EP3723575A1 - Automatic and currentless dirt remover - Google Patents
Automatic and currentless dirt removerInfo
- Publication number
- EP3723575A1 EP3723575A1 EP18825573.1A EP18825573A EP3723575A1 EP 3723575 A1 EP3723575 A1 EP 3723575A1 EP 18825573 A EP18825573 A EP 18825573A EP 3723575 A1 EP3723575 A1 EP 3723575A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dirt
- remover
- absorbing
- receiving
- shaped
- 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.)
- Granted
Links
- 239000002689 soil Substances 0.000 claims description 18
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000000844 anti-bacterial effect Effects 0.000 claims description 5
- 229920000704 biodegradable plastic Polymers 0.000 claims description 4
- 239000004952 Polyamide Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 229920002647 polyamide Polymers 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims 1
- 230000033001 locomotion Effects 0.000 description 17
- 238000004140 cleaning Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 3
- 241000208125 Nicotiana Species 0.000 description 2
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010146 3D printing Methods 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L25/00—Domestic cleaning devices not provided for in other groups of this subclass
- A47L25/005—Domestic cleaning devices not provided for in other groups of this subclass using adhesive or tacky surfaces to remove dirt, e.g. lint removers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B6/00—Cleaning by electrostatic means
Definitions
- the invention relates to an automatic and de-energized dirt remover for collecting dirt from the environment of the dirt remover.
- Electroless dirt removers are known in the art which remove dirt from surfaces such as lint or lint from textiles. Such electroless dirt removers are also referred to as lint rollers.
- the lint rollers have a handle that can be grasped by a person to operate the lint roller.
- the lint roller usually also has a roller, which consists of a sticky material or provided with an adhesive layer.
- the person leads the lint roller, in particular the sticky roller over the surface to be cleaned, so that the dirt located on the surface adheres to the roller.
- the collected debris can be removed or removed from the surface of the roller afterwards.
- the lint rollers are reciprocated by the user by the movement of the handle over the surface to be cleaned, so that an active actuation of the lint roller by the respective user is necessary to clean the surface.
- the lint rollers known from the prior art are only suitable to clean relatively large or easily accessible surfaces, as they are not used because of their size in hard to reach places or bottlenecks, for example in a bag or a handbag can.
- the object of the invention is to provide an electroless dirt remover, which can automatically collect dirt, especially in hard to reach places.
- an automatic and de-energized dirt remover for collecting dirt from the environment the soil remover, comprising a soil collecting body and a rollable casing body defining a receiving space in which the soil receiving body is received, the casing body being latticed and having openings to provide access from the outside to the soil receiving body having a surface, which absorbs the dirt.
- the basic idea of the invention is that the dirt remover can move autonomously, since the sheath body, which represents the outer sheath of the dirt remover, is rollable. This ensures that the Schmutzentferner can move automatically according to the shell body, in particular can roll. Since the sheath body has multiple openings and the dirt-receiving body is disposed in the lattice-shaped sheath body, the dirt-receiving body can interact via the openings in the sheath body with the environment of the dirt remover to absorb the dirt there.
- the dirt may be lint, dust, sand, tobacco, crumbs or the like.
- the automatic and de-energized dirt remover is dimensioned such that it can be used for example in bags, handbags, camera bags, suitcases, backpacks, culture bags and / or satchels to clean them accordingly, so generally in a container.
- the automatic and de-energized dirt remover can therefore be used in particular where a movement is initiated by the user of the dirt remover, for example by its own movement, which is transmitted via the corresponding pocket on the dirt remover, so that the dirt remover is de-energized.
- the object is achieved by the use of the automatic and de-energized Schmutzentferners in a container, for example in a bag, a handbag, a camera bag, a suitcase, a backpack, a toiletry bag and / or a satchel.
- a container for example in a bag, a handbag, a camera bag, a suitcase, a backpack, a toiletry bag and / or a satchel.
- the dirt remover for example when carrying the container, a corresponding automatic and de-energized cleaning.
- the surface of the dirt-absorbing body is designed to attract dirt, in particular is statically charged and / or adhesive, for example provided with at least one adhesive layer.
- the dirt present on the surface to be cleaned can be attracted to the dirt-absorbing body, in particular its surface, wherein the dirt then adheres to the surface of the dirt-receiving body.
- This can be done by chemical or electromagnetic adhesion.
- the surface of the dirt-receiving body may be structured to provide mechanical adhesion as well.
- the dirt-absorbing body may be completely formed on an adhesive material.
- the surface of the soil-receiving body may comprise at least one adhesive layer applied to an otherwise non-adherent core.
- a plurality of layers of adhesive layers can be provided, which can be removed individually, for example, in particular if the adhesive effect of the outer adhesive layer no longer exists.
- the dirt-removing effect of the soil remover can be easily recovered by removing the outer (used) adhesive layer, so that a new (unused) adhesive layer of the multi-layer structure represents the new outer adhesive layer.
- the dirt-absorbing body is accommodated in the receiving space in such a way that the dirt-absorbing body can move relative to the lattice-shaped casing body.
- the dirt-absorbing body can make a proper movement. Due to the relative movement of the dirt-absorbing body within the shell body can drive the dirt remover by its pulse is transmitted. Furthermore, so the entire surface of the dirt-absorbing body can be active.
- the dirt-absorbing body in particular its surface, can press on the surface to be cleaned due to the force of gravity, So through the openings in the lattice-shaped shell body. This makes it possible to achieve a better cleaning effect.
- the dirt-receiving body is a ball.
- the shell body may also be a ball. If both the dirt-absorbing body and the shell body are formed as a ball, it is ensured that the dirt remover can move freely over the shell body in all directions. It is also possible that the dirt-absorbing body can move freely within the casing body, so that a particularly good cleaning is possible because of a high degree of freedom in terms of movement is given. The dirt remover can thus roll in all directions to collect the dirt from the environment.
- the dirt remover itself can therefore be designed as a ball, so that the automatic and de-energized dirt remover can also be referred to as an automatic and de-energized dirt ball.
- both the dirt-absorbing body and the sheath body can each be designed as a cylinder, in particular a circular cylinder.
- About the lateral surface of the cylinder is also ensured that the dirt remover can roll over the shell body.
- the dirt-absorbing body accommodated in the casing body can thereby move relative to the casing body.
- the dirt remover itself can have a total of a cylindrical shape.
- the dirt remover can get into corners particularly well, namely in the transition region of its cylindrical lateral surface to the base surface or surface.
- a further aspect provides that the inner surface of the casing body provides a rolling contour for the dirt-receiving body, along which the dirt-absorbing body rolls during the automatic dirt removal. If the casing body and the dirt-absorbing body are each formed as a ball, there is a correspondingly high degree of freedom with respect to the rolling movement of the dirt-absorbing body on the Inner surface of the shell body.
- the rolling contour can also have a guide for the dirt-absorbing body.
- the casing body and the dirt-absorbing body are each designed as cylinders, at least one rolling contour results along the inside of the casing surface of the casing body. Again, a corresponding relative movement is possible.
- the dirt-receiving body has at least one core which has a higher density than the rest of the dirt-receiving body and / or the shell body. This makes it possible that the dirt-absorbing body is formed heavier, whereby a proper movement of the dirt-absorbing body is promoted. Once the dirt-absorbing body is in motion, it can drive the lattice-shaped casing body particularly well by moving over the rolling contour on the inner surface of the casing body.
- the lattice-shaped sheath body has a honeycomb structure, wherein the openings are honeycomb-shaped.
- a particularly favorable ratio is given with regard to the cleaning surface formed by the openings and the stability of the casing body, since the total area of the openings (cleaning surface) is maximized for a given rigidity of the casing body. Accordingly, the cleaning ability of the soil remover is maximized, while the stability of the soil remover is not impaired, in particular that of the lattice-shaped casing body which constitutes the outer shell of the soil remover.
- the surface of the soil-receiving body and / or the surface of the lattice-shaped body is / are antibacterial.
- the dirt-absorbing body and / or the shell body are made of a plastic, a biodegradable plastic, a silicone, a polyamide, a rubber, a ceramic and / or a metal. These materials are particularly well suited for the intended Use of the dirt remover, since they can be provided on the one hand cost and also have a long service life.
- the biodegradable plastic is suitable for a soil remover which is formed as a disposable (waste-neutral) article.
- the dirt remover may be a disposable item.
- a further embodiment provides that the casing body is designed in several parts, so that the casing body can be opened, in particular wherein the at least two casing body parts are connected to one another via at least one connecting means. Accordingly, the dirt remover is made reusable, since the shell body can be opened to replace the dirt-receiving body, if it is used or its dirt-absorbing capacity is impaired.
- the connecting means may be a thread, a press fit, a groove and / or a projection, over which the at least two casing body parts can be separated.
- the casing body is formed in one piece, wherein it can still be opened by the casing body has at least two mutually adjustable casing body sections.
- the at least two shell body sections can be coupled to one another via a hinge, wherein the hinge is formed integrally with the shell body sections.
- the hinge may be a living hinge.
- the automatic cleaning or the automatic dirt remover is guaranteed because the user does not have to manually operate the dirt remover to achieve the cleaning effect or collect the dirt.
- FIG. 1 is a perspective view of a dirt remover according to the invention
- - Figure 2 is a schematic sectional view of a dirt-receiving body of a dirt remover according to the invention.
- FIG. 1 an automatic and de-energized dirt remover 10 is shown, which is provided for collecting dirt from the environment of the dirt remover 10.
- the Schmutzentferner 10 has a lattice-shaped shell body 12 which is formed as a ball.
- the lattice-shaped shell body 12 is rollable, since it can roll over its outer spherical surface.
- the shell body 12 defines the outer geometry of the dirt remover 10, so that this also has a spherical shape.
- the grid-shaped casing body 12 has openings 14, which are honeycomb-shaped in the embodiment shown.
- the grid-shaped shell body 12 has a grid 16 which forms the corresponding edges of the openings 14.
- the grid 16 is therefore honeycomb-shaped.
- the shell body 12 has a curved honeycomb structure due to its spherical shape.
- the shell body 12 defines a receiving space 18 having the volume of a sphere.
- a dirt-absorbing body 20 is received, which is also formed as a ball.
- the ball diameter of the dirt-receiving body 20 is smaller than the diameter of the spherical shell body 12, so that the dirt-absorbing body 20 can move freely within the receiving space 18, ie relative to the shell body 12th
- the dirt-absorbing body 20 has a surface 22 which is accessible via the openings 14 from the outside.
- the surface 22 of the dirt-receiving body 20 is generally dirt-attracting, so that dirt from the environment of the soil remover 10 accumulates on the surface 22 of the dirt-receiving body 20.
- the dirt-absorbing effect of the dirt-absorbing body 20 can be achieved in that the surface 22 is adhesive, that is formed from an adhesive material.
- the surface 22 is provided with at least one adhesive layer, whereby the dirt-absorbing Body 20 is adhesive.
- there is a chemical adhesion In general, several layers of adhesive layers can be provided.
- At least the surface 22 of the dirt-absorbing body 20 is charged (electro-) statically in order to obtain the dirt-attracting effect. This corresponds to an electromagnetic adhesive effect.
- the surface 22 may alternatively or additionally be structured so that a mechanical adhesion effect results over the structuring.
- the surface 22 of the dirt-receiving body 20 may also be antibacterial, so that the dirt-absorbing body 20 at the same time has a hygienic effect.
- the surface 24 of the latticed shell body 12 may be formed antibacterial, since the surface 24 of the lattice-shaped shell body 12 also comes into contact with the environment to also act antibacterial.
- the dirt remover 10 can generally be used in hard to reach places, for example for cleaning bags, handbags, camera bags, suitcases, backpacks, culture bags and / or satchels.
- the spherical dirt remover 10 rolls over its spherical and latticed shell body 12 along the surfaces of the container to be cleaned, in which the dirt remover 10 is arranged.
- the surface 22 of the dirt-receiving body 20 comes through the openings 14 of the casing body 12 in contact with the surfaces to be cleaned in order to collect the dirt present there.
- the dirt to be collected may be lint, dust, sand, tobacco, crumbs or the like. In any case, the dirt to be collected from the surface 22 of the Dirt-absorbing body 20 is attracted and stick to the surface 22.
- the ball-shaped dirt-absorbing body 20 has a smaller diameter than the shell body 12, it is ensured that the dirt-absorbing body 20 can roll on the inner surface 26 of the shell body 12 as the soil remover 10 moves.
- the inner surface 26 of the casing body 12 forms a rolling contour 28 for the dirt-absorbing body 20 during the automatic dirt removal, so that a relative movement between the casing body 12 and the dirt-absorbing body 20 is ensured.
- the dirt-receiving body 20 may have a core 30 which has a higher density than the remainder 32 of the dirt-receiving body 20.
- the dirt-absorbing body 20, which is received in the shell body 12 serve as a mechanical drive for the dirt remover 10 due to its inertial mass, provided that the spherical dirt-absorbing body 20 has been set in motion.
- the dirt-absorbing body 20 then rolls along the rolling contour 28 formed by the inner surface 26 of the shell body 12 to move the shell body 12 and thus the entire soil remover 10 in motion.
- the density of the dirt-absorbing body 20, in particular of the core 30, can also be higher than the density of the casing body 12.
- the dirt-absorbing body 20 and / or the shell body 12 may be formed of a plastic, a biodegradable plastic, a silicone, a polyamide, a rubber, a ceramic and / or metal. These materials are particularly suitable for the preparation of the dirt remover 10.
- the shell body 12 can subsequently be produced in a 3D printing process around the dirt-absorbing body 20, so that it is accommodated in the shell body 12.
- the dirt-absorbing body 20 may first be provided with a film or the like, according to peeled off the production of the shell body 12 to release the dirt-attracting or tacky surface 22.
- the soil remover 10 may also have a (circular) cylindrical shaped shell body 12 and a (circular) cylindrical shaped dirt-receiving body 20, so that they allow a rolling movement in one dimension, namely along the lateral surface (s). Such a dirt remover 10 is therefore also substantially (circular) cylindrical. Such a dirt remover 10 is particularly suitable for cleaning corner areas.
- the Schmutzentferner 10 may have a multi-part shell body 12 having two Hüllen redesignmaschine, which are connected to each other via at least one connecting means.
- connection means is a thread which is formed correspondingly on both casing body parts.
- a groove and a projection may be provided which engage with each other to couple the two body parts together.
- the at least two casing body parts can be coupled to one another via a press fit or a form fit.
- the opening of the casing body 12 can also be provided by an integrally formed casing body 12, which has at least two casing body portions, which are coupled to one another via a coupling element, for example a (film) hinge.
- the coupling element and the shell body sections are integrally coupled with each other.
- the shell body sections can be coupled to each other via a press fit or a form fit, via which the shell body 12 can be opened accordingly.
- the openings 14 of the latticed casing body 12 may have other shapes besides the honeycomb form shown in Figure 1, for example, the openings 14 may be round, oval, triangular, square or polygonal.
- the container may be a bag, a handbag, a camera bag, a suitcase, a backpack, a toiletry bag and / or a satchel ,
Landscapes
- Cleaning In General (AREA)
- Cleaning Implements For Floors, Carpets, Furniture, Walls, And The Like (AREA)
- Brushes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102017129642.5A DE102017129642A1 (en) | 2017-12-12 | 2017-12-12 | Automatic and de-energized dirt remover |
PCT/EP2018/083812 WO2019115348A1 (en) | 2017-12-12 | 2018-12-06 | Automatic and currentless dirt remover |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3723575A1 true EP3723575A1 (en) | 2020-10-21 |
EP3723575B1 EP3723575B1 (en) | 2021-06-16 |
Family
ID=64755497
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18825573.1A Active EP3723575B1 (en) | 2017-12-12 | 2018-12-06 | Automatic and currentless dirt remover |
Country Status (9)
Country | Link |
---|---|
US (2) | US11432703B2 (en) |
EP (1) | EP3723575B1 (en) |
JP (1) | JP6975334B2 (en) |
KR (3) | KR20200098610A (en) |
CN (1) | CN111479492A (en) |
CA (1) | CA3083670C (en) |
DE (1) | DE102017129642A1 (en) |
ES (1) | ES2880452T3 (en) |
WO (1) | WO2019115348A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD1045302S1 (en) * | 2020-09-22 | 2024-10-01 | Peter Trossowski | Laundry ball |
Family Cites Families (24)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS60132259U (en) | 1984-02-15 | 1985-09-04 | 帯川 和幸 | Dust removal tool made of adhesive material |
US4920662A (en) * | 1988-10-11 | 1990-05-01 | Seeburger James W | Lint remover for tumble-dryer |
JP3004812U (en) | 1994-05-31 | 1994-11-29 | 関東産業有限会社 | Storage and storage basket for adsorbents |
JP3907813B2 (en) | 1997-01-24 | 2007-04-18 | フマキラー株式会社 | Drug holding body and drug transpiration method |
JPH10262881A (en) | 1997-03-26 | 1998-10-06 | Kimiwaka Aikawa | Ball for cleaning |
US6174577B1 (en) * | 1998-08-12 | 2001-01-16 | Tony Vitorino | Anti-static ball and a method of using the same |
JP2002331190A (en) | 2001-05-08 | 2002-11-19 | Fujio Sakamoto | Washing dust capturing tool |
SE526193C2 (en) * | 2004-01-22 | 2005-07-26 | Lars-Olof Lundgren | cleaning Machine |
CN2726518Y (en) | 2004-08-30 | 2005-09-21 | 天津市中环三峰电子有限公司 | Water scale cleaning ball |
US20060054187A1 (en) * | 2004-09-14 | 2006-03-16 | Bradford Morse | A Method and Apparatus for self-propelled cleaning |
US7441345B2 (en) | 2005-06-07 | 2008-10-28 | Ken Taylor | Laundering aid removing adherent matter from fabric articles |
US7757334B2 (en) | 2005-12-21 | 2010-07-20 | 3M Innovative Properties Company | Floor cleaning system |
US20100306933A1 (en) * | 2009-06-08 | 2010-12-09 | Ussen Bakhytbek Z | Self-rolling cleaning device |
JP2011050709A (en) | 2009-09-01 | 2011-03-17 | Misae Tsunematsu | Lint sticking ball for electric washing machine |
CN201591535U (en) | 2009-10-22 | 2010-09-29 | 石育祯 | Cleaning roller |
US8984697B2 (en) | 2011-06-01 | 2015-03-24 | S.C. Johnson & Son, Inc. | Quick pickup device for debris on any surface with positive capture |
CN202426488U (en) | 2012-01-04 | 2012-09-12 | 林基钰 | Cleaning rotary drum |
CN102860807A (en) | 2012-10-18 | 2013-01-09 | 天津市中环三峰电子有限公司 | Scale cleaning ball |
KR101586375B1 (en) | 2014-07-10 | 2016-01-18 | 주식회사 수면과건강 | Fine dust filter to improve nasal breathing give expander |
CN204744081U (en) | 2015-07-22 | 2015-11-11 | 淮南师范学院 | Simply inhale service |
US20170055807A1 (en) * | 2015-08-31 | 2017-03-02 | Bradley M. C. Rucki | Devices and Methods for Adhesive-Based Removal of Pet Hair, Lint or Other Debris Using a Tumble Dryer |
CN105212855B (en) | 2015-09-07 | 2017-10-03 | 李耀俊 | Hand-held electrostatic dust catcher |
USD833698S1 (en) * | 2017-03-16 | 2018-11-13 | Razalia Project Incorporated | Microfiber catcher ball |
KR101964676B1 (en) | 2017-12-05 | 2019-04-03 | 김승제 | Antibacterial dust adsorption balls for vacuum cleaners |
-
2017
- 2017-12-12 DE DE102017129642.5A patent/DE102017129642A1/en not_active Withdrawn
-
2018
- 2018-12-06 CA CA3083670A patent/CA3083670C/en active Active
- 2018-12-06 CN CN201880080100.6A patent/CN111479492A/en active Pending
- 2018-12-06 JP JP2020531431A patent/JP6975334B2/en active Active
- 2018-12-06 KR KR1020207020066A patent/KR20200098610A/en not_active Application Discontinuation
- 2018-12-06 WO PCT/EP2018/083812 patent/WO2019115348A1/en unknown
- 2018-12-06 KR KR1020217002294A patent/KR102267110B1/en active IP Right Grant
- 2018-12-06 US US16/771,495 patent/US11432703B2/en active Active
- 2018-12-06 EP EP18825573.1A patent/EP3723575B1/en active Active
- 2018-12-06 ES ES18825573T patent/ES2880452T3/en active Active
- 2018-12-06 KR KR1020217007862A patent/KR102235835B1/en active IP Right Grant
-
2022
- 2022-07-18 US US17/867,413 patent/US11877712B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
ES2880452T3 (en) | 2021-11-24 |
CA3083670A1 (en) | 2019-06-20 |
CN111479492A (en) | 2020-07-31 |
KR102267110B1 (en) | 2021-06-21 |
JP6975334B2 (en) | 2021-12-01 |
CA3083670C (en) | 2021-09-21 |
WO2019115348A1 (en) | 2019-06-20 |
JP2021505373A (en) | 2021-02-18 |
KR20200098610A (en) | 2020-08-20 |
KR102235835B1 (en) | 2021-04-05 |
EP3723575B1 (en) | 2021-06-16 |
US11432703B2 (en) | 2022-09-06 |
KR20210011512A (en) | 2021-02-01 |
DE102017129642A1 (en) | 2019-06-13 |
US20210052133A1 (en) | 2021-02-25 |
KR20210033064A (en) | 2021-03-25 |
US11877712B2 (en) | 2024-01-23 |
US20220346626A1 (en) | 2022-11-03 |
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