WO2021024360A1 - 液体クロマトグラフ用検出器 - Google Patents
液体クロマトグラフ用検出器 Download PDFInfo
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- WO2021024360A1 WO2021024360A1 PCT/JP2019/030761 JP2019030761W WO2021024360A1 WO 2021024360 A1 WO2021024360 A1 WO 2021024360A1 JP 2019030761 W JP2019030761 W JP 2019030761W WO 2021024360 A1 WO2021024360 A1 WO 2021024360A1
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- Prior art keywords
- capillary
- light
- lens
- flow cell
- detector
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/74—Optical detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
- G01N21/05—Flow-through cuvettes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N2030/022—Column chromatography characterised by the kind of separation mechanism
- G01N2030/027—Liquid chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/62—Detectors specially adapted therefor
- G01N30/74—Optical detectors
- G01N2030/746—Optical detectors detecting along the line of flow, e.g. axial
Definitions
- the present invention relates to a detector for a liquid chromatograph.
- a general flow cell used in a detector such as an absorptiometry detector has a flow path through which a sample flows in a block made of a material having chemical resistance such as SUS316.
- SUS316 chemical resistance
- a block-type flow cell if the inner diameter of the flow path inside the cell is reduced, the cross-sectional area of the flow path through which light passes becomes small, and the frequency of light scattering on the wall surface of the cell also increases. As a result, the S / N deteriorates.
- a flow cell (also referred to as a light guide cell) in which the flow path through which the sample flows is composed of a linear thin capillary can be used (see Patent Document 1).
- the light incident on one end of the capillary is totally reflected at the interface between the outer peripheral wall surface of the capillary and the air layer around the capillary, and propagates to the other end of the capillary.
- both ends of the capillary are held by holding members such as ferrules.
- the incident light on the light guide cell also enters the interface between the capillary and the holding member.
- the reflectance of the light guide which consists of the capillary and the sample flowing inside the capillary, changes depending on the difference in the refractive index between the sample flowing in the capillary and the holding member in contact with the capillary.
- the refractive index of the sample is constant, but in gradient analysis in which the composition of the mobile phase changes over time, the refractive index of the sample flowing through the capillary changes over time, so the amount of light emitted from the capillary changes over time.
- the baseline of the detector signal fluctuates. Such a phenomenon is called a refractive index effect.
- the object of the present invention is to suppress the fluctuation of the baseline due to the refractive index effect.
- the detector for a liquid chromatograph has a light source, a linear capillary that defines a flow path for flowing a sample liquid, a holding member that holds one end of the capillary, and light incident on one end of the capillary.
- a flow cell having an incident port for allowing light to be emitted and an exit port for emitting light from the other end of the capillary, a condensing mirror for guiding light from the light source to the incident port of the flow cell, and the flow cell.
- a receiver for detecting the light emitted from the exit port is provided, and a lens is provided between the one end of the capillary of the flow cell and the condenser mirror, and the lens is the condenser mirror.
- the light in the central region near the optical axis is parallelized, and the first reflection position of the light in the central region is arranged so as to be away from the one end.
- parallelization means refracting light to reduce the tilt angle with respect to the optical axis.
- first reflection position of the light incident in the capillary is a position where the light incident in the capillary first enters and is reflected at the interface between the outer peripheral surface of the capillary and the air layer.
- the interface between the outer peripheral surface of the capillary and the holding member is formed by moving the first reflection position of the light in the central region near the optical axis from the condensing mirror toward the one end of the capillary away from one end of the capillary. Reduce the amount of light incident on.
- a lens is provided between one end of the capillary of the flow cell and the condensing mirror, and the lens is the light directed from the condensing mirror to the one end of the capillary. Since the first reflection position of the light in the central region near the optical axis is arranged so as to be away from the one end of the capillary, the amount of light incident on the interface between the outer peripheral surface of the capillary and the holding member is reduced. The fluctuation of the detector signal baseline during gradient analysis is suppressed.
- This is the first verification data of the influence of the lens of the same embodiment on the refractive index effect.
- the detector for liquid chromatography of this embodiment includes a light source 2, a focusing mirror 4, a flow cell 6, a mirror 8, a grating 10 and a receiver 12.
- the light emitted from the light source 2 is reflected by the focusing mirror 4 and focused on the incident port 20 (see FIG. 2) of the flow cell 6.
- the flow cell 6 is a guide light cell in which the flow path through which the sample liquid flows is formed by a linear capillary 14 (see FIG. 2).
- the positional relationship between the condensing mirror 4 and the flow cell 6 is set so that the optical axis of the light reflected by the condensing mirror 4 coincides with the central axis of the capillary 14 of the flow cell 6.
- the light incident on the incident port of the flow cell 6 passes through the capillary 14 and is emitted from the exit port 24 (see FIG. 2).
- the light emitted from the flow cell 6 is reflected by the mirror 8, passes through the slit 9, and is guided by the grating 10 to be decomposed into each wavelength component.
- the light of each wavelength component decomposed by the grating 10 is incident on a receiver 12 composed of, for example, a photodiode array, and the intensity of the light in each wavelength region is measured.
- the flow cell 6 includes a capillary 14, a housing 16, a holding member 18, a lens 28, and a window plate 30.
- the capillary 14 is made of quartz glass or the like, and has an outer diameter of, for example, 0.5 mm. Both ends of the capillary 14 are held by holding members 18 such as ferrules and are attached to the housing 16.
- the outer peripheral surface of the capillary 14 is in contact with the air layer except for both ends in contact with the holding member 18. Light incident on the capillary 14 from one end (left end in the figure) of the capillary 14 repeats total internal reflection at the interface between the outer peripheral surface of the capillary 14 and the air layer around it, and the other end of the capillary 14 (right end in the figure). Proceed to the side.
- the housing 16 is provided with an entrance port 20, an introduction flow path 22, an exit port 24, and a lead-out flow path 26.
- the entrance port 20 is an opening for injecting light into one end of the capillary 14, and the exit port 24 is an opening for taking out the light emitted from the other end of the capillary 14.
- the introduction flow path 22 is a flow path for introducing the sample water to one end of the capillary 14, and the lead-out flow path 24 is a flow path for leading the sample water that has passed through the capillary 14 to the outside.
- the entrance port 20 is sealed by the lens 28, and the exit port 24 is sealed by the flat window plate 30.
- An optical fiber may be inserted into the exit port 24 to emit light from the other end via the optical fiber.
- the lens 28 that seals the incident port 20 is fitted and attached to the recess 32 provided at the edge of the incident port 20 of the housing 16.
- the recess 32 is provided so as to share a central axis with the capillary 14.
- the outer diameter of the lens 28 and the inner diameter of the recess 32 are substantially the same, that is, the difference between the two is 1.13% or less of the outer diameter of the lens 28. Therefore, the center of the lens 28 fitted in the recess 32 is located on the central axis of the capillary 14.
- the lens 28 is a convex lens whose convex surface faces the condensing mirror 4 side.
- An example of the dimensions of the lens 28 is an outer diameter of 6 mm, a lens diameter of 4 mm, and a thickness of 2.3 mm.
- the surface of the lens 28 opposite to the convex surface is a flat surface, and has a side surface perpendicular to the flat surface. By having such a side surface, when the lens 28 is fitted into the recess 32, it is stably held by the recess 32.
- the lens 28 is located between the condensing mirror 4 and one end of the capillary 14, and is for parallelizing the light in the central region near the optical axis of the light directed from the condensing mirror 4 to one end of the capillary 14. Is. Parallelization here means reducing the tilt angle with respect to the optical axis.
- the central region is, for example, a region of 20% on the central side of the light flux of the light reflected by the condensing mirror 4.
- the lens 28 having a center is arranged on the optical axis of the light from the condensing mirror 4, the light in the central region is refracted by the lens 28 and parallelized.
- the position of first reflection (first reflection position) in the capillary 14 shifts to a position far from one end of the capillary 14. Therefore, the light in the central region of the light from the condenser mirror 4 is less likely to enter the interface between the outer peripheral surface of the capillary 14 and the holding member 18, and the total reflection efficiency in the capillary 14 is improved.
- the light in the outer region away from the center is refracted by the lens 28 to increase the inclination angle with respect to the optical axis, and the interface between the outer peripheral surface of the capillary 14 and the holding member 18 It is possible that the light is likely to be incident on the lens and the total reflection efficiency is deteriorated.
- the light from the light source 2 has a distribution in which the amount of light is larger in the central region, the effect of the deterioration of the total reflection efficiency in the capillary 14 of the light in the outer region of the luminous flux is the capillary of the light in the central region of the luminous flux. It is small compared to the effect of improving the total reflection efficiency within 14.
- the lens 28 is attached to the housing 16 and also functions as a window plate for sealing the incident window 20, but the present invention is not limited to this.
- the lens 28 may be provided so as to parallelize the light in the central region of the light from the condensing mirror 4 and keep the first reflection position away from one end of the capillary 14, and may be provided separately from the flow cell 6.
- FIG. 5 is measurement data showing the verification result of the influence of the lens 28 on the light transmission efficiency of the flow cell 6.
- the amount of light in each wavelength region detected by the receiver 12 was measured while flowing water in the capillary 14 of the flow cell 6.
- the embodiment solid line
- a flat plate-shaped window plate is attached to the incident window 20 instead of the lens 28. It is the measurement data obtained by using the flow cell.
- the amount of light in each wavelength region detected by the receiver 12 is larger in the example (solid line) than in the comparative example (broken line). That is, by providing the lens 28 between the condenser lens 4 and the capillary 14 and parallelizing the light in the central region of the light incident on the capillary 14, the total reflection efficiency in the capillary 14 is improved, and the flow cell 6 It has been shown that the amount of light transmitted through the lens increases.
- 6 and 7 are measurement data showing the verification results of the influence of the lens 28 on the refractive index effect, respectively. Similar to FIG. 5, the example is the measurement data obtained by using the flow cell 6 provided with the lens 28, and in the comparative example, a flat plate-shaped window plate is attached to the incident window 20 instead of the lens 28. It is the measurement data obtained by using the flow cell.
- solution A water
- solution B acetonitrile
- An embodiment of a detector for a liquid chromatograph includes a light source, a linear capillary that defines a flow path for flowing a sample liquid, a holding member that holds one end of the capillary, and one end of the capillary.
- a flow cell having an incident port for incident light and an exit port for emitting light from the other end of the capillary, a condensing mirror for guiding light from the light source to the incident port of the flow cell, and the above.
- a receiver for detecting the light emitted from the outlet of the flow cell is provided, and a lens is provided between the one end of the capillary of the flow cell and the condensing mirror.
- the light in the central region near the optical axis is parallelized, and the first reflection position of the light in the central region is arranged so as to be away from the one end.
- the flow cell has a housing, the housing is provided with the incident port, and the edge of the incident port of the housing shares a central axis with the capillary.
- the outer diameter of the lens and the inner diameter of the recess are substantially the same, and the center of the lens is positioned on the central axis of the capillary by fitting the lens into the recess. ing.
- the lens can be positioned with respect to the capillary. It is made accurate and easy, and the suppression of the refractive index effect by the lens can be effectively realized.
- the flow cell can be arranged so that the optical axis of the light reflected by the condensing mirror coincides with the central axis of the capillary. With such a positional relationship, it becomes easy to design the dimensions, shape, position, and the like of the lens for suppressing the refractive index effect.
- the lens is a convex lens whose convex surface faces the condensing mirror side.
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optical Measuring Cells (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
4 集光ミラー
6 フローセル
8 ミラー
10 グレーティング
12 受光器
14 キャピラリ
16 筐体
18 保持部材
20 入射口
22 導入流路
24 出射口
26 導出流路
28 レンズ
30 窓板
32 窪み
Claims (4)
- 光源と、
試料液を流すための流路を画する直線状のキャピラリ、前記キャピラリの一端部を保持する保持部材、前記キャピラリの一端へ光を入射させるための入射口及び前記キャピラリの他端から光を出射させるための出射口を有するフローセルと、
前記光源からの光を前記フローセルの前記入射口へ導くための集光ミラーと、
前記フローセルの前記出射口から出射した光を検出するための受光器と、を備え、
前記フローセルの前記キャピラリの前記一端と前記集光ミラーとの間にレンズが設けられており、前記レンズは、前記集光ミラーから前記キャピラリの前記一端へ向かう光のうち光軸付近の中心領域の光を平行化し、前記中心領域の光の第1反射位置を前記一端から遠ざけるように配置されている、液体クロマトグラフ用検出器。 - 前記フローセルは筐体を有し、前記筐体に前記入射口が設けられており、前記筐体の前記入射口の縁に前記キャピラリと中心軸を共有する円形の窪みが設けられており、前記レンズの外径と前記窪みの内径は実質的に同一であり、前記レンズが前記窪みに嵌め込まれることによって前記レンズの中心が前記キャピラリの中心軸上に位置している、請求項1に記載の液体クロマトグラフ用検出器。
- 前記フローセルは、前記集光ミラーで反射した光の光軸と前記キャピラリの中心軸とが一致するように配置されている、請求項2に記載の液体クロマトグラフ用検出器。
- 前記レンズは凸面が前記集光ミラー側を向く凸レンズである、請求項1に記載の液体クロマトグラフ用検出器。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201980098781.3A CN114174801B (zh) | 2019-08-05 | 2019-08-05 | 液相色谱仪用检测器 |
| JP2021538574A JP7226561B2 (ja) | 2019-08-05 | 2019-08-05 | 液体クロマトグラフ用検出器 |
| PCT/JP2019/030761 WO2021024360A1 (ja) | 2019-08-05 | 2019-08-05 | 液体クロマトグラフ用検出器 |
| US17/630,125 US12405255B2 (en) | 2019-08-05 | 2019-08-05 | Detector for liquid chromatograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2019/030761 WO2021024360A1 (ja) | 2019-08-05 | 2019-08-05 | 液体クロマトグラフ用検出器 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2021024360A1 true WO2021024360A1 (ja) | 2021-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| PCT/JP2019/030761 Ceased WO2021024360A1 (ja) | 2019-08-05 | 2019-08-05 | 液体クロマトグラフ用検出器 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12405255B2 (ja) |
| JP (1) | JP7226561B2 (ja) |
| CN (1) | CN114174801B (ja) |
| WO (1) | WO2021024360A1 (ja) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS63198867A (ja) * | 1987-02-14 | 1988-08-17 | Shimadzu Corp | アレイ型分光光度計検出器 |
| JPH03179240A (ja) * | 1989-09-29 | 1991-08-05 | Millipore Corp | 液体の吸光度を測定する装置 |
| JPH09264840A (ja) * | 1996-03-29 | 1997-10-07 | Tosoh Corp | 吸光度計 |
| JP3176582U (ja) * | 2012-03-19 | 2012-06-28 | 株式会社島津製作所 | ライトガイドセル |
| JP2012220324A (ja) * | 2011-04-07 | 2012-11-12 | Hitachi High-Technologies Corp | 長光路長フローセル |
| JP2013088412A (ja) * | 2011-10-24 | 2013-05-13 | Hitachi High-Technologies Corp | 液体クロマトグラフ用フローセル |
| JP2013120151A (ja) * | 2011-12-08 | 2013-06-17 | Hitachi High-Technologies Corp | フローセル及び液体分析装置 |
| JP2014041024A (ja) * | 2012-08-21 | 2014-03-06 | Shimadzu Corp | フローセル |
| JP2014044145A (ja) * | 2012-08-28 | 2014-03-13 | Shimadzu Corp | フローセル |
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2019
- 2019-08-05 WO PCT/JP2019/030761 patent/WO2021024360A1/ja not_active Ceased
- 2019-08-05 CN CN201980098781.3A patent/CN114174801B/zh active Active
- 2019-08-05 US US17/630,125 patent/US12405255B2/en active Active
- 2019-08-05 JP JP2021538574A patent/JP7226561B2/ja active Active
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| JPS63198867A (ja) * | 1987-02-14 | 1988-08-17 | Shimadzu Corp | アレイ型分光光度計検出器 |
| JPH03179240A (ja) * | 1989-09-29 | 1991-08-05 | Millipore Corp | 液体の吸光度を測定する装置 |
| JPH09264840A (ja) * | 1996-03-29 | 1997-10-07 | Tosoh Corp | 吸光度計 |
| JP2012220324A (ja) * | 2011-04-07 | 2012-11-12 | Hitachi High-Technologies Corp | 長光路長フローセル |
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| JP2013120151A (ja) * | 2011-12-08 | 2013-06-17 | Hitachi High-Technologies Corp | フローセル及び液体分析装置 |
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Also Published As
| Publication number | Publication date |
|---|---|
| US12405255B2 (en) | 2025-09-02 |
| CN114174801B (zh) | 2025-05-06 |
| CN114174801A (zh) | 2022-03-11 |
| JP7226561B2 (ja) | 2023-02-21 |
| US20220260535A1 (en) | 2022-08-18 |
| JPWO2021024360A1 (ja) | 2021-02-11 |
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