Zigzag Running Length Patents (Class 96/67)
  • Patent number: 10882053
    Abstract: An electronic air filter having a plurality of electrodes supported by rigid fixtures that are attached to a common case. The rigid fixtures that support the electrodes with different electrical potentials are attached to each other or to a common body in a way that increases or maximizes the creeping discharge path along the surface. Even conductive contaminants do not, therefore, provide an electrical shortage between the electrodes.
    Type: Grant
    Filed: June 13, 2017
    Date of Patent: January 5, 2021
    Assignee: Agentis Air LLC
    Inventor: Igor Krichtafovitch
  • Patent number: 10434466
    Abstract: An apparatus and a method are provided for a heating, ventilation, and air conditioning (HVAC) system air filter for a building ventilation system. The HVAC system air filter comprises a supportive frame configured to orient the HVAC system air filter within the building ventilation system. A composite filter medium retained within the supportive frame comprises a cotton gauze portion and an electrostatic portion. The cotton gauze portion is configured for treatment with a filter oil composition to enhance airflow and filtration of air flowing through the composite filter medium. The electrostatic portion is configured to electrostatically attract and agglomerate airborne molecular contaminants and volatile organic compounds (VOCs) as small as 0.001 microns in diameter. In some embodiments, the composite filter medium comprises substances configured to release a fragrance into air passing through the composite filter medium.
    Type: Grant
    Filed: December 18, 2015
    Date of Patent: October 8, 2019
    Assignee: K&N Engineering, Inc.
    Inventors: Steve Williams, Jere James Wall
  • Patent number: 10168059
    Abstract: A filtering medium includes a nonwoven fabric and a first electrode having an input terminal of power. The first electrode is provided on a surface of the nonwoven fabric. Alternatively, in a case where the nonwoven fabric has a plurality of fiber layers, the first electrode may be provided between the fiber layers. An air purifier includes the filtering medium disposed between a sucker and a discharger of a gas, and an output terminal via which power is output to the first electrode of the filtering medium.
    Type: Grant
    Filed: August 4, 2016
    Date of Patent: January 1, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Takayoshi Yamaguchi, Tadashi Maeda, Yosuke Wada
  • Patent number: 9789493
    Abstract: An ion filtration air cleaning device for cleaning air by use of electrostatic ion attraction. Air having suspended particles is drawn into the device through an inlet by a fan. An ionization source near the inlet generates ions. Electrical charge transfers from the ions to the suspended particles. The fan pushes the air and suspended charged particles toward an outlet. A filter located adjacent to the outlet operates by electrostatic attraction and filters the charged particles from the air, allowing cleansed air to be released from the device, with a reduced level of charged particle emission.
    Type: Grant
    Filed: March 14, 2012
    Date of Patent: October 17, 2017
    Assignee: Helen of Troy Limited
    Inventors: Cheri Wright, John Wilcox
  • Patent number: 9789494
    Abstract: Improvements in active field polarized media air cleaner include an aerodynamic front cowling to reduce static air resistance, a rear double hinge to reduce blow by, a resistive center screen permitting the sharing of high voltage power supplies while reducing the tendency to arc and allowing for a higher operational voltage, a dielectric media support frame to produce a more uniform electrostatic field and reduce blow by, while at the same time reducing the tendency to spray corona and/or arc at the edges of the center screen, a substantially flat conductive outer screen to produce a more uniform electrostatic field throughout the filter media and a high-voltage shield to reduce high-voltage arcing and the spraying of corona where the high-voltage probe contacts the center screen.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: October 17, 2017
    Assignee: Environmental Management Confederation, Inc.
    Inventors: Forwood C. Wiser, III, George R. Summers, Benjamin H. Kaeppner
  • Patent number: 9579663
    Abstract: An air filtration system includes a frame directing an airflow through the air filtration system and a media filter. The media filter includes a plurality of media fibers arranged to capture particles flowing therethrough and a conductive surface located at the media filter and having a conductivity within a selected range. Two or more contact pads are located at the media filter and are alignable with an electrical circuit located at the frame to determine whether a resistance across the conductive plane is within a selected resistance range. A method of installing a media filter in an air filtration system includes inserting the media filter into a frame of the air filtration system and aligning one or more contact pads of the media filter with one or more grounding pads of the frame. A resistance across the media filter is measured.
    Type: Grant
    Filed: May 14, 2012
    Date of Patent: February 28, 2017
    Assignee: CARRIER CORPORATION
    Inventor: Peter Johannes McKinney
  • Patent number: 9238230
    Abstract: The embodiments described herein improve on the present electrostatic precipitator method of using parallel plates to collect particulates by using multiple parallel vanes set at operating parameters described below. By using vanes, the main entrained air is subdivided and directed to flow between vanes that induce resistance to flow allowing charged particles to collect on the vanes. The width of the vane is designed to be wide enough so the air flow rate at the ends of the vanes is less than 1 ft/s, allowing particles discharged from the plates to fall by gravity and in the direction of very low air flow, resulting in extremely low re-entrainment and efficient particle collection. Using vanes also allows for higher operating air velocities resulting in a smaller equipment foot print.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: January 19, 2016
    Inventor: John P. Dunn
  • Patent number: 8961659
    Abstract: An electrically enhanced air filtration system is disclosed which uses rear fiber charging is disclosed. In particular, a fibrous filter may be placed in an upstream position within the system with one or more ionization arrays positioned downstream or to the rear of the fibrous filter in terms of airflow direction. The fibrous filter may include a grounded side and fiber side with the grounded side being upstream of the fiber side. The ionization array may include a plurality of electrodes each extending unidirectionally toward the fibrous filter.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: February 24, 2015
    Assignee: Carrier Corporation
    Inventor: Peter J. McKinney
  • Patent number: 8814994
    Abstract: Improvements in active field polarized media air cleaner include an aerodynamic front cowling to reduce static air resistance, a rear double hinge to reduce blow by, a resistive center screen permitting the sharing of high voltage power supplies while reducing the tendency to arc and allowing for a higher operational voltage, a dielectric media support frame to produce a more uniform electrostatic field and reduce blow by, while at the same time reducing the tendency to spray corona and/or arc at the edges of the center screen, a substantially flat conductive outer screen to produce a more uniform electrostatic field throughout the filter media and a high-voltage shield to reduce high-voltage arcing and the spraying of corona where the high-voltage probe contacts the center screen.
    Type: Grant
    Filed: December 6, 2011
    Date of Patent: August 26, 2014
    Assignee: Environmental Management Confederation, Inc.
    Inventors: Forwood C. Wiser, George R. Summers, Benjamin H. Kaeppner
  • Patent number: 8709138
    Abstract: A filter medium including a carrier layer and a microfiber layer applied thereon is characterized in that, with respect to the aim of providing a filter medium which has a relatively low pressure drop, and at the same time a good fraction separation rate and excellent dust storage capacity, the carrier layer has first fibers, which are designed as endless bicomponent fibers and spunbonded fibers, and the microfiber layer has second fibers, which are designed as endless melt-blown fibers.
    Type: Grant
    Filed: October 5, 2009
    Date of Patent: April 29, 2014
    Assignee: Carl Freudenberg KG
    Inventors: Alexandra Lazarevic, Robert Bader, Rosemarie Kurzer, Heinz Reinhardt
  • Patent number: 8623125
    Abstract: An electrode for plasma generation according to the present invention includes a plurality of collecting portions having a plurality of through holes, the plurality of collecting portions facing a gas flow in a direction where gas to be treated flows and provided spaced apart from each other. The electrode is applied to a plasma reactor of a treatment device to be provided for a device which discharges the smoke including PM, for example, an exhaust gas purifying device for automobile, or a smoke treatment device used in a facility where the smoke is discharged such as a plant.
    Type: Grant
    Filed: July 28, 2008
    Date of Patent: January 7, 2014
    Assignee: Daihatsu Motor Co., Ltd.
    Inventors: Yoonho Kim, Kazuya Naito, Takashi Ogawa, Isao Tan, Hirohisa Tanaka, Hirotoshi Fujikawa, Kazuhiko Madokoro
  • Patent number: 8409336
    Abstract: An air filter system (10) has a filter housing (11), an air filter media (12), and an electrical circuit (13) electrically coupled to the media. The filter media consists of a pleated air filter material (23) with front pleat apexes (25) and rear pleat apexes (26) which are coated with an electrically conductive material to form front vertical strips (27) and rear strips (28). The electrical circuit includes a positive front electrical contact (30) and a rear electrical contact (31). The front electrical contact has a rear surface (30?) in electrical contact with an elongated front electrical contact bar (33), oriented horizontally across and in electrical contact with the filter front strips of conductive ink. Similarly, the rear electrical contact has a front surface (31?) in electrical contact with an elongated rear electrical contact bar (34), oriented horizontally across and in electrical contact with the rear strips of conductive ink.
    Type: Grant
    Filed: August 13, 2010
    Date of Patent: April 2, 2013
    Assignee: Hunter Fan Company
    Inventors: Stephen M. Gatchell, Benjamin David Freeman
  • Patent number: 8105425
    Abstract: An air filter including a plurality of air-pervious sheets of electret filtration material. The sheets are disposed in a parallel relationship to form a stack of sheets, and each of the sheets has a plurality of slits formed therein for subsequent expanding to form openings. The stack is connected together at opposing ends, such as by bonding. The sheets can be pleated by mounting in a frame. The frame has opposing ends to which the opposing ends of the stack are mounted. The filter media initially has no frame and is not pleated, but is in a flat pad form that is expanded to be installed into a frame. The frame is then mounted in an appliance, such as a room air filter. When the filter is inserted into the filter housing it is expanded and can take a pleated form.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: January 31, 2012
    Assignee: Columbus Industries, Inc.
    Inventors: Thaddeus J. Ptak, Chrystal B. Gillilan, Russell Baldinger
  • Patent number: 8070861
    Abstract: Improvements in active field polarized media air cleaner include an aerodynamic front cowling to reduce static air resistance, a rear double hinge to reduce blow by, a resistive center screen permitting the sharing of high voltage power supplies while reducing the tendency to arc and allowing for a higher operational voltage, a dielectric media support frame to produce a more uniform electrostatic field and reduce blow by, while at the same time reducing the tendency to spray corona and/or arc at the edges of the center screen, a substantially flat conductive outer screen to produce a more uniform electrostatic field throughout the filter media and a high-voltage shield to reduce high-voltage arcing and the spraying of corona where the high-voltage probe contacts the center screen.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: December 6, 2011
    Assignee: Environmental Management Confederation, Inc.
    Inventors: Forwood C. Wiser, George R. Summers, Benjamin H. Kaeppner
  • Patent number: 8021455
    Abstract: A filter element having multiple formed layers of filtration media is disclosed. The media are layered so as to form a pore size gradient. The filter element is capable of removing both solid and liquid particulates from a moving fluid stream. The filter element has high strength and compressibility. The layers can be supported on a porous or perforate support to provide mechanical stability during filtering operations. The filtration media layers can be formed into various filter element forms such as panels, cartridges, inserts, and the like.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: September 20, 2011
    Assignee: Donaldson Company, Inc.
    Inventors: Daniel E. Adamek, Jan Cappuyns, Egide Emmanuel Paul Baudry Moreau, Ming Ouyang, Robert M. Rogers
  • Patent number: 7951229
    Abstract: An air filter including a plurality of air-pervious sheets of electret filtration material. The sheets are disposed in a parallel relationship to form a stack of sheets, and each of the sheets has a plurality of slits formed therein for subsequent expanding to form openings. The stack is connected together at opposing ends, such as by bonding. The sheets can be pleated by mounting in a frame. The frame has opposing ends to which the opposing ends of the stack are mounted. The filter media initially has no frame and is not pleated, but is in a flat pad form that is expanded to be installed into a frame. The frame is then mounted in an appliance, such as a room air filter. When the filter is inserted into the filter housing it is expanded and can take a pleated form.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: May 31, 2011
    Assignee: Columbus Industries, Inc.
    Inventors: Thaddeus J. Ptak, Chrystal B. Gillilan, Russell Baldinger
  • Patent number: 7896957
    Abstract: An air purifier includes a shell with an air inlet and an air outlet. An electric field filter, an air passage and a blower are disposed inside the shell. The electric field filter includes a filter frame disposed at the air outlet and a grid base disposed under the filter frame. A filter is provided inside the filter frame. One end of the air passage connects with the grid base and the other end connects with the blower. The blower is disposed at the air inlet. The filter frame and the grid base are integrated as a hermetic whole. Due to the integrated configuration of the filter frame and the grid base, when removing out the electric field filter, the power is cut automatically. This effectively prevents an occurrence of the electroshock, and improves safety performance of the purifier. Furthermore, air leakage can be greatly reduced, for there is no gap between the filter frame and the grid base.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: March 1, 2011
    Assignee: Shenzen Qibin Enterprises
    Inventors: Bing Zhao, Ming-Jen Wang, Junsui Wang
  • Patent number: 7883572
    Abstract: A cleanable filter for particulate material, includes a zigzag pleated filter pack, spacers disposed between the pleats in the filter pack and a frame having an upper and lower part covering the respective upper and lower side of the filter pack that contains the ends of the fold lines and two lateral parts covering the opposite sides of the filter pack that contains the ends of the filter medium zigzag folded into a filter pack, the frame thereby leaving the opposite sides of the filter pack that contains alternate fold lines of the pleated filter pack, free for the passage of air. The filter medium in the filter pack includes a pleated sheet of polytetrafluorethylene and the spacers between the pleats consist of corrugated aluminum foils. An earthing element furthermore electrically connects the aluminum foils to each other and to an earth connection on the outside of the filter frame.
    Type: Grant
    Filed: January 12, 2006
    Date of Patent: February 8, 2011
    Assignee: Camfil AB
    Inventor: Eckhard Neudeck
  • Patent number: 7862650
    Abstract: An electrostatic precipitator element includes preferably a mesh made of at least two individually insulated conductors with defined openings therebetween. An electrical field in the openings electrostatically attracts suspended particulate to a respective conductor for collection.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: January 4, 2011
    Assignee: Pratt & Whitney Canada Corp.
    Inventor: Kevin Allan Dooley
  • Patent number: 7857892
    Abstract: The disclosure relates to an air pollution sensor system incorporated in an enclosure, the enclosure including an air handling system inside an air duct, the air duct enabling a communication between air inside the enclosure and air outside the enclosure. The air duct including an air inlet for receiving air and an air outlet for releasing handled air inside the enclosure. The air pollution sensor system includes at least one ultra fine particle sensor capable of sensing particles with a diameter in a range of approximately 5-2500 nm, preferably in a range of approximately 5-1000 nm and more preferably in a range of approximately 5-500 nm inside the enclosure and providing a pollution information signal in response to the sensing of the particles. The disclosure further relates to various types of ultra fine particle sensors and air handling systems.
    Type: Grant
    Filed: August 10, 2005
    Date of Patent: December 28, 2010
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Johan Marra
  • Patent number: 7815720
    Abstract: A dual-filter electrically enhanced air-filtration apparatus and method are described. One embodiment includes an upstream electrically enhanced filter; a downstream electrically enhanced filter; a first control electrode adjacent to an upstream side of the upstream electrically enhanced filter; a second control electrode adjacent to a downstream side of the downstream electrically enhanced filter; and an ionizing electrode disposed between the upstream and downstream electrically enhanced filters, the ionizing electrode having an electrical potential with respect to the first and second control electrodes. Optional field electrodes may be included to enhance the electric fields associated with the upstream and downstream electrically enhanced filters.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: October 19, 2010
    Assignee: StrionAir, Inc.
    Inventor: Peter J. McKinney
  • Patent number: 7815719
    Abstract: A system and method for ionization detection in electrically enhanced air filtration systems is described. One embodiment includes a system for electrically enhanced air filtration, the system including an electrically enhanced filter having a filter and an ionizing electrode disposed on an upstream side of the filter; a control device connected to the electrically enhanced filter, wherein the control device can control the electrically enhanced filter; and an ionization detector, wherein the ionization detector is adjacent to the electrically enhanced filter and wherein the ionization detector is connected to the control device.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: October 19, 2010
    Assignee: StrionAir, Inc.
    Inventors: Peter J. McKinney, Adam J. Cohen
  • Publication number: 20100126343
    Abstract: An electrically enhanced air filter apparatus for filtering particles from moving air is described. The apparatus includes a filter arranged so particles approach the filter a filter speed and pass through an ionizer at an ionizer speed, and is configured so the filter speed is less than the ionizer speed. The ionizer is arranged to guide the moving air in an ionizer airflow direction and generates an ionizing electric field having ionizer field direction substantially perpendicular to the ionizer airflow direction.
    Type: Application
    Filed: November 25, 2008
    Publication date: May 27, 2010
    Applicant: DELPHI TECHNOLOGIES, INC.
    Inventors: Donald John Enzinna, Ilya Reyzin
  • Publication number: 20100107882
    Abstract: An electrostatic precipitator element comprises preferably a mesh made of at least two individually insulated conductors with defined openings therebetween. An electrical field in the openings electrostatically attracts suspended particulate to a respective conductors for collection.
    Type: Application
    Filed: January 13, 2010
    Publication date: May 6, 2010
    Applicant: PRATT & WHITNEY CANADA CORP.
    Inventor: Kevin Allan DOOLEY
  • Patent number: 7691168
    Abstract: A charged multilayer filter includes a hydrocharged filtration layer containing a plurality of intertwined nanofibers that have a finite length of about 12 to about 300 mm, atop a porous roll-to-roll processable support layer.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: April 6, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: Andrew R. Fox, Marvin E. Jones
  • Patent number: 7691186
    Abstract: A pleated filter media includes a plurality of parallel conductive beads to support the media and space the pleated surfaces apart. A high voltage differential applied between adjacent conductive beads induces an electrostatic field within the filter media, thereby increasing the efficiency of the filter.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: April 6, 2010
    Assignee: Environmental Management Confederation, Inc.
    Inventor: Forwood C Wiser
  • Patent number: 7686869
    Abstract: Improvements in active field polarized media air cleaner include an aerodynamic front cowling to reduce static air resistance, a rear double hinge to reduce blow by, a resistive center screen permitting the sharing of high voltage power supplies while reducing the tendency to arc and allowing for a higher operational voltage, a dielectric media support frame to produce a more uniform electrostatic field and reduce blow by, while at the same time reducing the tendency to spray corona and/or arc at the edges of the center screen, a substantially flat conductive outer screen to produce a more uniform electrostatic field throughout the filter media and a high-voltage shield to reduce high-voltage arcing and the spraying of corona where the high-voltage probe contacts the center screen.
    Type: Grant
    Filed: December 29, 2006
    Date of Patent: March 30, 2010
    Assignee: Environmental Management Confederation, Inc.
    Inventors: Forwood C Wiser, George R Summers, Benjamin H Kaeppner
  • Publication number: 20100035537
    Abstract: An air cleaner, which includes a casing having an enclosed air passage with a ventilation pipe for guiding in outdoor air, a windpipe affixed to one side of the casing for circulation of indoor air, a damper pivotally mounted in between the casing and the windpipe for controlling the passage the casing and the windpipe and flowing direction of air between the casing and the windpipe, and an air filter and a negative ion generator mounted in the windpipe for cleaning air passing through the windpipe.
    Type: Application
    Filed: August 7, 2008
    Publication date: February 11, 2010
    Inventor: James HO
  • Patent number: 7655076
    Abstract: Air cleaning device has a particle charging zone comprising a conducting sheet having a plurality of apertures, through which air can be passed, and a plurality of corona emitters each associated with an aperture, and a filter.
    Type: Grant
    Filed: April 21, 2005
    Date of Patent: February 2, 2010
    Assignee: Darwin Technology International Limited
    Inventors: George Griffiths, Geoffrey Norman Walter Gay
  • Patent number: 7608135
    Abstract: An air conditioning system includes an air flow pathway extending through a housing from an inlet to an outlet. Air conditioning apparatus is disposed in the airflow pathway between the inlet and the outlet conditioning an air stream passing through the air flow pathway from the inlet to the outlet. A modular electrically stimulated air filter apparatus is carried by opposed, parallel frameworks mounted in series in the air flow pathway between the inlet and the air conditioning apparatus filtering entrapping contaminants in the air stream flowing through the housing from the inlet to the outlet. The opposed parallel frameworks are mounted to opposed supports affixed to the housing.
    Type: Grant
    Filed: March 14, 2008
    Date of Patent: October 27, 2009
    Inventors: Peter J. Mello, Kenneth B. Tippets, Jr., Margaret W. Crumpton
  • Patent number: 7531028
    Abstract: An air conditioning system includes an air flow pathway extending through a housing from an inlet to an outlet. Air conditioning apparatus is disposed in the airflow pathway between the inlet and the outlet conditioning an air stream passing through the air flow pathway from the inlet to the outlet. A modular electrically stimulated air filter apparatus is carried by opposed, parallel frameworks mounted in series in the air flow pathway between the inlet and the air conditioning apparatus filtering entrapping contaminants in the air stream flowing through the housing from the inlet to the outlet. The opposed parallel frameworks are mounted to opposed supports affixed to the housing.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: May 12, 2009
    Assignee: Y2 Ultra-Filter, Inc.
    Inventors: Peter J. Mello, Kenneth B. Tippets, Jr., Mark Vanderginst
  • Patent number: 7364607
    Abstract: A wrought fiber sheet or air cleaning filter unit that exhibits high performance and is biodegradable so as to enable reducing load upon environment. The wrought fiber sheet is produced by coupling biodegradable fiber sheets having electret properties by means of a configuration reinforcing member of a biodegradable material. Further, the frame for accommodating the wrought fiber sheet is also constituted of a biodegradable member so as to obtain an air cleaning filter unit that exerts biodegradability as a whole.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: April 29, 2008
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Kazuhiro Ueda, Toyota Seki
  • Patent number: 7160363
    Abstract: This publication discloses an electrostatic filter construction, which includes electrodes connected to a first electrical potential, second electrodes, which are electrically insulated from the first electrodes, and an insulating material acting as a particle filter, which is located between the first and the second electrodes. According to the invention, in both of the electrodes the electrode material used is a material, such as activated carbon, which is permeable to a gas and which filters the gas, and which has a low electrical conductivity, and both electrodes are located essentially parallel to the direction of the airflow.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: January 9, 2007
    Assignee: Oy Lifa Iaq Ltd.
    Inventors: Ilpo Kulmala, Kimmo Heinonen
  • Patent number: 7156898
    Abstract: A method and apparatus using deep pleated filters to provide efficient and safe electrically enhanced filtering (EEF), with ultra low pressure drop, higher efficiency of particulate removal and higher dirt holding capacity over the life of the filter. An EEF may be constructed with a housing, with or without an internal air moving device such as a fan, a deeply pleated filter, preferably a V-pack filter with sets of downstream ground electrodes and charge transfer electrodes borne by the exterior surface of the filter packs that form the filtering element. An ionizer assembly that ionizes the gas and charges particles entering the deeply pleated filter and also transfers a charge to the charge transfer electrodes on the filter pack. A plate seals the gasket on the filtering element against the ionizing assembly. A high electrical potential is applied to charging elements in the ionizer and, in some embodiments, a fan or motor assembly.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: January 2, 2007
    Inventor: Rajan A. Jaisinghani
  • Patent number: 7025806
    Abstract: A filter assembly particularly useful in electronically enhanced air cleaning systems including a fibrous filter media. A conductive electrode is affixed to the fibrous filter media, so that the conductive electrode makes physical contact to the fibrous filter media in a plurality of substantially planar locations. The conductive electrode is coupled to a potential that enables neutralizing charge that accumulates on the filter media during operation to be removed thereby maintaining high efficiency.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: April 11, 2006
    Assignee: Stri{dot over (o)}nAir, Inc.
    Inventors: Rex Coppom, Sven Coppom, Brian Coppom
  • Patent number: 7014688
    Abstract: A particle precipitation device for removing particles entrained in a gas stream includes an array of passages through which a gas stream can be directed relatively freely. The passages are provided between plastics walls adapted to create an electrical field within the array. The plastics walls may have areas of conductive material in contact therewith. High and low electrical potentials alternately applied to isolated areas of the conductive material provide charged sites in the array for collecting particles from the gas stream. Alternatively, the plastics walls may have electret properties.
    Type: Grant
    Filed: June 8, 2004
    Date of Patent: March 21, 2006
    Assignee: Darwin Technology Limited
    Inventors: George Griffiths, Geoffrey Norman Walter Gay
  • Patent number: 7008465
    Abstract: An improved cartridge, typically in cylindrical or panel form that can be used in a dry or wet/dry vacuum cleaner. The cartridge is cleanable using a stream of service water, or by rapping on a solid object, or by using a compressed gas stream, but can provide exceptional filtering properties even for submicron particulate in the household or industrial environment. The cartridge has a combination of nanofiber filtration layer on a substrate. The nanofiber and substrate are engineered to obtain a maximum efficiency at reasonable pressure drop and permeability. The improved cartridge constitutes at least a substrate material and at least a layer including a non-woven, fine fiber separation layer.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: March 7, 2006
    Assignee: Donaldson Company, Inc.
    Inventors: Kristine M. Graham, Timothy H. Grafe, Mark A. Gogins
  • Patent number: 7008469
    Abstract: A portable air filtration system includes a filter housing having an air inlet and outlet. The housing defines a filtration chamber between the inlet and outlet. The air filtration system uses an intake fan, an ionizing mechanism, a filter media, and a conductive coating to filter air. The fan moves the air through the chamber. The ionizing mechanism ionizes particles within the air to a negative charge. The media includes an upstream side facing the inlet and a downstream side facing the outlet and is disposed between the ionizing mechanism and the outlet to entrap the particles. The conductive coating is applied to the upstream side of the media. This establishes an electric field between the ionizing mechanism and the conductive coating. Furthermore, the upstream side of the media is electrically-connected to ground through the conductive coating for dissipating the negative charge of the particles entrapped within the media.
    Type: Grant
    Filed: August 25, 2003
    Date of Patent: March 7, 2006
    Assignee: Delphi Technologies, Inc.
    Inventors: Stephan Michael Vetter, Donald John Enzinna
  • Patent number: 6989051
    Abstract: A portable air filtration system includes a filter housing having an air inlet and an air outlet. The filter housing defines a filtration chamber between the air inlet and the air outlet. The portable air filtration system uses an ionizing mechanism, a filter media, and an electrode to filter air. The ionizing mechanism ionizes particles within the air to a negative charge. The filter media is disposed between the ionizing mechanism and the air outlet for entrapping the particles. The electrode is disposed between the ionizing mechanism and the filter media to establish an electric field. The electric field is established between the ionizing mechanism and the electrode adjacent to the filter media. The electrode is also electrically-connected to ground and to the filter media for dissipating the negative charge of the particles entrapped within the filter media.
    Type: Grant
    Filed: August 25, 2003
    Date of Patent: January 24, 2006
    Assignee: Delphi Technologies, Inc.
    Inventors: Mark Joseph Parisi, Donald John Enzinna, Susan Claire Vasko, Ilya Reyzin, Stephan Michael Vetter
  • Patent number: 6932850
    Abstract: A filter may comprise a plurality of pleats, at least one pleat including a pair of pleat legs and pleat tip region. In some embodiments, a thickness of pleat tip region at a point spaced about one to four pleat leg thicknesses from the end of the pleat tip region may be less than or equal to about twice the pleat leg thickness or may be less than or equal to a distance between corresponding points on opposing outer surfaces of the pleat legs. A filter may comprise a pleated structure having a plurality of pleats. In some embodiments, the pleated structure may have more than one layer and at least one of the pleats may have a reformed pleat tip region. In other embodiments, the pleated structure may have a pair of pleat legs and at least one of the pleats may have a reformed pleat tip region and contacting pleat legs. A filter may comprise a plurality of pleats, at least one pleat including a pleat tip region having contacting inner surfaces.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: August 23, 2005
    Assignee: Pall Corporation
    Inventors: Thomas C. Welch, Joseph Verschneider, John D. Miller
  • Publication number: 20040226448
    Abstract: A particle precipitation device for removing particles entrained in a gas stream includes an array of passages through which a gas stream can be directed relatively freely. The passages are provided between plastics walls adapted to create an electrical field within the array. The plastics walls may have areas of conductive material in contact therewith. High and low electrical potentials alternately applied to isolated areas of the conductive material provide charged sites in the array for collecting particles from the gas stream. Alternatively, the plastics walls may have electret properties.
    Type: Application
    Filed: June 8, 2004
    Publication date: November 18, 2004
    Applicant: Darwin Technology Limited
    Inventors: George Griffiths, Geoffrey Norman Walter Gay
  • Patent number: 6793715
    Abstract: The invention provides a filter that can be cut-to-fit or deformed to fit a variety of differently shaped and sized intakes. The invention also provides a filter kit that allows a user to create a filter of a desired size with attaching mechanisms to secure the filter to or on the intake.
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: September 21, 2004
    Inventor: Leslye Sandberg
  • Patent number: 6749669
    Abstract: A particle precipitation device for removing particles entrained in a gas stream includes an array of passages (10) through which a gas stream can be directed relatively freely. The passages are provided between plastics walls adapted to create an electrical field within the array. The plastics walls may have areas of conductive material (1, 2) in contact therewith. High and low electrical potentials alternately applied to isolated areas of the conductive material provide charged sites in the array for collecting particles from the gas stream. Alternatively, the plastics walls may have electret properties.
    Type: Grant
    Filed: February 5, 2002
    Date of Patent: June 15, 2004
    Assignee: Darwin Technology Limited
    Inventors: George Griffiths, Geoffrey Norman Walter Gay
  • Patent number: 6663695
    Abstract: A method for cleaning air utilizing an air cleaner which is smaller than conventional air cleaners, wherein a filter is formed on the peripheral portion of a disk and the filter is bent into a wave-shape such that irregularities of the wave are formed in the radial direction of the disk, so that air existing on the inside area of the disk is discharged to the outside of the disk through the filter.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: December 16, 2003
    Assignee: Kankyo Co., Ltd.
    Inventors: Hidetoshi Ike, Yasushi Ishikawa, Shigemi Watanabe, Kazunari Kakuta
  • Patent number: 6660061
    Abstract: A vapor filtration device including a first electrode, a second electrode, and a filter between the first and second electrodes is disclosed. The filter is formed of dielectric material and the device is operated by applying a first electric potential between the electrodes to polarize the dielectric material such that upon passing a vapor stream through the filter, particles from the vapor stream are deposited onto the filter. After depositing the particles a second higher voltage is applied between the electrodes to form a nonthermal plasma around the filter to vaporize the collected particles thereby cleaning the filter. The filter can be a packed bed or serpentine filter mat, and an optional upstream corona wire can be utilized to charge airborne particles prior to their deposition on the filter.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: December 9, 2003
    Assignee: Battelle Memorial Institute
    Inventors: Gary B. Josephson, William O. Heath, Christopher L. Aardahl
  • Patent number: 6635106
    Abstract: A dust is electrostatically charged using an ion-releasing device adapted to release only ionized air with occurrence of a corona discharge, thereby reducing the amount of power consumed and the amount of ozone generated to the utmost. An electric dust collector includes a charging section having a discharging electrode and an earthed electrode, a dust-collecting section having a voltage-applied electrode and an earthed electrode and an air feed fan. Dust introduced into the dust collector is electrostatically charged by breaking the air insulation by a corona discharge occurring in the charging section to produce ionized air and then removed in the dust-collecting section where an electric field is formed. However, because the corona discharge is generated, there is a problem that the discharged current is large, and the amount of power consumed and the amount of ozone generated are large.
    Type: Grant
    Filed: October 31, 2001
    Date of Patent: October 21, 2003
    Assignee: Matsushita Seiko Co., Ltd.
    Inventors: Ryou Katou, Yoshikazu Tashiro
  • Patent number: 6589317
    Abstract: An electrostaticly charged filtration media is provided including a plurality of polymeric structured polymeric film layers having a structured surface defined on at least one face of each structured film layer forming at least in part flow channels. The plurality of structured film layers are configured as a stack with the structured surfaces defining a plurality of ordered inlets open through a face of the stack that are in fluid communication with ordered fluid pathways. Each fluid pathway is defined at least in part by at least one discrete flow channel such that fluid can flow substantially unimpeded from one of the inlets to an outlet opening at another face of the stack. A layer of fluid pathways is defined by two opposing charged film layers at least one of which is a structured film layer. The flow channels have an average height of from 0.1 mm to 5 mm and an average width of from 0.05 mm to 50 mm and an average aspect ratio of from 0.5 to 10.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: July 8, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Zhiqun Zhang, Tien T. Wu, Yuan-Ming Tang, Brian E. Spiewak
  • Patent number: 6585803
    Abstract: A sintered stainless steel filter is used as the grounded electrode of a point-to-plane electrostatic precipitator. Particles flow through, rather than parallel to, the collection plate. Particle collection efficiency is empirically shown to increase as the charged particles are drawn closer to the grounded filter. The utilization of stainless steel fiber filter provides (1) low particle penetration (high particle collection efficiency) of different particle range, (2) applicability to all different particulate components, (3) high loading capacity but low pressure drop (less energy and maintenance needed), (5) low electric voltage for operating the system, and (6) low cost and small dimension.
    Type: Grant
    Filed: May 11, 2000
    Date of Patent: July 1, 2003
    Assignee: University of Southern California
    Inventors: Ming-Chih Chang, Seongheon Kim, Constantinos Sioutas
  • Patent number: 6579350
    Abstract: A pleatable high efficiency non-woven, gas filtration media is provided. The media has an electrically charged air laid fibrous layer with a thickness between about 2 and about 35 mils, and a wet laid fibrous layer having a thickness of between about 5 and about 35 mils. The combined layers have, (a) a thickness of between about 10 and about 50 mils, (b) a stiffness of between about 200 and about 3500 mgs, (c) a Frazier of between about 10 and about 400 CFM, and (d) an &agr; of at least 15.
    Type: Grant
    Filed: November 13, 2001
    Date of Patent: June 17, 2003
    Assignee: Lydall, Inc.
    Inventor: Joseph P. Doherty
  • Patent number: 6524488
    Abstract: A filtration media is formed from at least one structured polymeric layer, wherein a structured surface is defined within the layer. Layers may be configured as a stack that has the structured surfaces defining a plurality of ordered inlets open through a face of the stack and corresponding ordered fluid pathways, thereby forming an ordered, porous volume. The ordered fluid pathways may be defined by a plurality of flow channels formed within the structured surfaces of the structured layers, or may be defined by a plurality of protuberances formed in an ordered pattern within the structured surfaces of the structured layers.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: February 25, 2003
    Assignee: 3M Innovative Properties Company
    Inventors: Thomas I. Insley, Raymond P. Johnston