Did You Know...
...that a workman who left the soap mixing machine on too long was responsible for making Ivory Soap? He was so embarrassed by his mistake that he threw the mess in a stream. Imagine his dismay when the evidence of his error floated to the surface! Result: Ivory soap, the soap that floats.
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| Number | Title | Issue Date |
| 7372776 | Modal acoustic array transduction apparatus A transduction apparatus, which employs an array of individual transducers that generates multiple acoustic radiation modes, is described. These modes are used together to yield directional steered beam patterns. In one embodiment separate transducers, clustered in ... | 05/13/2008 |
| 7321115 | Sensor housing having locking member with multiplicity of angular rotations and methods of aligning A housing 200 for securing a photo sensor 405 where the housing includes a lower body 211 configured to selectively engage a base 203 at one of a multiplicity of angular rotations relative to the base and an upper body 209 configur... | 01/22/2008 |
| 7319639 | Acoustic concealed item detector The present invention is directed towards an acoustic concealed item detector and related methods for detection using acoustics. In an illustrative embodiment, a multi-frequency ultrasonic wave generator generates in a gaseous medium at least first and second ultras... | 01/15/2008 |
| 7262542 | Ultrasound radiation device into a material When input electric signals Ei (i=1, 2, . . . , n) with frequencies fi (i=1, 2, . . . , n), respectively, are applied to an input interdigital transducer, elastic waves are excited in a piezoelectric substrate. Leaky components of the elastic w... | 08/28/2007 |
| 7009326 | Ultrasonic vibration apparatus use as a sensor having a piezoelectric element mounted in a cylindrical casing and grooves filled with flexible filler An ultrasonic vibration apparatus includes a casing having a vibration face, a piezoelectric element mounted in the casing, and a disk-like vibration plate supported at a position along a concentric circle differentiating two regions, an inner region and an outer re... | 03/07/2006 |
| 6949074 | Method and apparatus for fetal audio stimulation The present invention is a method and apparatus for applying a focused, directed audio beam at a fetus to stimulate the fetus in utero. An ultrasound signal is amplitude modulated with an audio range signal, and directed to an ultrasound transducer positioned on the... | 09/27/2005 |
| 6925187 | Horn array emitter A sonic emitter, horn array with enhanced emitter-to-air acoustic coupling, with particular application to ultrasonic frequencies. The emitter comprises a plate support member having opposing first and second faces separated by an intermediate plate body. The plate ... | 08/02/2005 |
| 6919669 | Electro-active device using radial electric field piezo-diaphragm for sonic applications An electro-active transducer for sonic applications includes a ferroelectric material sandwiched by first and second electrode patterns to form a piezo-diaphragm coupled to a mounting frame. When the device is used as a sonic actuator, the first and second electrode... | 07/19/2005 |
| 6784600 | Ultrasonic membrane transducer for an ultrasonic diagnostic probe The invention is directed towards structures for use with micro-formed membrane ultrasonic transducers, and methods for fabricating the structures. In one embodiment, the transducer includes a planar member having a piezoelectric material and spaced apart electrodes... | 08/31/2004 |
| 6640631 | System and measuring sound velocity in material A system for measuring sound velocity in material comprises a piezoelectric substrate, first- and second comb-shaped electrodes, and a counter electrode in contact with a surface-part of a material. When input electric signals Ei having carrier... | 11/04/2003 |
| 6637268 | Vibration displacement sensing system A vibration displacement sensing system comprises a piezoelectric substrate, first- and second comb-shaped electrodes, a counter electrode, and a signal analyzer. When input electric signals are applied between the first comb-shaped electrode and the coun... | 10/28/2003 |
| 6337835 | Electromechanical converter and method of producing same The present invention relates to an electromechanical converter, a method of manufacturing same, as well as to a composite system including the electromechanical converter. The inventive electromechanical converter consists of at least one elongate fiber ... | 01/08/2002 |
| 6317389 | Ultrasound-signal radiating device An ultrasound-signal radiating device comprises a piezoelectric substrate, a first input interdigital transducer, a second input interdigital transducer, an output interdigital transducer, a cap, an amplifier, and a modulator with an input terminal. All t... | 11/13/2001 |
| 6108275 | Phased beam transducer A phased-beam transducer is disclosed for transmitting and receiving steered acoustic beam signals that includes a sheet of piezoelectric material such as Polyvinylidene Fluoride (PVDF), a copolymer, piezo-rubber, quartz, 1-3 PZT composite, or similar tra... | 08/22/2000 |
| 5991239 | Confocal acoustic force generator An acoustic transducer has two separate elements which are driven by separate signal generators to produce two acoustic beams that focus at the same target location. The two acoustic beams interact at the target location to produce a beat force. The targe... | 11/23/1999 |
| 5750272 | Active and adaptive damping devices for shock and noise suppression Active and adaptive vibration damping devices are provided. The damping devices include heterostructures having a layer of ferroelastic or SME material coupled with a first and second layer of ferroelectric material having a layer of dielectric material t... | 05/12/1998 |
| 5550793 | Unidirectional wave transducer The invention concerns unidirectional ground-wave transducers using an alternating series of emitter cells (E) and reflector cells (R). The invention consists in using, in the emitter cells (E), fingers having a width of λ/3 spaced apart by a distance of 2 λ... | 08/27/1996 |
| 5530683 | Steerable acoustic transducer An acoustic transducer is constructed as a stacked configuration of multiyer transducer elements separated from one another by an electrical insulating material. Each multi-layer transducer element has a layer of acoustically transparent electro-acoustic... | 06/25/1996 |
| 5471721 | Method for making monolithic prestressed ceramic devices 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... | 12/05/1995 |
| 5142511 | Piezoelectric transducer A piezoelectric transducer having electrodes formed on both surfaces has a piezoelectric base molded as a curved plate which can converge sound fields of acoustic waves at an arbitrary point and which can reduce noise or reverberation in a lateral directi... | 08/25/1992 |
| 5072426 | Self-monitoring shock wave hydrophone The present invention relates to a hydrophone specifically designed for use in high pressure shock wave fields, comprising a thin piezoelectric polymer film secured to a rigid hoop structure, having a centrally located active element and two conducting le... | 12/10/1991 |
| 5056069 | Ultrasonic sensor An ultrasonic sensor which is particularly suited to measuring the sound-pressure amplitude in the focus range of a lithotripter and includes in a region a piezoelectrically activated polymeric foil, which is coupled to electrodes. The polymeric foil is m... | 10/08/1991 |
| 5001681 | Monolaminar piezoelectric bender bar A single stack of double poled piezoelectric ceramic elements (202) create a monolaminar bender bar (200) which can be used in acoustic applications. The stack is lined up such that adjacent elements (202) in bender bar (200) have oppositely poled top and... | 03/19/1991 |
| 4950936 | Piezoelectric sandwich polymer transducer A sensor, having a sandwich configuration, is able to sense a transduce out parameter in situ without significantly affecting the parameter. The sensor comprises an inner sheet of a polymer having a transducer property. A conductive layer is deposited on... | 08/21/1990 |
| 4933919 | Hydrophone A hydrophone having a hollow interior with signal electrodes on the interior surface and an electrically conducting coating over the entire outside surface. Signal leads are connected to the inside electrodes and the outside electrically conducting surfac... | 06/12/1990 |
| 4914565 | Piezo-electric transducer having electrodes that adhere well both to ceramic as well as to plastics The invention is directed to a piezo-electric transducer having electrodes that adhere well both to ceramic as well as to plastics and that are composed of intrinsically conductive plastic. The invention is also directed to a method for the manufacture th... | 04/03/1990 |
| 4835747 | Compensating sensor device for a charge amplifier circuit used in piezoelectric hydrophones To compensate for the effect of external parameters on piezoelectric sensors connected to a charge amplifier, a small portion of this sensor is used to form the feedback capacitor of the amplifier. These parameters then have the same effect on the sensor ... | 05/30/1989 |
| 4780860 | Beam forming device The present invention relates to a beam forming device for forming a uniform radiation beam and/or a reception beam. In radiation, the transducer is vibrated in such a way that the pressure of a sound wave produced from each point of the vibrating surface... | 10/25/1988 |
| 4734611 | Ultrasonic sensor The invention concerns an ultrasonic sensor (24) in which a polymer foil (4) supported in its peripheral area is piezoelectrically activated at least in a partial section (42). The partial section (42) is electrically coupled to electrodes (8). According ... | 03/29/1988 |
| 4725994 | Ultrasonic transducer with a multiple-folded piezoelectric polymer film An ultrasonic transducer includes a piezoelectric polymer film folded as at least two layers and having electrodes on both the surfaces thereof. The ultrasonic transducer is responsive to a signal, applied across electrodes, to produce an ultrasonic wave ... | 02/16/1988 |
| 4709360 | Hydrophone transducer with negative feedback system An acoustic transducer, especially adapted for hydrophones, is disclosed. The transducer comprises a piezoelectric ceramic disk with a main or signal electrode, a common electrode and a feedback electrode; negative feedback is provided around an associate... | 11/24/1987 |
| 4706229 | Electroacoustic transducer An electroacoustic transducer ring has an inner vibratile surface defining a ring cavity with a plurality of arcuately spaced electrodes affixed thereto. Planar partitions are placed in the ring cavity. The partition edges are parallel to the ring axis an... | 11/10/1987 |
| 4704556 | Transducers A transducer for effecting conversion between stress wave energy and electrical energy comprising a plurality of individual electrically conductive electrode elements presenting an array of coplanar electrode element faces, an overlying sheet of dielectri... | 11/03/1987 |
| 4399387 | Ultrasonic wave transducer An ultrasonic wave transducer capable of generating a convergent ultrasonic sound beam has been found. The transducer comprises a piezoelectric substrate, at least one interdigital electrode group arranged on the surface of the piezoelectric substrate, ea... | 08/16/1983 |
| 4347593 | Piezoceramic tubular element with zero end displacement A piezoelectric tubular monopole element with zero end displacement which s an omnidirectional sensitivity over the widest possible frequency range. The center section is radially or thickness-poled and the end sections are longitudinally or length-poled.... | 08/31/1982 |
| 4344159 | Ultrasonic transducer An ultrasonic signal transducer is characterized in that the piezoelectrically active element has a first unitary electrode over the entire surface of one face and a matrix of a plurality of individual electrodes on the opposite face. In the receive mode,... | 08/10/1982 |
| 4315324 | Directly modulated sonobuoy transmitter using surface acoustic wave sensor Serving as a hydrophone in the lower unit of the sonobuoy, two surface acoustic wave resonators for determining the resonant frequency of two independent oscillators are also used to sense pressure and thus sound. The outputs of the two resonators are mix... | 02/09/1982 |
| 4296348 | Interdigitated electrode ultrasonic transducer An ultrasonic transducer including a thin piezo-electric substrate and an interdigital electrode radiating ultrasonic wave beams with excellent focusing characteristics into a liquid medium in contact with the substrate by applying AC voltages to the elec... | 10/20/1981 |
| 4268912 | Directional hydrophone suitable for flush mounting A substantially flat and disc-like shaped sound transducer for sensing sound waves in a fluid transmission medium and having directional and omnidirectional response characteristics to the sound waves. The sound transducer having a circular vibratile plat... | 05/19/1981 |
| 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 |
