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7608215 |
Method of manufacturing a piezoelectric ceramic composition
There are provided steps of polarizing a ceramic composition including a perovskite compound containing Pb, Zr, Ti and Mn as main components and a heat treatment step for keeping the polarized...
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7550903 |
Method and device for polarizing a piezoelectric actuator
In a method and device for polarizing a piezoelectric actuator according to which high-frequency pulse voltages can be used for polarizing the actuators an actuator to be polarized is mounted...
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7540991 |
Ion conductive polymer electrolyte membrane and production method for the same
The present invention provides an electrolyte membrane formed of an ion conductive composition. Said composition contains a liquid crystalline polymer having an ionic dissociative group. Molecular...
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7452492 |
Method of fabricating a magnetic coder device, and the device obtained thereby
A method of fabricating a magnetic coder device, the method being of the type consisting in making a mixture of ferromagnetic particles or ferrites in a matrix, in molding the matrix, and in...
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7015254 |
Description of an inorganic polymer “electret ”in a colloidal state along with the method of generating and applications
The present invention includes an apparatus for generating an inorganic polymer electret in a colloidal state, the inorganic electret in a colloidal state itself, and applications for the inorganic...
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6783574 |
Electret filter media and filtering masks that contain electret filter media
Electret filter media comprising a nonwoven web of thermoplastic nonconductive microfibers having trapped charge, said charge provided by (1) subjecting the nonwoven web to a corona treatment,...
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6759792 |
Polarization method of a multi-layered piezoelectric body
In a polarization method of the multi-layered piezoelectric body in which a plurality of piezoelectric layers and a plurality of internal electrodes are alternately laminated and adjacent...
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6750592 |
Surface acoustic wave filter and surface acoustic wave filter apparatus
The present invention relates to a surface acoustic wave filter in which a plurality of pairs of comb electrode patterns are formed on an upper surface of a chip substrate made of a piezoelectric...
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6642341 |
Molded articles having improved flex modulus and impact strength and a process for the production thereof
Molded polyurethane articles having improved flex modulus and impact strength are produced by subjecting a polyurethane-forming reaction mixture which has been introduced into a mold to a static...
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6628042 |
Polarizing device and method
In order to polarize a piezoelectric material in high-temperature gas, a temperature-raising portion raises the temperature of the piezoelectric material to a temperature required to polarize the...
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6593681 |
Polarization apparatus and polarization method of coaxial flexible piezoelectric cable
A polarization apparatus is provided wherein a piezoelectric body tube 3 is wound around a first rotation drum 5 and a second rotation drum 6 and a coaxial flexible piezoelectric body 2 is...
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6521166 |
Method of polarization-treating piezoelectric body
A DC voltage is applied to a piezoelectric body for polarization treatment in the air and in an atmosphere with a temperature equal to or higher than an aging temperature, and then, the...
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6414089 |
Method of manufacturing polymer films having second order non-linear optical properties, polymer films, and non-linear optical element
A method of manufacturing a polymer film having second order non-linear optical properties which has excellent stability of orientated molecules and does not become disorientated, and a polymer...
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6406657 |
Method and apparatus for making a fibrous electret web using a wetting liquid and an aqueous polar liquid
A method for imparting an electrostatic charge to a nonwoven fibrous web 20 . The fibrous web 20 is wetted with a wetting liquid 24 , followed by being saturated with an aqueous polar liquid ...
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6403012 |
Method of polarization-treating piezoelectric material
In a method of polarization-treating a piezoelectric material, the maximum polarization degree Δf 180max achieved by 180° rotation is determined. A residual polarization degree Δf as a target...
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6398847 |
Method of removing contaminants from an aerosol using a new electret article
An electret is described that includes a surface modified polymeric article having surface fluorination produced by fluorinating the polymeric article.
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6387295 |
Alkali metal-containing niobate-based piezoelectric material composition and a method for producing the same
An alkali metal-containing niobate-based piezoelectric material composition comprises a solid solution represented by a composition formula (ANbO 3 ) (A: alkali metal), and at least one additive...
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6365088 |
Electret treatment of high loft and low density nonwoven webs
The process of forming an electret nonwoven web, the process including the steps of providing a nonwoven web, generating a DC corona discharge from an apparatus including an anode electrically...
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6168746 |
Injection molding of ferroelectric articles
A method for injection molding fine particulate ceramic ferroelectric materials to form an article such as ink jet printhead includes the steps of spray drying fine particulate ceramic...
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6156255 |
Electric field domain patterning
A method of patterning domains within a body of a ferroelectric material includes the application of an electric field thereto via spaced conductors. Prior to applying the electric field to the...
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6054071 |
Poled electrets for gyricon-based electric-paper displays
Twisting balls (10) for an electric-paper display are formed from a polarizable material and encapsulated in a protective shell (12). The balls (10) are disposed between first and second electrodes...
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6001299 |
Process and apparatus for manufacturing an electret article
A process for electret treatment is described, involving (1) placing the dielectric article between a combination of a first ion-repulsive electrode and a first ion-attractive electrode and between...
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5964926 |
Gas born particulate filter and method of making
Disclosed is an improved filter formed from a non-dielectric material which has been coated with a dielectric material and electret treated by, for example, DC corona discharge treatment. Also...
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5886070 |
Production method for anisotropic resin-bonded magnets
The present invention offers a production method for anisotropic resin-bonded magnets with precise dimensions in high productivity. It comprises the aligning step in which the preform is...
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5725825 |
Method of producing piezoelectric element
A method of producing a cylindrical piezoelectric element includes: (a) injecting the molding fluid containing calcined powder of piezoelectric material in a mold having cylindrical cavity and...
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5565717 |
Devices for manufacturing electrets, and electrets obtained thereby
To manufacture a thin sheet electret of small size having charge distributed in very uniform manner, even at its edges, use is made of a device comprising a grounded electrode (2) for supporting a...
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5340510 |
Method for making piezoelectric ceramic/polymer composite transducers
A net-shape process for fabricating a fully dense ceramic preform for a piezoelectric or electrostrictive composite transducer exhibiting 1-3 or 2-2 connectivity. The process involves preparing a...
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5246637 |
Method for producing electret filter
A highly efficient, reliable method is provided for producing an electret filter having an excellent collection efficiency. In this method, a film containing a resin material with high molecular...
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5230800 |
Scrim inserted electrostatic fibrous filter web
Provided is a nonwoven web of electrically charged fibers needle-punched to a scrim support. This web provides a filter medium having increased uniformity in pressure-drop, basis weight and...
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5061760 |
Vinylidene cyanide alternating copolymers exhibiting nonlinear optical and piezoelectric properties
In one embodiment this invention provides vinylidene cyanide copolymers with alternating monomeric units as illustrated by the following structure: ##STR1## An invention vinylidene cyanide...
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5057588 |
Vinylidene cyanide alternating copolymers
In one embodiment this invention provides vinylidene copolymers with alternating monomeric units as illustrated by the following structure: ##STR1## An invention vinylidene copolymer in the form of...
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5051159 |
Non-woven fiber sheet and process and apparatus for its production
A process apparatus for producing a non-woven, especially a non-woven electret, fiber sheet provides for directing the non-woven fibers at a collecting surface and into an electric field between at...
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5045528 |
Acoustic plane wave preferential orientation of metal oxide superconducting materials
A polycrystalline metal oxide such as YBa 2 Cu 3 O 7 -X (where 0<X<0.5) exhibits superconducting properties and is capable of conducting very large current densities. By aligning the...
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4874659 |
Electret fiber sheet and method of producing same
An electret fiber sheet has polarized charges on its surface and preferably has charges in ordered orientation across it. The polarized charges are present in an amount of at least 7×10 -11 C/cm...
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4808849 |
Phyllosilicate electrets and a method for their manufacture
An electret comprising an inherently charged material is provided. The material comprises phyllosilicate minerals and has external neutralizing ions removed therefrom or external ions added...
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4789504 |
Electretized material for a dust filter
An electretized material for a dust filter which is made of an insulating polymer material such as polypropylene incorporated with a fatty acid metal salt in an amount of not less than 100 ppm in...
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4612145 |
Method for producing electret-containing devices
A new method for fabricating electret-containing devices is disclosed. The inventive method includes a new technique for fabricating electrets, which involves applying a voltage across an...
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4592815 |
Method of manufacturing an electret filter
The disclosed method provides an electret filter having a permanent electrostatic charge and formed of polymer fibers having an intrinsic viscosity of 1.5 or less. Fibers of the requisite viscosity...
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4591465 |
Method of producing polymeric electret element
In producing an electret element having piezoelectric properties by subjecting a vinylidene cyanide copolymer to a polarization treatment, the copolymer is heat-treated at a temperature below the...
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4588537 |
Method for manufacturing an electret filter medium
The present invention relates to a continuous method for manufacturing an electret filter medium from dielectric material having an open or porous structure, said method comprising the steps of...
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4560737 |
Piezoelectric polymeric material
A piezoelectric polymeric material in the form of sheet or film, which comprises polymers of vinylidene fluoride (VDF) as principle components. The piezoelectric material is essentially a mixture...
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4512940 |
Method and apparatus for the production of electret material
An electret material is formed by the method which includes the step of passing a pair of electrical conductor elements along the surface of a dielectric material heated to a predetermined...
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4486365 |
Process and apparatus for the preparation of electret filaments, textile fibers and similar articles
A method for the production of electret filaments or fibers from high molecular weight substances is described which consists of melting the substances and extruding them through die orifices,...
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4375718 |
Method of making fibrous electrets
A process of manufacturing an electrostatically charged filtration medium is disclosed. A web made of nonconductive thermoplastic fibers is contacted on each side with a more conductive web to form...
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4373224 |
Method for manufacturing a duster and the duster manufactured therefrom
A method for manufacturing a duster and the duster manufactured therefrom are described, the duster head being made of strands of a blend polymer film of a mixture of isotactic polypropylene and...
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4308223 |
Method for producing electret fibers for enhancement of submicron aerosol filtration
A method is provided for imparting a permanent electrostatic charge to polymeric fibers. Ions are implanted into the fibers in the presence of a strong electric field while the temperature is...
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4291245 |
Electrets
A process for preparing polymer electrets comprising the following steps: (a) providing a parylene film having one side affixed to a metal layer and grounding said metal layer; (b) charging...
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4291244 |
Electrets
A process for preparing polymer electrets comprising the following steps: (a) providing two electrodes in a deposition zone, said electrodes being in a spaced relationship to one another, having...
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4248808 |
Technique for removing surface and volume charges from thin high polymer films
A technique for removing surface charges from thin film electret foils involves subjecting the foil to penetrating radiation of a dosage ranging from 1-25 krad and, subsequently, annealing the foil...
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4215682 |
Melt-blown fibrous electrets
A persistent electric charge is introduced into melt-blown fibers during the melt-blowing process. When these charged fibers are incorporated into fibrous webs, they provide unique properties,...
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