EP3311098B1 - Dual focal plane reticles for optical sighting devices - Google Patents

Dual focal plane reticles for optical sighting devices Download PDF

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Publication number
EP3311098B1
EP3311098B1 EP16812319.8A EP16812319A EP3311098B1 EP 3311098 B1 EP3311098 B1 EP 3311098B1 EP 16812319 A EP16812319 A EP 16812319A EP 3311098 B1 EP3311098 B1 EP 3311098B1
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EP
European Patent Office
Prior art keywords
reticle
focal plane
sighting device
optical sighting
reticles
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.)
Active
Application number
EP16812319.8A
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German (de)
English (en)
French (fr)
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EP3311098A4 (en
EP3311098A1 (en
Inventor
David M. Hamilton
Samuel J. Hamilton
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Sheltered Wings Inc
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Sheltered Wings Inc
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Filing date
Publication date
Priority claimed from US14/742,415 external-priority patent/US10900745B2/en
Application filed by Sheltered Wings Inc filed Critical Sheltered Wings Inc
Priority to EP21171283.1A priority Critical patent/EP3875885A1/en
Publication of EP3311098A1 publication Critical patent/EP3311098A1/en
Publication of EP3311098A4 publication Critical patent/EP3311098A4/en
Application granted granted Critical
Publication of EP3311098B1 publication Critical patent/EP3311098B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G1/00—Sighting devices
    • F41G1/32—Night sights, e.g. luminescent
    • F41G1/34—Night sights, e.g. luminescent combined with light source, e.g. spot light
    • F41G1/345—Night sights, e.g. luminescent combined with light source, e.g. spot light for illuminating the sights
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G1/00—Sighting devices
    • F41G1/38—Telescopic sights specially adapted for smallarms or ordnance; Supports or mountings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G1/00—Sighting devices
    • F41G1/46—Sighting devices for particular applications

Definitions

  • the disclosure relates generally to optical sighting devices for use with firearms. More particularly, the disclosure relates to reticles for use in a dual focal plane optical sighting device.
  • Reticles are used in optical sighting devices for aiming and for measuring distances or sizes of objects.
  • Various types of reticles can be used in optical sighting devices, such as riflescopes.
  • Wire crosshairs have been used in reticles for many years.
  • a glass etched reticle is a piece of glass with a pattern etched into the glass then, using a vapor deposit chamber, various substances can be deposited into the etched pattern.
  • chrome is generally used.
  • titanium dioxide or sodium silicate is generally used. This fine powder reflects light from a LED, which is positioned at the edge of the reticle housing and out of view of the user, towards the user's eye, and makes the reticle pattern appear to glow so it is easy to see in low light situations.
  • First focal plane reticles generally have smaller features, which usually prevents the use of wire reticles, because the wires are too big. Therefore, glass etched reticles are generally used for first focal plane reticles. Since the first focal plane is in front of the zoom magnification system (that is, the erector system), the reticle and image will change in size in proportion to one another: when the image gets bigger, the information on the reticle gets bigger at the same rate.
  • the zoom magnification system that is, the erector system
  • the reticle and image will change in size in proportion to one another: when the image gets bigger, the information on the reticle gets bigger at the same rate.
  • One advantage to this is that any measurement marks on the reticle will be accurate at any magnification setting the user chooses. As the image is magnified, the information on the reticle appears to get larger along with the image at the same rate, so all reticle markings will be accurate to its designed scale of measurement.
  • Second focal plane reticles do not adjust in size or scale when the magnification of the image is changed because they are located behind the erector system. Therefore, a second focal plane reticle is generally sized for a specific magnification setting of the riflescope.
  • the scope In order for the measurement marks on a second focal plane reticle to be accurate, the scope must be set at a precise magnification setting for which the given reticle is designed. In order to use the measurement marks in another magnification, therefore, the user would need to mathematically calculate the difference for accurate use. Because the thickness of the lines on a second focal plane reticle do not change with the magnification setting, the lines can be optimized for a desired thickness, and at any magnification the lines will appear the same thickness to the user's eye.
  • Reticle illumination has been used for many years in traditional style riflescopes, but there have been illumination problems.
  • a discussion of glass reticle technology will be useful background. Years ago, glass reticles were invented because they had the advantage of enabling "floating" reticle features.
  • the term "floating,” when applied to a reticle, means that any design can be placed onto the glass surface without any other physical support, that is, the designs do not need to be connected.
  • Floating reticles are unlike wire reticles, as the latter require all the reticle features to be supported by being connected to a frame in some way, much like a stencil or a neon sign.
  • a glass reticle makes possible any pattern imaginable.
  • glass reticle makers will etch glass with a pattern, and then fill the etched areas with a various different materials, depending on different factors. Commonly, chrome is used as a material for filling the etched portion for use in non-illuminated features. For illuminated features, glass reticle makers commonly use a reflective material such as but not limited to titanium dioxide and sodium silicate. Usually, in a glass reticle there is a second piece of glass cemented over the reticle pattern to protect the pattern, thereby creating a doublet.
  • One alternative way to provide brighter illumination is the use of light piped through an optic fiber to the center of the reticle to make a bright center dot or other shape. This is currently used in the Vortex Razor 1-6x24 scope, for example.
  • the light piped through the optic fiber may be ambient light or may also be provided by an LED or other suitable light source. Illuminating the optic fiber with an LED results in a very bright reticle that can be seen in bright daylight, and does not dim when the user moves his head off axis. The problem with this design is that it can only be used in the second focal plane.
  • optic fibers have the drawback of only having an illuminated center dot, or chevron, or other similarly small and compact shape. But disconnected entities are very difficult without multiple fibers.
  • Other illumination types can result in a fully illuminated reticle pattern or a center pattern other than a simple dot. For example, wire reticles with optic fibers that are illuminated by LEDs have been used.
  • both reticles include vertical and/or horizontal stadia lines or markings including, but not limited to, "crosshair" lines.
  • reticles also typically employ other markings including, but not limited to: subtension markings, hash marks, dots, horseshoes, or other shapes or patterns. Such markings may provide a shooter with information including, but not limited to, measuring distances, object sizes, and how to compensate for holdover and crosswinds. Including lines or markings on both reticles makes the alignment of the reticles to each other extremely important.
  • OLED organic light-emitting diode
  • U.S. Patent Application Publication Number 2013/0033746 discloses a transparent OLED screen reticle as well as other types of electronic reticles, and various electronic reticle shapes.
  • One problem with electronic reticles including OLED reticles, however, is that if battery power is lost, so too is the reticle. In this situation, there are no aiming options.
  • Another disadvantage is that it can be complicated to connect the OLED screen to the magnification. Such difficulty leads to more opportunities for failure and an increase in cost and complexity.
  • US2013/0170027 discloses a reticle system for a variable optical power sighting device that includes front and rear reticles proximate respective front and rear focal planes of the device. Range-compensating features are provided, such as a scale and a pair of bracketing marks formed in the rear reticle which cooperate with an indicator mark formed in the front reticle. The indicator mark is radially offset from the optical axis it appears to move in the field of view along the scale in response to adjustment of the optical power to thereby indicate a measurement corresponding to a size of a distant target subtended in the field of view by the bracketing marks.
  • a two-part electronic reticle system is also disclosed utilizing similar principles of operation. The rear reticle and scale may be electroformed to reduce cost and improve light transmission relative to a glass reticle.
  • US2011/0280040 discloses an optical sight including a housing; at least one optic supported by the housing; an illumination device associated with the at least one optic and selectively supplying the at least one optic with light, the illumination device including a first fiber associated with a first light source; a coupler collecting light from the first fiber and supplying the at least one optic with light from the first light source; and an electroluminescent device associated with the at least one optic and selectively supplying the at least one optic with light separate from the coupler.
  • an optical sighting device as defined in claim 1.
  • an optical system for use in an optical sighting device as defined in claim 13.
  • FIG. 1 shows an exemplary dual focal plane optical sighting device 10, having a scope body 12, objective lens end 40 and eyepiece end 50.
  • FIG. 2 shows a cross-section of the sighting device from FIG. 1 showing the basic components of optical system 14 and moveable optical element 15.
  • optical system 14 includes an objective lens system 16, erector system 25, and eyepiece 18.
  • FIG. 2 shows a riflescope embodiment of the invention having a body 12, but optical system 14 could be used in other types of sighting devices as well.
  • Erector system 25 may be included within a moveable optic element 15.
  • moveable optic element 15 also includes a collector 22, as well as first focal plane reticle 55 and second focal plane reticle 57. When in use, adjustment of turret assembly 28 and turret screw 29 causes adjustment of moveable optic element 15.
  • FIG. 3 shows a close-up view of an optical system 14 in cross-section, illustrating how light rays travel through the optical system 14.
  • Optical system 14 may have additional optical components such as collector 22, and it is well known within the art that certain components, such as objective lens system 16, erector system 25, and eyepiece 18 may themselves have multiple components or lenses.
  • Optical system 14 shown here is drawn as a basic system for illustration of one embodiment of the invention but it should be understood that variations of other optical systems with more or less structural components would be within the scope of the invention as well.
  • FIG. 4 is a schematic drawing of the basic components of one embodiment of a dual focal plane optical sighting device 10, having an objective lens end 40 and an eyepiece end 50.
  • the focal plane proximal to the objective lens end 40 is a first focal plane 20 (FFP).
  • the focal plane closer to the eyepiece end is a second focal plane 30 (SFP).
  • As light passes through the dual focal plane optical sighting device 10 light is focused to form an image that is clear to the eye of a user at the first 20 and second 30 focal planes.
  • Magnification occurs in an erector system 25 located between the first and second focal planes.
  • FIG. 4 also shows optional components controller 82 and switch 84.
  • Controller 82 may contain a chip with memory for storing various reticle patterns or other information used by the device.
  • a glass reticle 60 (such as a glass etched reticle) is positioned at the first focal plane 20 and an electronic reticle 70 (such as an OLED reticle) is positioned in the second focal plane 30.
  • the pattern on the glass reticle 60 could be a cross hair with hash marks, for example, and the pattern of the electronic reticle 70 could be a dot as seen in FIG. 6 . It should be understood that numerous other types and shapes of reticles and reticle patterns could be used as well.
  • the electronic reticle 70 is placed on the same focal plane as the glass reticle 60.
  • the electronic reticle 70 could be positioned at the first focal plane 20 and the glass reticle 60 positioned at the second focal plane 30.
  • wire reticles could be used in either focal plane position.
  • the two reticles have to be properly aligned so that when they are viewed by a user from the eye piece, the reticles appear aligned as seen in FIG. 8 . If not properly aligned, the reticles may appear misaligned to the user's eye as shown in FIG. 5 . If the alignment between the first focal plane reticle and the second focal plane reticle is off by only a small fraction of a millimeter, it will be very noticeable to the user. When the two reticles are properly aligned, it is called the "true position.”
  • the first focal plane 20 and second focal plane 30 may be rather far apart and the reticles themselves are physically rather small (although through the eyepiece they may appear large).
  • glass etched reticles are generally about 10 microns, and some reticles have lines that are 0.005mm thick.
  • the first focal plane and second focal plane could be separated by a distance of 50-100mm within the body of a sighting device. As such, it is difficult to get a precise alignment over that distance. Alignment of such small reticles requires very small movements. If the dual focal plane optical sighting device features two glass etched reticles, alignment must be done mechanically to a high degree of precision, which is difficult and costly to accomplish.
  • one advantage of having one glass reticle 60 and one electronic reticle 70 in a dual focal plane optical sighting device 10 is to simplify the complexity and cost of mechanically aligning the two reticles.
  • Dual reticle alignment can be simplified by requiring less or even no mechanical alignment, depending on the manufacturing process used.
  • electronic reticle 70 could be digitally aligned with glass etched reticle 60 using computerized or automated processes.
  • Some OLED screen reticles have pixels that are under 5 microns. Since this is about half the line width of the glass reticle, it easier to align the digital reticle.
  • the glass reticle will remain visible and operative as a backup aiming solution.
  • the dual focal plane optical sighting device 10 could also have a memory chip or internal processor, for example within controller 82, which contains various electronic reticle options, such as the dot from FIG.6 , the broken circle from FIG. 5 or a horseshoe. Additionally, a user interface such as a screen or dial could be used to toggle between the various reticle choices. Once two reticles within the dual focal plane optical sighting device 10 are digitally aligned, the electronic reticle options can be optimized to work with the glass reticle 60 and provide the user many reticle options to choose from.
  • the optical sighting device 10 can also be particularly useful with firearms that can accommodate both a supersonic bullet and a subsonic bullet.
  • the 300 blackout bullet is a bullet that can be used either way, although in other rifles, different bullets can be used for each function.
  • Supersonic is faster and carries more energy.
  • Subsonic is much quieter, especially when used with a sound suppressor or silencer on a rifle.
  • the optical sighting device 10 of this disclosure can accommodate this interchangeability.
  • the optical sighting device 10 is adapted to be used with a supersonic bullet and a subsonic bullet.
  • the optical sighting device 10 can include a controller 82 including a memory chip or internal processor for causing at least two marking patterns to be displayed on the electronic reticle, the first pattern 75 illustrating hold over or angular markings for use with the supersonic bullet, and the second pattern 80 illustrating hold over or angular markings for use with the subsonic bullet, the second pattern having greater spacing between the markings than in the first pattern.
  • a switch 84 on the riflescope changes a series of drop dots or other "hold over" aiming points or angular markings based on the bullet used (subsonic vs. supersonic). Different colors, shapes, or any combination thereof can be used to differentiate between the hold-over features, depending on whether supersonic or subsonic was selected.
  • pressing the switch 84 on the side of the device 10 changes the dots between a supersonic pattern ( FIG. 7 ) and subsonic pattern ( FIG. 8 ).
  • Supersonic patterns and subsonic patterns may also be illuminated in different colors to further differentiate them. Any combination of colors and/or shapes could be used to denote between supersonic and subsonic. Since the subsonic is a slower bullet, it will see more bullet drop over a given distance than a supersonic bullet. As a result, the hold-over dots need to be spaced out more, as illustrated in comparing FIG. 7 and FIG. 8 , in order to accommodate this greater amount of bullet drop.
  • the second focal plane reticle illustrated in FIGS. 7 and 8 having glass etched markings is that in the event that battery power fails (and thus the illuminated dots from the first focal plane reticle are unavailable), the shooter still has the benefit of the second focal plane reticle for reference.
  • a glass etched or non-electronic reticle can also have basic angular markings (MOA or MRAD) hashed to be used if battery power fails, with the dots corresponding to a crosswind speed.
  • MOA basic angular markings
  • first focal plane reticle 100 ( FIG. 9A ) is disposed at first focal plane 20 and second focal plane reticle 200 ( FIG. 9B ) is disposed at second focal plane 30.
  • First focal plane reticle 100 includes first focal plane vertical and horizontal stadia lines 102, 104.
  • Second focal plane reticle 200 includes second focal plane vertical and horizontal stadia lines 202, 204.
  • FIG. 9C shows the optical sighting device 10 in a zoomed out position and the reticles 100, 200 are in perfect alignment.
  • first focal plane reticle 100 also includes a plurality of subtension marks 106 and accompanying numbers 108 are distributed along the stadia lines 102, 104.
  • the first focal plane stadia lines 102, 104 are indistinguishable from second focal plane stadia lines 202, 204. If the reticles 100, 200 are out of alignment for any reason, however, including when the user simply moves his line of sight out of perfect alignment with center axis 150 (see FIGS. 1-2 ) of the optical sighting device 10, the user is presented with a view similar to that in FIG. 10 , which shows first focal plane stadia lines 102, 104 visible separately from second focal plane stadia lines 202, 204. A view like the one in FIG.
  • first focal plane stadia lines 102, 104, subtension lines 106, numbers 108, and any other markings increase in size and thickness, but second focal plane stadia lines 202, 204 and target dot 206 do not change.
  • the increased thickness of the lines on first focal plane reticle 100 tends to obscure more of the field of view than the user would prefer.
  • FIGS. 12 and 13 illustrate a solution to the alignment problems described above, namely separating elements of the reticles in the first and second focal planes such that the first focal plane and second focal plane markings are superimposed or complimentary when viewed through the eyepiece of the device.
  • FIG. 12 shows a glass etched reticle 300 having subtension lines 302 and numbers 304, but no stadia lines. On its own, glass etched reticle 300 would be difficult to use. Of course, any other suitable markings may also be included in glass etched reticle 300 without departing from the invention.
  • glass etched reticle 300 is disposed at the first focal plane 20.
  • FIG. 13 shows a wire reticle 400 having vertical and horizontal stadia lines 402, 404, and a target dot 406.
  • Wire reticle 400 does not include any subtension lines and is disposed at the second focal plane 30 in this embodiment.
  • wire reticle 400 may include an illuminated target dot 406.
  • illuminated target dot 406 may be illuminated by an optic fiber 408, which may be aligned with and track along one of the stadia lines 402, 404.
  • optic fiber 408 is positioned in front of vertical stadia line 404, it may be positioned in front of the horizontal stadia line 402 or any other wire included in wire reticle 400 without departing from the invention.
  • FIG. 13B shows a side view of optic fiber 408 and target dot 406, which appears as a bright dot to the user when an LED 410 is illuminated.
  • LED 410 may be powered by a battery, and may be any suitable color. It may also be possible to provide an LED 410 that can change color, allowing the user to select a preferred color.
  • One end of optic fiber 408 may optionally include a light collector 412, which acts as a funnel of sorts to capture as much light 414 as possible.
  • the other end of optic fiber 408 is cut at a 45 degree angle, which reflects the light passing through the fiber toward the eye of the user.
  • Light 414 is collected by light collector 412, passes through optic fiber 408, and reflects off of target dot 406, before traveling to the eye of the user.
  • optic fiber 408 may include a 90° bend at the location of the target dot 406 so that the end of optic fiber 408 opposite the light source points toward the user's eye without having to cut the optic fiber at an angle.
  • LED 410 is described here to illuminate the target dot 406 in the embodiment shown, any suitable light source may be used without departing from the invention, such as a prism, OLED system, other non-LED lamp, or by exposing loops of optic fiber 408 to ambient light that may be collected and transmitted to target dot 406.
  • Aligning glass etched reticle 300 and wire reticle 400 creates the illusion of viewing a single reticle when viewed through the optical sighting device 10. Unlike existing dual focal plane optical sighting devices that include reticles having markings that overlay each other as described above, using glass etched reticle 300 in combination with wire reticle 400 eliminates any double vision issues as shown in FIGS. 9-11 .
  • FIG. 14 shows a view through a dual focal plane optical sighting device 10 in accordance with the invention showing glass etched reticle 300 ( FIG. 12 ) and wire reticle 400 ( FIG. 13 ) in perfect alignment and with the optical sighting device in a zoomed out position.
  • the view shown in FIG. 14 is nearly identical to the one shown in FIG. 9 .
  • FIG. 15 shows another view through dual focal plane optical sighting device 10 showing the device in a zoomed in position. In the zoomed in position, the marks on the glass etched reticle 300 increase in size and thickness, but the stadia 402, 404 and targeting dot 406 on the wire reticle 400 remain the same size.
  • FIG. 15 shows the reticles 300, 400 in perfect alignment as well.
  • FIG. 16 shows what happens if the reticles 300, 400 are misaligned or the user moves his line of sight off axis and the optical sighting device 10 is in a zoomed out position.
  • stadia are only included on wire reticle 400.
  • any other markings may be included on glass etched reticle 300 and variations to the stadia lines 402, 404, the targeting dot 406, or any other marking on the wire reticle 400 may be used without departing from the invention.
  • FIGS. 18A-C show some exemplary examples of additional reticle patterns that may be included in the first focal plane.
  • any other suitable reticle pattern may be used without departing from the invention.
  • the previously described electronic reticle 70 may be used in the first focal plane 20, wherein the electronic reticle 70 would not include the vertical and horizontal stadia lines present in wire reticle 400.
  • the flexibility of the electronic reticle 70 display is ideal for providing a shooter with a variety of reticle pattern options, which could be superimposed over the features of wire reticle 400.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
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EP16812319.8A 2015-06-17 2016-06-15 Dual focal plane reticles for optical sighting devices Active EP3311098B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP21171283.1A EP3875885A1 (en) 2015-06-17 2016-06-15 Dual focal plane reticles for optical sighting devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/742,415 US10900745B2 (en) 2013-09-06 2015-06-17 Dual focal plane reticles for optical sighting devices
PCT/US2016/037594 WO2016205346A1 (en) 2015-06-17 2016-06-15 Dual focal plane reticles for optical sighting devices

Related Child Applications (1)

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EP21171283.1A Division EP3875885A1 (en) 2015-06-17 2016-06-15 Dual focal plane reticles for optical sighting devices

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EP3311098A1 EP3311098A1 (en) 2018-04-25
EP3311098A4 EP3311098A4 (en) 2018-12-26
EP3311098B1 true EP3311098B1 (en) 2021-05-05

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EP21171283.1A Pending EP3875885A1 (en) 2015-06-17 2016-06-15 Dual focal plane reticles for optical sighting devices

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EP (2) EP3311098B1 (ja)
JP (3) JP6797141B2 (ja)
CN (2) CN107923725B (ja)
AU (3) AU2016278051B2 (ja)
CA (1) CA2989411C (ja)
PH (1) PH12017502336A1 (ja)
WO (1) WO2016205346A1 (ja)
ZA (1) ZA201708548B (ja)

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JP2022535900A (ja) * 2019-06-05 2022-08-10 シェルタード ウィングス インコーポレイテッド ディオプター調整機構
CN115342687A (zh) * 2022-10-18 2022-11-15 江西德瑞光电技术有限责任公司 一种瞄准模组及使用该瞄准模组的瞄准具

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EP3311098A4 (en) 2018-12-26
JP2023076544A (ja) 2023-06-01
JP6797141B2 (ja) 2020-12-09
EP3311098A1 (en) 2018-04-25
CN107923725B (zh) 2021-08-27
PH12017502336A1 (en) 2018-07-02
AU2016278051B2 (en) 2021-02-25
AU2021203349A1 (en) 2021-06-24
ZA201708548B (en) 2019-09-25
JP2021042953A (ja) 2021-03-18
CA2989411A1 (en) 2016-12-22
WO2016205346A1 (en) 2016-12-22
NZ738314A (en) 2023-11-24
AU2023202468A1 (en) 2023-05-11
CN113446901A (zh) 2021-09-28
AU2016278051A1 (en) 2018-01-18
CN107923725A (zh) 2018-04-17
CN113446901B (zh) 2023-10-24
EP3875885A1 (en) 2021-09-08
JP2018524542A (ja) 2018-08-30
CA2989411C (en) 2023-10-17

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