WO2022270834A1 - Masque réutilisable - Google Patents

Masque réutilisable Download PDF

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Publication number
WO2022270834A1
WO2022270834A1 PCT/KR2022/008664 KR2022008664W WO2022270834A1 WO 2022270834 A1 WO2022270834 A1 WO 2022270834A1 KR 2022008664 W KR2022008664 W KR 2022008664W WO 2022270834 A1 WO2022270834 A1 WO 2022270834A1
Authority
WO
WIPO (PCT)
Prior art keywords
mask
filter
frame member
support frame
air
Prior art date
Application number
PCT/KR2022/008664
Other languages
English (en)
Korean (ko)
Inventor
이대용
Original Assignee
이대용
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 이대용 filed Critical 이대용
Publication of WO2022270834A1 publication Critical patent/WO2022270834A1/fr

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Classifications

    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B23/00Filters for breathing-protection purposes
    • A62B23/02Filters for breathing-protection purposes for respirators
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/11Protective face masks, e.g. for surgical use, or for use in foul atmospheres
    • A41D13/1107Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00Disinfection, sterilisation or deodorisation of air
    • A61L9/16Disinfection, sterilisation or deodorisation of air using physical phenomena
    • A61L9/18Radiation
    • A61L9/20Ultraviolet radiation
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing 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
    • A62B18/02Masks
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing 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
    • A62B18/08Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
    • A62B18/084Means for fastening gas-masks to heads or helmets
    • AHUMAN NECESSITIES
    • A62LIFE-SAVING; FIRE-FIGHTING
    • A62BDEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B18/00Breathing 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
    • A62B18/08Component parts for gas-masks or gas-helmets, e.g. windows, straps, speech transmitters, signal-devices
    • A62B18/10Valves
    • AHUMAN NECESSITIES
    • A41WEARING APPAREL
    • A41DOUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D2500/00Materials for garments

Definitions

  • the present invention relates to a reusable mask device having a separation structure. More specifically, in a mask worn on a person's face, it can block fine dust, harmful gases, etc., breathe purified air, block droplets generated during breathing from the person and the outside, and sterilize viruses introduced from the outside. It relates to a mask device capable of inhaling and exhaling only purified air through a filter.
  • the present invention separates the wearer's nose breathing part and mouth breathing part to prevent contamination of the mask filter by bacteria in the mouth breathing part, so that the mask filter can be reused, and the mask body part and the filter part can be separated to be worn for a long time. It relates to a reusable mask having a separation structure that can be used.
  • the inner space of the mask is spatially blocked by the region blocking part and partitioned into at least two spaces, and the partitioned space includes the wearer's nose and forms an inhalation part to which an intake filter is connected so that outside air flows in. an intake area; and an exhaust area including the wearer's mouth and connected to the exhaust filter to which the wearer's exhaled breath is discharged.
  • a blocking film closely adhered therebetween, wherein the blocking film allows air in the intake area to move to an exhaust area to allow oral respiration, and blocks the air in the exhaust area from moving to the intake area.
  • a valve is formed, and the mask corresponding to the exhaust region is further formed with an auxiliary inhalation unit to which an intake filter is detachably coupled, and an exhalation induction fan for guiding the wearer's exhalation to be discharged in the exhalation unit; It consists of
  • the region blocking portion extends from an upper portion of the inner surface and forms a nose cap to cover the wearer's nose, and has a region separation structure that extends into the oral cavity and receives oxygen using a mouth tube.
  • the patented invention is configured to supply air to a mask by driving an air purifier equipped with a power supply and an exhalation induction fan, and the use of the power supply and motor fan of the air purifier can give inconvenience of heat and noise, and the weight of the external oxygen supply unit When worn for a long time, there is a problem that the body is burdened and cannot be transparently processed with a structure in which the mask body and the filter are combined like conventional masks.
  • the patented invention the air purifier housing supported through the user's neck; A mask having a space inside while being worn to cover the mouth or nose; And, a configuration including a clean air supply means installed to supply filtered air to the space of the mask, and to forcibly supply the filtered air to the space by a drive motor installed in the air purifier housing, and the mask has a constant
  • a reinforcing piece maintaining its shape and a contact member in close contact with the skin are integrally provided on the main body, and the contact member has a shape with an air bag and is connected in a state in which it protrudes along the edge of the main body so that the main body adheres to the skin
  • the air purifier housing is equipped with a drive motor connected to a power supply unit and one or more air supply fans, an intake grill for introducing air supplied to the air supply fan, and an exhaust pipe for supplying supplied air to the mask.
  • a supporting jaw is provided inside the air purifier housing to attach a plurality of filters to each other, and the plurality of filters are simultaneously supported through a bracket member that is a combination of a pre-filter, a carbon filter, and a HEPA filter and can be separated and combined.
  • the bracket member is a mask-type air cleaning system having a configuration in which a plurality of bracket members are simultaneously mounted through at least one first and second coupling piece, which is a male-female coupling structure, to which a filter having a support hole in an inner diameter is mounted.
  • the patented invention connects an air purifier having a power source and a motor fan to a mask through an exhaust pipe and drives the air purifier to supply air to the mask.
  • the air sterilizer type mask using a light emitting diode ultraviolet lamp has a two-layer structure, a body worn on the face to cover the nose and mouth through a hanging member hanging on the ear; and a first light emitting diode ultraviolet lamp installed inside the body to sterilize air flowing into the nose and mouth across the outer skin and inner skin of the body with ultraviolet rays irradiated from the first light emitting diode ultraviolet lamp.
  • harmful dust introduced from the outside is primarily filtered by the body, and harmful bacteria contained in the air that is primarily filtered through the wearer's nose and mouth by the ultraviolet rays irradiated from the light emitting diode ultraviolet lamp are removed.
  • the patented invention has a structure in which a light emitting diode lamp for sterilization is built into the mask itself, so it may be uncomfortable to wear the mask, and the filter part of the mask is covered by the installation of a sterilization lamp, etc. There is a problem that the filtering function of air may deteriorate. .
  • the air filter function of the mask is separated, and the air filter function function is non-powered and made of a light weight material so that the wearer does not feel uncomfortable, and the air filter function can sterilize the contaminated air.
  • a small sterilizing lamp is installed, and the mask separated from the air filter function is made of a transparent or semi-transparent material that can block the outside, so that the outside air is not directly filtered by the mask, and the air inhaled and discharged can be sterilized.
  • the invention of a reusable mask is desired.
  • the present invention is to solve the problems of the prior art, the object of the present invention, the air filter function and the external air exposure blocking function of the lower part of the eye of the face are separated from the nose breathing part and the mouth breathing part to mouth breathing It is to provide a reusable mask capable of reusing the mask by preventing contamination of the mask filter due to the present invention.
  • Another object of the present invention is to provide a reusable mask capable of sterilizing air passing through the air filter function part by installing a UV-C LED sterilization lamp in the air filter function part.
  • Another object of the present invention is a reusable mask having a shape in which the external blocking function part of the lower part of the face can be blocked depending on the external gaze or use environment by using a transparent light material. is in providing
  • the material of the transparent synthetic resin in the first aspect of the present invention, the material of the transparent synthetic resin
  • the material is in the shape of a face, and the upper portion surrounding the nose and the lower portion surrounding the mouth are formed to be separated.
  • a skin member made of a thin and opaque material for detachably attaching upper and lower parts of the mask part to the surface of the mask part to block the exposure of the wearer's mouth and nose to the external line of sight from the transparent mask part; left and right air distribution pipes of a predetermined length connected to through-holes on both sides of the mask part;
  • a filter support frame member having filter side through-holes connected to the ends of the left and right air distribution pipes on both sides, having a predetermined width and length, and having an arcuate shape with two openings;
  • a filter cover frame member made of synthetic resin having a width and a length corresponding to the filter support frame
  • a reusable mask further comprising a UV-C LED germicidal lamp installed inside the filter supporting frame member and turned on by a rechargeable power source or battery power is provided.
  • the air filter function and the external air exposure blocking function of the lower part of the face are separated, so that the mask can be made of a material that does not allow air to flow in from the outside, so that contaminated air, fine dust, or viruses do not enter the mask.
  • a UV-C LED germicidal lamp is installed on the air filter function part to sterilize and further purify the air passing through the air filter function part, and the external blocking function part of the lower part of the face is transparent. It is made of lightweight synthetic resin and has a shape that can block exposure to outside air, so you can expose your face even when wearing a mask. It has the effect of reusing the mask by preventing contamination of the mask filter from germs caused by breathing through the mouth of a general mask.
  • FIG. 1 is a schematic external configuration diagram of a reusable mask according to an embodiment of the present invention.
  • FIG. 2 is a schematic internal configuration diagram of an embodiment of a reusable mask of the present invention.
  • FIG. 3 is a schematic exploded configuration diagram of an embodiment of a reusable mask according to the present invention.
  • FIG. 4 is a schematic configuration diagram of an embodiment in which a UV-C LED germicidal lamp is installed in a filter support frame member, which is a main part of the reusable mask of the present invention.
  • FIG. 5 is a configuration diagram related to an embodiment of combining and separating the upper and lower portions of a reusable mask body according to the present invention.
  • FIG. 6 is a configuration diagram of an embodiment of a hanging member of a reusable mask according to the present invention.
  • FIG. 1 is a schematic external configuration diagram of a reusable mask according to an embodiment of the present invention.
  • 3 is a schematic exploded configuration diagram of an embodiment of a reusable mask according to the present invention.
  • the reusable mask of the present invention covers the nose and mouth of the wearer and has a face shape made of a transparent synthetic resin material, and includes an upper part 100 and a mouth covering the nose, respectively.
  • a mask portion (A) composed of a lower portion 110 that surrounds the upper portion and having left and right mask-side through holes 111 and 112 formed to attach and detach the air distribution pipe at predetermined positions on both sides of the upper portion;
  • An upper part and a lower part of the mask part (A) are attached to the surface of the mask part (A) in a detachable manner to block exposure of the wearer's mouth and nose to the external gaze from the transparent mask part (A).
  • Left and right air distribution pipes 400 and 410 having a predetermined length connected to both mask side through holes of the upper part 100 of the mask part A; One ends are fixed to the mask-side through-holes 111 and 112, and the other ends are coupled to one end of the air distribution pipes 400 and 410, respectively, to form the air distribution pipes 400 and 410 through the mask-side through-holes 111.
  • Left and right connectors 300 and 310 connected by 112; Filter-side through-holes 511 and 512 connected to the ends of the left and right air distribution pipes 400 and 410 are formed on both sides.
  • FIG. 6 shows that the air distribution tubes 400 and 410 are inserted into the hanging members 400a and 410a, and the strap 420 is fixed to the back of the neck in a state in which the hanging members 400a and 410a and the strap 420 are coupled. It includes hook members 400a and 410a on both sides that can be fixed so that the mask does not move when worn and can be moved to the face so that it can be separated from the face without causing ear pain when worn for a long time.
  • a filter supporting frame member 500 having a predetermined width and length and having an arch shape and having two openings
  • a filter cover frame member 600 made of synthetic resin having a shape corresponding to the filter support frame member 500 and having a plurality of hexagonal ventilation portions
  • a thin HEPA filter (not shown) is attached to the inner surface of the filter support frame member 500 and the filter support frame member 500 is covered with the filter cover frame member 600.
  • the HEPA filter and the filter cover frame member 600 are fixed, and the filter cover frame member 600 can be separated when the HEPA filter is replaced, and two openings are formed on the front surface of the filter support frame member, and the openings are Exhaust valve frame members 700a and 710a are inserted and exhaust valve protective covers 711 and 712 in a state where the exhaust valves 700 and 710 that open and close when the wearer breathes are inserted and fixed. .
  • the left and right connecting pipes 300 and 310, the filter support frame member 500, the filter cover frame member 600, the exhaust valve frame members 700a and 710a, the exhaust valves 700 and 710, and the exhaust valves The configuration of the embodiment of the protective cover 711, 712 can be clearly understood from the exploded configuration diagram of FIG.
  • FIG. 5(A) shows three concavo-convex coupling parts on the upper and lower parts of the mask body, so that the upper part 100 can be easily combined with and separated from the lower mask even when the mask is worn.
  • FIG. 5 (B) is a configuration diagram of the lower part 110 concavo-convex coupling part, and in order to combine the upper and lower parts of the mask, the lower frontal concavo-convex coupling part 121a is hung on the upper front convex-convex coupling part 121 and the mask After pressing the concave-convex coupling portions 120a and 122a on both sides of the lower part into the mask, insert them and fix them to the concave-convex coupling portions 120 and 122 of the upper part of the mask. Separation is done in the reverse order of conjugation.
  • FIG. 2 is a schematic internal configuration diagram of an embodiment of a reusable mask of the present invention.
  • the reusable mask of the present invention is made of a transparent synthetic resin material and has a face shape, and is formed so that the upper part 100 covering the nose part and the lower part 110 covering the mouth part are separated, and the lower part A bottom surface 140 is formed on the 110, and a valve member 141 installed on the bottom surface 140 of the lower part to discharge the air exhaled through the mouth to the outside through a droplet blocking filter, each covering the nose Left and right mask-side through holes 111 and 112 formed at predetermined positions on both sides of the upper part 100 so that the air distribution pipe can be attached or detached;
  • the mask lower part 110 attaching to the surface of the mask part A to cover a part of the upper part 100 and the lower part 110 of the mask part A so that the skin member 200 is detachably fastened. It is a configuration of an embodiment of the inside of the mask portion (A) including at least one skin fastener 131, 132, 133, 134 formed on both sides of the.
  • the inner rim of the mask part (A) may be configured to be finished with a soft silicone material so that the fit and airtightness are good.
  • FIG. 4 is a schematic configuration diagram of an embodiment in which a UV-C LED germicidal lamp is installed in a filter support frame member, which is a main part of the reusable mask of the present invention.
  • filter side through-holes 511 and 512 formed at the lower left and right sides of the embodiment of the filter supporting frame member 500 having an arch shape according to the present invention, and a filter fixing frame having a predetermined width having an arch shape ( 520) are arranged in the edge direction of the filter support frame member 500, and the inner space of the filter fixing frame 520 is a configuration of ventilation holes 530 through which air is introduced and discharged.
  • the HEPA filter not shown may be configured to be attached to and positioned on the filter fixing frame 520 of the filter support frame member 500, and to filter air introduced or discharged through the ventilation hole 530.
  • the inside of the filter supporting frame member 500 may have a predetermined width in the longitudinal direction.
  • a circuit board 810 for controlling on/off of a UV-C LED lamp for example, is fixedly installed on the edge of the filter support frame member 500 and is electrically connected to the circuit board 810. At least one UV-C LED germicidal lamp 800 may be installed.
  • a rechargeable power supply or a battery may be coupled to the circuit board 810 .
  • the reusable mask of the present invention can be configured to be assembled and disassembled as shown in FIG. 3 so that the wearer can easily carry and clean each component for cleanliness.
  • the wearer inserts one side of the connection pipe 300 or 310 into the through hole 111 or 112 on the mask side of the mask part A and connects one end of the air distribution pipe 400 or 410 to the other side.
  • the other end of the air distribution pipe 400 or 410 is inserted into the filter side through hole 511 or 512 of the filter support frame member 500 and connected.
  • the air distribution tubes 400 and 410 may be configured to select or adjust their lengths.
  • the prepared new HEPA filter is fixed and attached to the filter fixing frame 520 of the filter support frame member 500.
  • the size of the HEPA filter may be provided to cover the filter fixing frame 520 inside the filter support frame member 500.
  • the filter cover frame member 600 With the HEPA filter fixed and positioned on the filter fixing frame 520, the filter cover frame member 600 is inserted into the filter support frame member 500 so that the filter support frame member 500, the HEPA filter and The filter cover frame member 600 is integrated. Subsequently, the exhaust valve frame members 700a and 710a are inserted into the front two openings of the filter supporting frame member 500, and the exhaust valves 700 and 710 are placed in the center of the exhaust valve frame member 700a and 710a. After insertion and fixation, the exhaust valve protective covers 711 and 712 are inserted to complete the combination of the air filter function parts.
  • the wearer After turning on the UV-C LED germicidal lamp installed inside the filter support frame member 500, the wearer wears the mask part (A) on the face and the hanging member coupled to the air distribution pipe 400 or 410 (400a) (410a) and the strap 420 are coupled, the strap 420 and the air filter unit are fixed to the back of the neck as in the case of wearing a necklace, and the connection pipe 300 connected to the distribution tubes 400 and 410 (310) is inserted into both sides of the mask upper part (100) through the mask side through holes (111, 112), and then the hook member (400a) (410a) is moved to the face part and fixed so that the mask part (A) cannot be moved. Wearing of a reusable mask is completed.
  • the lighting of the UV-C LED germicidal lamp 800 can be selected according to the usage environment, and when the on/off control mechanism of the UV-C LED germicidal lamp 800 is configured to be separately carried by the wearer, it is not worn. After completion, the on/off of the UV-C LED germicidal lamp 800 can be controlled when necessary.
  • valve member 141 of the lower bottom surface 140 can block the user's droplets by inserting the droplet blocking filter and then fixing it with a fixing ring.
  • replacing the air filtration filter is the reverse order of assembling the air filter function part, when the filter cover frame member 600 is separated from the filter support frame member 500, the HEPA The filter can be separated.
  • Exhaust valves 700 and 710 are formed on the inside of the exhaust valve protective covers 711 and 712, so that they are closed when external air is introduced and open when internal air is discharged as the wearer breathes. It can be configured to perform a function.
  • the embodiments of the present invention described above are only some of various embodiments of the present invention.
  • the embodiment of the present invention is not limited to the above, and the air filter function and the external air exposure blocking function of the lower part of the face are separated, and a UV-C LED germicidal lamp is used in the air filter function part. It is installed to sterilize the air passing through the air filter function part, and the external blocking function part of the lower part of the face is a transparent light material and reuses a shape that can block exposure of the lower part of the face to outside air. It is natural that various modified examples included in the technical concept of the mold mask are included in the protection scope of the present invention.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Pulmonology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Zoology (AREA)
  • Epidemiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

La présente invention concerne un masque réutilisable comprenant : une partie masque ayant une partie nez et une partie bouche séparées l'une de l'autre ; des tuyaux d'écoulement d'air gauche/droit reliés à des trous traversants des deux côtés de la partie de masque, et ayant une longueur prédéterminée ; un élément de maintien auquel les tuyaux d'écoulement d'air sont reliés ; et un couvercle de protection de plaque d'échappement auquel sont fixés un élément de cadre de support de filtre et un filtre HEPA.
PCT/KR2022/008664 2021-06-20 2022-06-20 Masque réutilisable WO2022270834A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020210079686A KR102393690B1 (ko) 2021-06-20 2021-06-20 재사용형 마스크
KR10-2021-0079686 2021-06-20

Publications (1)

Publication Number Publication Date
WO2022270834A1 true WO2022270834A1 (fr) 2022-12-29

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Application Number Title Priority Date Filing Date
PCT/KR2022/008664 WO2022270834A1 (fr) 2021-06-20 2022-06-20 Masque réutilisable

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KR (1) KR102393690B1 (fr)
WO (1) WO2022270834A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111408079A (zh) * 2020-04-27 2020-07-14 张一鸣 一种防护消毒装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102393690B1 (ko) * 2021-06-20 2022-05-02 이대용 재사용형 마스크
KR102676904B1 (ko) 2023-06-15 2024-06-19 양원석 Uv-c를 이용한 살균기능이 구비된 교체형 마스크 어셈블리

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WO2009145992A1 (fr) * 2008-04-04 2009-12-03 3M Innovative Properties Company Dispositifs de filtration d’air
KR20160127637A (ko) * 2015-04-27 2016-11-04 이운경 온기공급기능을 구비한 마스크
KR101797071B1 (ko) * 2017-02-16 2017-12-12 (주)대현엔텍 웨어러블 공기청정 마스크
KR101870225B1 (ko) * 2017-01-18 2018-06-22 (주)바이오융합기술 스마트 마스크
KR20210000561A (ko) * 2019-06-25 2021-01-05 주식회사 크리자인 기능성 마스크
KR20210086584A (ko) * 2021-06-20 2021-07-08 이대용 재사용형 마스크

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KR101130621B1 (ko) 2009-11-30 2012-04-02 기창도 발광다이오드 자외선램프를 이용한 공기살균기형 마스크
KR102124175B1 (ko) 2018-04-11 2020-06-17 김진향 마스크형 공기청정 시스템
KR102090117B1 (ko) 2018-08-07 2020-03-17 주식회사 한진지티씨 영역분리구조를 갖는 배기정화형 공기 청정 마스크

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Publication number Priority date Publication date Assignee Title
WO2009145992A1 (fr) * 2008-04-04 2009-12-03 3M Innovative Properties Company Dispositifs de filtration d’air
KR20160127637A (ko) * 2015-04-27 2016-11-04 이운경 온기공급기능을 구비한 마스크
KR101870225B1 (ko) * 2017-01-18 2018-06-22 (주)바이오융합기술 스마트 마스크
KR101797071B1 (ko) * 2017-02-16 2017-12-12 (주)대현엔텍 웨어러블 공기청정 마스크
KR20210000561A (ko) * 2019-06-25 2021-01-05 주식회사 크리자인 기능성 마스크
KR20210086584A (ko) * 2021-06-20 2021-07-08 이대용 재사용형 마스크

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111408079A (zh) * 2020-04-27 2020-07-14 张一鸣 一种防护消毒装置

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KR102393690B1 (ko) 2022-05-02
KR20210086584A (ko) 2021-07-08

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