 | US5049774 Vibratory motor |
| 09/14/1991 | CA2035562A1 Direct current traveling wave motor |
| 08/21/1991 | EP0442469A1 Driving device for ultrasonic wave motor |
| 08/20/1991 | US5041750 Vibration wave driven apparatus |
| 08/20/1991 | US5041132 Blood pump |
| 08/14/1991 | EP0441540A1 Vibration wave driven motor |
| 08/14/1991 | DE4002254A1 Ultraschallmotor mit zwei rotoren Ultrasonic motor with two rotors |
| 08/07/1991 | EP0440491A1 Vibration wave driven motor |
| 07/30/1991 | US5036263 Piezoelectric actuator driving apparatus |
| 07/30/1991 | US5036245 Ultrasonic linear motor |
| 07/27/1991 | WO1991011850A1 Ultrasonic motor with two rotors |
| 07/27/1991 | CA2049990A1 Ultrasound motor having two rotors |
| 07/23/1991 | US5034647 Inchworm type driving mechanism |
| 07/23/1991 | US5034646 Composite resin with filler |
| 07/17/1991 | EP0437319A1 Vibration wave driven motor apparatus |
| 07/17/1991 | EP0437050A1 Vibration wave driven apparatus |
| 07/16/1991 | US5032754 Piezoelectric transducer for an ultrasonic motor |
| 07/16/1991 | US5032753 Piezoelectric transducer and an ultrasonic motor using the piezoelectric transducer |
| 07/10/1991 | EP0436336A2 Vibration wave driven apparatus |
| 07/03/1991 | EP0435496A1 A vibration driven motor and thermal jet type printer using the same |
| 07/02/1991 | US5028833 Ultrasonic motor |
| 07/02/1991 | US5028832 Ultrasonic motor having anisotropic properties |
| 06/27/1991 | WO1991009428A1 Stepping motor to drive a body, especially a shaft, through small angles of rotation per step |
| 06/25/1991 | US5027028 Piezoelectric motor |
| 06/25/1991 | US5025766 Fuel injection valve and fuel supply system equipped therewith for internal combustion engines |
| 06/20/1991 | DE4038020A1 Stepper motor turning shaft through small angle - by intermittent drive from flexible connection part carrying piezoelectric element and overcoming spring elements |
| 06/19/1991 | EP0432971A1 Ultra-sonic motor driving circuit |
| 06/18/1991 | US5025186 Ultrasonic motor |
| 06/11/1991 | US5023526 Vibratory motor |
| 06/04/1991 | US5021700 Driving apparatus for ultrasonic motor |
| 05/30/1991 | WO1991008594A1 Multi-surface-sensor control unit for a travelling-wave motor |
| 05/30/1991 | CA2045459A1 Multiple-surface sensor control for a traveling wave motor |
| 05/21/1991 | US5017823 Vibration wave driven actuator |
| 05/21/1991 | US5017820 Piezoelectric rotary union system |
| 05/21/1991 | US5017266 Piezoelectric transducer |
| 05/08/1991 | EP0426042A1 Driving device for ultrasonic motor |
| 05/07/1991 | US5014321 Wide passband omnidirectional loudspeaker |
| 05/07/1991 | US5013982 Circuit for driving ultrasonic motor |
| 05/07/1991 | US5013958 X-Y stage with ultrasonic actuator |
| 05/07/1991 | US5013956 Wear resistance |
| 05/01/1991 | CN1012544B Annular triple-lamina piezoelectric supersonic vibrator and its clamping supersonic micromotion motor |
| 04/24/1991 | EP0424141A2 Drive control circuit for an ultra-sonic stepping motor |
| 04/24/1991 | EP0424139A2 Ultrasonic motor |
| 04/23/1991 | US5010222 Driving device for ultrasonic wave motor |
| 04/16/1991 | US5008581 Piezoelectric revolving resonator and single-phase ultrasonic motor |
| 04/16/1991 | US5008580 Piezoelectric vibration generator and vibratory parts feeder incorporating the same |
| 04/09/1991 | US5006746 Travelling-wave motor |
| 04/04/1991 | WO1991004584A1 Miniature actuator |
| 04/03/1991 | EP0420622A2 Frictional material for vibration motor |
| 04/02/1991 | US5004964 Control apparatus for vibration driven motor |
| 04/02/1991 | US5004945 Piezoelectric type actuator |
| 03/19/1991 | US5001404 Vibration wave motor |
| 03/19/1991 | US5001382 Stepping motor and a method of driving the same |
| 03/13/1991 | EP0416884A2 Vibration wave driven motor |
| 03/06/1991 | EP0415657A2 Vibrator-type actuator |
| 03/05/1991 | US4998048 Driving device for vibration wave driven motor |
| 03/05/1991 | US4998016 Probe unit, driving method thereof, and scanning device for detecting tunnel current having said probe unit |
| 02/20/1991 | EP0413397A1 Electro-mechanical transducer and positioning device comprising such an electro-mechanical transducer |