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Electret Manufacture Patents
ELECTRET MATERIAL BASED ON POLYETHYLENE AND METHOD OF ITS MANUFACTURE
RU2648360
...: in the electret material, composed of a polyethylene film with a discrete layer of phosphorous oxide structure, synthesized on its surface, chemically related to polymeric matrix, the second discrete layer is synthesized, which consists of titanium oxide structures, chemically linked to the phosphorous oxide structures. The production method of electret material based on polyethylene involves the synthesis of phosphorous oxide structures on the surface of polyethylene film by sequential processing of the film with vapours of phosphorus trichloride, dried gas-carrier. After the synthesis of phosphorous oxide structures the synthesis of titanium tetrachloride structures is done by sequential processing of the film with titanium tetrachloride vapours, dried gas-carrier, water vapours and newly-dried gas-carrier with the subsequent corona electrising.EFFECT: invention makes it possible to increase the value and thermostability of the surface density of the electret charge in polyethylene films.
Magnetostrictor and electret based magnetoelectric converter
CN106291408
The invention discloses a magnetostrictor and electret based magnetoelectric converter. The present invention comprises an electret, a magnetostrictor and a metal pole plate. The electret is arranged at one end of the magnetostrictor. The other end of the magnetostrictor is relatively fixed. A metal film is electroplated between the electret and the magnetostrictor. The metal pole plate is arranged at a position opposite to the electret. The metal pole plate and the electret form a capacitor. Both the metal film and the metal pole plate are provided with guiding wires that reach a signal processing unit. Simple in structure and low cost to manufacture, the converter is designed with a small size, allowing it to be portably carried around. The converter can be used to detect direct current and alternate current magnetic fields as well as to detect metal.
ELECTRET MANUFACTURING METHOD AND POROUS ELECTRET MANUFACTURING APPARATUS
JP2010010462
PROBLEM TO BE SOLVED: To easily manufacture a porous high-voltage electret. ;SOLUTION: A die plate 200 is a ceramic plate where a plurality of holes 210 are regularly located, and a punch plate 100 is also a ceramic plate having a plurality of punches 110 to be fit with the holes of the die plate 200. To open holes in an electrode 20 and an electret 40 by means of the punch plate 100 and the die plate 200, the electrode 20 and the electret 40 which are integrally formed are placed on the die plate 200. Then, when the punch plate 100 is pressed against the electret 40, portions through which the punches 110 have passed in the electrode 20 and the electrets 40 are punched out and the punches 110 penetrating through the electret 40 and the electrode 20 are fit with the holes 210 of the die plate 200 so that holes 2 are opened in the electrode 20 and the electret 40.
Base-electrode-free electret static linear generator and manufacture method for the electret
CN105978395
The invention discloses a base-electrode-free electret static linear generator and a manufacture method for the electrets. The base-electrode-free electret static linear generator comprises a pedestal, a first stator, a second stator, a rotor and a limiting mechanism; the first stator and the second stator are fixed on the pedestal in parallel; the stator is positioned in the middle of the first stator and the second stator; the surfaces of sides of the first stator and the second stator which face the rotor are provided with working electrodes or electrets; two side surfaces of the rotor are correspondingly provided with the electrets or the working electrodes; the electret has no the base electrode; the rotor performs linear movement in a plane parallel to the first stator and the second stator under driving of an external force; and relative movement between the working electrodes and the electrets enables inductive charges generated on the working electrode to be transferred and outputted through a load. The base-electrode-free electret static linear generator and the manufacture method for the electrets use the electrets having no a substrate electrodes in the static linear generator, and enable the charges carried by the electrets to be used for inducing the inductive charges of the corresponding working electrode so as to greatly improve charge conversion efficiency of the generator.
PAPER-BASE FLEXIBLE POWER-GENERATION APPARATUS, AND MANUFACTURING METHOD THEREOF
US9755553
A paper-base flexible power-generation apparatus, and a manufacturing method thereof. The flexible power-generation apparatus comprises: a first assembly (1) formed by a paper-base insulation layer (11) and a first metal conductive layer (12) deposited on the surface of the paper-base insulation layer, and a second assembly (2) formed by a paper-base insulation layer (21), a second metal conductive layer (22) deposited on the surface of the paper-base insulation layer, and an electret material layer (23) coating on the surface of the second metal conductive layer. The two edges of the two assemblies are each provided with an electrode (13, 24) and the electrodes are connected through a packaging process. The first metal conductive layer is opposite to and spaced from the electret material layer. The flexible power-generation apparatus has a low cost, is easy to manufacture, has high output power, and is especially suitable for being integrated with other flexible electronic devices.
ELECTROSTATIC TRANSFORMER
JP2014230398
To solve the problem that, when an electrostatic transformer is manufactured on the assumption of an interdigital electrostatic actuator which is manufactured by a MEMS technique, a manufacturing process becomes complicated and also it is difficult to manufacture an electrostatic transformer having large output at a low cost.SOLUTION: An electrostatic transformer is manufactured by combining two sets of electrostatic actuators formed of parallel plate capacitors on upper and lower two stages. The first electrostatic actuator (input-side electrostatic actuator) is formed of an input-side fixed electrode 2 and a movable electrode 6 including an electret 8 on an electrode surface. The second electrostatic actuator (output-side electrostatic actuator) is formed of an output-side fixed electrode 2 and a movable electrode 6 including an electret 10 on an electrode surface. A transformation ratio of the electrostatic transformer is a ratio of an electromechanical coupling coefficient of the input-side electrostatic actuator to an electromechanical coupling coefficient of the output-side electrostatic actuator.
Tourmaline electret polylactic acid melt-blown non-woven cloth and manufacture method
CN103061038
The invention relates to tourmaline electret polylactic acid melt-blown non-woven cloth and a manufacture method. The tourmaline electret polylactic acid melt-blown non-woven cloth is manufactured through tourmaline modified polylactic acid melt-blown ultrafine fibers, wherein the diameter of the fiber ranges from 1 mu m to 10 mu m, and the tourmaline modified polylactic acid melt-blown ultrafine fiber is made of polylactic acid, tourmaline and assistant. The mass of the tourmaline is 1-3% of the mass of the polylactic acid, the assistant comprises coupling agent, dispersing agent and diluent, the mass of the coupling agent occupies 2-3% of that of the tourmaline, the mass of the dispersing agent occupies 1-3% of the mass of the tourmaline, and the mass of the diluent is three times as that of the coupling agent. The tourmaline electret polylactic acid melt-blown non-woven cloth is good in filtering effect, non-toxic, harmless and environment-friendly.
PROCESS FOR PRODUCING ELECTRET COARSE POWDER
KR20110095087
PURPOSE: A process for producing electret coarse powder is provided to efficiently manufacture uniformly electret coarse powder in a desired size and to enable easy pulverization of a fluorine-containing resin sheet through the irradiation of electronic beams or radiation. CONSTITUTION: A process for producing electret coarse powder comprises a step of forming an electret sheet by irradiating electronic beams or radiation to a fluorine-containing resin sheet and pulverizing the sheet. The fluorine-containing resin sheet is one kind or more selected from the group consisting of a tetrafluoroethylene-hexafluoropropylene copolymers sheet, a tetrafluoroethylene-perfluoroalkylvinylether copolymers sheet, and a polytetrafluoroethylene sheet.
ELECTRET, ELECTROSTATIC-INDUCTION TYPE CONVERSION ELEMENT, AND METHOD OF CHARGING ELECTRET
WO2011108721
Disclosed is: an electret wherein vanishing of electric charges can be alleviated more than with conventional ones, even though the electret is easy to manufacture with a more simple construction; and a method of charging the electret, wherein the electret can be easily charged. An electrostatic-induction type conversion element (100) is provided with: an electret (10) comprising a substrate (11) that is comprised of an insulation material, a plurality of grid connection electrodes (12), a plurality of base electrodes (13), and an insulation material layer (14); a movable section (20) that is arranged facing the electret (10); and a resistor (30) connected to the electret (10) and the movable section (20). All the base electrodes (13) of the electret (10), the ground, and a needle electrode (41) are connected together, and further, a grid (40) and the grid connection electrodes (12) of the electret (10) are also connected together. Then, a prescribed voltage is applied between the needle electrode (41) and the base electrodes (13), charging the insulation material layer (14).
METHOD OF MANUFACTURING OSCILLATING POWER GENERATING ELEMENT, AND POWER GENERATION ELEMENT
JP2011024278
To manufacture an oscillating power generating element which has substantially the same power generation performance as conventional power generating elements and does not use high-cost manufacturing processes. ;SOLUTION: First, an oscillating part 201 is formed by forming an electrode 102, which includes an electret material on one main surface of an Si substrate 101 with which SiO<SB>2</SB>created at the surface (S101). A spring material layer 104 is formed via a peeling layer 901 to a support board 900 through application (S102). Here, a photosensitive material is used for the spring material layer 104. A frame part 141, a central island 142, and a spring part 143 are integrally formed from the spring material layer 104 by photolithography and selective etching (S103). An oscillating section 201 is bonded to the central island 142 by an adhesive or the like (S104). An oscillating layer 11 is formed by peeling off the supporting board 900 (S105). A base layer 16 is formed (S106) and an electrode 102 is charged with a charge (S107), and then the oscillating layer 11 and the base layer 16 are stuck together at a specified interval
SiO2 electret and its manufacturing process.
EP0608162
In order to manufacture a SiO2 electret, SiO2 (10) is deposited on a solid substrate (5) by vapour phase deposition from a suitable plasma, and the deposit thus produced is heat-treated by heating to a temperature of greater than 100@C for a length of time greater than 1 hour, and the deposit thus treated is finally charged electrically.
Method for manufacturing electret vibrating membrane
CN101729971
The invention provides a method for manufacturing electret vibrating membranes, which comprises the following steps: firstly, attaching a dielectric membrane to a frame through a binding material, and attaching a fixed part to the edge on the upper surface of the dielectric membrane and the frame; secondly, carrying out the metal sputtering on the dielectric membrane to form a conducting material layer; and finally, carrying out the polarization treatment on the dielectric membrane so as to manufacture the electret vibrating membrane.
Electromechanical converter, method for manufacture and use of same
US2013307370
The converter has a dielectric elastomer layer (1) whose sides contact two electret layers (4, 5). The electret layers carry opposite electrical charges and contact two electrodes (2, 3). One electrode is arranged on one of the sides of the elastomer layer that lies opposite to the other electrode. The electret layers are made of polymer, and material of the elastomer layer exhibits dielectric constant that is greater than or equal to 2. The latter electrode is made of metals, metal alloys, conductive polymers, oligomers, conductive oxides, conductive fillers or filled polymers. Independent claims are also included for the following: (1) a method for producing an electromechanical converter (2) a method for producing electricity.
METHOD FOR THE PRODUCTION OF AN ELECTRET SHEET
US5110620
An electret sheet comprises a porous sheet made of a dielectric polymer and at least one solid material selected from the group consisting of organic materials, inorganic materials, and metallic materials, the porous sheet having the material spaced at various intervals and a method for the manufacture of the said electret sheet.
Method and apparatus for making a nonwoven fibrous electret web from free-fiber and polar liquid
US6375886
A method and apparatus for charging fibers that contain a nonconductive polymer. A polar liquid 32, 34 is sprayed onto free-fibers 24, and the free-fibers 24 are then collected to form an entangled nonwoven fibrous web 25 that may contain a portion of the polar liquid. The nonwoven web 25 is then dried 38. By applying an effective amount of polar liquid 32, 34 onto the nonconductive free-fibers 24 before forming the nonwoven web 25, followed by drying 38, the individual fibers 24 become charged. The method and apparatus enable the fibers 24 to be charged during web manufacture without subsequent processing.
Phyllosilicate electrets and a method for their manufacture
US4808849
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 thereto. The electret is manufactured by either removing external ions from or adding external ions to a surface thereof. In a preferred embodiment, the electret is fabricated by placing the material between a pair of electrodes and immersing the material and electrodes in high-voltage insulating medium. A dc potential is then applied across the electrodes to create an electric field across the material. The duration of application of the dc potential is sufficient to provide a large surface charge on the material. The material is then separated from the electrodes while it is still immersed in the insulating medium. The separated material is then removed from the medium to obtain a substantially permanently charged electret.
EARTHQUAKE PREDICTER
CN2110234
The utility model relates to an earthquake predictor, which comprises a sensor, a signal processing circuit, an audio oscillating circuit, and a power amplification circuit. The sensor is an air-proof housing, and the housing is provided with a sensor circuit board and an electret's microphone. The output signal of the sensor circuit is sent into the input terminal of the signal processing circuit by a shield cable. The device causes the circuit to work according to an earthquake sound signal before an earthquake, and consequently, the device obtains the purpose of alarming before the earthquake. The utility model has the advantages of artful structure, convenient operation, low cost, simple manufacture and easy popularization, and is an earthquake predictor which is used for units.
THREE KINDS OF HIGH POLYMER MICROPORE MEMBRANES OF ELECTRET AND PROCESS OF MANUFACTURE OF THEM
CN85100859
The invention provides three kinds of high polymer micropore membranes of electret. They are micropore membrane made of polytetrafuuoroethylene, super fine cellulose membrane made of polypropylene and micnopore membrane made of nitrocellulose. Electrostatic field of the micropore membranes is rather high and can be maintained longly. It is fixed to electret by line corona or point corona, the field strength necessary to fix membrane to electret is -2000 volts/cm-15000 volts/cm or -2000 volts/cm -12000 volts/cm respectively. The membranes can crue six kinds of diseases respectively, treatment efficiency is up to 90%. Its cost is cheap. It is convenient to use it, it can be used for filter of gas rising filter efficiency and richening oxigen.
ELECTRETS AND THE MANUFACTURE THEREOF
CA1217577
A method for producing stable, layered electrets includes the steps of placing a thin sheet of glassy polymer or copolymer of high molecular weight, such as polyethylene terephthalate, between two, somewhat larger in plan form, sheets of polyvinyl chloride and/or polyvinyl acetate formulation, to form a sandwich structure which is then compressed and heated to approximately 300.degree.F. At this temperature the exterior polyvinyl chloride or copolymer sheets are polarized and displaced under pressure over the interior sheet to charge the interfaces of the exterior and interior sheets. The heat, furthermore, bonds the peripheral edges of the larger exterior sheets to each other thus forming a hermetically closed container within which the charged interfaces will reside. Alternatively, two or more sheets of electret (polymer) material may be pressed and heated against each other to a point where plastic deformation occurs but below melting. At this point surface charges on each sheet induce internal charges or polarization which is then fixed by rapid cooling.
METHOD FOR FORMING ELECTRET AND MEMS DEVICE
JP2016209935
PROBLEM TO BE SOLVED: To make it possible to uniformly manufacture an electret having a desired charge amount.SOLUTION: In the state that a conductive heater 5 is brought into contact with a pedestal part 21 of a vibration power generation element substrate 20 via a SiOlayer 2, the conductive heater 5 is electrically conducted, whereby the pedestal part 21, a movable comb-like electrode 22, and a stationery comb-like electrode 23 are heated, and at the same time, a bias voltage VB is applied between the movable comb-like electrode 22 and the stationery comb-like electrode 23 thereby generating polarization in the SiOlayer 2. Thereafter, in the state that the SiOlayer 2 is polarized, electric conduction of the conductive heater 5 is stopped so as to cool the pedestal part 21, the movable comb-like electrode 22, and the stationery comb-like electrode 23, whereby polarization of the SiOlayer 2 is immobilized.
METHOD TO MANUFACTURE ELECTRET ITEMS BASED ON USING ZETA-POTENTIAL
RU2011121015
FIELD: electricity.SUBSTANCE: invention relates to the method for making a fibrous electret item from a polymer material, having a zeta-potential, which is higher or lower than - 7.5 mV. The item is charged by bringing it in contact with a water-based liquid having the following pH and conductivity values: (i) if an item has a zeta-potential of -7.5 mV or below, then liquid brought in contact with it has pH of more than 7 and conductivity from 5 to 9000 mcS/cm. If an item has a zeta-potential of more than -7.5 mV, then liquid brought in contact with it has pH of 7 and below and conductivity from 5 to 5500 mcS/cm.EFFECT: electret item may have improved characteristics, especially if it is used as an electret filtering item.
IMPROVED ELECTRET MANUFACTURE
WO2014019927
An electret is manufactured by providing a dielectric material to be configured in at least first and second coalescable portions, applying charge on the first of the portions to produce a spatial pattern, and coalescing the second of the portions on the first portion such as to trap the charge between and within the first and second portions in said spatial pattern e.g. by partial melting or gluing.
ELECTRET COMPONENT AND POWER GENERATOR
JP2019207244
To provide an electret component that has high precision in manufacture, can be made light, and cannot be destroyed easily even if external shock is applied and shows high strength, and to provide a power generator using the electret component.SOLUTION: A power generator using an electret component 340 is provided with a plurality of charge bodies 342 on a surface of a base material formed with a first material (silicon) as a main constituent, and comprises, in positions other than a part in which the charge bodies 342 on the surface of the base material, an interlayer made of metal and a shock absorbing film that is laminated on the interlayer and has a second material (resin) having higher viscosity and toughness than the first material as a main constituent. An opening 343 is provided among the plurality of charge bodies 342 of the base material. The base material is in a disk shape, has a shaft hole 351 to which a shaft is fitted, and has an interlayer and a shock absorbing film also on an inner peripheral surface of the shaft hole 351
Dielectric having nanoring structure carbon nanotube and Energy harvesting device using the same
KR20190053450
The present invention relates to a method for manufacturing a dielectric composite including a nanoring-structured carbon nanotube, which disperses nanoring-structured carbon nanotubes with excellent dispersibility and conductivity in a dielectric with an excellent strain rate to manufacture a dielectric composite with high capacitance and a high strain rate, and applies the dielectric composite to an energy harvesting device, thereby increasing an electric energy generation efficiency; and an energy harvesting device using the dielectric composite including a nanoring-structured carbon nanotube. According to the present invention, the energy harvesting device using a dielectric composite including a nanoring-structured carbon nanotube comprises: an electret; the dielectric composite spaced apart from the electret and including a nanoring-structured carbon nanotube; and a deformation frame disposed close to the dielectric composite. When the deformation frame is extended in a horizontal direction, the dielectric composite is also extended and a distance between the electret and the dielectric composite is decreased. When the deformation frame is returned to an original state, the dielectric composite is restored to an initial state and the distance between the electret and the dielectric composite is restored to an initial state.
METHOD AND DEVICE FOR MANUFACTURING ELECTRET
JP2010267884
PROBLEM TO BE SOLVED: To provide a method and a device for manufacturing an electret that can shorten a time needed to manufacture the electret. SOLUTION: The device 100 for manufacturing the electret includes: an upper chamber 101 into which a helium gas is injected; a lower chamber 102 in which an argon gas is added to air; a pedestal 104 for holding a silicon microphone 110; electrodes 105 and 106 provided to the pedestal 104; a DC power source 107 for applying a DC voltage between the electrodes 105 and 106; and an ionizing radiation generating device 108 for generating an ionizing radiation. The device 100 is configured to generate positive ions and negative ions by the ionizing radiation to electrostatically charge a silicon oxide film 132 provided to a back plate 130 to the negative polarity with the negative ions in a state wherein the DC voltage is applied to counter electrodes of the silicon microphone 110 in an atmosphere wherein the argon gas is added to the air.
Devices for manufacturing electrets, and electrets obtained thereby
US5565717
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 dielectric (1) to be charged, means for generating ions (3) in the vicinity of the dielectric, a grid (4) extending parallel to the surface to be charged of the dielectric, at a small distance from said face, and raised to an electric potential different from ground potential and a conductive frame (7) that is insulated from the electrode and that is electrically connected to the grid, said frame surrounding the dielectric and forming a single block with the electrode.
METHOD FOR ELECTRET PRODUCTION BY VAPOR CONDENSATION
RU2260866
ELECTRET MANUFACTURING PROCESS
RU94038629
DEVICE TO MANUFACTURE ELECTRET
RU2037225
AN ORGANIC FERROELECTRIC OR ELECTRET DEVICE
WO2006009462
Continuous electret filter medium manufacture - uses a substantially closed supporting dielectric foil
NL8300439 // L8300437
METHOD FOR MANUFACTURE OF FIBROUS ELECTRET WEB
RU2247182
ELECTRET FIBROUS FILTER MATERIAL AND METHOD OF MANUFACTURE THEREOF
RU2189850
METHOD OF ELECTRIZATION OF NONWOVEN CLOTH, ELECTRET FILTER MEDIUM
RU2130521
METHOD FOR MANUFACTURE OF ELECTRET FILTER
RU2056950
Method for the manufacture of the electret filtering unwoven fabric
PL380025
Electret unwoven filter cloth...
PL380023
Method for the manufacture of electret pneumothermal unwoven fabric...
PL378771
ELECTRET FILTER ELEMENT AND METHOD FOR THE PRODUCTION THEREOF
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METHOD OF MANUFACTURE OF ELECTRET MEMBRANES FOR ELECTROACOUSTIC TRANSDUCERS
PL234822 // PL209457
UNILATERALLY METALLIZED ELECTRET FOIL
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Dielectric cellular electret film and procedure for its manufacture
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Electrically conducting thermoplastic material..
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PROCESS OF MANUFACTURE OF ELECTRET ELEMENT
RU1788601
METHOD AND A DEVICE FOR MANUFACTURE OF A FIBROUS ELECTRET LINEN
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METHOD AND APPARATUS FOR MAKING ELECTRET
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ELECTRET MICROPHONE
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ELECTRET MICROPHONE ASSEMBLY, AND METHOD OF MANUFACTURE
WO9318627
AN ELECTRET CONDENSER MICROPHONE...
KR20020045978
ELECTRET CONDENSER MICROPHONE, AND MANUFACTURING METHOD THEREOF
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METHOD OF MANUFACTURING ELECTRET CONDENSER MICROPHONE UNIT
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METHOD OF MANUFACTURING THERMAL RESISTANT CHARGED RESIN, AND ELECTRET CONDENSER MICROPHONE
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ELECTRET CONDENSER MICROPHONE
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METHOD OF MANUFACTURING ELECTRET FILM FOR ELECTROSTATIC ACTUATOR
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VIBRATION PICKUP DEVICE AND ITS MANUFACTURE
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MANUFACTURE OF ELECTRET SHEET
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SEMICONDUCTOR DEVICE, SEMICONDUCTOR ELECTRET CAPACITOR MICROPHONE
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INTEGRATED CAPACITIVE TRANSDUCER AND ITS MANUFACTURE
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ELECTRET AND ITS MANUFACTURE
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MANUFACTURE OF SEMICONDUCTOR ELECTRET CONDENSER MICROPHONE AND THE SEMICONDUCTOR ELECTRET CONDENSER MICROPHONE
JP2001069596
MANUFACTURE OF ELECTRET FILTER
JPH04358510
MESH ELECTRET AND ITS MANUFACTURE
JPH0647218
ELECTRET DEVICE AND ITS MANUFACTURE
JPS59101998
MANUFACTURE OF HEAT RESISTANCE ELECTRET CONDENSER MICROPHONE
JP2000032596
MANUFACTURE OF ELECTRET FILM
JPH0487313
MANUFACTURE OF LAMINATED BOARD FOR ELECTRET
JPS6444010
ACOUSTIC SENSOR, ITS MANUFACTURE AND SEMICONDUCTOR ELECTRET CAPACITOR MICROPHONE EMPLOYING THE ACOUSTIC SENSOR
JP2000013894
MANUFACTURE OF ELECTRET FABRICS
JPS6252918
MANUFACTURE OF HIGH MOLECULAR PIEZOELECTRIC OR PYROELECTRIC MATERIAL
JPS6060789
MANUFACTURE OF COMPOSITE MATERIAL FOR ELECTRET
JPH0613262
ELECTRET FIBER AND ITS MANUFACTURE
JPS6146215
MANUFACTURE OF ELECTRET
JPS63316421
MANUFACTURE OF ELECTRET CONDENCER MICROPHONE
JPS6128300
MANUFACTURE OF ANTISTATIC ELECTRET SHEET
JPS627110
MANUFACTURE OF ELECTRODE PLATE ELECTRET OF STATIC TYPE ELECTROOACOUSTIC CONVERTER
JPS5549099
MANUFACTURE OF ELECTRODE PLATE ELECTRET OF STATIC TYPE ELECTROOACOUSTIC CONVERTER
JPS5549098
ELECTRET FIBER SHEETLIKE MATERIAL AND MANUFACTURE THEREOF
JPS63287012
MANUFACTURE OF ELECTRET CONDENSER MICROPHONE DIAPHRAGM
JPH01289400
MANUFACTURE OR PIEZO-ELECTRIC POLYMER FILM
JPH0191412
MANUFACTURE FOR ELECTRET MICHROPHONE
JPS5544207
LAMINATED PLATE FOR ELECTRET AND ITS MANUFACTURE
JPH07320981
MANUFACTURE OF ELECTRET FILTER
JPH04330907
MANUFACTURE OF ELECTRET AND ELECTRET FILTER
JPH04330707
ELECTRET MATERIAL AND ITS MANUFACTURE
JPH02271607
DEODORIZING ELECTRET FILTER AND MANUFACTURE THEREOF
JP2000279505
MANUFACTURE OF SHEET FORMED INTO ELECTRET AND MANUFACTURING DEVICE FOR SAME
JPH02263420
CAPACITOR MICROPHONE
JPS55166400
MANUFACTURE OF POLYMERIC ELECTRET
JP2000269080
ELECTRET APPLIED DEVICE AND MANUFACTURE THEREOF
JPH09257833
ELECTRET APPLIED DEVICE AND MANUFACTURE THEREOF
JPH09257832
MANUFACTURE OF HIGH MOLECULAR PIEZOELECTRIC FILM AND DEVICE THEREOF
JPS58186984
MANUFACTURE OF POLYMER PIEZOELECTRIC MATERIAL
JPS59188984
MANUFACTURE FOR ELECTRET ELECTROSTATIC TYPE ELECTROACOUSTIC CONVERTER
JPS56158599
MANUFACTURE OF THIN AMORPHOUS SILICON FILM
JPS57173935
SEMICONDUCTOR DEVICE AND MANUFACTURE THEREOF
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ELECTROACOUSTIC TRANSDUCER
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TRANSPARENT POLYMER PIEZOELECTRIC ELEMENT AND MANUFACTURE THEREOF
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ELECTRET DEVICE
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ELECTRET FILTER AND MANUFACTURE THEREOF
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MANUFACTURE OF FUNCTIONAL ELECTRET MATERIAL
JPH0119140 // 1187918
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GB2060259
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GB2011760
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Home system for altitude and frequency customised one-way logical communications using cylindrical ultrasonic transducers
FR2586875
Method to manufacture an electret.
ES413015
Process and apparatus for the manufacture of electret filaments, fibres or the like.
EP0090062
Piezo-electric film manufacture and transducer.
EP0014043
Electret transducer and method of making an electret transducer.
EP0002363
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Electret fibres with improved charge stability, manufacture thereof, and textile material containing same
DE4321289
Micro-vibration sensor
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ELECTRET MICROPHONE OF MAGNETO-TELEPHONE SET
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ACOUSTIC ELECTRICAL CONVERSION DEVICE...
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Novel electret microphone
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Single directive electret microphone structure
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SENSOR AND METHOD OF MANUFACTURE THEREOF
WO2017021734
Production process of electrostatic fiber hot-rolled non-woven fabric filtering medium
CN107090662
Biocompatible space-charged electret materials with antibacterial and antiviral effects and methods of manufacture thereof
TW202406459 // O2023158923 // US2023097006
MICROPHONE CAPSULE, MICROPHONE ASSEMBLY
CN113228699
METHOD FOR MANUFACTURING ELECTRET MATERIAL BASED ON FLUOROPOLYMER
RU2748032
Electret condenser microphone with selectable sensitivity
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Electret capacitor microphone with relatively small noise factor...
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Novel MEMS microphone and manufacture method thereof
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Electret microphone
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Simple three-piece diaphragm-type electret capacitor microphone
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Midget microphone and manufacturing method thereof
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Electret capacitance microphone
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