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| Number | Title | Issue Date |
| 8110967 | Spherical rotary piezoelectric motor A spherical rotary piezoelectric motor comprises a spherical rotor, a hemispherical stator, and a plurality of piezoelectric actuators. The hemispherical stator comprises an inner surface and an outer surface, wherein the inner surface forms a hemispherical hollow p... | 02/07/2012 |
| 7482738 | Piezoelectric thin-film resonator and filter A piezoelectric thin-film resonator includes a lower electrode formed on a substrate to define a rounded dome-shaped cavity between the lower electrode and the substrate, a piezoelectric film provided on the lower electrode, and an upper electrode provided on the pi... | 01/27/2009 |
| 7437817 | Process for fabricating hollow electroactive devices A process for fabricating a ceramic electroactive transducer of a predetermined shape is disclosed. The process comprises the steps of providing a suitably shaped core having an outer surface, attaching a first conductor to the outer surface of the core, coating an ... | 10/21/2008 |
| 7321185 | Active multistable twisting device Two similarly shaped, such as rectangular, shells are attached to one another such that they form a resulting thin airfoil-like structure. The resulting device has at least two stable equilibrium shapes. The device can be transformed from one shape to another with a... | 01/22/2008 |
| 7205707 | Laser machining of electroactive ceramics Laser beam machining is applied to form arbitrarily shaped electroactive ceramics for transducers (e.g., electromechanical sensors and actuators). One particularly preferred embodiment of the invention comprises machining parallel grooves in a ceramic plate to impro... | 04/17/2007 |
| 7180227 | Piezoelectric o-ring transducer An o-ring sealing device, molded with an imbedded piezoelectric element, for use in vacuum systems. The imbedded element, of a circumferential length, has an oblong cross-sectional shape, the oblong shape having a pair of ends for externally connecting to a signal p... | 02/20/2007 |
| 7081701 | Curved shape actuator device composed of electro active layer and fiber composite layers The piezo-composite curved actuator of the present invention includes a piezoelectric layer 10, a lightweight fiber-reinforced lower composite layer 20 with a high GTE (coefficient of thermal expansion) and a low modulus, which is placed under the piez... | 07/25/2006 |
| 7072703 | Medical device with force monitoring features and method therefor A medical device for use with an implantable lead includes a force monitoring system coupled with the device. The force monitoring system monitors force placed on the medical device and/or the lead. Optionally the system compares the force with a preset limit, and n... | 07/04/2006 |
| 7028529 | Apparatus and methods for testing acoustic probes and systems Methods and apparatus are provided for testing an acoustic device that has multiple transducing elements adapted for conversion between acoustic and electrical signals. An electrical transmission signal is generated. The electrical transmission signal is transmitted... | 04/18/2006 |
| 6979937 | Laser machining of electroactive ceramics Laser beam machining is applied to form arbitrarily shaped electroactive ceramics for transducers (e.g., electromechanical sensors and actuators). One particularly preferred embodiment of the invention comprises machining parallel grooves in a ceramic plate to impro... | 12/27/2005 |
| 6723524 | Immunoassay method and kit An immunoassay, e.g. ELISA, method and kit for determining (preferably quantitatively) an analyte adsorbed at a surface or present in a liquid sample, comprising binding the analyte to a solid phase, attaching a marker to the analyte, and detecting marker attached t... | 04/20/2004 |
| 6654993 | Process for fabricating hollow electroactive devices A process for fabricating a ceramic electroactive transducer of a predetermined shape is disclosed. The process comprises the steps of providing a suitably shaped core having an outer surface, attaching a first conductor to the outer surface of the core, ... | 12/02/2003 |
| 6455985 | Pressure and temperature transducer A pressure- and temperature-sensitive transducer comprises a tubular housing, a resonator located within the housing and end caps closing the ends of the housing. The resonator is located in a radial plane with respect to the housing and is connected to t... | 09/24/2002 |
| 6342749 | Vibration exciter A curved piezoelectric device is attached to a plate to vibrate the plate. Mass-loading is applied to at least one free end of the piezoelectric device to increase output.... | 01/29/2002 |
| 6222304 | Micro-shell transducer A micro-shell transducer includes a substrate; an electro-active medium mounted on the substrate and including an arched section spaced from the substrate defining a chamber between the substrate and arched section; and a pair of electrodes mounted on the... | 04/24/2001 |
| 6215231 | Hollow sphere transducers An electroactive device incorporating the invention is configured from an electroactive ceramic hollow sphere having an inner surface, an outer surface, a wall thickness aspect and a radius aspect. Conductive electrodes are positioned on opposed surfaces ... | 04/10/2001 |
| 6191524 | Piezoelectric vibrators A piezoelectric vibrator using thickness mode as the primary vibration and having a cross section of a bevel or convex configuration is provided which is superior in mechanical strength, easy to steadily mount, and has a small dispersion of characteristic... | 02/20/2001 |
| 6111340 | Dual-mode thickness-shear quartz pressure sensors for high pressure and high temperature applications A dual-mode thickness-shear quartz pressure transducer includes a unitary piezoelectric crystal resonator and cylindrical housing structure wherein the resonator is located on a median radial plane of the housing and the exterior of the housing is provide... | 08/29/2000 |
| 6097135 | Shaped multilayer ceramic transducers and method for making the same A shape formed multi-laminate transducer which conforms to nonlinear dependent shaped geometries and the shape forming process for producing the nonlinear dependent shaped multilaminate transducer is presented. The shape forming process includes the cutti... | 08/01/2000 |
| 5781509 | Wide beam array with sharp cutoff A transducer array is constructed from a constant arc length portion of a ght circular cylindrical shell of piezoelectric transduction material. The constant arc length portion is segmented evenly along the length thereof to define a plurality of transduc... | 07/14/1998 |
| 5621264 | Water craft using piezoelectric materials A flexible layer of piezoelectric material, e.g., a known PVDF polymer, is used for generating electrical energy for use on a water craft. In one arrangement, the sheet is laminated within a craft hull of fiberglass. Electrodes are provided for the major ... | 04/15/1997 |
| 5589725 | Monolithic prestressed ceramic devices and method for making same Monolithic, internally asymmetrically stress biased electrically active ceramic devices and a method for making same is disclosed. The first step in the method of the present invention is to fabricate a ceramic element having first and second opposing sur... | 12/31/1996 |
| 5149197 | Piezo electric resonator temperature sensor The temperature of a quartz crystal oscillator is determined by comparison of a pair of inharmonically related overtone oxcillations of the same vibrational type, e.g. a thickness shear mode, and of the same overtone order. The use of inharmonically relat... | 09/22/1992 |
| 5042492 | Probe provided with a concave arrangement of piezoelectric elements for ultrasound apparatus In order to make a probe having a concave attack face, a continuous acoustic transition blade (5) is used. Said blade is metallized (7) and is common contact with all the front metallizations (6) of the piezoelectric elements of the probe. The rear metall... | 08/27/1991 |
| 4869768 | Ultrasonic transducer arrays made from composite piezoelectric materials A method for providing a curved composite ultrasound transducer of a relatively large size. A blank of piezoceramic material has its rear side reticulated with a series of relatively coarse grooves. The front side of the material is reticulated with a ser... | 09/26/1989 |
| 4787126 | Method of fabricating dark field coaxial ultrasonic transducer A dark field ultrasonic transducer is constructed with an outer annular spherical or conical transducer element and an inner spherical element. The outer annular element is excited and insonifies a small portion of a part surface near a discontinuity or c... | 11/29/1988 |
| 4751534 | Planarized printheads for acoustic printing The output surface of an acoustic printhead having one or more concave acoustic beam forming devices for supplying focused acoustic beams to eject droplets of ink on demand from the surface of a pool of ink is planarized by filling those concave devices w... | 06/14/1988 |
| 4635079 | Single element transducer for an ink jet device The ink ejecting portion of an ink jet printer is described, wherein a single ceramic transducer is used to create the pressure for the ink droplets. Unlike prior devices, the transducer is a one-piece member as opposed to use of a crystal and diaphragm. ... | 01/06/1987 |
| 4488010 | Loudspeaker A loudspeaker primarily for the high frequency audio region includes a driving device coupled to a diaphragm of convex outer configuration and extending over more than 180° spherical angle. The driving device changes the distance between the two coupling... | 12/11/1984 |
| 4308547 | Liquid drop emitter A liquid drop emitter utilizing acoustical principles ejects liquid from a body of liquid onto a moving document to form characters or bar codes thereon.... | 12/29/1981 |
| 4276491 | Focusing piezoelectric ultrasonic medical diagnostic system There is disclosed an ultrasonic piezoelectric transducer consisting of two separate transducer elements bonded together. The individual elements may be similar or different in size, thickness, and/or material. The material which bonds the two elements to... | 06/30/1981 |
| 4257020 | Piezoelectric resonator A piezoelectric resonator comprises a crystal having an outer peripheral portion connected to a central portion by an intermediate zone which is short in the radial direction, is hollowed out over its major part and has at least two connector bridges betw... | 03/17/1981 |
| 4228532 | Piezoelectric transducer An electroacoustic transducer having high acoustic-to-electric energy conversion per unit volume. The transducer is in the form of a body having a cylindrical central section and hemispherical end sections, the central section and the end sections formed ... | 10/14/1980 |
| 4228352 | Apparatus for measuring the concentration of gases A tubular measuring chamber (3) is described for temporarily holding alveolar breath for determining the quantity of alcohol in the breath of infra red radiation absorption. The radiation path length between an I.R. source (1, 2) and a condenser lens (7) ... | 10/14/1980 |
| 4184094 | Coupling for a focused ultrasonic transducer A piezoelectric crystal has a concave active surface and a high acoustical impedance. A flat layer of molded material having a low acoustical impedance faces the active surface of the crystal to form a space therebetween. An intermediate layer of molded m... | 01/15/1980 |
| 4068144 | Liquid jet modulator with piezoelectric hemispheral transducer A modulator for the generation of uniform liquid drops over a wide bandwidth of drop rates is provided. The concave and convex surfaces of a hemispherical piezoelectric crystal are electroded, and the transducer formed thereby is seated within and bonded ... | 01/10/1978 |
