US3798879A - Air filter with electrostatic particle collection - Google Patents

Air filter with electrostatic particle collection Download PDF

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Publication number
US3798879A
US3798879A US00202747A US20274771A US3798879A US 3798879 A US3798879 A US 3798879A US 00202747 A US00202747 A US 00202747A US 20274771 A US20274771 A US 20274771A US 3798879 A US3798879 A US 3798879A
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US
United States
Prior art keywords
mat
filter
gas stream
particles
fibers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00202747A
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English (en)
Inventor
Burbach G Schmidt
A Jung
E Ledwon
W Rock
H Hubert
M Lapczyna
H Strauss
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Buderus AG
Original Assignee
BuderusSche Eisenwerke AG
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Filing date
Publication date
Priority claimed from DE19702058685 external-priority patent/DE2058685A1/de
Priority claimed from DE19712125234 external-priority patent/DE2125234A1/de
Application filed by BuderusSche Eisenwerke AG filed Critical BuderusSche Eisenwerke AG
Application granted granted Critical
Publication of US3798879A publication Critical patent/US3798879A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/155—Filtration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/45—Woven filter mediums

Definitions

  • a filter for purifying air at least in part by electrostaticcollection of particulates contained therein, has at least one charged gas-permeable filter surface extending transversely to the gas stream and designed mechanically to retain the particles by interposing a surface in the path of the gas.
  • the electrostatic field is applied in the direction of movement of the gas stream.
  • the particles may be charged by an ionizing device at the upstream side of the apparatus.
  • Our present invention relates to an apparatus for purifying air by the filtration of particulates therefrom and, more particularly, to a gas-purifying filter operating at least in part by electrostatic collection of particulates.
  • such filters operate by mechanical interception of the particles, i.e., having a pore size which governs the size of the particles which can be intercepted by a filter. Smaller particles traverse the filter and attempts to reduce the pore size lead only to high pressure drops and increasing impediment to gas flow.
  • Electrostatic precipitators have been proposed to alleviate this problem, the gas stream being passed through channels defined by oppositely charged plates, wires or screens, the latter representing collector electrodes which lie in arrays parallel to the direction of flow of the gas.
  • the gas stream is subjected to a charging field, e.g., a corona discharge, and charged particles are accumulated by absorption or dipole association with the dust particles in the gas stream.
  • the electrically charged dust particles then transfer charge to the collector electrode to which they adhere.
  • electrostatic precipitators provide substantially less of an obstruction to the gas stream and hence operate with less pressure drop than a throughflow filter of the same dust-removal capacity, some difficulties are encountered. Firstly, the particles collected on the electrode are held only by mechanical forces and frequently are dislodged or entrained by the gases passing along the electrode parallel thereto. As a result, particulates which originally were precipitated electrostatically may eventually reach the outlet. Furthermore, the collector electrodes become contaminated readily by grease particles or the like, which cannot be readily removed and which prevent rappers or the like from dislodging the particles collected on the electrodes. Also electrostatic precipitators, in which the electrode arrays run parallel to the direction of flow of the gas stream, frequently require extremely high potentials or potential gradients to effectively collect the contaminants contained in the gas stream.
  • Another object of the invention is to provide a compact high-frequency filter requiring lower electrostatic potential gradients than conventional electrostatic precipitators while having an increased efficiency and reduced tendency to pass small particles.
  • the present invention provides a mechanical entrapment filter directly across and at right angles to the path of the gases, i.e., a layer which is perpendicularly traversed by the gases and which is capable of mechanically trapping particles contained therein.
  • the filter layer is made up of electrically conductive filaments or at least filaments, fibers or strands of such conductivity that the electrostatic particles collecting potential can be applied across this electrode-filter element and a counterelectrode spaced therefrom in the direction of flow of the gas. It will be apparent that this arrangement prevents particles which are gathered in the layer from being entrained by gas even after the particle has lost its charge.
  • the electrically conductive filter mats are conductively tied to the electrostatic potential source and may include two spacedapart but parallel mats forming the two electrodes of the system.
  • The, or each, mat can be made simply and inexpensively from filamentary materials or synthetic resin or glass fibers to which sufficient metal particles or carbon have been added to provide a suitable electrical conductivity, or with which metal fibers have been intercollated so that the mat as a whole may be metallized by galvanic or chemical metal plating.
  • the filter mat may be of the nonwoven or random-fiber type or may be woven or knitted, e.g., from steel wire in a mesh or interstitial-opening size sufficiently small as to prevent particles with a diameter of 1 micron from passing through. When such mats are electrostatically charged, they are found to be able to collect particles with a size substantially smaller than 1 micron.
  • a device for ionizing the air preferably a B-ray generator, or a corona-discharge and/or ultraviolet ionization device. Best results are obtained with a U.V. lamp having corona-discharge wires extending therefrom and across which a high potential is applied.
  • the filter material, mat or web is relatively inexpensive and can constitute a reusable or disposable mechanical filter of high efficiency. Since either metal fibers or metallized nonconductive fibers may be used, a wide variety of materials can be employed and the costs can be minimized.
  • the filter mats can be formed by conventional procedures at a small cost above that of fabric filter layers, a vast improvement in filter efficiency and a considerable reduction in the particle size of the substances traversing the filter may be obtained.
  • the pressure drop of the air traversing the filter can be reduced so that the filter may have less resistance.
  • a simpler blower or fan may thus be used in conjunction with the device.
  • the electrostatic potential gradient is applied in the direction of gas flow and does not have to resist or interfere with the inertia or kinetic energy of the moving particles and thus can be reduced.
  • Lowpotential sources such as low-capacity generators, distribution circuits and the like may be employed.
  • the air filter has been found to be particularly suitable for the removing of particles in the physiologically interesting range of one micron and therebelow.
  • the conductive mats remain nevertheless effective to a limited extent.
  • FIG. 1 is an axial cross-sectional view of an air filter embodying the present invention
  • FIG. 2 is a view similar to FIG. 1 illustrating a modification
  • FIG. 3 is another axial cross-sectional view showing a feature of the present invention.
  • FIG. 4 is an enlarged diagrammatic cross-sectional view through a portion of a fiber mat according to the invention.
  • FIG. 5 is an elevational view of a portion of the mat
  • FIG. 6 is a view similar to FIG. 4, illustrating another embodiment of the mat.
  • an air filter-according to the present invention comprises a duct 1 having an inlet la and an outlet lb, at least one of which may be provided with a fan, blower or other conventional mechanism for displacing the air through the system.
  • the housing 1 may be flanged at 10 to enable removal of a filter cartridge generally represented at 2 and comprising a pair of conductive fiber mats 3 of steel wool pressed into disk configuration and received in frames 3a and 3b.
  • an electrostatic potential source having a voltage of, say, 100 300 volts do. is provided at 10 and has its positive and negative terminal connected to the mats 3 through insulators l1 and 12.
  • the frames 3a and 3b are spaced apart by an insulating ring 4. It will be apparent that charged particles traversing the filter 2,. 3, 3a, 3b and 4, will be mechanically trapped on the mats 3 and electrostatically trapped if negatively and positively charged in accordance with principles of electrostatic precipitators. Upstream of the cartridge 2, which may be disposed of when fully contaminated, an ionization source may be provided as described in connection with FIG. 3.
  • FIG. 2 we show an arrangement wherein the housing 13 is formed at its upstream side with an ultraviolet lamp 5 whose positive and negative terminals extend from the duct and which is provided with coronadischarge wires 6 connected to a high negative potential.
  • the positive terminal of the electrostatic field generator is provided in the woven steel wire mat 14 in its insulating frame 15.
  • FIG. 3 illustrates yet another modification of the invention therein the upstream perforated disk 20 is constituted as a B-particle emitter by the incorporation of radioactive material therein.
  • the downstream electrode 21 is composed of a sintered metal-wire mat in which the filaments are fused together at their contact points to produce a rigid body.
  • the electrostatic potential source is shown to be a pair of terminals 23 connected across the normal alternating current supply line 110, 220, 440, etc., volts a.c. in circuit with a switch 24 and a full-wave rectifier bridge 25.
  • a simple propeller-type fan 26 is mounted in the downstream side of the housing and is reversible to induce a flow of air through the system.
  • the butterfly flap 27 of the inlet 28 of housing 29 is opened and flap 3% is closed so that air flows from the inlet 28 to the outlet 31 with normal filtration.
  • switch 24 When switch 24 is opened, motor 26 reversed, flap 30 opened and flap 27 closed, a cleaning flow of air in the opposite sense carries particles collected on the electrode 21 through the branch 32 and into a collecting vessel.
  • FIG. 4 we have shown a metallized web which may be used according to the present invention and which is woven from glass fibers 40 provided with nickel coatings 41. As illustrated in FIG. 5, the resulting web has the appearance of a tightly woven fabric layer 42.
  • the randomly packed fiber mat 50 is composed of a mixture of filaments 51 of synthetic resin coated with metal and filaments 52 of the uncoated synthetic resin. It is thus possible to control the conductivity of the mat as a whole.
  • a filter comprising conduit means for conducting a stream of air from an inlet side to an outlet side; at least one electrically conductive filter of metallic fibers mat spanning said path and perpendicular thereto while traversed by the gas stream; a counterelectrode in said conduit means upstream of said metallic fiber mat; means for generating a potential difference parallel to said gas stream between said electrodes in the region of said mat to cause particles in said gas stream to be drawn electrostatically to said mat; and an ultraviolet source in said conduit means upstream of said counterelectrode for generating ions in said gas stream, said counterelectrode including wires extending generally parallel to the direction of flow of said gas stream and reaching to said ultraviolet source.

Landscapes

  • Electrostatic Separation (AREA)
  • Filtering Materials (AREA)
US00202747A 1970-11-28 1971-11-29 Air filter with electrostatic particle collection Expired - Lifetime US3798879A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19702058685 DE2058685A1 (de) 1970-11-28 1970-11-28 Elektro-Luftfilter
DE19712125234 DE2125234A1 (en) 1971-05-21 1971-05-21 Electrostatic precipitator - employing filter plates of fibre part or all of which is electrically conductive

Publications (1)

Publication Number Publication Date
US3798879A true US3798879A (en) 1974-03-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00202747A Expired - Lifetime US3798879A (en) 1970-11-28 1971-11-29 Air filter with electrostatic particle collection

Country Status (4)

Country Link
US (1) US3798879A (enExample)
FR (1) FR2115827A5 (enExample)
GB (1) GB1379738A (enExample)
IT (1) IT942698B (enExample)

Cited By (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918939A (en) * 1973-08-31 1975-11-11 Metallgesellschaft Ag Electrostatic precipitator composed of synthetic resin material
DE2721528A1 (de) * 1977-05-12 1978-11-16 Manfred R Burger Verfahren und vorrichtung zur reinigung von gasen
FR2390209A1 (fr) * 1977-05-12 1978-12-08 Burger Manfred Procede et dispositif de filtration electrostatique pour l'epuration de gaz
US4344776A (en) * 1979-06-27 1982-08-17 Amcor Ltd. Electrostatic air filter
US4382866A (en) * 1980-12-09 1983-05-10 Johnson Dennis E J Electro-chemical system for liquid filtration
US4491551A (en) * 1981-12-02 1985-01-01 Johnson Dennis E J Method and device for in-line mass dispersion transfer of a gas flow into a liquid flow
US4555252A (en) * 1983-06-04 1985-11-26 Dragerwerk Aktiengesellschaft Electrostatic filter construction
US4662903A (en) * 1986-06-02 1987-05-05 Denki Kogyo Company Limited Electrostatic dust collector
US4666478A (en) * 1984-10-17 1987-05-19 E.F.C. Control Inc. Scrubber apparatus for purifying foul air produced during an embalming, an autopsy or the like
US4940470A (en) * 1988-03-23 1990-07-10 American Filtrona Corporation Single field ionizing electrically stimulated filter
US4969328A (en) * 1986-10-21 1990-11-13 Kammel Refaat A Diesel engine exhaust oxidizer
US5009683A (en) * 1989-07-24 1991-04-23 Sun Shin Ching Purifying air conditioner
WO1993023171A1 (fr) * 1992-05-13 1993-11-25 Elena Vladimirovna Volodina Dispositif de nettoyage et de filtrage biologique d'air
US5330722A (en) * 1991-02-27 1994-07-19 William E. Pick Germicidal air filter
US5330559A (en) * 1992-08-11 1994-07-19 United Air Specialists, Inc. Method and apparatus for electrostatically cleaning particulates from air
US5474599A (en) * 1992-08-11 1995-12-12 United Air Specialists, Inc. Apparatus for electrostatically cleaning particulates from air
US5476538A (en) * 1993-07-13 1995-12-19 Japan Atomic Energy Research Institute Method of removing aerosols by the radiation effect
US5582632A (en) * 1994-05-11 1996-12-10 Kimberly-Clark Corporation Corona-assisted electrostatic filtration apparatus and method
US5681374A (en) * 1993-06-18 1997-10-28 Freshman Ab Device for the separation of microscopic particles out of air
US5716431A (en) * 1994-06-07 1998-02-10 Freshman Ab Device for separating extremely fine particles from air
US5837207A (en) * 1997-04-17 1998-11-17 Engineering Dynamics Limited Portable germicidal air filter
US5938823A (en) * 1997-04-18 1999-08-17 Carrier Corporation Integrated electrostatic collection and microwave sterilization for bioaerosol air purification
US5968215A (en) * 1998-01-20 1999-10-19 Dana Corporation Combined inlet outlet air filter element
US6019815A (en) * 1997-01-06 2000-02-01 Carrier Corporation Method for preventing microbial growth in an electronic air cleaner
US6022511A (en) * 1998-07-09 2000-02-08 Molecucare, Inc. Apparatus and method for germicidally cleaning air in a duct system
US6149717A (en) * 1997-01-06 2000-11-21 Carrier Corporation Electronic air cleaner with germicidal lamp
US6162285A (en) * 1997-05-08 2000-12-19 Applied Materials, Inc. Ozone enhancement unit
EP0994752A4 (en) * 1997-07-14 2001-03-07 Yujiro Yamamoto FILTER SYSTEM COMPRISING INDUCED VOLTAGE ELECTRODES AS WELL AS A DISPOSABLE CASE
US6221314B1 (en) 1997-11-04 2001-04-24 Wil Bigelow Air actinism chamber apparatus and method
US6228327B1 (en) 1998-07-09 2001-05-08 Molecucare, Inc. Apparatus and method for simultaneously germicidally cleansing air and water
US6228149B1 (en) 1999-01-20 2001-05-08 Patterson Technique, Inc. Method and apparatus for moving, filtering and ionizing air
US6500387B1 (en) 2000-05-19 2002-12-31 Nukuest, Inc. Air actinism chamber apparatus and method
US20030021721A1 (en) * 2002-07-16 2003-01-30 Microgenix Limited Purification of air
WO2004096413A1 (en) 2003-04-30 2004-11-11 Mikael Nutsos Conducting gas purification filter and filter assembly
US20050287051A1 (en) * 2004-06-23 2005-12-29 Yuen John S Photo-electronic air purifying and conditioning system
US20060005708A1 (en) * 2004-06-23 2006-01-12 Yuen John S Photo-electronic air purifying and disinfecting system
US20060005703A1 (en) * 2004-06-30 2006-01-12 Chi-Hsiang Wang Ultraviolet air purifier having multiple charged collection plates
US20060005707A1 (en) * 2004-06-23 2006-01-12 Yuen John S Photo-electronic air conditioning, dehumidifying, purifying and disinfecting system
US20060018805A1 (en) * 2004-07-19 2006-01-26 Yuen John S Photo-electronic air purifying disinfector
US20060263272A1 (en) * 2003-06-16 2006-11-23 Dionisio James L Cartridge device containing uvc for air disinfection. "uvbio-clean"
US20070266855A1 (en) * 2006-05-19 2007-11-22 Fleisher Aaron L Airplane air purifier
US20070275651A1 (en) * 2006-05-24 2007-11-29 American Innovative Research Corp. Positive air pressure isolation system
US20090017742A1 (en) * 2007-01-03 2009-01-15 John Anthony Diaks Ionized-re-circulating air-aircraft
US20100024653A1 (en) * 2003-04-30 2010-02-04 Mikael Nutsos Conducting air filter and filter assembly
US20120148445A1 (en) * 2010-12-10 2012-06-14 Samsung Electronics Co., Ltd. Deodorization and sterilization apparatus and method
WO2021073566A1 (zh) * 2019-10-18 2021-04-22 西安热工研究院有限公司 一种嵌入式静电除尘除雾器
US20220054787A1 (en) * 2020-08-24 2022-02-24 Teleflex Medical Incorporated Self-sealing respiratory filter and condensate management apparatus
US20240198309A1 (en) * 2021-09-13 2024-06-20 Topas Gmbh Technologie-Orientierte Partikel-, Analysen- Und Sensortechnik Device and method for separating particles from aerosols for conditioning test aerosols for penetration measurement on filters

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5376168A (en) * 1990-02-20 1994-12-27 The L. D. Kichler Co. Electrostatic particle filtration
US5405434A (en) * 1990-02-20 1995-04-11 The Scott Fetzer Company Electrostatic particle filtration

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US1931436A (en) * 1930-11-03 1933-10-17 Int Precipitation Co Electrical precipitating apparatus
US2067822A (en) * 1936-04-11 1937-01-12 Joseph B Biederman Mask for the prevention and relief of allergic respiratory complaints
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US2593377A (en) * 1946-05-15 1952-04-15 Research Corp Gas cleaning apparatus
US2593869A (en) * 1948-07-15 1952-04-22 Fruth Hal Frederick Air purification device
US2616165A (en) * 1947-01-18 1952-11-04 Everett D Mccurdy Electrode for electrolytic devices and methods of making same
US2908347A (en) * 1957-10-21 1959-10-13 Westinghouse Electric Corp Electrostatic precipitators
US2973054A (en) * 1956-02-15 1961-02-28 Philco Corp Gas cleaning unit
GB931625A (en) * 1961-02-24 1963-07-17 Engelhard Hanovia Inc Improvements in or relating to electrostatic precipitators
US3114877A (en) * 1956-10-30 1963-12-17 Gen Electric Particle detector having improved unipolar charging structure
US3128378A (en) * 1960-10-04 1964-04-07 Dynamics Corp America Negative ion generator using an ultraviolet source to irradiate electrically conductive material
US3403252A (en) * 1960-02-29 1968-09-24 Westinghouse Electric Corp Air processing apparatus and ion generator comprising an electromagnetic radiation source and a stable electron emitting photosensitive member

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1381660A (en) * 1918-10-31 1921-06-14 Rathbun Ross Buxton Method of removing solids suspended in moving gases
US1931436A (en) * 1930-11-03 1933-10-17 Int Precipitation Co Electrical precipitating apparatus
US2067822A (en) * 1936-04-11 1937-01-12 Joseph B Biederman Mask for the prevention and relief of allergic respiratory complaints
US2593377A (en) * 1946-05-15 1952-04-15 Research Corp Gas cleaning apparatus
US2616165A (en) * 1947-01-18 1952-11-04 Everett D Mccurdy Electrode for electrolytic devices and methods of making same
US2593869A (en) * 1948-07-15 1952-04-22 Fruth Hal Frederick Air purification device
US2579441A (en) * 1950-02-25 1951-12-18 Westinghouse Electric Corp Electrostatic precipitator
US2973054A (en) * 1956-02-15 1961-02-28 Philco Corp Gas cleaning unit
US3114877A (en) * 1956-10-30 1963-12-17 Gen Electric Particle detector having improved unipolar charging structure
US2908347A (en) * 1957-10-21 1959-10-13 Westinghouse Electric Corp Electrostatic precipitators
US3403252A (en) * 1960-02-29 1968-09-24 Westinghouse Electric Corp Air processing apparatus and ion generator comprising an electromagnetic radiation source and a stable electron emitting photosensitive member
US3128378A (en) * 1960-10-04 1964-04-07 Dynamics Corp America Negative ion generator using an ultraviolet source to irradiate electrically conductive material
GB931625A (en) * 1961-02-24 1963-07-17 Engelhard Hanovia Inc Improvements in or relating to electrostatic precipitators

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3918939A (en) * 1973-08-31 1975-11-11 Metallgesellschaft Ag Electrostatic precipitator composed of synthetic resin material
DE2721528A1 (de) * 1977-05-12 1978-11-16 Manfred R Burger Verfahren und vorrichtung zur reinigung von gasen
FR2390209A1 (fr) * 1977-05-12 1978-12-08 Burger Manfred Procede et dispositif de filtration electrostatique pour l'epuration de gaz
US4344776A (en) * 1979-06-27 1982-08-17 Amcor Ltd. Electrostatic air filter
US4382866A (en) * 1980-12-09 1983-05-10 Johnson Dennis E J Electro-chemical system for liquid filtration
US4491551A (en) * 1981-12-02 1985-01-01 Johnson Dennis E J Method and device for in-line mass dispersion transfer of a gas flow into a liquid flow
US4555252A (en) * 1983-06-04 1985-11-26 Dragerwerk Aktiengesellschaft Electrostatic filter construction
US4666478A (en) * 1984-10-17 1987-05-19 E.F.C. Control Inc. Scrubber apparatus for purifying foul air produced during an embalming, an autopsy or the like
US4662903A (en) * 1986-06-02 1987-05-05 Denki Kogyo Company Limited Electrostatic dust collector
US4969328A (en) * 1986-10-21 1990-11-13 Kammel Refaat A Diesel engine exhaust oxidizer
US4940470A (en) * 1988-03-23 1990-07-10 American Filtrona Corporation Single field ionizing electrically stimulated filter
US5097665A (en) * 1988-11-01 1992-03-24 Kammel Refaat A Flattened profile diesel engine exhaust oxidizer
USRE34549E (en) * 1989-07-24 1994-02-22 Sun; Shin-Ching Purifying air conditioner
US5009683A (en) * 1989-07-24 1991-04-23 Sun Shin Ching Purifying air conditioner
US5330722A (en) * 1991-02-27 1994-07-19 William E. Pick Germicidal air filter
WO1993023171A1 (fr) * 1992-05-13 1993-11-25 Elena Vladimirovna Volodina Dispositif de nettoyage et de filtrage biologique d'air
US5474600A (en) * 1992-05-13 1995-12-12 Volodina; Elena V. Apparatus for biological purification and filtration of air
US5330559A (en) * 1992-08-11 1994-07-19 United Air Specialists, Inc. Method and apparatus for electrostatically cleaning particulates from air
US5474599A (en) * 1992-08-11 1995-12-12 United Air Specialists, Inc. Apparatus for electrostatically cleaning particulates from air
US5681374A (en) * 1993-06-18 1997-10-28 Freshman Ab Device for the separation of microscopic particles out of air
US5476538A (en) * 1993-07-13 1995-12-19 Japan Atomic Energy Research Institute Method of removing aerosols by the radiation effect
US5582632A (en) * 1994-05-11 1996-12-10 Kimberly-Clark Corporation Corona-assisted electrostatic filtration apparatus and method
US5716431A (en) * 1994-06-07 1998-02-10 Freshman Ab Device for separating extremely fine particles from air
US6019815A (en) * 1997-01-06 2000-02-01 Carrier Corporation Method for preventing microbial growth in an electronic air cleaner
US6149717A (en) * 1997-01-06 2000-11-21 Carrier Corporation Electronic air cleaner with germicidal lamp
US5837207A (en) * 1997-04-17 1998-11-17 Engineering Dynamics Limited Portable germicidal air filter
US5938823A (en) * 1997-04-18 1999-08-17 Carrier Corporation Integrated electrostatic collection and microwave sterilization for bioaerosol air purification
US6162285A (en) * 1997-05-08 2000-12-19 Applied Materials, Inc. Ozone enhancement unit
EP0994752A4 (en) * 1997-07-14 2001-03-07 Yujiro Yamamoto FILTER SYSTEM COMPRISING INDUCED VOLTAGE ELECTRODES AS WELL AS A DISPOSABLE CASE
US6221314B1 (en) 1997-11-04 2001-04-24 Wil Bigelow Air actinism chamber apparatus and method
US5968215A (en) * 1998-01-20 1999-10-19 Dana Corporation Combined inlet outlet air filter element
US6228327B1 (en) 1998-07-09 2001-05-08 Molecucare, Inc. Apparatus and method for simultaneously germicidally cleansing air and water
US6022511A (en) * 1998-07-09 2000-02-08 Molecucare, Inc. Apparatus and method for germicidally cleaning air in a duct system
US6228149B1 (en) 1999-01-20 2001-05-08 Patterson Technique, Inc. Method and apparatus for moving, filtering and ionizing air
US6500387B1 (en) 2000-05-19 2002-12-31 Nukuest, Inc. Air actinism chamber apparatus and method
US20030021721A1 (en) * 2002-07-16 2003-01-30 Microgenix Limited Purification of air
US20060272504A1 (en) * 2003-04-30 2006-12-07 Mikael Nutsos Conducting gas purification filter and filter assembly
WO2004096413A1 (en) 2003-04-30 2004-11-11 Mikael Nutsos Conducting gas purification filter and filter assembly
US7594959B2 (en) 2003-04-30 2009-09-29 Mikael Nutsos Conducting gas purification filter and filter assembly
US20100024653A1 (en) * 2003-04-30 2010-02-04 Mikael Nutsos Conducting air filter and filter assembly
US8323385B2 (en) 2003-04-30 2012-12-04 Mikael Nutsos Conducting air filter and filter assembly
US7175814B2 (en) 2003-06-16 2007-02-13 Dionisio James L Air disinfecting system and cartridge device containing ultraviolet light
US20060263272A1 (en) * 2003-06-16 2006-11-23 Dionisio James L Cartridge device containing uvc for air disinfection. "uvbio-clean"
US20050287051A1 (en) * 2004-06-23 2005-12-29 Yuen John S Photo-electronic air purifying and conditioning system
US7264657B2 (en) * 2004-06-23 2007-09-04 John Manufacturing Limited Photo-electronic air conditioning, dehumidifying, purifying and disinfecting system
US7270696B2 (en) * 2004-06-23 2007-09-18 John Manufacturing Limited Photo-electronic air purifying and disinfecting system
US7273515B2 (en) * 2004-06-23 2007-09-25 John Manufacturing Limited Photo-electronic air purifying and conditioning system
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IT942698B (it) 1973-04-02
GB1379738A (en) 1975-01-08
FR2115827A5 (enExample) 1972-07-07

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