Class 73/514.28 - Surface acoustical wave

Subclass of Class 73 - Measuring and testing
Definition: Subject matter wherein a change in a characteristic of an
No. of patents: 26
Last issue date: 10/14/2008

Number	Title	Issue Date
7434989	SAW temperature sensor and system A temperature measurement system is characterized by at least one passive surface acoustic wave (SAW) temperature sensor. The sensor includes at least one piezoelectric substrate having an interdigital SAW transducer disposed upon the piezoelectric substrate for con...	10/14/2008
7380454	Load beam for surface acoustic wave accelerometer Methods and systems for forming accelerometers include forming a load beam supported at one end having an input interdigital transducer (IDT) and an output IDT. The load-beam has a cross section varying in the longitudinal direction effective to cause the load beam ...	06/03/2008
7245062	Device for converting mechanical energy into electrical energy An apparatus for conversion of mechanical energy to electrical energy having a piezo transducer (1), which is formed from two or more layers, and having a mass/spring system (2, 3, 4), which can oscillate, in a holder (5), which is caused (6	07/17/2007
7243544	Passive and wireless acoustic wave accelerometer An acoustic wave acceleration sensor comprises an acoustic wave device including a plate that functions as a propagation medium and at least one interdigital transducer configured upon the plate. One or more antennas can be integrated with the acoustic wave device, ...	07/17/2007
7112911	Vibrational power generation device vibrator Unnecessary moment in a vibrator is remarkably reduced and the power generation efficiency in capacitance-type vibrational power generation is remarkably improved. A vibrator provided in a variable-capacitance type vibrator has a structure in that one ends of oscill...	09/26/2006
7038353	Surface acoustic wave device and method of manufacturing the same The invention provides a piezoelectric substrate in the form of a rectangular plate in which a Rayleigh wave is propagated, and an IDT and a reflector are provided by forming interdigital electrodes on the piezoelectric substrate. At least an end face on a shorter s...	05/02/2006
6948371	Acoustic wave touch detecting apparatus An FPC is constructed of two FPC branches, and a connection line that connects to a controller. Printed wiring of the connection line includes ten printed wires. The central four printed wires are signal reception wires, which are connected to two converters (sensor...	09/27/2005
6803698	Acceleration sensor An acceleration sensor including a bimorph type acceleration detection element including a pair of surface acoustic wave resonators laminated to each other with the back surface of one resonator bonded to the back surface the other resonator. Each resonator includes...	10/12/2004
6553836	Surface acoustic wave (SAW) accelerometer A monolithic low cost, high frequency surface acoustic wave (SAW) accelerometer is provided that is operable in high impact and vibration applications....	04/29/2003
6237417	Apparatus for measuring impedance of a resonant structure Apparatus for measuring the value of a physical quantity which affects the impedance of an electrically resonant structure, the apparatus comprising an electrically resonant structure, an RF electrical energy source, a bidirectional RF transmission line c...	05/29/2001
5684456	Tilt-sensor A tilt-sensor for detection of a tilt angle is proposed, in particular for use as a roll-over sensor in a car for activation of an occupant protection device, comprising a massive body and an associated receptacle and having the following features: the re...	11/04/1997
4920801	Accelerometer An accelerometer capable of sensing acceleration in three orthogonal directions while being formed in a single silicon wafer comprises three cantilever beams (2) etched from the wafer, each having a mass (3) asymmetric to the neutral plane (A) of the beam...	05/01/1990
4803883	Accelerometer An accelerometer comprising a frame having an input axis (y) and a cross axis (x) orthogonal to and co-planar with the input axis. The accelerometer has a flexible beam coupled to a proofmass. The beam is supported at a pivot location. A rotator coupled t...	02/14/1989
4676104	Surface skimming bulk acoustic wave accelerometer An accelerometer includes a cantilevered pieozelectric beam mounted to a surface inside a fluid filled chassis with a proof mass attached to the beam's free end. Surface skimming bulk wave delay lines are mounted on opposing major surfaces of the beam and...	06/30/1987
4621530	Surface acoustic wave accelerometer A differential surface acoustic wave (SAW) accelerometer comprises a resilient beam 1 one end of which is clamped in a support 2. Opposite faces of the beam are provided with SAW transducers 3, 4 and 6, 7 which respectively form delay lines driven by osci...	11/11/1986
4598587	Surface acoustic wave accelerometer An accelerometer comprises a quartz beam 1 having on its upper and lower faces surface acoustic wave devices 2, 3 and 2', 3'. The beam is centrally mounted on quartz spacers 4, 5 which have metallized contacts for the lower SAW device. The spacers are car...	07/08/1986
4573357	Elastic surface wave force sensor The invention provides a sensor comprising a plate resting on two supports by simply bearing thereon, for creating in said plate uniform bending stresses in a defined zone of said plate. Detector means for detecting the stresses undergone by said plate ma...	03/04/1986
4566329	Vectorial force sensor with elastic surface waves The vectorial force sensor with elastic surface waves according to the invention comprises a mechanical part, for example a lamella, subjected to a stress (ς). One face of the lamella incorporates transducers maintaining an elastic surface wave. The syst...	01/28/1986
4515016	Elastic surface wave accelerometers An elastic surface wave accelerometer having a deformable structure, fixed at one end and providing at its free end a seismic mass. The deformable structure may be an open frame with a single post or a closed frame with two posts. The accelerometer can me...	05/07/1985
4467235	Surface acoustic wave interferometer Disclosed is a surface acoustic wave interferometer, including a substrate on which are disposed a first reflector and a second reflector so as to define a multimode resonant cavity therebetween. A third reflector is positioned on the substrate so that a ...	08/21/1984
4346597	Dual range, cantilevered mass accelerometer A dual range accelerometer includes a mass 10 supported on a cantilevered beam 12, there being stops 70, 71 such that for low accelerations the beam acts as a cantilever and for high accelerations, one of the stops causes the beam to flex as a beam suppor...	08/31/1982
4333342	Fluid damped saw accelerometer An accelerometer comprising a mass 10 supported on a piezoelectric cantilevered beam 12 with SAW resonators 17, 46 disposed on the surface of the beam includes cover plates 66, 68 over the SAW resonators and sealed to the beam by seals 70, 72 which may be...	06/08/1982
4306456	Elastic wave accelerometer The invention discloses an elastic wave accelerometer for measuring acceleration at least in one direction. The device comprises a solid support, a seismic mass and a piezoelectric wafer embedded in the seismic mass and in the solid support. An accelerati...	12/22/1981
4301683	Elastic surface wave accelerometer The invention relates to an accelerometer comprising at least one elastic plate propagating elastic surface waves, to which a normal force is applied resulting from the action of the acceleration which is to be measured on a solid or liquid body of predet...	11/24/1981
4199990	Elastic surface wave accelerometer The invention relates to accelerometers comprising a vibrating elastic body associated with an electrical oscillator for maintaining its oscillations and a frequency measuring device for measuring its frequency. More particularly, the invention relates to...	04/29/1980
3940636	Acoustic delay surface wave motion transducer systems with enhanced stability Transducer devices employing relative changes in the acoustical propagation characteristics of surface waves traveling on opposite surfaces of a thin elastic cantilever beam yield a measure of the degree of flexing or surface strain of the elastic member....	02/24/1976

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Class 73/514.28 - Surface acoustical wave