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Class Information
Number: 310/323.21
Name: Electrical generator or motor structure > Non-dynamoelectric > Piezoelectric elements and devices > Combined with resonant structure > Direct mechanical coupling > Detector (e.g., sensor)
Description: Subject matter wherein the piezoelectric element has a characteristic which changes in response to a change in a physical parameter or condition, and assessment is made of the physical parameter or condition.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8657027 Single piezo-actuator rotary-hammering (SPaRH) drill Feb. 25, 2014
8604668 Piezoelectric element, piezoelectric sensor, electronic device, and method for manufacturing piezoelectric element Dec. 10, 2013
8555718 Piezoelectric transducers Oct. 15, 2013
8511163 Self-exciting, self-sensing piezoelectric cantilever sensor Aug. 20, 2013
8515135 PLL adjustment to find and maintain resonant frequency of piezo electric finger print sensor Aug. 20, 2013
8481335 Specificity and sensitivity enhancement in cantilever sensing Jul. 9, 2013
8322218 Surface acoustic wave element and equipment for measuring characteristics of liquid material Dec. 4, 2012
8176773 Piezoelectric sensor and sensing instrument May. 15, 2012
8150462 Connection box Apr. 3, 2012
8102101 Piezoelectric sensors Jan. 24, 2012
8080922 Ultrasonic sensor having a cover including a damping element Dec. 20, 2011
8004152 Electronic tongue sensor Aug. 23, 2011
7876023 Piezoelectric/electrostrictive membrane sensor Jan. 25, 2011
7812506 Piezoelectric/electrostrictive membrane type measuring device Oct. 12, 2010
7741745 Attaching structure of resolver, dynamo-electric machine and attaching method of resolver Jun. 22, 2010
7663295 Method and system for measuring physical parameters with a piezoelectric bimorph cantilever in a gaseous or liquid environment Feb. 16, 2010
7576472 Ultrasonic motor Aug. 18, 2009
7573180 Ultrasonic motor Aug. 11, 2009
7555952 Sensing device Jul. 7, 2009
7555947 Air pressure sensor Jul. 7, 2009
7554247 Component measuring device Jun. 30, 2009
7482732 Layered surface acoustic wave sensor Jan. 27, 2009
7466066 Longitudinally driven slotted cylinder transducer Dec. 16, 2008
7397167 Ultrasonic wave generating device Jul. 8, 2008
7368855 Piezoelectric vibration sensor May. 6, 2008
7161280 Ultrasonic transducer and method of joining an ultrasonic transducer Jan. 9, 2007
6848299 Quartz crystal microbalance with feedback loop for automatic gain control Feb. 1, 2005
6763285 Adaptive compensation of sensor run-out and mass unbalance in magnetic bearing systems without changing rotor speed Jul. 13, 2004
6424077 Manipulator Jul. 23, 2002
6392827 Drive and guide mechanism and apparatus using the mechanism May. 21, 2002
6194811 Drive apparatus Feb. 27, 2001
6147434 Drive device using electromechanical transducer and apparatus equipped with the device Nov. 14, 2000
5890643 Low mass ultrasonic bonding tool Apr. 6, 1999
5815079 Device for establishing and/or monitoring a predetermined filling level in a container Sep. 29, 1998
5631633 Device for determining and/or monitoring a predetermined material level in a container May. 20, 1997
5596145 Monolithic resonator for vibrating beam force sensors Jan. 21, 1997
5568004 Electromechanical positioning device Oct. 22, 1996
5520050 Driving and detecting circuit of a vibrator May. 28, 1996
5430341 Miniaturized power supply for an electroactive actuator Jul. 4, 1995
5408168 Device for determining and/or monitoring a predetermined filling level in a container Apr. 18, 1995
5389849 Tactility providing apparatus and manipulating device using the same Feb. 14, 1995
5375336 Gyro-compass Dec. 27, 1994
5302878 High-frequency acoustic rheometer and device to measure the viscosity of a fluid using this rheometer Apr. 12, 1994
5281899 Electrical drive for a segmented transducer Jan. 25, 1994
5264831 Device for determining and/or monitoring a predetermined contents level in a container Nov. 23, 1993
5264755 Stepping motor to drive a body, especially a shaft, through small angles of rotation per step Nov. 23, 1993
5204576 Device for driving a piezoelectric element Apr. 20, 1993
5191316 Apparatus for determining and/or monitoring a predetermined contents level in a container Mar. 2, 1993
5190383 Dot printing apparatus Mar. 2, 1993
5179028 Antibody coated crystal chemical sensor Jan. 12, 1993

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