WO2001000525A1 - Corona discharge ozone generator with insulator-coated conductors - Google Patents

Corona discharge ozone generator with insulator-coated conductors Download PDF

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Publication number
WO2001000525A1
WO2001000525A1 PCT/US2000/017970 US0017970W WO0100525A1 WO 2001000525 A1 WO2001000525 A1 WO 2001000525A1 US 0017970 W US0017970 W US 0017970W WO 0100525 A1 WO0100525 A1 WO 0100525A1
Authority
WO
WIPO (PCT)
Prior art keywords
corona discharge
ozone generator
conductive core
discharge ozone
wound conductor
Prior art date
Application number
PCT/US2000/017970
Other languages
French (fr)
Inventor
David Buddingh
Larry Klesman
Original Assignee
Otres, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Otres, Inc. filed Critical Otres, Inc.
Priority to AU60588/00A priority Critical patent/AU6058800A/en
Publication of WO2001000525A1 publication Critical patent/WO2001000525A1/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/10Preparation of ozone
    • C01B13/11Preparation of ozone by electric discharge
    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46BBRUSHES
    • A46B17/00Accessories for brushes
    • A46B17/06Devices for cleaning brushes after use
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00Preparation of ozone by electrical discharge
    • C01B2201/10Dischargers used for production of ozone
    • C01B2201/14Concentric/tubular dischargers
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00Preparation of ozone by electrical discharge
    • C01B2201/20Electrodes used for obtaining electrical discharge
    • C01B2201/22Constructional details of the electrodes
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00Preparation of ozone by electrical discharge
    • C01B2201/30Dielectrics used in the electrical dischargers
    • C01B2201/32Constructional details of the dielectrics
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00Preparation of ozone by electrical discharge
    • C01B2201/30Dielectrics used in the electrical dischargers
    • C01B2201/34Composition of the dielectrics
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/78Treatment of water, waste water, or sewage by oxidation with ozone

Definitions

  • the present invention relates to a method and apparatus for generating ozone by corona discharge, and more particularly to a corona discharge ozone generator having an insulator-coated conductive core and wound conductor associated with the conductive core.
  • Ozone (0 3 ) also known as "Activated Oxygen”
  • Activated Oxygen is an unstable gas which easily degrades to oxygen gas in the presence of heat or water.
  • the production of ozone can be required for several applications, such as the treatment of drinking water or the sterilization of goods.
  • One of the major benefits of ozone is that it can kill microbes such as bacteria, germs, or viruses without the use of toxic materials.
  • Ozone is used in over 200 cities and over 3,000 state-of-the-art municipal water- treatment systems around the world. In fact, in 1991, the Environmental Protection Agency designated activated oxygen as the most effective primary disinfectant available for drinking water.
  • Ozone is created commercially through the use of ultraviolet light or by a corona discharge apparatus. Both of these processes are well known in the art.
  • a corona discharge apparatus consists of two electrodes connected to opposing ends of an electrical transformer, and a dielectric material placed in between the electrodes. Oxygen-containing gas, such as pure oxygen gas (0 2 ) or air, is then passed between the electrodes, creating a corona discharge.
  • the corona discharge splits the natural oxygen molecule into separate, highly active atoms. Some of these atoms combine with the nearest oxygen molecule, thereby forming ozone. Once formed, ozone, which is also unstable, seeks equilibrium by reacting with other surrounding molecules.
  • a corona discharge apparatus consists of two electrodes that are electrically connected to a transformer.
  • copper wire the most frequently used methods of connecting items electrically is through the use of copper wire.
  • copper cheap and abundant, but it is a good conductor of electricity, has a high melting point, and does not creep at connections. Copper is naturally compatible with itself, but is not compatible with aluminum or silver wires. Since circuit boards often utilize copper, the most effective method of electrically connecting the electrodes to the circuit board, and hence the transformer, is to use copper wire.
  • both the conducting core and the wound conductor are made of copper.
  • both the conducting core and the wire attaching the conducting core to the transformer are insulated with a material impervious to ozone, such as polytetrafluoroethylene. Although the insulating material slightly lowers the strength at which the electric field passes between the electrodes, the insulating material does not prevent the electric field from passing between the electrodes and dielectric materials.
  • the use of an insulator allows the copper to be soldered directly to the circuit board and prevents the build-up of copper sulfate, thereby reducing corrosion. Furthermore, the use of insulation increases the safety of the apparatus since a user can touch the corona cell without being shocked or burnt.
  • FIG. 1 is a schematic view of an embodiment of the present invention
  • FIG. 2 is a lateral view of the corona cell illustrated in Fig. 1 ;
  • FIGS. 3 and 4 are alternate embodiments of the corona cell shown in Fig. 2. Detailed Description Of Preferred Embodiment (s )
  • FIGS. 1-4 illustrate a corona discharge ozone generator according to the present invention.
  • the corona discharge apparatus 10 of Fig. 1 includes a corona cell 12, a circuit board 14, an electrical transformer 16, and wiring 18 and 20 attaching the corona cell 12 to the circuit board 14.
  • the wiring 18 and 20 is soldered to the circuit board 14.
  • Energy entering from an outside source, such as a household electrical socket (not shown) is converted by the transformer 16 and passed through electrical connections 13 on the circuit board 14 for use by the corona discharge apparatus 10.
  • the electrical connections 13 are made of copper.
  • the corona cell 12 has two electrodes, the conducting cell 22 and the wound conductor 24.
  • the conducting cell 22 is a ten (10) gauge copper wire, while the wound conductor 24 is a twenty-two (22) gauge copper wire.
  • the wound conductor 24 is simply an extension of wiring 20 and is wrapped around the conducting cell 22.
  • These electrodes are separated by a dielectric material 26.
  • an electric field (not shown) travels between conducting cell 22 and wound conductor 24, and through the dielectric material 26.
  • Oxygen-containing gas such as pure oxygen gas (0 ) or air, is then passed between the conducting cell 22 and the wound conductor 24, creating a corona discharge.
  • the corona discharge splits the diatomic oxygen gas molecule into separate, highly active atoms. Given the instability of each oxygen atom, it immediately seeks equilibrium by combining with another oxygen atom(s) . Some of these atoms combine with the nearest diatomic oxygen molecule, thereby forming ozone.
  • an embodiment of the present invention has a cylindrical conducting cell 22 enclosed by a similarly shaped dielectric material 26.
  • the wound conductor 24 follows the contour of the conducting cell 22.
  • FIG. 3 An alternate embodiment of the present invention is shown in FIG. 3.
  • the conductor cell 22 has a polygonal cross section. As the wound conductor 24 loops around the conductor cell 22, air gaps 30 form in between the lateral sides 32 of the conductor cell 22 and the wound conductor 24. This configuration increases the amount of air that comes into contact with the corona discharge zone, thereby increasing the amount of ozone produced.
  • an insulating material 34 around one of the electrodes.
  • the conducting core 22 and wiring 18 are surrounded by an insulating material 34 that is impervious to ozone, such as polytetrafluoroethylene.
  • the electrical connections 13 of the preferred embodiment are made of copper. Since copper is naturally compatible with itself, but is not compatible with aluminum or silver wires, it is beneficial to use copper for the wiring 18 and 20.
  • the insulating material 34 is made of copper. Since copper is naturally compatible with itself, but is not compatible with aluminum or silver wires, it is beneficial to use copper for the wiring 18 and 20.
  • a gel form of the insulating material 34 mainly polytetrafluoroethylene, is applied to fill in any air gaps around the conducting core 22 and wiring 18. Then a second layer, this time as a shrink wrap, is applied over the first layer, substantially sealing the exposed copper of both the conducting core 22 and the wiring 18.
  • This insulating material 34 prevents the ozone from reacting with the copper surfaces to produce copper sulfate, which can corrode or destroy the copper surfaces. Furthermore, the production of ozone around the conducting core 22 results in the output of large amounts of heat. However, the use of the insulating material 34 prevents the escape of this heat into the surrounding environment. Since this corona discharge apparatus 10 may be used in homes, the insulating material 34 can prevent the user, be it an adult or child, from being burnt if he or she comes in contact with the corona cell 12.
  • the use of the insulating material may weaken the electric field that passes between the conducting core 22 and the wound conductor 24, the electric field remains sufficient for the production of ozone for sterilization.
  • the use of a polygonal cross-sectioned conducting core 22, as described above can increase the strength of the electric field enough to offset the loss caused by the insulating material 34.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)

Abstract

An ozone generator having first and second electrodes separated by a dielectric material and connected to opposite ends of an electric transformer. The ozone generator operates to produce a corona discharge in the vicinity of the electrodes, thereby facilitating the production of ozone when oxygen is present. The present invention also provides an insulative material, such as polytetrafluoroethylene, which is located around one of the two electrodes, preferably the conducting core. This insulating material permits the passage of an electric field while remaining impervious to ozone, thereby allowing for the use of copper wire, which may be easily soldered to a circuit board without the threat of copper sulfate build-up.

Description

CORONA DISCHARGE OZONE GENERATOR WITH INSULATOR-COATED CONDUCTORS
Cross-Reference to Related Applications
This application relates to and claims priority benefits from U.S. Provisional Patent Application Serial Nos. 60/141,646 filed June 29, 1999 and 60/179,211 filed January 31, 2000, each of which is incorporated by reference herein in its entirety.
Field of the Invention
The present invention relates to a method and apparatus for generating ozone by corona discharge, and more particularly to a corona discharge ozone generator having an insulator-coated conductive core and wound conductor associated with the conductive core.
Background of the Invention
Ozone (03) , also known as "Activated Oxygen," is an unstable gas which easily degrades to oxygen gas in the presence of heat or water. The production of ozone can be required for several applications, such as the treatment of drinking water or the sterilization of goods. One of the major benefits of ozone is that it can kill microbes such as bacteria, germs, or viruses without the use of toxic materials. Ozone is used in over 200 cities and over 3,000 state-of-the-art municipal water- treatment systems around the world. In fact, in 1991, the Environmental Protection Agency designated activated oxygen as the most effective primary disinfectant available for drinking water.
Ozone is created commercially through the use of ultraviolet light or by a corona discharge apparatus. Both of these processes are well known in the art. A corona discharge apparatus consists of two electrodes connected to opposing ends of an electrical transformer, and a dielectric material placed in between the electrodes. Oxygen-containing gas, such as pure oxygen gas (02) or air, is then passed between the electrodes, creating a corona discharge.
The corona discharge splits the natural oxygen molecule into separate, highly active atoms. Some of these atoms combine with the nearest oxygen molecule, thereby forming ozone. Once formed, ozone, which is also unstable, seeks equilibrium by reacting with other surrounding molecules.
As mentioned, a corona discharge apparatus consists of two electrodes that are electrically connected to a transformer. Among the most frequently used methods of connecting items electrically is through the use of copper wire. Not only is copper cheap and abundant, but it is a good conductor of electricity, has a high melting point, and does not creep at connections. Copper is naturally compatible with itself, but is not compatible with aluminum or silver wires. Since circuit boards often utilize copper, the most effective method of electrically connecting the electrodes to the circuit board, and hence the transformer, is to use copper wire.
With that said however, prior art corona discharge apparatuses have not used copper wire because ozone reacts with the exposed copper to create copper sulfate. Since the build-up of copper sulfate corrodes, and eventually destroys, the copper wire, corona discharge apparatuses have used either aluminum or silver wiring. Thus, there has been a long felt need for a corona discharge apparatus that produces ozone that facilitates the use of copper wiring. Brief Summary of The Invention
The preferred embodiments of the present invention address these needs and other concerns . In the preferred embodiment of the present invention, both the conducting core and the wound conductor are made of copper.
Likewise, copper wire is used to attach the electrodes to the circuit board, and hence, the transformer. Both the conducting core and the wire attaching the conducting core to the transformer are insulated with a material impervious to ozone, such as polytetrafluoroethylene. Although the insulating material slightly lowers the strength at which the electric field passes between the electrodes, the insulating material does not prevent the electric field from passing between the electrodes and dielectric materials.
In return, the use of an insulator allows the copper to be soldered directly to the circuit board and prevents the build-up of copper sulfate, thereby reducing corrosion. Furthermore, the use of insulation increases the safety of the apparatus since a user can touch the corona cell without being shocked or burnt.
These and other features of the present invention are discussed in the following detailed description of the preferred embodiments of the present invention.
Brief Description of The Drawings
FIG. 1 is a schematic view of an embodiment of the present invention;
FIG. 2 is a lateral view of the corona cell illustrated in Fig. 1 ;
FIGS. 3 and 4 are alternate embodiments of the corona cell shown in Fig. 2. Detailed Description Of Preferred Embodiment (s )
FIGS. 1-4 illustrate a corona discharge ozone generator according to the present invention. The corona discharge apparatus 10 of Fig. 1 includes a corona cell 12, a circuit board 14, an electrical transformer 16, and wiring 18 and 20 attaching the corona cell 12 to the circuit board 14. The wiring 18 and 20 is soldered to the circuit board 14. Energy entering from an outside source, such as a household electrical socket (not shown) is converted by the transformer 16 and passed through electrical connections 13 on the circuit board 14 for use by the corona discharge apparatus 10. In the preferred embodiment of the present invention, the electrical connections 13 are made of copper. The corona cell 12 has two electrodes, the conducting cell 22 and the wound conductor 24. In the preferred embodiment, the conducting cell 22 is a ten (10) gauge copper wire, while the wound conductor 24 is a twenty-two (22) gauge copper wire. The wound conductor 24 is simply an extension of wiring 20 and is wrapped around the conducting cell 22. These electrodes are separated by a dielectric material 26. During ozone production, an electric field (not shown) travels between conducting cell 22 and wound conductor 24, and through the dielectric material 26. Oxygen-containing gas, such as pure oxygen gas (0 ) or air, is then passed between the conducting cell 22 and the wound conductor 24, creating a corona discharge.
The corona discharge splits the diatomic oxygen gas molecule into separate, highly active atoms. Given the instability of each oxygen atom, it immediately seeks equilibrium by combining with another oxygen atom(s) . Some of these atoms combine with the nearest diatomic oxygen molecule, thereby forming ozone.
In order for ozone to be produced, the electric field between the conducting cell 22 and the wound conductor 24 must "excite" an oxygen molecule. Thus, to provide the most efficient process for producing ozone, the process must bring as many oxygen molecules into contact with the corona discharge zone. As shown in FIG. 2, an embodiment of the present invention has a cylindrical conducting cell 22 enclosed by a similarly shaped dielectric material 26. The wound conductor 24 follows the contour of the conducting cell 22. An alternate embodiment of the present invention is shown in FIG. 3. In this embodiment, the conductor cell 22 has a polygonal cross section. As the wound conductor 24 loops around the conductor cell 22, air gaps 30 form in between the lateral sides 32 of the conductor cell 22 and the wound conductor 24. This configuration increases the amount of air that comes into contact with the corona discharge zone, thereby increasing the amount of ozone produced.
Another benefit of the present invention is the addition of an insulating material 34 around one of the electrodes. As illustrated in FIG. 4, the conducting core 22 and wiring 18 are surrounded by an insulating material 34 that is impervious to ozone, such as polytetrafluoroethylene. As mentioned above, the electrical connections 13 of the preferred embodiment are made of copper. Since copper is naturally compatible with itself, but is not compatible with aluminum or silver wires, it is beneficial to use copper for the wiring 18 and 20. In the preferred embodiment, the insulating material
34 is applied to the conducting core 22 and wiring 18 in a two step process. First a gel form of the insulating material 34, mainly polytetrafluoroethylene, is applied to fill in any air gaps around the conducting core 22 and wiring 18. Then a second layer, this time as a shrink wrap, is applied over the first layer, substantially sealing the exposed copper of both the conducting core 22 and the wiring 18.
This insulating material 34 prevents the ozone from reacting with the copper surfaces to produce copper sulfate, which can corrode or destroy the copper surfaces. Furthermore, the production of ozone around the conducting core 22 results in the output of large amounts of heat. However, the use of the insulating material 34 prevents the escape of this heat into the surrounding environment. Since this corona discharge apparatus 10 may be used in homes, the insulating material 34 can prevent the user, be it an adult or child, from being burnt if he or she comes in contact with the corona cell 12.
Although the use of the insulating material may weaken the electric field that passes between the conducting core 22 and the wound conductor 24, the electric field remains sufficient for the production of ozone for sterilization. Furthermore, the use of a polygonal cross-sectioned conducting core 22, as described above, can increase the strength of the electric field enough to offset the loss caused by the insulating material 34. While particular elements, embodiments and applications of the present invention have been shown and described, it will be understood, of course, that the invention is not limited thereto since modifications may be made by those skilled in the art, particularly in light of the foregoing teachings. It is therefore contemplated by the appended claims to cover such modifications that incorporate those features coming within the scope of the invention.

Claims

What is claimed is :
1. A corona discharge ozone generator comprising:
(a) a conductive core;
(b) a wound conductor associated with said conductive core;
(c) at least one dielectric material disposed between said conductive core and said wound conductor;
(d) at least one of said conductive core or said wound conductor insulated with a material impervious to ozone; and
(e) said conductive core and said wound conductor electrically connected to opposite ends of an electrical transformer.
2. The corona discharge ozone generator of claim 1 wherein said conductive core is made of a metallic material .
3. The corona discharge ozone generator of claim 2 wherein said conductive core is made of copper.
4. The corona discharge ozone generator of claim 1 wherein said insulative material is polytetrafluoroethylene.
5. The corona discharge ozone generator of claim 1 wherein said conductor core is cylindrical.
6. The corona discharge ozone generator of claim 1 wherein said conductor core is polygonal in cross- section.
7. The corona discharge ozone generator of claim 1 wherein said dielectric material is in contact with the conductive core or wound conductor.
8. The corona discharge ozone generator of claim 1 wherein said dielectric material is in contact with both the conductive core and the wound conductor.
9. The corona discharge ozone generator of claim 1 further comprising multiple dielectric materials.
10. The corona discharge ozone generator of claim 9 wherein one of said dielectric materials is air.
11. The corona discharge ozone generator of claim 1 wherein said both the conductive core and wound core are insulated.
12. A corona discharge ozone generator comprising:
(a) a metallic conductive core insulated with polytetrafluoroethylene;
(b) a wound conductor associated with said conductive core;
(c) at least one dielectric material disposed between said conductive core and said wound conductor; and
(d) said conductive core and said wound conductor electrically connected to opposite ends of an electrical transformer.
13. The corona discharge ozone generator of claim
12 wherein said conductive core is made of copper.
14. A corona discharge ozone generator comprising: (a) a conductive core, said conductive core having a polygonal cross section;
(b) a wound conductor associated with said conductive core;
(c) at least one dielectric material disposed between said conductive core and said wound conductor; and
(d) said conductive core and said wound conductor electrically connected to opposite ends of an electrical transformer.
PCT/US2000/017970 1999-06-29 2000-06-29 Corona discharge ozone generator with insulator-coated conductors WO2001000525A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60588/00A AU6058800A (en) 1999-06-29 2000-06-29 Corona discharge ozone generator with insulator-coated conductors

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US60/141,646 1999-06-29
US17921100P 2000-01-31 2000-01-31
US60/179,211 2000-01-31
US14164600P 2000-06-29 2000-06-29

Publications (1)

Publication Number Publication Date
WO2001000525A1 true WO2001000525A1 (en) 2001-01-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236497A2 (en) * 2001-03-02 2002-09-04 Yukio Kinoshita Exhaust gas processing system
WO2014005292A1 (en) * 2012-07-03 2014-01-09 Zhao Bing Ozone generating pipe
IT201900024661A1 (en) * 2019-12-19 2021-06-19 Ecoglobal Italia Srls DEVICE FOR STERILIZATION AND SANITIZATION FOR ENVIRONMENTS
IT202100004223A1 (en) * 2021-02-23 2022-08-23 Innovation Green Tech S R L DISINFECTION SYSTEM FOR SWIMMING POOLS

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5767005A (en) * 1980-10-09 1982-04-23 Tsuneyoshi Ohashi Silent discharger for generating ozone
JPS6317208A (en) * 1986-07-10 1988-01-25 Toshiki Matsuki Ozone generator
US5545379A (en) * 1993-02-05 1996-08-13 Teledyne Industries, Inc. Corona discharge system with insulated wire
JPH0959004A (en) * 1995-08-21 1997-03-04 Murayama Denki Seisakusho:Kk Electrode for generation of ozone
JPH10120404A (en) * 1996-10-16 1998-05-12 Kanki:Kk Simple ozone generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5767005A (en) * 1980-10-09 1982-04-23 Tsuneyoshi Ohashi Silent discharger for generating ozone
JPS6317208A (en) * 1986-07-10 1988-01-25 Toshiki Matsuki Ozone generator
US5545379A (en) * 1993-02-05 1996-08-13 Teledyne Industries, Inc. Corona discharge system with insulated wire
JPH0959004A (en) * 1995-08-21 1997-03-04 Murayama Denki Seisakusho:Kk Electrode for generation of ozone
JPH10120404A (en) * 1996-10-16 1998-05-12 Kanki:Kk Simple ozone generator

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section Ch Week 199719, Derwent World Patents Index; Class E36, AN 1997-209097, XP002151275 *
PATENT ABSTRACTS OF JAPAN vol. 006, no. 143 (C - 117) 3 August 1982 (1982-08-03) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 219 (C - 506) 22 June 1988 (1988-06-22) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 10 31 August 1998 (1998-08-31) *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1236497A2 (en) * 2001-03-02 2002-09-04 Yukio Kinoshita Exhaust gas processing system
EP1236497A3 (en) * 2001-03-02 2003-04-02 Yukio Kinoshita Exhaust gas processing system
KR100875882B1 (en) * 2001-03-02 2008-12-24 유키오 기노시타 Exhaust gas treatment system
WO2014005292A1 (en) * 2012-07-03 2014-01-09 Zhao Bing Ozone generating pipe
IT201900024661A1 (en) * 2019-12-19 2021-06-19 Ecoglobal Italia Srls DEVICE FOR STERILIZATION AND SANITIZATION FOR ENVIRONMENTS
IT202100004223A1 (en) * 2021-02-23 2022-08-23 Innovation Green Tech S R L DISINFECTION SYSTEM FOR SWIMMING POOLS

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