CN111109707A - External filterable protective facial mask - Google Patents
External filterable protective facial mask Download PDFInfo
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- CN111109707A CN111109707A CN202010083142.4A CN202010083142A CN111109707A CN 111109707 A CN111109707 A CN 111109707A CN 202010083142 A CN202010083142 A CN 202010083142A CN 111109707 A CN111109707 A CN 111109707A
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- nasal
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- 230000001681 protective effect Effects 0.000 title claims abstract description 28
- 230000001815 facial effect Effects 0.000 title claims description 6
- 238000001914 filtration Methods 0.000 claims abstract description 55
- 210000000214 mouth Anatomy 0.000 claims abstract description 29
- 210000003928 nasal cavity Anatomy 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910021389 graphene Inorganic materials 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 238000004659 sterilization and disinfection Methods 0.000 claims description 5
- 239000004745 nonwoven fabric Substances 0.000 claims description 4
- 230000001954 sterilising effect Effects 0.000 claims description 4
- 241000711573 Coronaviridae Species 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 6
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 241000700605 Viruses Species 0.000 description 2
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- 229910002027 silica gel Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
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- 206010011409 Cross infection Diseases 0.000 description 1
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- 241000206602 Eukaryota Species 0.000 description 1
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Images
Classifications
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
- A41D13/1107—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
- A41D13/1138—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a cup configuration
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
- A41D13/1192—Protective face masks, e.g. for surgical use, or for use in foul atmospheres with antimicrobial agent
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/02—Layered materials
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
-
- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D31/00—Materials specially adapted for outerwear
- A41D31/04—Materials specially adapted for outerwear characterised by special function or use
- A41D31/30—Antimicrobial, e.g. antibacterial
Abstract
The invention relates to an external filtering protective mask, which comprises an oral-nasal mask body and a filtering module, wherein an oral cavity and a nasal cavity are formed in the oral-nasal mask body, wherein: the filter module is detachably hung on the front outer side of the oral-nasal mask body, the filter module is provided with a filter cavity, a filter body is arranged in the filter cavity, a communicating seat is arranged between the oral-nasal cavity and the connecting part of the filter cavity and communicated with the filter cavity, and a one-way valve is arranged on the communicating seat. Through straining the independent components of a whole that can function independently design of module and oronasal mask body, can carry out cleaning and disinfecting respectively when realizing changing filter module or wherein crossing the filter body, because filter module and oronasal mask body have certain interval simultaneously, realize keeping away from the oronasal, prevent the touching, reduce the contact oronasal mask body probability, realize effectively protecting the superstrong "novel coronavirus" use of transmission.
Description
Technical Field
The invention relates to a mask, in particular to an external filtering protective mask.
Background
The epidemic situation of the novel coronavirus is developed in the spring festival 2020, and the traditional N95 protective mask is worn to have certain separation effect due to the fact that the novel coronavirus has the characteristics of people passing, high propagation speed and the like, but is replaced when used for 4 hours, and large-area goods shortage of the disposable mask in the market is caused due to frequent replacement. The traditional N95 protective mask is made of integral filtering cotton material or non-woven fabric, and the filtering material is thicker. The inner face of the mask is tightly attached to the face, which causes discomfort to the skin of the face, unsanitary use and poor filtering effect. The mask is discarded after being used once, which causes waste and high use cost. In addition, the electronic air supply mask has a complex structure and higher manufacturing cost. When facing 'novel coronavirus', the repeatedly used cover body with the fan cannot be effectively disinfected and cleaned. Because the filter body is an integrated design structure arranged in the cover body, the filter body can be replaced or cleaned easily to touch viruses left on the surface of the cover body, and the novel coronavirus filter is not particularly suitable for novel coronavirus with ultra-strong transmission force.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an external filtering protective mask, which can realize respective cleaning and disinfection when replacing a filtering module or a filtering body in the filtering module through the independent split design of the filtering module and an oral-nasal mask body, and simultaneously, because the filtering module is externally arranged outside the oral-nasal mask body and has a certain spacing distance, the filtering module is far away from the mouth and the nose, prevents touch, reduces the probability of contacting the oral-nasal mask body, and realizes the use of ultra-strong novel coronavirus with effective protection and transmission capacity.
In order to solve the technical problem, the invention provides an external filtering protective mask, which comprises an oral-nasal mask body and a filtering module, wherein an oral cavity and a nasal cavity are formed in the oral-nasal mask body, wherein: the filter module is detachably hung on the front outer side of the mask body, the filter module is provided with a filter cavity, a filter body is arranged in the filter cavity, a communicating seat is arranged between the oral cavity and the filter cavity and communicated with the oral cavity and the nasal cavity, and the communicating seat is provided with a one-way valve. Through the independent components of a whole that can function independently design of filter module and oronasal mask body, the oronasal mask body is the open cover body, filter module dismantled and assembled hanging is established in cover body anterolateral side during the built-up state, filter chamber inboard output side and oronasal cavity input side communicate through intercommunication seat pipeline when connecting, filter module is to hang and establishes the state and set up in cover body anterolateral side, can carry out cleaning and disinfecting respectively with the oronasal mask body when realizing changing filter module or wherein the filter body, simultaneously because filter module and oronasal mask body have certain interval, realize keeping away from the oronasal, prevent the touching, reduce contact oronasal mask body probability, the super strong "novel coronavirus" effective protection of specially adapted spreading force is used, the check valve of non return is established to the intercommunication seat. When the nasal cavity filter is used, air enters the front side of the filter cavity from the air inlet hole of the front buckle cover in a one-way mode, enters the rear side of the filter cavity after being filtered by the filter body, and then enters the nasal cavity through the communicating seat. Wherein the side edge of the filter body and the side wall of the filter cavity are in a sealing and pressing structure through the front buckle cover, and the filter cavity is divided into a front side and a rear side through the filter body.
The filter chamber of the external filtering protective mask is an opening shell, the front buckle cover is arranged on the outer side of the opening of the filter chamber, the front buckle cover is provided with an externally communicated air inlet, and the filter body is arranged in the filter chamber through the front buckle cover. The filter body in the replaceable filter module can be independently replaced, and the filter cavity shell of the filter module can be independently cleaned and disinfected. When the nasal cavity filter is used, air enters the front side of the filter cavity from the air inlet hole of the front buckle cover, enters the rear side of the filter cavity after being filtered by the filter body, and then enters the nasal cavity through the communicating seat. Wherein the side edge of the filter body and the side wall of the filter cavity are in a sealing and pressing structure through the front buckle cover, and the filter cavity is divided into a front side and a rear side through the filter body. The filter body can be replaced independently during use, and only the front buckle cover needs to be opened from the opening shell to replace the filter body, so that the purpose of replacing the filter body is realized.
The oral cavity and the nasal cavity of the external filtering protective mask are provided with connecting holes, the communicating seat is arranged on the rear inner side of the filtering cavity, and the filtering module is positioned in the connecting holes through the communicating seat. The free end part of the communicating seat integrated with the filtering module is connected with the connecting hole of the oral cavity and the nasal cavity, so that the filtering module can be disassembled and assembled, and the rear side of the filtering cavity is hermetically communicated with the oral cavity and the nasal cavity during insertion. The communicating base can also be arranged at the front side of the oral cavity and the nasal cavity, the back inner side of the corresponding filter cavity is provided with a connecting hole, and the filter module is positioned with the communicating base through the connecting hole.
The above external filtering protective mask has the one-way valve arranged on the communicating seat. Through the check valve that sets up the non return at the intercommunication seat, when using, air one-way gets into the filter chamber front side from the inlet port of buckle closure, gets into the filter chamber rear side after the filter body filters, back through intercommunication seat inlet port nasal cavity. Wherein the side edge of the filter body and the side wall of the filter cavity are in a sealing and pressing structure through the front buckle cover, and the filter cavity is divided into a front side and a rear side through the filter body.
Foretell filterable protective facial mask of external, the filter body includes from outer to interior sterilization paper layer, graphite alkene base filter medium layer, solid alkali layer and the non-woven fabrics layer of stacking in proper order. Wherein the AOP-KF solid alkali has strong effect of killing virus and bacteria, but does not produce toxic effect on animal and plant organisms. The reason is that the cell structure of bacteria is quite different from that of higher animals and plants, bacteria are prokaryotes, and animals and humans are eukaryotes. Most enzyme systems in prokaryotic cells are distributed on the near surface of a cell membrane and are easy to attack, while enzyme systems of eukaryotic cells are deep into the cells and are not easy to attack by AOP-KF solid alkali and cannot cause damage to the cells. In addition, higher animals and plants not only have a multicellular complex organic structure, but also form a protective system against various oxidants in vivo. Therefore, the antibacterial agent has no harm to animals, plants and human bodies, and has broad-spectrum antibacterial property and high safety. The functionalized graphene has extremely high specific surface area and contains abundant adsorption sites such as a large number of functional groups and defects. The structure of the functionalized graphene sheet layer is compounded on the framework of the base material by adopting a unique compounding technology to form the filter material with a three-dimensional multistage porous structure, so that the multistage filtering effect is achieved. On one hand, the graphene film layer makes up for large gaps of a base material framework structure, the aperture is greatly reduced (the aperture of the vast majority is smaller than 2 microns), and PM2.5 particles are physically blocked. On the other hand, the air door is formed, and has a switching effect, wherein the air door is opened in a positive direction when air is discharged and is opened in a negative direction when air is introduced. Due to the extremely small pore size of graphene membranes (a significant fraction of pores are smaller than one micron), and the complete longitudinal coverage, which is equivalent to multi-layer filtration, the graphene membranes block most of PM2.5, even PM1 (since PM1 is not well known, detection means at home and abroad are almost none, but particles which can enter blood vessels). Due to the above characteristics. The product fundamentally changes the principle that most masks in the market depend on electrostatic adsorption, and completely utilizes the interception and adsorption method to block PM 2.5.
The oral cavity and the nasal cavity of the external filtering protective mask are provided with the air outlet valve communicated outwards in a single direction. When the patient exhales, the exhaled air is discharged in a one-way mode through the air outlet valve.
The free end of the communication seat is provided with a concave ring groove, the connecting hole is provided with a buckle ring edge, and the buckle ring edge is sleeved in the concave ring groove. The connecting seat is provided with a concave ring groove, the elastic buckle ring edge is buckled in the groove of the connecting seat to realize that the whole filtering module can be detached from the mask body for cleaning, and the mask body and the filtering module can be cleaned. When the buckle ring edge is buckled in the groove of the communication seat, the outer wall of the clamping groove realizes the sealing connection effect of tightly sleeving the communication seat.
In the external filtering protective mask, the inner wall of the bottom of the filtering cavity is provided with the gap support, and the filtering body is arranged on the gap support. The filter body is supported and positioned by the gap arranged on the inner wall of the bottom of the filter cavity, so that the filter cavity is divided into an air inlet side at the front side and an air outlet side after the rear side is filtered by the filter body. The air outlet side forms a certain easy storage cavity for the purpose of air supply to the oral cavity and the nasal cavity.
In the waterproof protective mask, the mask body is a soft rubber cover. Because the mask body is a soft rubber mask, the mask body is only in small-area contact with the end face of the sleeve wall with the attaching edge of the oral cavity, the nasal cavity and the cheek after being worn, and the technical problem that the existing mask avoids the face skin discomfort caused by the overlarge attaching face is solved. Simultaneously, buckle the ring limit through the buckle of the oronasal mask body and establish in the recess of intercommunication seat, realize filtering module detachable construction, the filter chamber rear side communicates with oronasal cavity is sealed during cartridge.
The one-way valve and the air outlet valve of the waterproof protective mask respectively comprise a seat body and a valve plate, and the valve plate covers the seat body. The valve plate cover is made of soft colloid and positioned on the seat body to realize the switching between two states of one-way closing and opening.
The filter chamber and the outer side of the front buckle cover are respectively provided with the dismounting buckle. The filter cavity and the front buckle cover are separated or covered by the correspondingly arranged disassembly buckle so as to disassemble and assemble the filter material.
Compared with the prior art, the technical scheme of the invention has the following characteristics:
the maintenance is convenient, the comprehensive cost is low:
1. the silica gel mask can be sterilized by boiling water. The material has high stability, the normal service life is more than 3 years, and the comprehensive use cost is lower.
2. The filter screen is portable and convenient to disassemble and replace.
3. High productivity and high efficiency.
(II) comfort aspect:
1. the appearance structure is that the whole mask follows the proportion of the facial structure of a human body, and is suitable for various facial shapes. The large-area skin-friendly veneer has the advantages of wide visual field, convenient wearing, no leakage, light weight, no falling feeling and no pressing feeling.
2. The skin-friendly material is as follows: the mask main body is made of a baby nipple material, namely food-grade liquid silica gel, and the mask has the advantages of good resilience, no deformation, strong sealing, aging resistance, no fading, corrosion resistance, high and low temperature (temperature resistance range of-40 ℃ to +230 ℃), softness, comfort, no toxicity and no smell.
3. Low loss: the design of minimum area under the prerequisite of face guard filter pulp guarantee respiratory comfort degree guarantees the biggest supply of material volume of filter core (consumptive material).
(III) functional aspects:
1. AOP-KF solid alkali and 99.5 percent of high-efficiency filter material, and has very high sterilization, formaldehyde removal, air purification and filtration grade.
2. The leakproofness is strong, and the cavity adopts the newly-designed seal structure, and local only 0.4mm is thick, and soft close skin, mouth and nose driving fit, inside and outside perfect adaptation.
3. The double-communicating-seat one-way breather valve is specially designed, so that one-way circulation of airflow is realized, and cross infection is reduced.
4. By calculating the vital capacity of the human body and the optimized design of the triangular air cavity, the exhaled waste gas is discharged in time, and the infection of the human body is reduced.
Drawings
The invention will be further described in detail with reference to examples of embodiments in the drawings to which, however, the invention is not restricted.
FIG. 1 is a schematic view of the disassembled structure of the present invention;
FIG. 2 is a schematic front side three-dimensional structure of the present invention;
FIG. 3 is a rear perspective view of the present invention;
FIG. 4 is a schematic diagram of the right-hand side view of the present invention;
FIG. 5 is a schematic bottom view of the present invention;
FIG. 6 is a schematic view of the vertical cross-section of the present invention;
FIG. 7 is a schematic diagram of a transverse cross-sectional configuration of the present invention;
FIG. 8 is a schematic front side perspective view of a filtration module of the present invention;
FIG. 9 is a schematic rear side three-dimensional construction of a filtration module of the present invention;
FIG. 10 is a schematic diagram of the right side view of the filtration module of the present invention;
FIG. 11 is a schematic view of a vertical cross-section of a filtration module of the present invention;
FIG. 12 is a schematic cross-sectional view of a filtration module of the present invention;
FIG. 13 is a schematic front side perspective view of an oral-nasal mask body of the present invention;
FIG. 14 is a schematic rear perspective view of an oral-nasal mask body of the present invention;
FIG. 15 is a schematic view in vertical section of an oral-nasal mask body of the present invention;
FIG. 16 is a schematic diagram of a transverse cross-sectional configuration of an oral-nasal mask body of the present invention.
Detailed Description
As shown in fig. 1-16, the external filtering protective mask of the present invention comprises an oral-nasal mask body 1 and a filtering module 2, wherein the oral-nasal cavity 11 is formed in the oral-nasal mask body 1, the filtering module 2 is detachably hung on the front outer side of the mask body 1, the filtering module 2 is provided with a filtering cavity 21, a filtering body 22 is arranged in the filtering cavity 21, a communicating seat 3 is arranged between the connecting parts of the oral-nasal cavity 11 and the filtering cavity 21 for communication, and the communicating seat 3 is provided with a one-way valve 4.
The filter cavity 21 is an open shell, a front buckle cover 23 is arranged on the outer side of the opening of the filter cavity 21, the front buckle cover 23 is provided with an air inlet 231 communicated with the outside, and the filter body 22 is arranged in the filter cavity 21 through the front buckle cover 23.
The oral cavity 11 is provided with a connecting hole 12, the communicating seat 3 is arranged at the rear inner side of the filter cavity 21, and the filter module 2 is positioned in the connecting hole 12 through the communicating seat 3.
The check valve 4 is provided on the communication seat 3.
The filter 22 includes a sterilization paper layer, a graphene-based filter material layer, a solid alkali layer and a non-woven fabric layer stacked in sequence from outside to inside.
The oral cavity 11 is provided with a single outward-communicated air outlet valve 5.
The inner wall of the bottom of the filter cavity 21 is provided with a gap support 211, and the filter body 22 is arranged on the gap support 211.
The free end of the communicating base 3 is provided with a concave ring groove 31, the connecting hole 12 is provided with a snap ring edge 121, and the snap ring edge 121 is sleeved in the concave ring groove 31.
The mask body 1 is a soft rubber cover.
The one-way valve 4 and the air outlet valve 5 respectively comprise a seat body and a valve plate, and the valve plate is covered on the seat body.
The outer sides of the filter cavity 21 and the front buckle cover 23 are respectively provided with a dismounting buckle.
When the mask is used specifically, the free outer end part (rear end part) of the sleeve type oral-nasal cavity 11 at the rear side of the oral-nasal mask body 1 is an opening, and the opening is expanded to form a technical effect that the bell mouth can be freely adjusted to a matched joint position when the bell mouth corresponds to the cheek of the oral-nasal cavity. After the mask body 1 is worn well, the attaching edges of the mask body and the cheeks in the oral cavity and the nasal cavity are only in small-area contact with the end face of the sleeve wall, and the technical problem that the existing mask avoids that the attaching face is too large and the skin of the face is uncomfortable is solved. The face is separated from the front wall surface of the oral cavity and the nasal cavity 11 by a certain distance through the joint edge, so that the face can not be tightly attached to the front wall surface of the oral cavity and the nasal cavity 11. The outside of wall sets up external filter module 2 before oral cavity 11, filter module dismantled and assembled during the built-up state hangs and establishes outside before the cover body, filter module inboard output side and oral cavity input side communicate through the intercommunication seat when connecting, filter module is to hang and establishes the state and sets up outside before the cover body, realize changing filter module 2 or wherein cross the filter body 22 the time can carry out respectively cleaning and disinfecting with the oral cavity body 1 respectively, simultaneously because filter module and oral cavity body 1 have certain interval, realize keeping away from the oral cavity, prevent the touching, reduce contact oral cavity body probability. When the nasal cavity filter is worn and used, external air enters the front side of the filter cavity 21 from the air inlet 231 of the front buckle cover 23 in a one-way mode, enters the rear side of the filter cavity 21 after being filtered by the filter body 22, and then enters the nasal cavity 11 through the communicating seat. Wherein the side edge of the filter body 22 and the side wall of the filter cavity 21 are in a sealing and pressing structure through a front buckle cover, and the filter cavity is divided into a front side and a rear side through the filter body.
In summary, the actual samples of the present invention are prepared according to the description and the drawings, and after a plurality of usage tests, the effect of the usage tests proves that the present invention can achieve the expected purpose, and the practical value is undoubted. The above examples are given for the convenience of illustration of the invention. The present invention is not intended to be limited to the above embodiments, and those skilled in the art can easily understand that the technical features of the present invention can be modified and changed without departing from the scope of the present invention.
Claims (10)
1. The utility model provides an external filterable protective facial mask, includes the oral and nasal mask body (1) and filters module (2), forms oral and nasal cavity (11), its characterized in that in the oral and nasal mask body (1): the detachable filter module (2) is hung on the front outer side of the mask body (1), the filter module (2) is provided with a filter chamber (21), a filter body (22) is arranged in the filter chamber (21), a communicating seat (3) is arranged between the mask body (11) and the filter chamber (21) and communicated with each other, and the communicating seat (3) is provided with a one-way valve (4).
2. The external filtering protective mask according to claim 1, wherein: the filter cavity (21) is an open shell, a front buckle cover (23) is arranged on the outer side of the opening of the filter cavity (21), an externally communicated air inlet hole (231) is formed in the front buckle cover (23), and the filter body (22) is arranged in the filter cavity (21) through the front buckle cover (23).
3. The external filtering protective mask according to claim 1, wherein: the oral cavity (11) is provided with a connecting hole (12), the communicating seat (3) is arranged at the rear inner side of the filtering cavity (21), and the filtering module (2) is positioned in the connecting hole (12) through the communicating seat (3).
4. The external filtering protective mask according to claim 3, wherein: the one-way valve (4) is arranged on the communicating seat (3).
5. The external filtering protective mask according to claim 1, wherein: the filter body (22) comprises a sterilization paper layer, a graphene-based filter material layer, a solid alkali layer and a non-woven fabric layer which are sequentially stacked from outside to inside.
6. The external filtering protective mask according to claim 1, wherein: the oral cavity (11) is provided with an air outlet valve (5) which is communicated with the outside in a single direction.
7. The external filtering protective mask according to claim 2, wherein: the inner wall of the bottom of the filter cavity (21) is provided with a gap support (211), and the filter body (22) is arranged on the gap support (211).
8. The external filtering protective mask according to claim 3, wherein: the free end of the communicating seat (3) is provided with a concave ring groove (31), the connecting hole (12) is provided with a snap ring edge (121), and the snap ring edge (121) is sleeved in the concave ring groove (31).
9. The waterproof protective mask according to claim 1, characterized in that: the mask body (1) is a soft rubber mask.
10. The waterproof protective mask according to claim 6, characterized in that: the outer sides of the filter cavity (21) and the front buckle cover (23) are respectively provided with a dismounting buckle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010083142.4A CN111109707A (en) | 2020-02-08 | 2020-02-08 | External filterable protective facial mask |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010083142.4A CN111109707A (en) | 2020-02-08 | 2020-02-08 | External filterable protective facial mask |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111109707A true CN111109707A (en) | 2020-05-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010083142.4A Pending CN111109707A (en) | 2020-02-08 | 2020-02-08 | External filterable protective facial mask |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111109707A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111480916A (en) * | 2020-05-26 | 2020-08-04 | 追信数字科技有限公司 | Portable gauze mask of disconnect-type |
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| CN111480916A (en) * | 2020-05-26 | 2020-08-04 | 追信数字科技有限公司 | Portable gauze mask of disconnect-type |
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