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| Number | Title | Issue Date |
| 7287328 | Methods for distributed electrode injection Methods for injecting charge include providing a target comprising a first layer on a second layer, coupling a conductive base to the second layer, and providing a medium which is in contact with at least a portion of the first layer. An electrode is positioned to f... | 10/30/2007 |
| 7287327 | Electret capacitor microphone and method for producing the same A method for producing an electret capacitor microphone high in sensitivity and stable in acoustic characteristic. A PET film stretched with predetermined tension is bonded to a diaphragm support ring to perform stretch and fixation of a diaphragm to produce a diaph... | 10/30/2007 |
| 7254212 | Particulate matter analyzer, collecting filter and system for analyzing and collecting samples from fluids A system, including a particulate matter analyzer and collecting filter, provides a method of analyzing and collecting samples from fluids, such as collecting particulate matter from air. A mass measuring unit and composition analyzing unit can be provided for eithe... | 08/07/2007 |
| 7215404 | Liquid crystal display device free from cross talk and fabrication method thereof A liquid crystal display device free from cross talk is disclosed. The device has a supporting column, a contact part and an electrically conductive layer. The supporting column is provided for an upper substrate and vertically extended therefrom to maintain a unifo... | 05/08/2007 |
| 7094270 | Composite filter and method of making the same The invention refers to a composite filter for filtering a stream of ambient air including at least one non-prebonded upstream tier and one non-prebonded downstream tier, wherein the ratio of absolute pore volume of upstream tier to downstream tier RAPV>2, and the a... | 08/22/2006 |
| 7027122 | Bonding apparatus having compensating system for liquid crystal display device and method for manufacturing the same An apparatus for manufacturing a liquid crystal display device includes a vacuum processing chamber having a substrate entrance, an upper stage and a lower stage provided at an interior of the vacuum processing chamber, and a compensation system positioned within th... | 04/11/2006 |
| 6841917 | Electrostatic levitation and attraction systems and methods An electrostatic interaction system includes a first structure having a first fixed electrostatic charge and a second structure having a second fixed electrostatic charge. The polarity of the first and second fixed electrostatic charges determines a positional relat... | 01/11/2005 |
| 6818092 | Multi-layer electret having ultra-high charge stability and method of manufacturing thereof A multi-layer electret that can endure a high temperature so as to be processed by surface mount technology (SMT) and has ultra-high charge stability and a method of manufacturing thereof are provided. The multi-layer electret is constructed in such a manner that an... | 11/16/2004 |
| 6806593 | Thin film electret microphone An electret formed by micro-machining technology on a support surface, including a self-powered electret sound transducer, preferably in the form of a microphone, formed by micro-machining technology. Each microphone is manufactured as a two-piece unit, comprising a... | 10/19/2004 |
| 6717488 | Resonator with a member having an embedded charge and a method of making thereof A resonator includes a member with an embedded charge, at least one input electrode, at least one output electrode, and at least one common electrode. The input and output electrodes are spaced from and on substantially opposing sides of the member from the common e... | 04/06/2004 |
| 6621191 | Structure containing organic molecular layer and use thereof A novel structure comprising two substrates disposed closely each other, in which an organic molecular layer is formed on the surface of at least one substrate wherein the gap between the surface of the organic molecular layer on one substrate and the sur... | 09/16/2003 |
| 6489033 | Electrets Electrets can be produced from cycloolefin copolymers (COCs), and charges applied thereto are stable for long periods, even at high temperatures and high relative humidities. The reduction here in a positive charge applied to the COCs is smaller than that... | 12/03/2002 |
| 6308398 | Method of manufacturing a wafer fabricated electroacoustic transducer A method is disclosed for simultaneously producing a plurality of capacitive electroacoustic transducers. The method comprises forming a plurality of electrically insulative substrates by cutting circular slots to an insulating wafer. Each slot is interru... | 10/30/2001 |
| 5757090 | Folded dielectric film element and method for maufacturing the same A folded dielectric film element is provided which converts energy. The film element includes at least one dielectric film that is bent into folds and provided with electrodes. The electrodes are arranged in the folds so that different electrodes are plac... | 05/26/1998 |
| 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 dielectric (1) to be charged, means for generating ions (3... | 10/15/1996 |
| 5491879 | Procedure to polarize at least one zone of a foil of ferroelectric material to produce a polarized element for piezoelectric or pyroelectric transducers A method of polarizing selected areas of a foil of ferroelectric material, wherein electrodes are deposited in such a way on the opposite surfaces of the foil that the zone to be polarized extends between these two electrodes. The zone to be polarized is ... | 02/20/1996 |
| 5284692 | Electrostatic evacuated insulating sheet An electrostatic evacuated insulating sheet comprises two permanently charged electret repulsion layers (18 and 28) laminated to two respective insulating layers (16 and 26), which are in turn laminated to two impermeable metallic compensation layers (14 ... | 02/08/1994 |
| 5255428 | Electrooptic polymer voltage sensor and method of manufacture thereof An optical voltage sensor utilizing an electrooptic polymer is disclosed for application to electric power distribution systems. The sensor, which can be manufactured at low cost in accordance with a disclosed method, measures voltages across a greater ra... | 10/26/1993 |
| 5112677 | Electret sheet and a method for the production of the same 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 va... | 05/12/1992 |
| 5101543 | Method of making a variable capacitor microphone A method of making a variable capacitor microphone in which the fixed capacitor element is formed by first coating the metallized surface of a relatively rigid insulating substrate with a polarizable dielectric material and then placing the substrate on o... | 04/07/1992 |
| 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 thereto. The electret is manufactured by either removing external... | 02/28/1989 |
| 4764690 | Electret transducing A backplate assembly for an electret transducer including a backplate, an electret layer covering one surface of the backplate, and a peripheral spacer on the same side of the backplate as the electret layer and around the entire periphery of the electret... | 08/16/1988 |
| 4701640 | Electret transducer and method of fabrication An electret transducer is comprised of a motor and signal processing apparatus, that may include an amplifier and/or impedance matching means, disposed within a sealed conductive housing. The motor is fabricated in place within a housing and the signal pr... | 10/20/1987 |
| 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 electrically polarizable body. Large-scale breakdown effects in the... | 09/16/1986 |
| 4608109 | Method of manufacturing high potential electrets 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 planform, sheets of polyvinyl chloride... | 08/26/1986 |
| 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 continuously feeding a web of dielectric material with a subs... | 05/13/1986 |
| 4571464 | Electret microphone An electret microphone comprising a rectangular metal electrode, a metallized electret film and an amplifier element encapsulated in a lower and an upper casing half. A contact element comprises a flat web portion and two prongs which are provided with tu... | 02/18/1986 |
| 4567382 | Electret transducer and a method for manufacturing an assembly of backplate, electret foil and diaphragm plate An electret transducer and a method for making same. A multiple support between a diaphragm plate and a backplate is provided by a plurality of relatively small spacing disks made of an electrically insulating material and which as separate posts are fixe... | 01/28/1986 |
| 4542264 | Lead-frame for an electric microphone A lead frame for an electric microphone which includes an H-shaped structure of thin metallic material including spaced parallel legs and a crossbar therebetween. A first plate is spaced from the crossbar and is located between the legs. A lead connects t... | 09/17/1985 |
| 4527218 | Stable positively charged Teflon electrets A method of producing charged Teflon material having a stable internal positive charge is shown. Partially penetrating positive ions, which may be produced, for example, by a corona discharge or ion beam, are applied to Teflon at an elevated temperature, ... | 07/02/1985 |
| 4473863 | Apparatus for and method of making an electret tape Apparatus for making an electret tape having an electrically conductive strip with a dielectric layer on one side thereof comprises tape supply and take-up reels arranged to move the tape from the former to the latter in an upwardly inclined plane and an ... | 09/25/1984 |
| 4442324 | Encapsulated backplate for electret transducers Electrically conductive sheets comprising backplates for electret transducers are substantially encapsulated with hydrophobic electrically insulating coatings. The coatings are melt bonded to both faces of the sheets and to the edges of the sheet peripher... | 04/10/1984 |
| 4440591 | Method of manufacturing high potential electrets A method for producing stable, layered electrets includes the steps of placing a sheet of glassy polymer or copolymer of high molecular weight, such as polyethylene terephthalate, between two, somewhat larger in planform, sheets of polyvinyl chloride and/... | 04/03/1984 |
| 4434327 | Electret transducer with variable actual air gap An electret transducer for producing a directional response, electret foil (92) and a backplate (94) with the actual air gap thickness therebetween varying in accordance with a predetermined relationship. The sensitivity of the electret transducer varies ... | 02/28/1984 |
| 4429189 | Electret transducer with a selectively metalized backplate An electret transducer comprises an electrostatically charged electret foil (10) superimposed directly over a selectively metalized rough surface (16) of a backplate (18). Selective metalization is realized by depositing a thin metal layer (20), the conto... | 01/31/1984 |
| 4429193 | Electret transducer with variable effective air gap A directional electret transducer comprises an electret foil and a metalized backplate the effective air gap thickness therebetween varying according to a predetermined relationship. The sensitivity of the electret transducer is directly proportional to t... | 01/31/1984 |
| 4429192 | Electret transducer with variable electret foil thickness An acoustic transducer for producing highly directional characteristics comprises a metalized backplate (130) facing the flat surface (134) of an electrostatically charged electret foil (132). The thickness of the electret foil varies along the length the... | 01/31/1984 |
| 4429191 | Electret transducer with variably charged electret foil An electret transducer for producting a highly directional response characteristic comprises a backplate (18) and, superimposed thereon, an electrostatically charged electret foil (10). The electrostatic charge varies according to a predetermined relation... | 01/31/1984 |
| 4429190 | Continuous strip electret transducer array A rough surfaced backplate has deposited thereon a metallic electrode having a plurality of large areas interconnected by thin strips. The large areas are symmetrically located on opposite sides of the center of the metallic electrode. Furthermore, the di... | 01/31/1984 |
| 4397702 | Fabrication of non-conductive charged sensing probe unit A sensing probe unit includes an electrically nonconductive polymeric layer charged with a permanent electric charge to form an electret and intimately bonded to a compensating metal electrode. In the fabrication, the polymeric layer is cleaned and the me... | 08/09/1983 |
