Patent Grant
11577144
Embodiments of the invention relate to a system of straps that stiffen a trampoline frame. Embodiments of the invention further relate to a trampoline comprising frame stiffening straps and a method for assembling such a strap system in a trampoline.
The following description includes information that may be useful in understanding embodiments of the invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
The modern trampoline era began in the mid-1930s, see, e.g., U.S. Pat. No. 2,370,990 by George Nissen who with Larry Griswold was instrumental in developing the modern trampoline. Even though trampolines were initially developed for competitive or professional purposes, trampolines for recreational use are nowadays popular home entertainment accessories.
A trampoline comprises a flexible mat, a frame, and at least one resilient member. The flexible mat is typically stadium (rectangular with rounded edges), circular, oval, square, or rectangular. The flexible mat may comprise a cloth or net-shaped structure. It may be made of a polymeric material, such as polypropylene. The frame, conventionally made of metal, encompasses the flexible mat and typically has substantially the same shape as the flexible mat. A circular or oval mat is typically surrounded by a circular or oval frame having a larger diameter than the flexible mat, and a square or rectangular mat is typically surrounded by a substantially square or rectangular frame, which however may comprise rounded-off edges (in a stadium-like shape).
The flexible mat typically comprises a plurality of attachments distributed along the mat's edge. The attachments are adapted to receive one or more resilient members for retaining the flexible mat under tension, creating a suspension system. The resilient members may comprise a plurality of springs (e.g. helical springs) that connect the edge of the flexible mat to the frame, thereby tensioning the flexible mat. When a person is using the flexible mat, i.e. jumping on it, the springs will extend in length and thereafter strive to return to their resting length. The spring may be attached to a loop, such as a D-shaped or triangle shaped ring, comprised in the flexible mat by means of a hook that attaches to the spring. Thus, the system of loops and D-rings comprise the plurality of attachments for the flexible mat to receive the resilient members.
In some trampoline embodiments, the resilient member may comprise an elastic cord. Normally, the elastic cord is long enough to go back and forth between the edge of the flexible mat and the frame several times. Each portion connecting the flexible mat to the frame then forms a segment, which correspond to a spring in the above example. The elastic cord may be so long, that only one elastic cord is utilized for the whole mat, or a plurality of elastic cords may be used.
The flexible mat is conventionally surrounded by an edge pad, which is adapted to at least partly cover the at least one resilient member and/or the frame. The edge pad helps prevent users from stepping or landing between the resilient members, e.g. when climbing onto the flexible mat. The edge pad may also be arranged to cover the frame, thereby reducing a possible impact with the frame in case of stepping or landing on the frame. The edge pad is often made as a number of segments, the shapes of which are adapted to the frame and the flexible mat. For a circular or oval mat, the segments may therefore be arc-shaped. For a square or rectangular mat, rectangular segments may be used. Similarly, for a stadium shape, straight and curved pieces may be used.
It is known in the prior art for the trampoline frame to have a series of elastic straps fastened to the frame that provide a separation between the resilient members (e.g., helical spring) and the edge pad. For example, see Chinese Utility Model CN 2014193381 U.
While trampoline construction has improved in recent years, there nevertheless exists a continuous need to improve trampoline construction, especially where such improvements can be accomplished in a commercially reasonable fashion.
Embodiments of the invention provide a trampoline, comprising a frame having a circumference, a flexible mat, a plurality of resilient members attached to the frame and to the flexible mat, wherein the resilient members receive kinetic energy from a user jumping on the flexible mat, causing the user to be raised above the surface of the flexible mat, and a plurality of first tensioning straps, each strap of the plurality of first tensioning straps attached to the frame such that the circumference of the frame is covered by the plurality of first tensioning straps, wherein the plurality of first tensioning straps provide heightened tension to the frame.
Embodiments of the invention may further comprise a plurality of second tensioning straps that include ratchets for providing additional tension to each strap of the second tensioning straps.
Embodiments of the invention may further provide a plurality of receptacles for receiving the plurality of first tensioning straps and the plurality of second tensioning straps. The plurality of receptacles may comprise one of a plurality of channels and a plurality of loops.
Embodiments of the invention may further provide a plurality of sideways straps. A portion of the plurality of sideways straps may comprise springs that attach to the frame and provide increased tension to at least some straps of the first plurality of straps. A portion of the plurality of sideways straps may comprise hooks that attach to the frame and aid in keeping an edge pad anchored above the frame.
Embodiments of the invention will be further explained by means of non-limiting examples with reference to the appended drawings. Figures provided herein may or may not be provided to scale. The relative dimensions or proportions may vary. It should be noted that the dimensions of some features of the present invention may have been exaggerated for the sake of clarity.
Embodiments of the invention provide a set of tensioning straps fastened across the opposite ends of a trampoline to stiffen the trampoline's frame, according to an embodiment of the invention. Thus, a rectangular trampoline may employ a set of four tensioning straps, each tensioning strap fastened from end to opposite end of a trampoline, according to an embodiment of the invention. Further embodiments of the invention may comprise additional sets of tensioning straps fastened across opposite ends of a trampoline.
The set of tensioning straps enable a stiffer trampoline frame, which provides for better trampoline performance, according to an embodiment of the invention. A stiffer frame may also render the trampoline quieter during operation as well. Embodiments of the invention may, in some instances, stiffen the trampoline frame to the extent that the trampoline itself makes almost no noise during use with the primary sound produced not by the jingling of the resilient members (e.g., helical springs) but by the sound of the user's body (e.g., feet) striking the trampoline mat.
A further set of sideways straps may be applied to the tensioning straps, according to an embodiment of the invention. The sideways straps may create further tension in the tensioning straps, increasing the benefits provided by the tensioning straps. The sideways straps may also assist in keeping the trampoline edge padding in place both in terms of its sideways movement but also in terms of its position on the trampoline, according to an embodiment of the invention.
An edge pad may be applied on top of the tensioning straps and the sideways straps, according to an embodiment of the invention. Attaching the edge pad to the tensioning straps and sideways straps helps keep the edge pad in place as the flexible mat moves up and down. Attaching the tensioning straps and the sideways straps to the edge padding may reduce movement of the edge pad as the trampoline's flexible mat moves during operation. In addition, the tensioning straps and the sideways straps may hold the edge padding above the trampoline's suspension system (e.g., helical springs), which means that the edge padding is less likely to engage with the trampoline's suspension system, as well as the flexible mat, during operation, according to an embodiment of the invention.
The edge pad may include a plurality of channels and/or loops through which the tensioning straps and/or sideways straps may pass, according to an embodiment of the invention. The channels or loops may be attached to the edge pad by means of stitching, and the tensioning straps and sideways straps may be fed into through the channels and/or loops to hold the edge pad in place. The channels and/or loops may enable a sideways suspension system for the edge pad, according to an embodiment of the invention. The channels and/or loops may also facilitate assembly of the trampoline, according to an embodiment of the invention.
Embodiments of the invention also provide a sideways suspension system for the trampoline edge pad. The edge pad may include a combination of springs and rubber bands that enable a specialized frame hook to attach the edge pad securely to the trampoline frame, according to an embodiment of the invention. One end of the springs/elastic band is fastened to the sideways straps used to provide further tension to the tensioning straps. In this embodiment of the invention, the edge pad is flexible in sideways motion while at the same time being returning to the correct position to be able to protect from the hard trampoline parts. This embodiment also simplifies trampoline mounting. In conventional application, the rubber straps of the edge pad rotate around the cylindrical trampoline frame.
Fastening the tensioning straps 103a-103d respectively between attachment point pairs 107a-107d, 109a-109d may impart tension to the frame 106, stiffening the frame 106, according to an embodiment of the invention. In other words, the strap 103a is attached to the points 107a, 109a, for example. The tensioning straps 103a-103d are attached to the attachment point pairs 107a-107d, 109a-109d under tension, according to an embodiment of the invention. The tension may be applied in a number of ways known to those of ordinary skill in the relevant field.
The tensioning straps 103a-103d are also attached to a side of the frame 106 by sideways straps 111a-111h, according to an embodiment of the invention. The sideways straps 111a-111h provide further tension to the tensioning straps 103a-103d. In other words, the strap 103a is tensioned by the sideways strap 111a, for example. In some embodiments of the invention, the sideways straps 111a-111h may collectively provide greater tension to the straps 103a-103d than the connection at the attachment point pairs 107a-107d, 109a-109d.
The combination of the tension provided at the attachment point pairs 107a-107d, 109a-109d and the sideways straps 111a-111h may provide a significant tension increase in comparison to a frame 106 having no such tension mechanism. The additional tension provided by the strap 103a, connected under tension at points 107a, 109a and under further tension by the sideways strap 111a may increase the tension in the frame 106 from 300 N to 800 N, according to an embodiment of the invention. The range of increased tension depends on a variety of factors, including the cost of components, thus even lower levels of tension may be applied in some embodiments, such as 250 N.
The trampoline 100 includes a mat 101 held to the frame 106 by a plurality of resilient members 108, e.g., helical springs. Each resilient member attaches to a respective D-ring that itself attaches to the mat 101. The tension between the mat 101 and the resilient members 108 creates a suspension system for the trampoline 100. Thus, the resilient members 108 comprise a suspension system between the mat 101 and the frame 106 for the trampoline 100. Trampoline users jump or bounce on the mat 101 in a vertical direction and possibly also move in a horizontal direction perpendicular to the first direction. This arrangement of the suspension system is known in the prior art, such as shown in PCT/EP2017/057961, “Safety Net for a Trampoline, A Trampoline, and a Method of Arranging a Safety Net in a Trampoline,” which is hereby incorporated by reference.
The fabric of the flexible mat 101 that users jump or bounce on is often not elastic itself, instead the resilient members 108 (e.g., helical springs) provide the elasticity which creates the potential energy.
Similarly, each strap 204a-204d of the second set of tensioning straps is fastened at opposite ends of the frame 206. In other words, the strap 204a is fastened at point 217a and at 219a. Likewise, the tensioning straps 204b-204d are respectfully fastened at points 217b-217d, 219b-219d.
The first set of tensioning straps 203a-203d may be attached to the points 207a-207d, 209a-209d under tension. The second set of tensioning straps 204a-204d may be attached to the points 217a-217d, 219a-219d under tension. The tension may be applied in a number of ways, according to various embodiments of the invention.
The tensioning straps 203a-203d are also attached to a side of the frame 206 by sideways straps 211a-211h. The sideways straps 211a-211h provide further tension to the tensioning straps 203a-203d, according to an embodiment of the invention. In some embodiments of the invention, the sideways straps 111a-111h may collectively provide greater tension to the straps 103a-103d than the connection at the points 107a-107d, 109a-109d.
The combination of the tension provided at the points 207a-207d, 209a-209d and the sideways straps 211a-211h may provide a significant tension increase in comparison to the frame 206 having no such tension mechanism. The additional tension provided by the strap 203a, connected under tension at points 207a, 209a and under further tension by the sideways strap 211a may increase the tension in the frame 206 from 300 N to 800 N, according to an embodiment of the invention. The range of increased tension depends on a variety of factors, including the cost of components, thus even lower levels of tension may be applied in some embodiments, such as 250 N.
The tensioning straps 204a-204d are also tensioned by ratchets 220a-220d. The ratchets 220a-220d may comprise devices capable of delivering very high tensioning, including tensioning exceeding that of the tension provided by the sideways straps 111a-111h for the tensioning straps 203a-203d, according to an embodiment of the invention.
The combination of the tension provided at the points 217a-217d, 219a-219d and ratchets 220a-220d may provide a significant tension increase in comparison to a frame 206 having no such tension mechanism. The additional tension provided by the strap 204a, connected under tension at points 217a, 219a and under further tension by the ratchet 220a may increase the tension in the frame 206 from 3000 N-4000 N, according to an embodiment of the invention. The range of increased tension depends on a variety of factors, including the cost of components, thus even lower levels of tension may be applied in some embodiments, such as 2500 N.
The trampoline 200 includes a mat 201 held to the frame 206 by a plurality of resilient members 208, e.g., helical springs. Each resilient member attaches to a respective D-ring that itself attaches to the frame 206. The tension between the mat 201 and the resilient members 208 creates a suspension system for the trampoline 200. The resilient members 208 comprise a suspension system between the mat 201 and the frame 206 for the trampoline 200. Trampoline users jump or bounce on the mat 201 in a vertical direction and possibly also move in a horizontal direction perpendicular to the first direction.
As previously discussed, the flexible mat 201 is retained in tension by a plurality of resilient members 208 (e.g., coiled springs), according to an embodiment of the invention. The resilient members 208 are attached at or adjacent to an edge of the flexible mat 201. The resilient members 208 attach to an underside surface of the frame 206. The first set of tensioning straps 203a-203d and the second set of tensioning straps 204a-204d attach to the frame 206 at a position well above the resilient members 208, such that the resilient members 208 will not come into contact with either the first set of tensioning straps 203a-203d or the second set of tensioning straps 204a-204d during operation of the trampoline 200 by various users.
The fabric of the flexible mat 201 that users jump or bounce on is often not elastic itself, instead the resilient members 208 (e.g., helical springs) provide the elasticity which creates the potential energy. The thickness of the flexible mat 201 is typically in the range of 0.2 mm to 1 mm. However, the flexible mat 201 is usually reinforced at its edge, resulting in a higher thickness at the edge of the flexible mat 201.
The tensioning straps 303a, 303b are fastened at both ends of the frame 306. In other words, the tensioning strap 303a is fastened at point 307, and the tensioning strap 303b is fastened at point 309, according to an embodiment of the invention. The tensioning strap 303a would also be fastened at the opposite end of the trampoline 300. The tensioning strap 303b would be similarly fastened at the opposite end of the trampoline 300.
The tensioning straps 304a, 304b are fastened on the corner support bar 330 at both ends of the frame 306, according to an embodiment of the invention. The tensioning strap 304a is respectfully fastened at point 317, and the tensioning strap 304b is fastened at point 319. Similarly, the strap 304a is also fastened at a corner support bar on an opposite end of the frame 306, and the strap 304b would also be fastened at another opposite end of the frame 306.
The tensioning straps 303a, 303b are attached to the points 307, 309 under tension. The tensioning straps 304a, 304b are similarly attached to the points 317, 319 under tension. The tension may be applied in a number of ways.
The tensioning straps 303a, 303b would likely be tensioned by sideways straps, such as the sideways straps 211a-211h shown in
The tensioning straps 304a, 304b are similarly attached to the points 317, 319 under tension. The tensioning straps 304a, 304b may be tensioned at a different (e.g., higher) tension than the tensioning straps 303a, 303b. Among other things, the tensioning straps 304a, 304b may be tensioned using a ratchet, such as the ratchet 220a-220d shown in
The tensioning straps 303a 303b, 304a, 304b are fastened at both ends of the frame 306. In other words, the strap 303a is fastened at point 307, and the tensioning strap 303b is fastened at point 309, according to an embodiment of the invention. The tensioning strap 303a would also be fastened at the opposite end of the trampoline 300. The tensioning strap 303b would be similarly fastened at the opposite end of the trampoline 300.
The tensioning straps 303a, 303b are attached to the points 307, 309 under tension. The tensioning straps 303a, 303b would likely be tensioned by sideways straps, such as the sideways straps 211a-211h shown in
Likewise, the tensioning strap 304a is respectfully fastened at point 317, and the tensioning strap 304b is fastened at point 319. Similarly, the tensioning strap 304a is also fastened at an opposite ends of the frame 306, and the tensioning strap 304b would also be fastened at an opposite end of the frame 306.
The tensioning straps 304a, 304b are similarly attached to the points 317, 319 under tension. The tensioning straps 304a, 304b may be tensioned at a different (e.g., higher) tension than the tensioning straps 303a, 303b. Among other things, the tensioning straps 304a, 304b may be tensioned using a ratchet, such as the ratchet 220a-220d shown in
The tensioning straps 403a, 403b are attached to the points 407, 409 under tension, according to an embodiment of the invention. The tensioning straps 416a, 416b are similarly attached to the points 417, 419 under tension. The tension may be applied in a number of ways. The tensioning straps 403a, 403b may be tensioned by sideways straps, such as the sideways straps 211a-211h shown in
As shown in
The edge pad 404 covers the frame 411 and the trampoline suspension system (e.g., the resilient member 408). The resilient member 408 (e.g., a coiled spring), one member of the set of resilient members of the trampoline suspension system, attaches at one end to the frame 411 and at the other end to a D-ring that itself attaches to the flexible mat 401. The tensioning straps 403a, 403b, 416a, 416b reside between the edge pad 404 and the resilient members 408 and may serve to prevent the edge pad 404 from engaging with the tensioning members 404 during trampoline operation, according to an embodiment of the invention.
The trampoline frame 411 is supported by multiple legs, such as a leg 415, that engage with a floor surface, e.g., the ground. The leg 415 may include one or more attachment points 410 for a safety net, such as the safety net 722 shown in
The tensioning straps 503a-503d are fastened at both ends of the frame 506. In other words, the tensioning strap 503a is fastened at point 507a and at point 509a. Likewise, the tensioning straps 503b-503d are respectfully fastened at points 517b-517d and 519b-519d. The tensioning straps 503a is attached to the points 507a, 509a under tension. The tension may be applied in a number of ways.
The tensioning straps 503a-503d are also attached to a side of the frame 506 by sideways straps 510a-510h. The sideways strap 510a provides further tension to the tensioning strap 503a. The sideways strap 510a operating in conjunction with the tensioning strap 503a may also act to hold the edge pad 504 in place on the frame 506 since the tensioning strap 503a and sideways strap 510a are not only attached to the edge pad 504 but they are also attached to the frame 506.
As shown in
The tensioning straps 503a-503d are fastened at both ends of the frame 506. In other words, the tensioning strap 503a is fastened at point 507a and at point 509a, for example. Likewise, the tensioning straps 503b-503d are respectfully fastened at points 507b-507d and 509b-509d. The tensioning strap 503a is attached to the points 507a, 509a under tension. The tension may be applied in a number of ways.
The tensioning straps 503a-503d are also attached to a side of the frame 506 by sideways straps 510a-510h. The sideways strap 510a provides further tension to the tensioning strap 503a, according to an embodiment of the invention. The combination of tensioning straps 503a-503d and sideways straps 510a-510h may act to hold the edge pad 504 in proper position since the tensioning straps 503a-503d and the sideways straps 510a-510h are not only attached to the edge pad 504, they are also attached to the frame 506.
As shown in
The pockets and loops shown in
Another piece of flexible (stretchable) material 605a is fastened to the tensioning strap 603, such as the tensioning strap 203a shown in
In this embodiment, the edge pad 604 is flexible in sideways motion during operation while at the same time returning (e.g., springing back) to the correct position to protect the user from the hard trampoline parts due to the sideways strap combination 614, 605b that connects the edge pad 604 to the frame 606. This embodiment may also simplify trampoline mounting and assembly. (In a conventional application, the rubber straps of the edge pad tend to rotate around the cylindrical trampoline frame instead of being attached firmly by a hook like the specialized frame hook 614.)
As shown in
The edge pad 604 covers the frame 606 and the trampoline suspension system (e.g., the resilient member 608). The resilient member 608 (e.g., a coiled spring), one member of the set of resilient members of the trampoline suspension system, attaches at one end to the frame 606 and at the other end to a D-ring 613 that itself attaches to the flexible mat 601. Thus, the edge pad 604 resides above the frame 606 and the trampoline suspension system 608.
The trampoline 600 may include a mix of sideways straps 620 and sideways straps 614, 605a, depending on factors such as how much additional tension should be imparted to the tensioning strap 603 and other factors such as manufacturing expenses, according to an embodiment of the invention.
The tensioning straps 703a, 703b attached to the points 707, 709 under tension. The tension may be applied in a number of ways, as discussed with respect to
The tensioning straps 703a, 703b may also be attached to a side of the frame 706 by sideways straps, such as the sideways strap 712 that holds the tensioning strap 703a under tension to the frame 706, according to an embodiment of the invention.
The combination of the tension provided at points like point 707 for the strap 703a and point 709 for the strap 703b and additionally by the sideways strap 712 for the strap 703a may provide a significant tension increase in comparison to a frame 706 having no such tensioning mechanism. The additional tension provided by the strap 703a, connected under tension at point 707 and at another point not shown in
The trampoline 700 includes a mat 701 held to the frame 706 by a plurality of resilient members 708, e.g., helical springs. Each resilient member attaches to a respective D-ring that itself attaches to the frame 706. The tension between the mat 701 and the resilient members 708 creates a suspension system for the trampoline 700. The resilient members 708 comprise a suspension system between the mat 701 and the frame 706 for the trampoline 700. Trampoline users jump or bounce on the mat 701 in a vertical direction and possibly also move in a horizontal direction perpendicular to the first direction.
As previously discussed, the flexible mat 701 is retained in tension by a plurality of resilient members 708 (e.g., a coiled spring), according to an embodiment of the invention. The resilient members 708 are attached at or adjacent to an edge of the flexible mat 701 by attachments that include D-shaped or triangle-shaped rings. The attachment permits the at least one resilient member 708 to connect to the flexible mat 701. As shown in
The fabric of the flexible mat 701 that users jump or bounce on is often not elastic itself, instead the resilient members 708 (e.g., helical springs) provide the elasticity which creates the potential energy. The thickness of the flexible mat 701 is typically in the range of 0.2 mm to 1 mm. However, the flexible mat 701 is usually reinforced at its edge, resulting in a higher thickness at the edge of the flexible mat 701.
The trampoline 700 comprises the flexible mat 701 and an edge pad 703. The flexible mat 701 is encompassed by the frame 706. The frame 706 comprises legs 715, such that the trampoline 700 stands on the ground via the legs 715. The edge pad 703 covers the resilient members 708 (e.g., a coiled spring) and the frame 706.
The trampoline 700 includes a safety net 722 attached to a number of safety poles 718a-718h. The safety net 722 attaches to the outside edge of the edge pad 704, according to an embodiment of the invention. The safety net 722 and safety poles 718a-718h may be configured in a manner such as disclosed in the applicants' PCT/EP2017/057961 and/or as disclosed in applicants' pending EP18154158.2 application. Both applications are incorporated herein by reference.
The safety net 722 prevents a user from falling off the flexible mat 701 and hitting the ground. The safety net 722 may be retained by a safety net retainer, e.g. a number of support poles 718a-718h extending upwardly from the frame 706 for carrying the safety net 722 surrounding the flexible mat 701, according to an embodiment of the invention.
Embodiments of the invention may comprise a kit that is provided to the user in the form of a series of parts, such as a flexible mat, an edge pad, a frame (possibly in a number of pieces), a plurality of resilient members, and a safety layer. Instructions for assembling a trampoline comprising these parts can be provided to the user.
The trampolines described herein, such as but not limited to the trampoline 700 shown in
Further modifications of the invention within the scope of the appended claims are feasible. As such, the present invention should not be considered as limited by the embodiments and figures described herein. Rather, the full scope of the invention should be determined by the appended claims, with reference to the description and drawings.
Various embodiments of the invention have been described in detail with reference to the accompanying drawings. References made to particular examples and implementations are for illustrative purposes, and are not intended to limit the scope of the invention or the claims.
It should be apparent to those skilled in the art that many more modifications of the trampoline besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except by the scope of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context.
Headings and sub-headings provided herein have been provided as an assistance to the reader and are not meant to limit the scope of the invention disclosed herein. Headings and sub-headings are not intended to be the sole or exclusive location for the discussion of a particular topic.
While specific embodiments of the invention have been illustrated and described, it will be clear that the invention is not limited to these embodiments only. Embodiments of the invention discussed herein may have generally implied the use of materials from certain named equipment manufacturers; however, the invention may be adapted for use with equipment from other sources and manufacturers. Equipment used in conjunction with the invention may be configured to operate according to conventional methods and protocols and/or may be configured to operate according to specialized protocols. Numerous modifications, changes, variations, substitutions and equivalents will be apparent to those skilled in the art without departing from the spirit and scope of the invention as described in the claims. In general, in the following claims, the terms used should not be construed to limit the invention to the specific embodiments disclosed in the specification, but should be construed to include all systems and methods that operate under the claims set forth hereinbelow. Thus, it is intended that the invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
All publications herein are incorporated by reference to the same extent as if each individual publication or patent application were specifically and individually indicated to be incorporated by reference. Where a definition or use of a term in an incorporated reference is inconsistent or contrary to the definition of that term provided herein, the definition of that term provided herein applies and the definition of that term in the reference does not apply.
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| Number | Date | Country | |
|---|---|---|---|
| 20200238120 A1 | Jul 2020 | US |
| Number | Date | Country | |
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| 62797214 | Jan 2019 | US | |
| 62797216 | Jan 2019 | US | |
| 62797215 | Jan 2019 | US |
