Patent Application
20250213957
The present invention relates to the field of an exchangeable inline sliding body for attachment to a mount on an ice skate for use on synthetic ice.
Discussion of Related Art
A plurality of so-called inline skates are known in the prior art, which were developed as a replacement for ice skates for training during the warmer months on hard surfaces such as asphalt, wood or natural stone floors. Such inline skates typically have a rail which is designed to accommodate two to six rollers made of hard rubber, the hard rubber rollers containing a centered bearing and being arranged one behind the other on fixed axles.
In recent decades, however, the popularity of synthetic ice, which is made of polyethylene plates, has greatly increased and training is increasingly taking place on synthetic ice surfaces during the warmer months. Conventional skate blades are unsuitable for use on synthetic ice, however, as conventional skate blades have a significantly higher coefficient of sliding friction on synthetic ice than on natural ice and the skating and braking movements cause damage such as notches and abrasion in the form of polyethylene chips on the synthetic ice surface, which also severely impair the sliding properties of a conventional skate blade. As a result, the use of skate blades on synthetic ice requires a significantly greater amount of force to move compared to natural ice surfaces. To take this into account, various inline skates have been developed for use on synthetic ice surfaces. For example, EP 1008372 A1 and WO 9745180 disclose four to five centrically mounted steel rollers, ground on the contact surface, which are compatible with and can be attached to conventional inline skates and are thus exchangeable with hard rubber rollers. This means that it is not necessary to redesign the footwear, as it is easy to convert from hard rubber rollers to steel rollers and vice versa.
DE 8402692 U1 further discloses, for example, a plurality of ball bearings arranged one behind the other, the outer rings of which form the rollers and the inner rings of which are braced between two wall parts, the wall parts being convergingly beveled in the area of the roller axles in order to enable curved motion.
However, a disadvantage of all these inline skates known from the prior art is that their riding/gliding behavior on synthetic ice is unsatisfactory and no realistic skating experience can be created.
Another disadvantage of inline skates with steel rollers is their low rolling bearing stability. The force exerted on the roller bearings during gliding is often accompanied by a significant loss of rolling ability, which is often caused by fatigue and insufficient stability of the bearings.
An additional disadvantage of known inline skates with steel rollers from the prior art is that the steel rollers are not compatible with the ice skate used on natural ice and are therefore not exchangeable with the skate blade. This means that they can often only be used in conjunction with conventional inline skate shoes or are not exchangeable at all.
It is therefore the general object of the invention to further develop the prior art in the field of inline skates and preferably to overcome one or more disadvantages of the prior art. In advantageous embodiments, an interchangeable sliding body is provided which has an approximately realistic sliding behavior on synthetic ice with the same application of force as a skate blade on natural ice.
The general object of the invention is solved by the subject matter of the independent patent claim. Further advantageous embodiments result in each case from the dependent patent claims and the disclosure as a whole.
The sliding body according to the invention for ice sports appliances, in particular for ice skates, comprises two wall elements which comprise a roller attachment portion and a support strip attachment portion, wherein the roller attachment portion comprises a front, a middle and a rear portion and bearings inserted into the wall elements. Further, the sliding body comprises a plurality of rollers arranged in series. The rollers each comprise an axle and are arranged between the first and second wall elements along the roller attachment portion, wherein the axles are inserted into the bearings of the wall elements. An arrangement of the bearings in the wall elements allows a rotating axle, an internal rotation of the bearing and an axle which is formed in one piece and arranged rigidly on the respective roller, which on the one hand leads to an increase in the stability of the sliding body and on the other hand improves the sliding behavior. Furthermore, the rollers comprise a rolling surface, wherein the rolling surfaces comprise a grinding. The term “sliding body” used in the present disclosure is to be understood as a substitute for blades for use on synthetic ice, the sliding movement being imitated by the arrangement of the rollers.
Directional indications as used in the present disclosure are used in relation to the attached sliding body on an ice sports appliance, in particular on an ice skate in use. The directional indications are thus to be understood as follows: The longitudinal direction of the sliding body is described by an axle from the forefoot area to the heel area and thus extends along the longitudinal axis of the sliding body. The transverse direction of the sliding body runs transversely to the longitudinal axis and thus along a transverse axis and defines the thickness of the sliding body. In the context of the present invention, the vertical direction refers to a direction from the rolling surface of the sliding body in the direction of the ice skate, or in the operational state in the direction of the boot, and thus extends along a vertical axis of the sliding body.
The sliding body has a length which extends along the longitudinal axis between two opposite ends, whereby the sliding body length depends on the type of ice sport and the length of the boot to which the sliding body is attached. Preferably, the sliding body length is equal to or greater than the length of the wall elements and extends in a range of 150 mm to 350 mm, preferably between 160 mm and 330 mm, for ice hockey, bandy and figure skating and in a range of 150 mm to 550 mm, preferably between 160 mm and 500 mm, for speed skating.
Furthermore, the sliding body has a sliding body height and a sliding body thickness. The sliding body height extends in a vertical direction along the vertical axis, i.e. in use from the rolling surface to the support strip mounting elements, which are described in detail below. The sliding body height is in a range between 20 mm and 100 mm, for ice hockey and bandy sports preferably in a range between 25 mm and 50 mm and for figure skating and speed skating preferably between 40 mm and 75 mm. The sliding body thickness extends along the transverse axis and extends from the outer side of the first wall element to the outer side of the second wall element and thus comprises the two wall elements and the rollers arranged between them. The sliding body thickness is in a range between 6 mm and 15 mm, preferably in a range between 8 mm and 12 mm.
In further embodiments, the sliding body may have a planar outer structure in the vertical direction. In other words, the outer side of the wall elements and the bearings and attachment means attached to the wall elements can be present as a planar surface in the vertical direction.
The two wall elements have a wall element length, whereby the wall element length ranges from 150 mm to 550 mm. The wall element length extends in a vertical direction and depends on the number of rollers, the diameter of the rollers, the spacing between the rollers arranged one behind the other and the type of ice sport. Typically, the wall element length is the same length as the sliding body length. It is understood that the gliding element length can also be marginally longer than the wall element length. This can be the case, for example, if the two rollers that are outermost in the longitudinal direction are fitted between the two wall elements in such a way that they protrude axially in the longitudinal direction between the two wall elements, in which case the two points of the rollers that are outermost in the longitudinal direction define the sliding body length. Furthermore, the wall elements have a wall element height and a wall element thickness. The wall element height is in a range between 15 mm and 30 mm, preferably between 18 mm and 25 mm, and extends in a vertical direction. It is understood that the wall element height can vary along the longitudinal direction. The wall element thickness is in a range between 1 mm and 5 mm, preferably between 1.5 mm and 3 mm, and extends along the transverse direction.
Furthermore, the two wall elements are preferably each designed as a single piece and can be made of metal or metal alloys or of carbon-reinforced plastic fibers. If the wall elements consist of several metals, these materials are preferably of sandwich construction. For example, the top layers can be made of a metal alloy such as steel and the core can be made of aluminum. The wall elements each have an outer side and an inner side as well as a lower end in the roller attachment portion and an upper end in the support strip attachment portion, with the roller attachment portion lying along the vertical axis in the direction of the sliding surface and the support strip attachment portion lying in the direction of the shoe. The roller attachment portion further comprises a front portion, a middle portion, and a rear portion. In some embodiments, the wall elements in the front and/or rear portion may have a curvature in the vertical direction, i.e. in the direction of the ice hockey blade, thus emulating the shape of an ice hockey blade, for example. In addition, the curvatures in the front and/or rear portion can have a matching or differing curvature curve.
Preferably, the two opposing wall elements extend in a vertical direction parallel along the vertical axis. In other words, the two opposing wall elements have an intermediate space of constant size along the vertical axis between the lower end and the upper end. Alternatively, the first and/or the second wall element can run in the vertical direction at an angle to the vertical axis, whereby the angle can be between 0.5° and 5°, preferably between 1° and 3°, inclined inwards or inclined outwards to the vertical axis, which can lead to a decrease or an increase in the size of the intermediate space between the two wall elements.
In preferred embodiments, the wall elements may contain recesses to reduce weight. Preferably, these recesses are located on the roller attachment portion between the bearings inserted into the wall elements, which are described in detail below. Alternatively, the recesses can also be located on the support strip attachment portion. Preferably, all recesses have the same shape and dimensions, whereby the recesses can be in the form of a circular arc, a semi-oval, in a polygonal shape or in any concave shape. Alternatively, however, the individual recesses can also have different shapes and dimensions. If the recesses are located in the roller attachment portion, the dimensions of the recesses are preferably selected so that their height in the vertical direction, i.e. in the direction of the shoe, does not exceed the center of the bearings inserted in the wall elements. If, on the other hand, the recesses are provided in the support attachment portion, the dimensions of the recesses are preferably selected so that the height of the recesses in the vertical direction, i.e. in the direction of the rolling surface, does not exceed the center point of the drill holes provided in the wall elements, which are described in detail below.
Furthermore, the wall elements in the roller attachment portion contain breakthroughs or blind holes into which the bearings are inserted, with the number of breakthroughs or blind holes in each wall element corresponding to the number of rollers. The breakthroughs/blind holes can be made in a vertical direction with a spacing of between 4 mm and 15 mm from the lower end, whereby the vertical spacing depends on the diameter of the rollers. The spacing between the breakthroughs/blind holes in the longitudinal direction depends on the number of rollers, the diameter of the rollers and the spacing between the individual rollers and is between 18 mm and 45 mm. The diameter of the breakthroughs/blind holes is between 6 mm and 10 mm and is designed so that the respective bearings can be inserted into the breakthroughs/blind holes by means of a press-fit. For additional adhesion, the bearings press-fitted into the breakthroughs/blind holes can be attached with a suitable instant adhesive. The bearings inserted into the breakthroughs/blind holes can be plain or rolling bearings, whereby rolling bearings, in particular ball bearings, are preferably used. The outer diameter of the ball bearings used can be between 6 mm and 10 mm, preferably between 8 mm and 9.5 mm, the diameter of the bearing bore between 3 mm and 7 mm, preferably between 4.5 mm and 5.5 mm and the nominal width between 1.5 mm and 7.5 mm, preferably between 2 mm and 7 mm, particularly preferably at 4 mm. Furthermore, in embodiments in which the wall elements have breakthroughs, closed bearings can be used on the outside of the wall element.
In order to connect the individual wall elements and the support strip between them, which is described in detail below, with suitable attachment means, the wall elements have drill holes in the support strip attachment portion area. Preferably, one wall element in each case has drill holes with conical recesses for attaching countersunk screws, for example, while the drill holes in the second wall element each have a thread. In an embodiment that can be produced more cost-effectively, rivets are used instead of a screw connection, preferably with chrome steel screws.
The rollers arranged between the two wall elements with a roller spacing of 0.5 mm and 3.5 mm, preferably between 1 mm and 3 mm, have the shape of a disc with a diameter of between 15 mm and 40 mm, preferably between 20 mm and 30 mm, and a thickness of between 0.5 mm and 4 mm, preferably between 2.5 mm and 4 mm for ice hockey, bandy and figure skating and preferably between 0.9 mm and 2 mm for speed skating. The rollers are each arranged centrally on an axle with an axle diameter of between 3.0 mm and 7.0 mm and an axle length of between 5.0 mm and 13 mm, whereby the axle and the roller can either be formed in one piece or the axle can be attached to the respective roller by means of a press-fit. In addition, in preferred embodiments, a form-fit means, preferably in the form of a recess, can be arranged at the end of each axle in the transverse direction. The form-fit means can be brought into connection with the corresponding form-fit means and thus to a form-fit and serves to ensure the rotation of the rollers when grinding the rolling surfaces. Furthermore, spacer discs with a maximum outer diameter of 10 mm and a maximum thickness of 0.6 mm are preferably fitted on both sides of the rollers. The spacer discs can be formed in one piece with the respective roller and the corresponding axle or the spacer discs are attached to the respective axle on both sides of the rollers by means of a press-fit, whereby the inner diameter of the spacer discs is then selected so that the spacer disc can be attached to the axle by means of a press-fit.
The rollers, or rather the axles, are inserted into the bearings of the two opposing wall elements, whereby the number of rollers arranged one behind the other depends on the wall element length, the roller diameter, the spacing between the individual rollers and the type of ice sport. The rollers are arranged between the two wall elements in such a way that the contact points of the rolling surfaces in the middle portion preferably lie on a curve, whereby the radius of the curve can be between 1500 mm and infinity. Furthermore, the rollers in the front portion and in the rear portion are arranged between the two wall elements in such a way that the contact points of the rolling surfaces in the front portion and/or in the rear portion each lie on a curve, whereby the radii of the curves can be between 100 mm to infinity.
Furthermore, the rollers have a rolling surface which comes into contact with a sliding surface, such as a synthetic ice surface, wherein the rolling surfaces each have a grinding, preferably a hollow grinding or a surface grinding. The grinding is applied to the rolling surface of the rollers in such a way that at least one grinding edge of the ground rolling surface is aligned with a side surface of the roller. It is understood that the hollow grinding corresponds to a hollow grinding of a skate blade known to the skilled person and thus comprises a concave surface with a radius and two outer grinding edges. The surface grinding corresponds to a surface grinding of a speed skate blade known to the skilled person and can comprise an angle in relation to the sliding plane. Such a hollow or surface grinding is applied in order to reduce the frictional resistance to the sliding surface and thus generate higher speeds. The hollow grinding as well as the surface grinding can be the same for all rollers or alternatively, depending on the position of the roller on the sliding body, designed differently in order to achieve optimum gliding behavior on synthetic ice.
In preferred embodiments, the individual rollers can contain a plurality of recesses for weight reduction. The recesses can also be designed as breakthroughs. The recesses are preferably arranged symmetrically around the axle. The recesses can have a circular or elliptical shape or alternatively a polygonal shape. The recesses are located on the side surfaces of the rollers and preferably do not take up more than 50% of the total area of the side surface. For a roller diameter of 20-30 mm, 8 cylindrical breakthroughs with a diameter of 3 to a maximum of 5 mm have proven to be advantageous, whereby preferably no more than 50% of the total side surface of the roller is occupied by the breakthroughs. According to an advantageous embodiment, the diameter of the 8 breakthroughs is 4 mm with a roller diameter of 25 mm.
In further embodiments, the rollers in a sliding body are arranged between the first and second wall elements along the roller attachment portion such that the contact points of the rolling surfaces of three to seven rollers in the middle portion lie on a straight line. In other words, the rollers in the middle portion are arranged one behind the other such that the contact points of the rolling surfaces which come into contact with the sliding surface, in particular the synthetic ice surface, lie on a straight line. If not all of the rollers arranged in the middle portion lie on a straight line, the rollers that form the middle rollers in the middle portion preferably lie on a straight line. In ice hockey, for example, the number of rollers lying on a straight line is defined by the driving behavior and the player position. The smaller the contact surface, i.e. the fewer rollers in the middle portion on a straight line, the more maneuverable and easy to turn the sliding body is, which may be desirable for a forward position, for example. The more rollers there are in the middle portion on a straight line, the larger the contact surface, the more stable the stance on the sliding body, which may be desirable for a defensive position, for example.
In further embodiments, the rollers are arranged in a sliding body between the first and second wall elements along the roller attachment portion such that the contact points of the rolling surfaces in the front and/or rear portion lie on a front and/or rear line of curvature. The front and rear lines of curvature can either have the same or a different radius of curvature, whereby the radius of curvature can be between 100 mm and 1000 mm or, for speed skating, between 23 m and 27° m. The smaller the radius of curvature, the stronger the curvature curve. In other words, the smaller the radius of curvature, the stronger the curvature in the vertical direction, i.e. when used in the direction of the shoe. In ice hockey, for example, the curvature allows the sliding body to turn in a different direction on synthetic ice. In speed skating, for example, a very slight curvature in the front and/or rear portion can help to enable better cornering.
In further embodiments, the rollers are arranged in a sliding body between the first and second wall elements along the roller attachment portion such that the contact points of the rolling surfaces of all rollers lie on a straight line. Such an embodiment is preferably used in speed skating.
In further embodiments, the rollers are arranged in a sliding body between the first and second wall elements along the roller attachment portion in such a way that the rollers have a roller protrusion of between 20% and 40%, preferably between 25% and 35%. Whereby, the roller protrusion relates to the proportion of the roller diameter of the respective roller which, in the direction of the sliding plane, is not accommodated in the intermediate space formed by the two opposing wall elements. It is understood that due to the rotational movement of the rollers, the roller protrusion is always that portion of the roller diameter which is not located in the intermediate space formed by the two wall elements at this point in time.
In further embodiments, the rollers are arranged in a sliding body between the first and second wall elements along the roller attachment portion such that the individual rollers have the same roller protrusion. In a preferred embodiment, the roller protrusion of the sliding body is between 25% and 35%, wherein the sliding body has 10 to 14 rollers arranged one behind the other with a roller thickness of 2.5 mm to 4 mm and a roller diameter of 20 mm to 30 mm. In a further preferred embodiment, the roller protrusion of the sliding body is between 25% and 35%, wherein the sliding body has 15 to 19 rollers arranged one behind the other with a roller thickness of 0.9 mm to 2 mm and a roller diameter of 20 mm to 30 mm. In a further embodiment, the roller protrusion of the sliding body is between 25% and 35%, wherein the sliding body has 8 to 12 rollers arranged one behind the other with a roller thickness of 2.5 mm to 4 mm and a roller diameter of 20 mm to 30 mm and, in the front portion of the roller attachment portion, a non-movable prong element, which is described in detail below, with a thickness of 2.5 mm to 4 mm.
In further embodiments, the rollers are arranged in a sliding body between the first and second wall elements along the roller attachment portion in such a way that at least one roller has a different roller protrusion relative to the other rollers. If there are several rollers with a differing roller protrusion, these roller protrusions can also differ from one another.
In further embodiments, the rollers in a sliding body each have the same roller diameter. In a preferred embodiment, the roller diameter is between 20 mm and 30 mm with a roller thickness of between 2.5 mm and 4 mm. In a further preferred embodiment, the roller diameter is between 20 mm and 30 mm with a roller thickness of between 0.9 mm and 2 mm.
In further embodiments, the rollers in a sliding body each have the same roller thickness, the roller thickness for speed skating preferably being between 0.9 mm and 2 mm and for ice hockey, bandy and figure skating preferably between 2.5 mm and 4 mm.
In further embodiments, the rollers are arranged one behind the other with the same spacing. In a preferred embodiment, the spacing between the rollers arranged one behind the other is between 1 mm and 3 mm, wherein the sliding body in this embodiment has 10 to 14 rollers arranged one behind the other with a roller diameter of 20 mm and 30 mm and a roller thickness of 2.5 mm and 4 mm. In a further preferred embodiment, the spacing between the rollers arranged one behind the other is between 1 mm and 3 mm, the sliding body in this embodiment having 15to 19 rollers arranged one behind the other with a roller thickness of 0.9 mm to 2 mm and a roller diameter of 20 mm to 30 mm.
In further embodiments, the number of rollers is between 7 and 22, whereby the number of rollers depends on the length of the wall elements, the roller diameter and the spacing between the rollers arranged one behind the other. Furthermore, the number of rollers differs depending on the sport and is between 10 and 17, preferably between 10 and 14, for ice hockey and bandy sports, between 15 and 22, preferably between 15 and 19, for speed skating and between 7 and 14, preferably between 7 and 12, for figure skating. For figure skating, the two outermost rollers in the front portion of the roller attachment portion can be replaced by a non-movable prong element, the thickness of the prong element in the transverse direction corresponding to the roller thickness selected in this embodiment.
In further embodiments, the grinding of the rolling surface has a hollow grinding radius of between 9 mm and 26 mm or a surface grinding with an angle to the sliding surface of between 0° and 40°. In preferred embodiments, the hollow grinding radii are between 9 mm to 10 mm or between 12 mm to 13 mm or between 15 mm to 16 mm or between 25 mm to 26 mm, and correspond to the hollow grinding radii of a skate blade for use in ice sports such as ice hockey. Furthermore, the angle of the surface grinding is preferably between 0° and 30° and corresponds to a surface grinding of a skate blade for use in speed skating.
In further embodiments, the rollers are made of a metal alloy, hard plastic or ceramic. The metal alloy preferably consists of a stainless steel with a Rockwell hardness of between 50 and 65, preferably between 54 and 62; particularly preferably between 54 and 58, preferably vacuum-hardened. In order to increase the durability of the rollers, the rollers can be provided with an additional coating, such as a hardness-determining coating of titanium and/or a grinding sharpness-determining coating and/or a QPQ coating.
In further embodiments, the individual rollers in a sliding body are exchangeable. In other words, the wall elements, the rollers with the corresponding axle, and the support strip, which is described in detail below, are connected to one another in the sliding body in such a way that at least one wall element is designed in such a way that its connection can be released and thus the rollers can be exchanged. It is understood that the rollers including the axles are replaced, as the axles and the rollers are formed in one piece or the axles are attached to the roller by means of a press-fit.
In further embodiments, a support strip is arranged between the first and the second wall element. The support strip has an upper end and a lower end and is typically formed in one piece. The support strip can be made of carbon reinforced plastic fibers, metals or metal alloys, for example. If the support strip is made of a metal alloy, this metal alloy is preferably an aluminum alloy. If the support strip consists of more metal alloys, the support strip preferably has a sandwich construction due to the arrangement of the alloys. The sandwich construction can, for example, consist of a steel-aluminum-steel sandwich construction. Preferably, the outer steel layers have a thickness of 0.2 to 0.5 mm with a total thickness of the steel-aluminum-steel sandwich of 2.8-2.9 mm.
The support strip extends along the longitudinal direction and preferably corresponds in its length and curvature to the length and curvature of the wall elements and thus to the length of the sliding body. The thickness of the support strip in the transverse direction can depend on the length of the axle and is preferably selected so that the wall elements have an intermediate space of constant size along the vertical axis due to the arrangement of the axles inserted in the bearings of the wall elements and the support strip thickness.
Furthermore, the support strip contains support strip mounting elements which are attached in a vertical direction at the upper end of the support strip, i.e. in use in the direction of the boot. The support strip mounting elements form the matching counterpart for attachment to the mount of the respective ice sports appliance, in particular a skate blade, and can be detachably connected to a compatible support mounting element of the respective boot, whereby the support strip mounting elements correspond to the known support mounting elements of skate blades, where the connection can be detached and connected without considerable effort. Depending on the type of sport and the position of the player as well as the design of the complementary mount on the ice skate, the support strip mounting elements are available in different embodiments and numbers. In addition, the support strip mounting elements can be provided with recesses for additional weight reduction.
In further embodiments, additional spacers can be attached to both sides of the support strip.
In preferred embodiments, the support strip can contain support strip recesses in the vertical direction at the lower end, i.e. when used in the direction of the sliding plane, the number of support strip recesses corresponding to the number of rollers in a sliding body. The support strip recesses can be in the form of a circular arc and are dimensioned in such a way that the rollers with the respective diameter can be partially accommodated in the support strip recess with a spacing of 18 mm to 45 mm from the support strip recess.
To connect the support strip to the wall elements, the support strip has support strip drill holes, whereby the diameter and number of support strip drill holes in the support strip depend on the diameter and number of drill holes in the wall elements. In addition, the positions of the support strip drill holes must match the positions of the drill holes in the wall elements so that the support strip can be fitted correctly between the two wall elements. Furthermore, the support strip is arranged and connected between the two wall elements in such a way that the support strip mounting elements form a support strip mounting element protrusion in the vertical direction, i.e. in use in the direction of the boot, so that the support strip mounting elements can be inserted into the matching counterpart of the respective ice sports appliance, in particular the ice skate, for attachment.
In further embodiments, the wall elements consist of at least one metal alloy. If the wall elements consist of only one metal alloy, they preferably consist of an aluminum alloy such as an aluminum alloy of alloy group 7000.
In further embodiments, the wall elements have a sandwich construction through the metal alloys. Here, the respective top layers are preferably made of a steel alloy such as a steel alloy of material group 1.2343 or 1.2312 or 1.2112 and the core is made of an aluminum alloy such as an aluminum alloy of alloy group 7000. According to a further advantageous embodiment, the outer steel layers of the steel-aluminum-steel sandwich have a thickness of 0.2 to 0.5 mm with a total thickness of the sandwich construction of 2.0 to 2.5 mm. A preferred material for the steel layers is 1.4043.
In further embodiments, the wall elements are made of carbon fiber reinforced plastic. Advantageously, recycled carbon material or Carbotylene with a thickness of 2 to 3 mm is used.
Aspects of the invention are explained in more detail with reference to the embodiments shown in the following figures and the corresponding description.
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| Number | Date | Country | Kind |
|---|---|---|---|
| CH000294/2022 | Mar 2022 | CH | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2023/056959 | 3/17/2023 | WO |
