CN101641137B - Filter for mask and mask using the same - Google Patents
Filter for mask and mask using the same Download PDFInfo
- Publication number
- CN101641137B CN101641137B CN2008800032236A CN200880003223A CN101641137B CN 101641137 B CN101641137 B CN 101641137B CN 2008800032236 A CN2008800032236 A CN 2008800032236A CN 200880003223 A CN200880003223 A CN 200880003223A CN 101641137 B CN101641137 B CN 101641137B
- Authority
- CN
- China
- Prior art keywords
- filter
- face shield
- space
- air
- facial
- 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 - Fee Related
Links
- 239000004744 fabric Substances 0.000 claims abstract description 66
- 230000001815 facial effect Effects 0.000 claims abstract description 36
- 238000005452 bending Methods 0.000 claims description 10
- 229920003002 synthetic resin Polymers 0.000 claims description 8
- 239000000057 synthetic resin Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 description 12
- 239000000428 dust Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- 239000000835 fiber Substances 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000000241 respiratory effect Effects 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 208000008784 apnea Diseases 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 231100000481 chemical toxicant Toxicity 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 231100001113 dust toxicant Toxicity 0.000 description 1
- 239000012243 dust toxicant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B23/00—Filters for breathing-protection purposes
- A62B23/02—Filters for breathing-protection purposes for respirators
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/02—Masks
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Zoology (AREA)
- Pulmonology (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Professional, Industrial, Or Sporting Protective Garments (AREA)
Abstract
A filter for a mask in which a fibrous filter is folded into filter fabrics such that an outer layer faces external air while the edge portions thereof are sealed to form a shape like an envelope, and which is provided with a connection unit for making a connection with facial fittings of the mask, the filter including a space maintainance member in a space between the overlapped layers of the filter in order to secure a passageway for air to flow towards the connection unit. A mask including facial fittings having an air intake hole connected with the filter by the connection unit and defining a closed space near a mouth or a nose of a user's face when coming close to the mouth or the nose.
Description
Technical field
The present invention relates to a kind of air cleaner that is used to filter toxic chemical substance or dust granule, especially, relate to a kind of portable face shield.
Background technology
Face shield is a kind of air cleaner, is used to prevent airborne noxious material, gets into the respiratory apparatus of human body such as dust granule, poisonous chemical substance, bacterium or the like.Face shield is divided into facial fibrous mask and filter-separable mask.The facial fibrous mask that only is made up of filter fiber has covered facial respiratory apparatus basically, such as mouth or nose, makes the user to breathe extraneous air through facial fibrous mask.Filter-separable mask comprise facial fittings and with the separable filter of facial fittings such as purification assembly.Based on filtering target, face shield also can be divided into dust mask and gas mask.
Although facial fibrous mask is used as dust mask usually; But in order to filter and dust toxicant together; Or when dust is short grained dust or highly toxic dust in order to improve filter efficiency, filter-separable mask also can be used as dust mask.
Through adopting the facial fittings of wearing near face, filter-separable mask can prevent that the air of filtered from getting into human body.In addition; According to filtering target; Through filter being replaced with more effective filter, filter-separable mask can continue to use, and; Through using the check-valves in order to the gas of the gas that air is divided into discharge and entering, said filter-separable mask can improve the inflow efficient of air.Yet filter-separable mask is worn inconvenience, because facial fittings is near user's face.In addition, filter-separable mask comprises facial fittings and the filter that separates, so that when the filter size is big, produces the blind area.Therefore filter extends back in left side and right side usually.
The development of other filter course that is accompanied by recent functional fibre or has the performance of good removal harmful substance; Gas defence and dust mask have substituted (cylindrical) purification assembly type gas mask quilt use widely that has such as the micro particle filtering layer of active carbon layer; Wherein fabric filter is exposed in the extraneous air; So that extraneous air is through filter, promptly the filter fiber through fabric filter is inhaled into gas defence and dust mask.
Substitute cylindrical purification assembly, only adopt the filter-separable of fabric filter as this type of mask.Fabric filter is configured to comprise two overlapping filter clothes (front side and rear side filter cloth); The outer surface of said filter cloth is towards extraneous air; The marginal portion of said filter cloth seals simultaneously, forms the envelope-style separable fibrous filter thus, and the inlet of this big envelope seals.Be included in two inner hollow space between the filter cloth in the separable fibrous filter, and this inner space is separated with space outerpace through two filter clothes.The rear side of two filter clothes is provided with the connector that is connected with the air admission hole of facial fittings.
Yet, just using this separable fibrous filter, in order to improve filter efficiency, should increase towards the surface area of the filter of extraneous air, be drawn into inner air capacity from the outside so that increase, and the speed of the air stream that passes filter of slowing down.Yet if the size that increases filter is in order to increase its surface area, filter can stop user's sight line so, makes the user be difficult to carry out its work.In addition, for example, if filter contacts with object, fabric filter may partly fold or be crooked so.
Summary of the invention
As stated, in having the face shield of separable fibrous filter, the front side of wherein said separable fibrous filter and rear side filter cloth are overlapping, and the inner space between two filter clothes becomes the passage through the filter cloth filtered air.In other words, the air entry that passes facial fittings via being formed on connector and the inner space between front side and the rear side filter cloth on the filter cloth rear side through the filter cloth filtered air flows into human body.If the mid portion of filter is likewise crooked, so in this part, the space between the front side of filter and the rear side filter cloth becomes narrow or closed.Therefore, stop or cut off the air of the outside of passing based on the folded part of air admission hole (being positioned at the part away from the other folded part of air admission hole), the inner space that makes said air can not pass filter flows into air admission hole.In this case, the filtering area of the outside of folded part does not have help to using face shield to breathe, and has caused filter area to reduce in fact.
The present invention proposes for the problems referred to above that solve the traditional face shield with separable fibrous filter; Therefore the purpose of this invention is to provide a kind of face shield with separable fibrous filter; Two (front side and rear side) filter clothes are overlapping and its edge seals in said separable fibrous filter; And in said separable fibrous filter, increased the effective area of filter towards air; Even and when fabric filter is partly folding, also can guarantee the air stream of folded part, kept substantial filter area to a certain extent.
Another object of the present invention provides a kind of face shield with separable fibrous filter, and the outer contacting face area that increases said separable fibrous filter improves filter efficiency thus in order to reduce the speed that air passes filter.
In order to realize above-mentioned purpose of the present invention; According to an aspect of the present invention; A kind of filter that is used for face shield is provided, and wherein two filter clothes are overlapping and its marginal portion seals, thereby form the shape of similar big envelope; Make the outer surface of two filter clothes towards extraneous air; Filter is provided with and is used for the connector that is connected with the facial fittings of face shield, and in order to ensure the passage of the air stream that flows to connector, said filter is included in the space retaining member in the space between two overlapping filter clothes of said filter.
The space retaining member can be configured to by synthetic resin frame, and said synthetic resin frame sets up and is equipped with a plurality of fins that connector extends from the filter lateral.In a zone; A plurality of fins can be horizontally disposed with by fixing spacing; Make perpendicular to fin longitudinally the cross-sectional area of fin form on all broads perpendicular to the direction on fabric filter surface, be parallel on the direction on said surface narrower so that guarantee the space between front side and rear side filter cloth respectively; And make framework light, make that thus longitudinally the passage of flow air is wideer.
In addition, the space retaining member can be configured to have elastic construction, and when being applied on the framework with convenient external force, member can be easily crooked, even and when being in case of bending, said space retaining member also can be guaranteed the space between two filter clothes.Fin can have the notch structure at the mid portion of one of which side, and said fin is towards the bending easily of said notch structure (that is, consider that face shield is normally recurvate when the user wears face shield, therefore said side is towards the back).
According to a further aspect in the invention; A kind of face shield is provided; Comprise: facial fittings be used for the filter of face shield, wherein facial fittings be provided be used for the mounting filtering device with being used to keep according to user's face contour the servicing unit of the shape of crooked filter.
Facial fittings can be the shapes that cover around the mouth and nose, and constitutes with deformable, resilient material that the periphery of the approaching said facial fittings of user's face is made up of silicon rubber.Facial fittings can be provided with the air admission hole with the integrated structure that is used for being connected with filter, and air admission hole has diaphragm, forms check valve structure usually.The gas outlet can be arranged near the mouth and nose with the mode that is included in the hole on its main body and covers the diaphragm in said hole, thus serves as and can discharge breath and stop the check-valves that sucks air.
The servicing unit that is used for the mounting filtering device can make filter be installed as case of bending, makes filter can not stop user's the visual field.
As stated, with the air of prior art only the cylindrical purification assembly of employing that gets into of the front surface through filter compare, when adopting according to separable fibrous filter of the present invention, air can get into through the front side and the rear side filter cloth of filter.In other words, increase extraneous air and get into the area that is passed through, so that increase the air capacity that gets into.In addition, under the situation of the constant amount of air of breathing, if increase the air inlet area of filter, the speed that gets into the air of filter so reduces, and has improved the efficient of filtering out harmful matter thus.
Especially, avoided traditional existing problem of separable fibrous filter, for traditional separable fibrous filter, when filter was folding or crooked, the essence area that is used to suck the filter of air reduced, and makes that the wearer is difficult to breathe.That is,, also can guarantee internal air stream even the part of filter is crooked.Therefore, even the big and filter of filter system is installed as case of bending, the wearer also can easily keep its visual field under the apnea situation of difficult.
In addition, for above-mentioned reasons, filter can be installed in the center of face shield, and need not be for the user's that keeps the visual field and be installed in the left side and the right side of face shield.
Description of drawings
Fig. 1 is the perspective view of diagram fabric filter of the present invention;
Fig. 2 is the perspective view of diagram according to plastic, the withdrawable rack of the embodiment of the invention, and said framework is used as the space retaining member of fabric filter;
Fig. 3 and Fig. 4 are profile and the perspective view of diagram according to the facial fittings of the face shield of the embodiment of the invention; And
Fig. 5 is the perspective view that the diagram fabric filter is attached to the state on the facial fittings of face shield, and said fabric filter is attached on the facial fittings of face shield with servicing unit distortion and the fixing mode that it is used to the mounting filtering device.
The specific embodiment
Describe below with reference to accompanying drawings according to exemplary embodiment of the present invention.
Fig. 1 is the perspective view of diagram fabric filter of the present invention, and Fig. 2 is the perspective view of diagram according to plastic, the withdrawable rack of the embodiment of the invention, and said framework is used as the space retaining member of fabric filter.
See figures.1.and.2, the fabric filter of present embodiment is a big envelope shape filter, thereby wherein filter cloth overlaps each other and forms front side and rear side, and the space between synthetic resin system framework insertion front side and the rear side.
Filter cloth 11 at front side and rear side can constitute through folding filter cloth and the edge that seals by two laps that are folded to form.
In the present embodiment, connector 19 is configured to the critical piece of space of the present invention retaining member.
The space retaining member is whole skeleton structure or frame structure.Frame structure is about being provided with the core minute surface symmetry of connector 19.One side of frame structure comprises the be connected to each other vertical bar 16 of the outer end of supporting said fin 12 simultaneously of a plurality of fins that extend parallel to each other by preset space length 12 and the outer end that makes fin 12.Be connected to the flange section 13 of connector 19 near the other end of the fin 12 of core.Notch 14 is formed on the rear portion (side) of fin 12, when the position of notch 14 when vertical direction is seen identical.
When the direction with horizontally extending fin is called length direction, in the time of will being called width perpendicular to the direction on filter cloth plane, be appreciated that to the space broad ways to be arranged between two filter clothes.Narrow fin is formed on the thickness direction that is parallel to the filter cloth plane, so that guarantee light frame weight, lets air flow into through bigger passage (because fin itself does not occupy large space) along the length direction of fin simultaneously.
With regard to this point, when a side of space retaining member receives in the past the power to pusher, crooked at notch 14 places in all parallel fins 12 of this side.This makes fabric filter 10 crooked at the notch place, is accompanied by the space retaining member and is out of shape backward.
Yet even at sweep, because the width of fin, can guarantee has the space identical with the width of fin between the filter cloth of the front side of defining fabric filter and rear side.Therefore, getting into inner air through front side and rear side filter cloth can continue to flow to connector 19 through the space that is defined between the parallel fin.
Although present embodiment has been described the notch of arranging along the vertical direction of fin 12, on each fin 12, form a notch, the bending of a plurality of vertical extensions can be provided with and be formed on a plurality of notches on each fin.
Fin can be processed such as polyethylene or polypropylene by the synthetic resin based on alkene, and said fin can be crooked by the predetermined elasticity value.Therefore, even without notch, fabric filter also can be crooked smoothly because lateral edges can easily be pushed to the rear.In this case, because the width of fin can be guaranteed the air duct that fabric filter is inner.
Fig. 3 and Fig. 4 are profile and the perspective view of diagram according to the fixture of the face shield of exemplary embodiment of the present invention.
Although do not illustrate, fixture also can be provided with the ribbon that is used for around user's head, makes fixture closely contact with user's head.Especially in facial fittings, hinge 265 is arranged on the top of main element 22, and the servicing unit 263 that is used for the mounting filtering device is connected with hinge at the one of which end.In addition, auxiliary hook correspondingly is arranged on the bottom of main element 22, so that corresponding with the servicing unit that is used for the mounting filtering device 263.When the connector 19 of fabric filter 10 was connected to the air admission hole 24 of facial fittings 20 hermetically through said structure, servicing unit 263 rotated around hinge 265, covers the part of fabric filter 10 cores thus.Servicing unit 263 is provided with at its other end and engages step spare, and said joint step spare fastens to regularly on the auxiliary hook 261 of main element 22 bottoms.
Therefore; As shown in Figure 5; Consider face contour, the servicing unit 263 that is used for the mounting filtering device to be to be the outside of hemispheric shape precoat filter (person's of consulting and using face) basically, make left side and the right side of filter through servicing unit from wearer's face to rear curved.So this bending of filter makes part that filter extends to the side outside the visual field, makes the user can carry out work easily.Simultaneously, although crooked occur in the part between front side and the rear filter layers, still can guarantee to flow to the passage of the air of air admission hole.
As main body, servicing unit 263 can be made up of the synthetic resin of for example PVC.Owing between servicing unit 263 and fabric filter, be provided with the gap usually, so air can arrive the surface of fabric filter.Yet if servicing unit is too near apart from the surface of fabric filter, servicing unit may block the whole surface of fabric filter so.Therefore, servicing unit 263 preferably forms on its most of parts has the mesh surface, wherein sets up many gaps on the mesh surface, so that prevent extraneous air mobile having some setbacks between servicing unit and filter.Perhaps, servicing unit is provided preferably with a plurality of pores, so that extraneous air can easily arrive the surface of fabric filter through pore.
In the present embodiment, between front side that constitutes fabric filter and rear side filter cloth, install synthetic fibers system, plug-type space retaining member.The space retaining member is made up of the fin that is arranged in parallel with each other 12.Be inhaled into human body through the connector of fabric filter and the air admission hole of facial fittings along the fixed space between the fin of space retaining member through filtered air through what filter course got into the fabric filter inner space.The space retaining member can be changed into the various forms that removes above-mentioned form.
The present invention can be applicable to health and security tool field, and face shield of the present invention can be used for various places, such as construction site, chemical plant or the like.
Claims (7)
1. filter that is used for face shield comprises:
Filter cloth, said filter cloth are overlapping and its marginal portion seals, thereby form big envelope shape shape, make the outer surface of said filter cloth towards extraneous air;
Linkage unit is used for being connected with the facial fittings of said face shield in the part foundation of said filter cloth;
The space retaining member is arranged in the space between the said filter cloth, so that guarantee to flow to the passage of the air of said linkage unit.
2. the filter that is used for face shield as claimed in claim 1; Wherein, said space retaining member comprises the framework that is provided with a plurality of fins that said linkage unit extends from said filter lateral, makes cross-sectional area perpendicular to each said a plurality of fins of said finned length direction form on perpendicular to the direction of said filter surfaces broad relatively; Promptly; On the width of said fin, so that guarantee the said space between said filter cloth, and said cross-sectional area also forms on the direction that is parallel to user's face narrower; That is, on the thickness direction of said fin.
3. the filter that is used for face shield as claimed in claim 2; Wherein, Said space retaining member is configured to have elastic construction, makes that said space retaining member is bending easily when external force is applied on the mid portion of said framework; Even and when being in case of bending, said space retaining member also can be guaranteed the said space between the said filter cloth.
4. the filter that is used for face shield as claimed in claim 3; Wherein, At said mid portion, said fin has the notch structure on the one of which side, and the said notch that is formed on said a plurality of fin is arranged by same direction; Make that when external force is applied on the said filter said filter can be easily crooked.
5. the filter that is used for face shield as claimed in claim 2; Wherein, Said linkage unit is provided with and is used for the synthetic resin connector that is connected with said facial fittings, and said framework is integrally formed with mode and said connector about said connector lateral symmetry.
6. face shield comprises:
Like each described filter that is used for face shield in the claim 1 to 5; And
Facial fittings; Said facial fittings has air admission hole; Said air admission hole is connected with said filter through the said linkage unit of the said filter of said face shield; And when said facial fittings near user's mouth or during nose, near facial mouth of user or nose, define an enclosure space.
7. face shield as claimed in claim 6; Wherein, Said facial fittings is provided with servicing unit, when the user wears said face shield, said servicing unit with cover from the front side said filter and with reference to facial make said filter backward the bent mode of lateral bending be used to install said filter.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020070136072A KR100900755B1 (en) | 2007-12-24 | 2007-12-24 | Filter for mask and mask using the same |
| KR1020070136072 | 2007-12-24 | ||
| KR10-2007-0136072 | 2007-12-24 | ||
| PCT/KR2008/007664 WO2009082170A2 (en) | 2007-12-24 | 2008-12-24 | Filter for mask and mask using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101641137A CN101641137A (en) | 2010-02-03 |
| CN101641137B true CN101641137B (en) | 2012-05-23 |
Family
ID=40801697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008800032236A Expired - Fee Related CN101641137B (en) | 2007-12-24 | 2008-12-24 | Filter for mask and mask using the same |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100900755B1 (en) |
| CN (1) | CN101641137B (en) |
| WO (1) | WO2009082170A2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100961411B1 (en) * | 2009-08-04 | 2010-06-09 | (주)씨앤투스 | The filter cartridge for face mask |
| USD779674S1 (en) | 2015-02-27 | 2017-02-21 | 3M Innovative Properties Company | Filter element having a connector |
| USD786443S1 (en) | 2015-02-27 | 2017-05-09 | 3M Innovative Properties Company | Filter element |
| USD792959S1 (en) | 2015-02-27 | 2017-07-25 | 3M Innovative Properties Company | Filter element having a pattern |
| AU2016223087B2 (en) | 2015-02-27 | 2019-01-03 | 3M Innovative Properties Company | Flexible filter element having an end outlet |
| KR101785801B1 (en) | 2015-11-23 | 2017-11-15 | 주식회사 나루씨이엠 | Breathing frame of mask |
| KR200497995Y1 (en) | 2020-11-19 | 2024-05-14 | 임병호 | The mask having a gas ejector |
| KR102565804B1 (en) * | 2020-12-15 | 2023-08-10 | 은익수 | Mask with large filtering surface and side open encapsulation type filter for the same |
| KR20230103190A (en) | 2021-12-31 | 2023-07-07 | 주식회사 휴먼퍼스트 | Manufacturing method of melt blown filter for biodegradable mask |
| KR20230002257U (en) | 2022-05-19 | 2023-11-28 | 임병호 | The mask having a gas ejector |
| KR20240000403U (en) | 2022-08-23 | 2024-03-04 | 임병호 | The mask having a gas ejector |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4630604A (en) * | 1985-04-09 | 1986-12-23 | Siebe North, Inc. | Valve assembly for a replaceable filter respirator |
| CN1098714C (en) * | 1997-07-29 | 2003-01-15 | 千野光政 | Dust-proof mask |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR930009922B1 (en) * | 1986-09-10 | 1993-10-13 | 지이브 노어스 인코포레이팃드 | Valve assembly for a replaceable filter respirator |
| KR100330257B1 (en) * | 2000-01-11 | 2002-04-01 | 정정대 | Filter for dust proof mask |
| KR200289005Y1 (en) * | 2002-05-27 | 2002-09-11 | 정문현 | A dustproof mask |
| KR200375729Y1 (en) * | 2004-11-30 | 2005-03-08 | 온누리플랜(주) | The mask for freventing from dust |
-
2007
- 2007-12-24 KR KR1020070136072A patent/KR100900755B1/en active IP Right Review Request
-
2008
- 2008-12-24 CN CN2008800032236A patent/CN101641137B/en not_active Expired - Fee Related
- 2008-12-24 WO PCT/KR2008/007664 patent/WO2009082170A2/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4630604A (en) * | 1985-04-09 | 1986-12-23 | Siebe North, Inc. | Valve assembly for a replaceable filter respirator |
| CN1098714C (en) * | 1997-07-29 | 2003-01-15 | 千野光政 | Dust-proof mask |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101641137A (en) | 2010-02-03 |
| KR100900755B1 (en) | 2009-06-02 |
| WO2009082170A3 (en) | 2009-09-11 |
| WO2009082170A2 (en) | 2009-07-02 |
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