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WO2002074409A1 - A filter system - Google Patents

A filter system Download PDF

Info

Publication number
WO2002074409A1
WO2002074409A1 PCT/DK2002/000178 DK0200178W WO02074409A1 WO 2002074409 A1 WO2002074409 A1 WO 2002074409A1 DK 0200178 W DK0200178 W DK 0200178W WO 02074409 A1 WO02074409 A1 WO 02074409A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
flanges
filter system
modules
filter modules
Prior art date
Application number
PCT/DK2002/000178
Other languages
French (fr)
Inventor
Flemming Christiansen
Original Assignee
Heco Filtration A/S
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 Heco Filtration A/S filed Critical Heco Filtration A/S
Publication of WO2002074409A1 publication Critical patent/WO2002074409A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/15—Supported filter elements arranged for inward flow filtration
    • B01D29/21—Supported filter elements arranged for inward flow filtration with corrugated, folded or wound sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B01D29/54—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection arranged concentrically or coaxially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30—Filter housing constructions
    • B01D35/31—Filter housing constructions including arrangements for environmental protection, e.g. pressure resisting features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0002—Casings; Housings; Frame constructions
    • B01D46/0005—Mounting of filtering elements within casings, housings or frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B01D46/2414—End caps including additional functions or special forms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
    • B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/40—Special measures for connecting different parts of the filter

Definitions

  • the invention relates to a system for the cleaning of gaseous or liquid media, said filter system being formed by at least two filter modules which are assembled in the longitudinal direction of the filter modules.
  • the filter systems which are typically used today for the cleaning of media, such as the lubricating oil in engines driving e.g. electric generators on ships, are manufactured as an integrated unit, where the active filter me- dium is encapsulated in a protective steel jacket which simply cannot be separated from the filter medium.
  • an object of the invention is to manufacture a filter system where all the metallic parts may be used again, and where the active filter module, which is to be exchanged at intervals, may be separated from the rest of the filter system in a simple manner.
  • a filter system of the type defined in the introductory portion of claim 1 which is characterized in that the filter modules have flanges at each end which are constructed such that an end flange from one module may engage an end flange on another module, and that the filter modules are clamped together at their outer ends with two outer flanges, said outer flanges being adapted to engage the flanges of the outer filter modules.
  • the filter modules may be released from the rest of the filter system merely by loosening the outer flanges.
  • a particularly expedient way of loosening the outer flanges from the rest of the filter system is advantageously carried out in that, as stated in claim 2, the clamping is established with a central through shaft which extends through the outer flanges, and that the central shaft has clamping means at its ends.
  • the clamping is carried out as stated in claim 3, more particularly in that the end flange at one end of a filter module is formed by a truncated cone provided at the outer side of the filter module or as a wall having a slightly inwardly inclined outer side, while the end flange at the other end at the outer side is formed as a circular wall, and so that the outer side of the truncated cone or the wall may engage the inner side of the cir- cular wall.
  • a press fit is provided, ensuring a good and sufficient seal between the filter modules.
  • the filter modules are enclosed by a perforated outer protective jacket in the form of a steel pipe, it is ensured that the filter modules do not collapse in use when their outer sides are subject to great pressures.
  • a perforated inner protective jacket in the form of a steel pipe is provided along the inner side of the filter modules, and, as stated in claim 7, a steel net is arranged along the inner side of the inner protective jacket, said net having a mesh size which allows larger particles to pass than the filter modules allow, as the inner protective jacket will stiffen the filter modules, while the filter steel net will serve as a safety filter if one or more of the filter modules should collapse.
  • the filter modules are made of combustible materials, where the end flanges are made of a plastics material, such as polyamide or teflon, it is possible to incinerate the filter modules in waste combustion furnaces, such as e.g. the so-called incinerators which are frequently provided on modern ships.
  • filter systems composed of filter modules according to the present invention are easy to handle, environmentally acceptable and also economically advantageous for the users, who also avoid having to pay for the disposal of the worn filters.
  • fig. 1 shows a filter system having filter modules according to the invention, partly in section,
  • fig. 2 shows two filter modules in perspective
  • fig. 3 shows components incorporated in the assembly of a filter system according to the invention.
  • a filter system according to the invention is generally designated 1.
  • the filter system consists of three filter modules, two of which are designated 2.
  • the filter modules may also be composed of a pleated paper material which is terminated by end flanges, cf. also fig. 2, as will be explained later.
  • three filter modules are assembled in fig. 3 in that adjacent flanges are clamped together by means of a central through shaft 9, which has a nut 7, 8 at its ends which may be clamped against two outer flanges
  • An inner protective pipe is arranged along the inner side of the filter modules 2, and this protective pipe, too, may be constructed as a perforated steel pipe on whose inner side a steel net may be arranged, having a mesh size that allows larger particles to pass than the pleated paper of the filter modules allows.
  • a hole 4 is provided at one of the outer flanges 15, while a safety valve (not shown) is arranged in the other outer flange.
  • the medium to be cleaned is transported in the direction of the arrow 3 inwards toward the filter modules 2 where the pleated paper ensures that impurities of a certain particle size do not pass.
  • the cleaned medium passes through the inner protective pipe and leaves the filter system through the shown hole 4 in the one outer flange 15.
  • the filter system is separated in that the nuts 7, 8 are loosened, and the outer flange or both outer flanges are removed, following which the filter modules are replaced by new ones.
  • the used modules which are made of combustible materials, are sent to a combustion facility in which the filters with impurities are incinerated in an environmentally acceptable way.
  • end flanges of the modules are constructed such that an end flange of a module may be pushed together with another end flange of another module.
  • a frustoconical wall 11 which may engage a circular wall 11 provided in an adjacent filter module, and so that the inner diameter of the circular wall has a size which just allows the outer side of the frustoconical wall to be pressed against the inner side of the circular wall when the filter mod- ules are clamped together.
  • a frustoconical wall it is possible to provide a wall having an outer side inclined slightly inwards in a direction toward the centre of the filter module.
  • the end flanges, at their inner sides, of the filter modules are formed with a circular wall 12.
  • the interior of this circular wall forms part of a U-shaped recess which serves to attach the pleated paper of the filter module, e.g. using a hardening mass which is introduced into the U-shaped recess together with the pleated paper.
  • the circular walls at the end flanges do not adjoin each other completely after clamping, but form a gap 13 between them, so that no pressure can be generated in the cavity 16 which is defined by the inner and outer walls of the end flanges, with the consequent risk of leakages being created at the outer walls.
  • the filter arranged on the inner side of the inner protective pipe will absorb most of these impurities and be clogged shortly afterwards, so that it will quickly be detected that there is a defect in the filter system.
  • the safety valve (not shown) in the outer flange 14 will open if the hole 4 is closed for some reason, or, altogether, if there is an interruption of flow after the hole.
  • Fig. 3 shows the most important parts of the parts incorporated in the filter system according to the invention, in a disassembled state. These parts are a filter module 2, the outer protective pipe 6, the central shaft 9 with the outer flange 14 and the inner protective pipe 5.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

A filter system (1) for the cleaning of gaseous or liquid media is formed by a plurality of filter modules (2) which, at their ends, are formed with end flanges (10, 11, 12) which may engage each other and be clamped together by means of outer flanges (14, 15), which may engage the flanges of the outer filter modules, said clamping being established with a through shaft (9) which may receive a nut (7, 8) or the like at its ends. The end flanges (10, 11, 12) of a filter module are formed at one end as a truncated cone (10) which may engage the inner side of a circular wall (11) in an end flange of another filter module when they are clamped together as stated above.

Description

A filter system
The invention relates to a system for the cleaning of gaseous or liquid media, said filter system being formed by at least two filter modules which are assembled in the longitudinal direction of the filter modules.
The filter systems which are typically used today for the cleaning of media, such as the lubricating oil in engines driving e.g. electric generators on ships, are manufactured as an integrated unit, where the active filter me- dium is encapsulated in a protective steel jacket which simply cannot be separated from the filter medium.
When the filter medium is to be replaced after use, this therefore means that also the protective steel jacket has to be replaced.
Within the maritime transport business, it was previously so that, when worn, the filters for cleaning the engine lubricating oils were frequently thrown overboard when the ship was on the open sea. However, as a result of the internationally enhanced awareness of the environment several countries have now adopted regulations for the handling of the used filter units. Now, the standard is thus that filters are registered and may not be thrown overboard after use, but have to handed over to the regional environmental authorities for disposal. Normally, the ship owners are to pay the costs of the disposal of the exchanged filter units.
It is known from WO 99/64133 to manufacture filter systems which are composed of modules. These known filter modules are assembled using special coupling elements which add to the costs of the finished product and make exchange and assembly cumbersome and are relatively expen- sive to manufacture. Accordingly, an object of the invention is to manufacture a filter system where all the metallic parts may be used again, and where the active filter module, which is to be exchanged at intervals, may be separated from the rest of the filter system in a simple manner.
The object of the invention is achieved by a filter system of the type defined in the introductory portion of claim 1 , which is characterized in that the filter modules have flanges at each end which are constructed such that an end flange from one module may engage an end flange on another module, and that the filter modules are clamped together at their outer ends with two outer flanges, said outer flanges being adapted to engage the flanges of the outer filter modules.
Hereby, the filter modules may be released from the rest of the filter system merely by loosening the outer flanges.
A particularly expedient way of loosening the outer flanges from the rest of the filter system is advantageously carried out in that, as stated in claim 2, the clamping is established with a central through shaft which extends through the outer flanges, and that the central shaft has clamping means at its ends.
To ensure a sufficient seal between the filter modules after the clamping, it is an advantage if the clamping is carried out as stated in claim 3, more particularly in that the end flange at one end of a filter module is formed by a truncated cone provided at the outer side of the filter module or as a wall having a slightly inwardly inclined outer side, while the end flange at the other end at the outer side is formed as a circular wall, and so that the outer side of the truncated cone or the wall may engage the inner side of the cir- cular wall. Hereby, a press fit is provided, ensuring a good and sufficient seal between the filter modules.
When, as stated in claim 5, the filter modules are enclosed by a perforated outer protective jacket in the form of a steel pipe, it is ensured that the filter modules do not collapse in use when their outer sides are subject to great pressures.
Additionally, it is an advantage if, as stated in claim 6, a perforated inner protective jacket in the form of a steel pipe is provided along the inner side of the filter modules, and, as stated in claim 7, a steel net is arranged along the inner side of the inner protective jacket, said net having a mesh size which allows larger particles to pass than the filter modules allow, as the inner protective jacket will stiffen the filter modules, while the filter steel net will serve as a safety filter if one or more of the filter modules should collapse.
When, as stated in claim 8, the filter modules are made of combustible materials, where the end flanges are made of a plastics material, such as polyamide or teflon, it is possible to incinerate the filter modules in waste combustion furnaces, such as e.g. the so-called incinerators which are frequently provided on modern ships.
Thus, it is clear that filter systems composed of filter modules according to the present invention are easy to handle, environmentally acceptable and also economically advantageous for the users, who also avoid having to pay for the disposal of the worn filters.
Additional expedient embodiments of the invention are defined in claims 4 and 9. The invention will now be explained with reference to the embodiment shown in the drawing, in which
fig. 1 shows a filter system having filter modules according to the invention, partly in section,
fig. 2 shows two filter modules in perspective, while
fig. 3 shows components incorporated in the assembly of a filter system according to the invention.
In fig. 1 , a filter system according to the invention is generally designated 1. Here, the filter system consists of three filter modules, two of which are designated 2.
The filter modules may also be composed of a pleated paper material which is terminated by end flanges, cf. also fig. 2, as will be explained later.
As mentioned, three filter modules are assembled in fig. 3 in that adjacent flanges are clamped together by means of a central through shaft 9, which has a nut 7, 8 at its ends which may be clamped against two outer flanges
14, 15, which each engage end flanges of their respective filter modules 2.
A protective pipe 6, which may be a perforated steel pipe, is arranged along the outer side of the filter modules.
An inner protective pipe is arranged along the inner side of the filter modules 2, and this protective pipe, too, may be constructed as a perforated steel pipe on whose inner side a steel net may be arranged, having a mesh size that allows larger particles to pass than the pleated paper of the filter modules allows. A hole 4 is provided at one of the outer flanges 15, while a safety valve (not shown) is arranged in the other outer flange.
Before explaining more fully how the filter modules are composed, it will first be explained how the filter system operates in use.
The medium to be cleaned is transported in the direction of the arrow 3 inwards toward the filter modules 2 where the pleated paper ensures that impurities of a certain particle size do not pass.
The cleaned medium passes through the inner protective pipe and leaves the filter system through the shown hole 4 in the one outer flange 15.
When the filter module has been in operation for a given period, the filter system is separated in that the nuts 7, 8 are loosened, and the outer flange or both outer flanges are removed, following which the filter modules are replaced by new ones.
The used modules, which are made of combustible materials, are sent to a combustion facility in which the filters with impurities are incinerated in an environmentally acceptable way.
In the use of such a filter system it is extremely important that there is a good seal between the individual filter modules, so that the entire medium to be cleaned passes through the pleated paper of the filter modules and not through the adjacent flanges of the filter modules.
To ensure that there is a sufficiently tight connection between the end flanges of the modules, they are constructed such that an end flange of a module may be pushed together with another end flange of another module. This is done in that along the outer side of a filter module there is pro- vided a frustoconical wall 11 which may engage a circular wall 11 provided in an adjacent filter module, and so that the inner diameter of the circular wall has a size which just allows the outer side of the frustoconical wall to be pressed against the inner side of the circular wall when the filter mod- ules are clamped together. Instead of a frustoconical wall, it is possible to provide a wall having an outer side inclined slightly inwards in a direction toward the centre of the filter module.
Additionally, the end flanges, at their inner sides, of the filter modules are formed with a circular wall 12. The interior of this circular wall forms part of a U-shaped recess which serves to attach the pleated paper of the filter module, e.g. using a hardening mass which is introduced into the U-shaped recess together with the pleated paper.
In general, it is intended that the circular walls at the end flanges do not adjoin each other completely after clamping, but form a gap 13 between them, so that no pressure can be generated in the cavity 16 which is defined by the inner and outer walls of the end flanges, with the consequent risk of leakages being created at the outer walls.
In the event that a filter module gets inoperative for some reason and allows particles to pass, the filter arranged on the inner side of the inner protective pipe will absorb most of these impurities and be clogged shortly afterwards, so that it will quickly be detected that there is a defect in the filter system.
Also, the safety valve (not shown) in the outer flange 14 will open if the hole 4 is closed for some reason, or, altogether, if there is an interruption of flow after the hole.
Fig. 3 shows the most important parts of the parts incorporated in the filter system according to the invention, in a disassembled state. These parts are a filter module 2, the outer protective pipe 6, the central shaft 9 with the outer flange 14 and the inner protective pipe 5.

Claims

PATENT CLAIMS
1. A filter system (1) for the cleaning of gaseous or liquid media, said filter system being formed by at least two filter modules (2) which are assembled in the longitudinal direction of the filter modules, characterized in that the filter modules (2) have flanges (10, 11, 12, 13) at each end which are constructed such that an end flange from one module may engage an end flange on another module, and that the filter modules are clamped together at their outer ends with two outer flanges (14, 15), said outer flanges being adapted to engage the flanges of the outer filter modules.
2. A filter system according to claim 1, ch a racterized in that the clamping is established with a central through shaft (9) which extends through the end flanges (14, 15), and that the central shaft has clamping means (7, 8) at its ends.
3. A filter system according to claims 1 -2, characterized in that the end flange at one end of a filter module is formed by a truncated cone (10) provided at the outer side of the filter module or as a wall having a slightly inwardly inclined outer side, while the end flange at the other end at the outer side is formed as a circular wall (11 ), and so that the outer side of the truncated cone or the wall may engage the inner side of the circular wall.
4. A filter system according to claims 1 -3, characterized in that both end flanges in a filter module are additionally provided with a circular ring (2) at their inner side, said circular ring being dimensioned such that a small gap (13) exists between the circular rings after the clamping together of the filter modules.
5. A filter system according to claims 1 -4, characterized in that the filter modules (2) are enclosed by a perforated outer protective jacket (6) in the form of a steel pipe.
6. A filter system according to claims 1 -5, characterized in that a perforated inner protective jacket (5) in the form of a steel pipe is provided along the inner side of the filter modules.
7. A filter system according to claim 6, characterized in that a steel net is arranged along the inner side of the inner protective jacket, said net having a mesh size which allows larger particles to pass than the filter modules allow.
8. A filter system according to claims 1 -7, characterized in that the filter modules are made of combustible materials, where the end flanges of made of a plastics material, such as polyamide or teflon.
9. A filter system according to claims 1 -8, characterized in that the outer flange (15) is formed with holes (14) for the passage of the medium to be filtered, while a safety valve is provided in the other outer flange (14).
PCT/DK2002/000178 2001-03-21 2002-03-18 A filter system WO2002074409A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200100463 2001-03-21
DKPA200100463 2001-03-21

Publications (1)

Publication Number Publication Date
WO2002074409A1 true WO2002074409A1 (en) 2002-09-26

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ID=8160379

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2002/000178 WO2002074409A1 (en) 2001-03-21 2002-03-18 A filter system

Country Status (1)

Country Link
WO (1) WO2002074409A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008004848A1 (en) * 2006-07-03 2008-01-10 Iman Abdelkabir Filter plug
US8388938B2 (en) 2003-12-08 2013-03-05 Cadbury Holdings Limited Solid oral tooth whitening confectionary composition
JP2016195962A (en) * 2015-04-02 2016-11-24 賢 飯田 Dust collector and cartridge filter
IT202100008099A1 (en) * 2021-04-01 2021-07-01 Aerpura S R L Antibacterial and antiviral filtering device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4422790A (en) * 1981-04-04 1983-12-27 Knecht Filterwerke Gmbh Connecting means for filter cartridges
EP0487831A1 (en) * 1990-11-30 1992-06-03 Pall Corporation Filter units with end connectors
EP0490662A1 (en) * 1990-12-13 1992-06-17 Scapa Group Plc Improved filter element
WO1999052617A1 (en) * 1998-04-15 1999-10-21 Porous Media Corporation Stacked conical filtration or separation apparatus
WO2000078426A2 (en) * 1999-06-22 2000-12-28 Ontario Power Generation Inc. Filter with vacuum cleaning heads

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4422790A (en) * 1981-04-04 1983-12-27 Knecht Filterwerke Gmbh Connecting means for filter cartridges
EP0487831A1 (en) * 1990-11-30 1992-06-03 Pall Corporation Filter units with end connectors
EP0490662A1 (en) * 1990-12-13 1992-06-17 Scapa Group Plc Improved filter element
WO1999052617A1 (en) * 1998-04-15 1999-10-21 Porous Media Corporation Stacked conical filtration or separation apparatus
WO2000078426A2 (en) * 1999-06-22 2000-12-28 Ontario Power Generation Inc. Filter with vacuum cleaning heads

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8388938B2 (en) 2003-12-08 2013-03-05 Cadbury Holdings Limited Solid oral tooth whitening confectionary composition
WO2008004848A1 (en) * 2006-07-03 2008-01-10 Iman Abdelkabir Filter plug
JP2016195962A (en) * 2015-04-02 2016-11-24 賢 飯田 Dust collector and cartridge filter
IT202100008099A1 (en) * 2021-04-01 2021-07-01 Aerpura S R L Antibacterial and antiviral filtering device
WO2022207127A1 (en) * 2021-04-01 2022-10-06 Aerpura S.R.L. Antibacterial and antiviral filtering device

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