U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Icon_funbox Celebrity Inventors

Comic actor Danny Kaye received patent D166,807 for the co-design of "Blowout Toy or the Like". It's similar to one of those toys that unravels when you blow into at a birthday party except Kaye's has three blowouts going in different directions, not just one.

Newsletter  PatentStorm News

Make the Most of Our Site

See this month's Top Inventors and Most Cited Patents.

Stay on top of the latest innovations by subscribing to an RSS feed.

Registered users: Manage your profile.

 

Class 310/800 - PIEZOELECTRIC POLYMERS (E.G., MYLAR, PVDF)


Subclass of Class 310 - Electrical generator or motor structure
Definition: Polymeric materials which are disclosed as being either
No. of patents: 421
Last issue date: 05/22/2012


                9      
NumberTitleIssue Date
4469978Electrode arrangement for a folded polymer piezoelectric ultrasonic detector
An ultrasonic detector is provided wherein electrodes are formed on the front and rear surfaces of a high polymer piezoelectric film, such that opposing electrode portion and nonopposing electrode portions are alternately and continually formed, most part...
09/04/1984
4469920Piezoelectric film device for conversion between digital electric signals and analog acoustic signals
A piezoelectric film transducer useful in directly converting a digital signal into an acoustic analog signal; metallized film zones have different areas and are electrically insulated from each other; by selectively exciting different zones or groups of ...
09/04/1984
4469976Single-side connected transducer
A transducer is provided having interconnections between a conductive member and one side of a heat sensitive piezoelectric substrate such as PVF2 to or from which electric signals flow. The interconnections are positioned on one side of the su...
09/04/1984
4461179Device sensitive to pressure waves
A device sensitive to pressure waves including first and second sheets of polyvinylidene fluoride supported in spaced apart relationship. The major faces of each sheet are provided with respective inner and outer foils of copper and an electrically insula...
07/24/1984
4453044Electro-acoustic transducer with plural piezoelectric film
An acoustic transducer having a plurality of piezoelectric polymer films spaced apart and mounted at their peripheries upon a hollow support member, and physically connected together at center portions such that the films are parallel to each other at the...
06/05/1984
4451710Precisely stabilized piezoelectric receiver
An electrical to acoustic transducer utilizing the piezoelectric qualities of a polymer lamina and an arrangement including an amplifier and network to compensate for the polymer variability. This is accomplished by first providing two sets of electrodes ...
05/29/1984
4449134Composite ink jet drivers
An ink jet droplet exciter for generating pressure waves in a droplet generator. The preferred exciter is a composite made of PZT, Pb (Zr:Ti) O3, and a polyethylene supporting material. The mean diameter of the PZT particles is 7 mils and the e...
05/15/1984
4443730Biological piezoelectric transducer device for the living body
A biological transducer device for measuring blood pressure, heart pulse, heart sound etc. comprising a high molecular piezoelectric element which is in a thin film or ribbon form so that the transducer is very pliable so as to make close accurate contact...
04/17/1984
4442372Piezo electric apparatus for generating electricity
A variable pressure piezo electric generator comprised of a furnace chamber, a refrigerant chamber surrounding the furnace chamber in heat exchange relation thereto and a condensing chamber in communication with the refrigerant chamber. The refrigerant ch...
04/10/1984
4440983Electro-acoustic transducer with active dome
The invention relates to an electro-acoustic transducer using a self-supporting active radiating membrane made from a polymer material. The invention provides a transducer in which a resilient shape restoring member fixed to the case capped by the radiati...
04/03/1984
4435667Spiral piezoelectric rotary actuator
A piezoelectric rotary actuator including: a rotatable member; a spiral member fixed at its inner end to the rotatable member; one or more piezoelectric layers attached on one or both sides of the spiral member; means for rotatably supporting the rotatabl...
03/06/1984
4432237Ultrasonic transducer
Ultrasonic transducers, of an electrical capacitor formed of a counter-elrode and a synthetic material film lying thereon, held by a clamping ring and metallized on one side, are used amongst other things for running time measurements in flow field exami...
02/21/1984
4433400Acoustically transparent hydrophone probe
An acoustically transparent hydrophone probe consisting of a rigid hoop structure in which is secured an assembly of very thin piezoelectric polymer sheet material, such as polyvinylidene fluoride, with one or more very small central sensitive portions. I...
02/21/1984
4427912Ultrasound transducer for enhancing signal reception in ultrasound equipment
An ultrasonic transducer assembly having three layers. The front and back layers are made of piezoelectric materials, and are acoustically matched by the intermediate layer. The back layer functions as an ultrasound transmitter, and the front layer functi...
01/24/1984
4424465Piezoelectric vibration transducer
A piezoelectric vibration transducer is disclosed which includes a polymeric piezoelectric film as the active element. The film is a selectively or fully polarized, uniaxially oriented material selected from the group of polyvinylidene fluoride, blended m...
01/03/1984
4423768Piezoelectric polymer heat exchanger
Disclosed is apparatus for providing for increased heat transfer efficiency f a heat exchanger by separating contiguous fluid conductive channels by means of a flexible sheet fabricated from a piezoelectric polymer. An electrode pattern of predetermined co...
01/03/1984
4419599Piezoelectric transducer made from a polymer material and process for manufacturing same
Piezoelectric and pyroelectric transducers whose active element is formed by a polymer film. The transducer is manufactured from a flat polymer film by stretching this film over a mold so as to give it a self-supporting form and electroforming the stretch...
12/06/1983
4419598Piezoelectrically controlled piezoresistor
Electrically piezoresistor produced by means of a piezoresistive element coupled to an electromechanical transducer, whose terminals are the input terminals of the piezoresistor. The piezoresistor comprises thermal drift compensating means....
12/06/1983
4413202Transducer with a flexible sensor element for measurement of mechanical values
A transducer with a flexible sensor element for measurement of mechanical values, at least one flexible piezoelectric sensor element being provided for piezoelectrical or capacitive measurement, the opposite surfaces of the sensor element being at least p...
11/01/1983
4412148PZT Composite and a fabrication method thereof
A composite of PZT (Lead Zirconate Titanate) and a compliant polymer matrix aving 3-1 connectivity (i.e., in a diphasic material, one of the two phases is continuously self-connected in all three mutually perpendicular directions and the second phase is se...
10/25/1983
4412147Ultrasonic holography imaging device having a macromolecular piezoelectric element transducer
An ultrasonic image device such as may be used in a holography system or scanning system and having a piezoelectric transducer in which the conversion efficiency and phase are substantially constant over a wide frequency range. A piezoelectric sheet 5 μm...
10/25/1983
4407054Method of making electromechanical transducers using improved flexible composite piezoelectric material
A method of making flexible composite piezoelectric materials exhibiting hydrostatic response and having a stable response over time is given. A prepolymer material is combined with a piezoelectric material and polarized by applying an electric field whil...
10/04/1983
4406967Ultrasonic probe
The ultrasonic probe of this invention contains a uniaxially elongated polymer piezoelectric element in which the piezoelectric element provided at the both sides with a thin layer electrode is disposed such that at least one of the electrodes is divided ...
09/27/1983
4406323Piezoelectric heat exchanger
Apparatus is disclosed for providing increased heat transfer efficiency in a heat exchanger by separating contiguous fluid conductive channels by means of a flexible partition of a bimorph construction consisting of two adjacent layers of piezoelectric ma...
09/27/1983
4405402Piezoelectric/pyroelectric elements
Piezoelectric and pyroelectric elements made from polarized plastics substances such as polyvinylidene fluoride are of considerable interest in a number of fields. Unfortunately, they also suffer from a number of not insignificant drawbacks. Specifically,...
09/20/1983
4403382Process for manufacturing electromechanical transducers using at least one polymer film
The invention relates to the manufacture of electromechanical transducers with at least one element made from a polymer material shaped and polarized so as to obtain an active self-supporting structure having a nondevelopable surface and to a manufacturin...
09/13/1983
4404490Power generation from waves near the surface of bodies of water
For the purpose of converting the mechanical energy of surface waves on bodies of water, a power generating piezoelectric structure (10) is provided comprising piezoelectric material members, preferably in the form of one or a laminate of sheets (14) of s...
09/13/1983
4401910Multi-focus spiral ultrasonic transducer
An ultrasonic transducer providing a plurality of different focal lengths within a unitary structure and comprising a piezoelectric element having a cylindrical spiral surface with respective sections of the spiral surface providing respective different f...
08/30/1983
4400642Piezoelectric composite materials
A laminated structural device has the ability to change shape, position and resonant frequency without using discrete motive components. The laminate (10) may be a combination of layers (14,16) of a piezoelectrically active, non-conductive matrix material...
08/23/1983
4398173Safeness indicator for flexible shafts used in automotive steering mechanisms
In a vehicle steering system for automobiles, for example, a steering column is provided with a rotatable flexible shaft at the end thereof for improving the ability of the column to absorb energy in a crash situation. The flexible shaft has at least one ...
08/09/1983
4395652Ultrasonic transducer element
An ultrasonic transducer element includes a polymer piezoelectric film having a plurality of sections. The sections are defined by wave planes of ultrasonic waves having substantially λ/2 phase difference emanated from an imaginary focal point or line lo...
07/26/1983
4394773Fingerprint sensor
The fingerprint sensor transforms the fingerprint information of a finger under investigation into an electric output signal. The sensor incorporates a contact device or sensor plate of a piezoelectric material. This sensor plate has a contact surface. Th...
07/19/1983
4389445Data recording sheet
A data recording sheet in which data signals are stored in a polarizable macromolecular material sheet layer with polarization different locally in the direction of the surfaces of said sheet layer. The sheet layer causes pyroelectric or piezo-electric po...
06/21/1983
4383194Electro-acoustic transducer element
Electro-acoustic transducer element having its resonant frequency in a lower frequency range advantageously usable for diagnostic purposes comprises a polymeric piezoelectric film such as polyvinylidene fluoride film being coupled with an additional layer...
05/10/1983
4378721Pickup apparatus for an electric string type instrument
A pickup for an electric string type instrument comprising an elongated piezo-electric member formed by mixing a high molecular material with piezo-electric ceramic powder and a vulcanizing or cross-linking agent and then vulcanizing or cross-linking the ...
04/05/1983
4379246Polymeric piezoelectric drive element for writing jets in mosaic ink printing devices
A piezoelectric drive element which surrounds an ink channel in a writing jet in a mosaic printing device is a winding formed by plies of thin synthetic foil having piezoelectric properties. The plies of the foil contact adjacent plies over large areas of...
04/05/1983
4376302Piezoelectric polymer hydrophone
A piezoelectric polymer hydrophone including a single flexible sheet of a ezoelectric polymer having a plurality of electrode strips on the top and bottom of the sheet. The electrode strips at the top are staggered by one half the width of a strip relativ...
03/08/1983
4375042Temperature gradient method of nonuniformly poling a body of polymeric piezoelectric material and novel flexure elements produced thereby
A body of polymeric piezoelectric material is nonuniformly poled by establishing a temperature gradient greater than about 10° C. and less than about 100° C. across the thickness of the body and applying an electric field across the thickness of the bod...
02/22/1983
4370182Method of making tape transducer
A method of continuously making a composite tape transducer consisting of the steps of electrically charging dielectric layers on opposite sides of a conductive inner strip to form electrets, applying wider outer laminates symmetrically to opposite sides ...
01/25/1983
4370663Thin body ink drop generator
A continuous liquid drop generator and a printing system employing it are disclosed. The generator includes a thin cavity which contains liquid under pressure. The liquid is emitted through a nozzle as a liquid column from which drops are formed. The liqu...
01/25/1983
                9      
 
Sign InRegister
Username  
Password   
forgot password?