CN220841989U - Anti-counterfeiting element and anti-counterfeiting product - Google Patents
Anti-counterfeiting element and anti-counterfeiting product Download PDFInfo
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- CN220841989U CN220841989U CN202322740415.XU CN202322740415U CN220841989U CN 220841989 U CN220841989 U CN 220841989U CN 202322740415 U CN202322740415 U CN 202322740415U CN 220841989 U CN220841989 U CN 220841989U
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- reflective layer
- metal reflective
- transparent substrate
- metal
- reflecting layer
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- 239000002184 metal Substances 0.000 claims abstract description 148
- 239000000758 substrate Substances 0.000 claims abstract description 61
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000005019 vapor deposition process Methods 0.000 claims 1
- 230000004075 alteration Effects 0.000 abstract description 8
- 239000003086 colorant Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 12
- 239000006249 magnetic particle Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 230000000007 visual effect Effects 0.000 description 6
- 239000002131 composite material Substances 0.000 description 5
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 238000001579 optical reflectometry Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000002310 reflectometry Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000007738 vacuum evaporation Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 108091026890 Coding region Proteins 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000307 polymer substrate Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
Abstract
The utility model discloses an anti-counterfeiting element and an anti-counterfeiting product, wherein the anti-counterfeiting element comprises a first transparent substrate, a second transparent substrate and at least one covering structure, the first transparent substrate is provided with a first surface, the second transparent substrate is provided with a second surface, the first surface and the second surface are oppositely arranged, the covering structure comprises a first metal reflecting layer, a second metal reflecting layer and a first magnetic area, the first metal reflecting layer is arranged on the first surface, the second metal reflecting layer is arranged on the second surface, the first magnetic area is positioned between the first metal reflecting layer and the second metal reflecting layer, and the first metal reflecting layer and the second metal reflecting layer both cover the first magnetic area; the first metal reflecting layer and the second metal reflecting layer have the same reflection optical density. The anti-counterfeiting element has no chromatic aberration when being observed from the first transparent substrate side, has no chromatic aberration when being observed from the second transparent substrate side, and has consistent colors of the first transparent substrate side and the second transparent substrate side.
Description
Technical Field
The utility model relates to the technical field of anti-counterfeiting, in particular to an anti-counterfeiting element and an anti-counterfeiting product.
Background
Value documents such as banknotes, stocks, stamps, checks, air tickets, ticket labels and the like are often provided with security elements which ensure the authenticity of the information carrier and which at the same time can also be used to prevent illegal copying. The magnetic material is widely applied in the anti-counterfeiting field, the anti-counterfeiting element with the magnetic material is fully or partially embedded into paper, and the magnetic sensor can detect the coding sequence of the magnetic information, so that the authenticity of the ticket face can be judged, and meanwhile, the ticket face can be cleared.
The magnetic information is generally composed of dark color or black material, after the anti-counterfeiting element with the magnetic information is embedded into paper, the embedded part can be in black line, in order to improve the anti-counterfeiting safety of the anti-counterfeiting element, the existing method generally adopts printing or coating metal ink to cover the anti-counterfeiting information layer, but due to the characteristics of the metal ink, when light irradiates the metal ink, the light is diffusely reflected, and the non-covered area of the security element is specularly reflected, and due to different reflectivities, visual chromatic aberration of the security element occurs, and the aesthetic property of the security element after the security element is embedded into the paper is affected.
Disclosure of utility model
Therefore, the technical problem to be solved by the utility model is that printing or coating metal ink is adopted to cover the anti-counterfeiting information layer in the prior art, but due to the characteristics of the metal ink, when the metal ink is irradiated by light rays, the metal ink is diffusely reflected, and the uncovered area of the security element is specularly reflected, and due to different reflectivities, the security element has visual chromatic aberration, and the aesthetic property of the security element after being embedded into paper is affected.
To this end, the utility model provides a security element comprising:
a first transparent substrate having a first surface;
A second transparent substrate having a second surface, the first surface and the second surface being disposed opposite;
The shielding structure comprises a first metal reflecting layer, a second metal reflecting layer and a first magnetic area, wherein the first metal reflecting layer is arranged on the first surface, the second metal reflecting layer is arranged on the second surface, the first magnetic area is positioned between the first metal reflecting layer and the second metal reflecting layer, and the first metal reflecting layer and the second metal reflecting layer both cover the first magnetic area;
The first metal reflecting layer and the second metal reflecting layer have the same reflection optical density.
Optionally, in the above anti-counterfeiting element, the covering structure further includes a second magnetic region, the second magnetic region is disposed between the first metal reflective layer and the second metal reflective layer, and the first metal reflective layer and the second metal reflective layer both cover the second magnetic region.
Optionally, in the above-mentioned security element, the first magnetic region and the second magnetic region are disposed at intervals or partially overlap.
Optionally, in the above-mentioned security element, the pulse orientations of the first magnetic region and the second magnetic region are opposite or identical.
Optionally, in the above anti-counterfeiting element, the first metal reflective layer is a set first pattern, and the second metal reflective layer is a set second pattern.
Optionally, in the anti-counterfeiting element, the first metal reflecting layer and the second metal reflecting layer form a set pattern by a vacuum local evaporation process.
Optionally, in the above-mentioned security element, the orthographic projection of the first metal reflective layer on the second surface covers at least a part of the second metal reflective layer.
Optionally, the anti-counterfeiting element further comprises an optical diffraction layer, wherein the optical diffraction layer is located between the second surface and the second metal reflection layer, and the optical diffraction layer covers the second metal reflection layer.
The utility model also provides a false proof product comprising the false proof element.
The technical scheme provided by the utility model has the following advantages:
1. The utility model provides an anti-counterfeiting element, which comprises a first transparent substrate, a second transparent substrate and at least one covering structure, wherein the first transparent substrate is provided with a first surface, the second transparent substrate is provided with a second surface, the first surface and the second surface are oppositely arranged, the covering structure comprises a first metal reflecting layer, a second metal reflecting layer and a first magnetic area, the first metal reflecting layer is arranged on the first surface, the second metal reflecting layer is arranged on the second surface, the first magnetic area is positioned between the first metal reflecting layer and the second metal reflecting layer, and the first metal reflecting layer and the second metal reflecting layer are both covered on the first magnetic area. The first metal reflecting layer covers the first magnetic area, so that light can only irradiate on the first metal reflecting layer through the first transparent substrate, and when the light irradiates on the first metal reflecting layer through the first transparent substrate, the first metal reflecting layer reflects the light, and the light reflectivity of the first metal reflecting layer is the same, so that visual chromatic aberration caused by observation from the side of the first transparent substrate is avoided; the second metal reflecting layer covers the first magnetic area, so that light can only irradiate onto the second metal reflecting layer through the second transparent substrate, and when the light irradiates onto the second metal reflecting layer through the second transparent substrate, the light is reflected by the second metal reflecting layer, and the light reflectivity of the second metal reflecting layer is the same, so that visual chromatic aberration caused by observation from the second transparent substrate side is avoided; according to the anti-counterfeiting element disclosed by the utility model, the first transparent substrate side and the second transparent substrate side are observed without color difference, and the reflection optical densities of the first metal reflection layer and the second metal reflection layer are the same, so that the colors observed from the anti-counterfeiting element through the first transparent substrate side and the second transparent substrate side are consistent, and the aesthetic property of the anti-counterfeiting element embedded in paper is improved.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a security element provided in example 1 of the present utility model;
FIG. 2 is a schematic view of the security element provided in example 2 of the present utility model;
FIG. 3 is a schematic view of a security element provided in example 3 of the present utility model;
fig. 4 is a schematic diagram of magnetic encoding waveform information of the security element provided in embodiment 1 of the present utility model.
Reference numerals illustrate:
1. a first transparent substrate;
2. a second transparent substrate;
31. A first metal reflective layer; 32. a second metal reflective layer; 33. a first magnetic region; 34. a second magnetic region; 35. an optical diffraction layer.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Example 1
The anti-counterfeiting element provided in this embodiment, as shown in fig. 1, includes a first transparent substrate 1, a second transparent substrate 2 and at least one covering structure, the first transparent substrate 1 has a first surface, the second transparent substrate 2 has a second surface, the first surface and the second surface are opposite, the covering structure includes a first metal reflective layer 31, a second metal reflective layer 32 and a first magnetic area 33, the first metal reflective layer 31 is disposed on the first surface, the second metal reflective layer 32 is disposed on the second surface, the first magnetic area 33 is located between the first metal reflective layer 31 and the second metal reflective layer 32, and the first metal reflective layer 31 and the second metal reflective layer cover the first magnetic area 33.
In the anti-counterfeiting element provided by the embodiment, since the first metal reflective layer 31 covers the first magnetic region 33, light can only irradiate onto the first metal reflective layer 31 through the first transparent substrate 1, and when the light irradiates onto the first metal reflective layer 31 through the first transparent substrate 1, the light is reflected by the first metal reflective layer 31, and the light reflectivity of the first metal reflective layer 31 is the same, so that visual chromatic aberration caused when the first transparent substrate 1 is observed is avoided; since the second metal reflective layer 32 covers the first magnetic region 33, light can only irradiate onto the second metal reflective layer through the second transparent substrate 2, and when light irradiates onto the second metal reflective layer 32 through the second transparent substrate 2, the light is reflected by the second metal reflective layer 32, and the light reflectivity of the second metal reflective layer 32 is the same, so that visual chromatic aberration caused when the second transparent substrate 2 is observed is avoided; according to the anti-counterfeiting element, the first transparent substrate 1 side and the second transparent substrate 2 side are observed without color difference, and the reflection optical densities of the first metal reflection layer 31 and the second metal reflection layer 32 are the same, so that the colors observed from the anti-counterfeiting element through the first transparent substrate 1 side and the second transparent substrate 2 side are consistent, and the attractiveness of the anti-counterfeiting element after being embedded into paper is improved.
In the anti-counterfeiting element provided in this embodiment, as shown in fig. 1, the material of the first transparent substrate 1 may be PET, the material of the first transparent substrate 1 may also be OPP, the material of the first transparent substrate 1 may also be PMMA, the material of the first transparent substrate 1 may also be PE or other transparent plastic polymer substrates, the material of the first transparent substrate 1 in this embodiment is PVC material, and a transparent film layer is formed by PVC material, and the film layer is the first transparent substrate 1; the second transparent substrate 2 and the first transparent substrate 1 are the same in size, shape, dimension and material. The first transparent substrate 1 is located right above the second transparent substrate 2, the lower surface of the first transparent substrate 1 is a first surface, and the upper surface of the second transparent substrate 2 is a second surface, namely the first surface and the second surface are oppositely arranged. The first metal reflecting layer 31 is formed on the first surface, the area of the first surface is greater than or equal to the area of the first metal reflecting layer 31, the second metal reflecting layer 32 is formed on the second surface, the area of the second surface is greater than or equal to the area of the second metal reflecting layer 32, the first magnetic region 33 is formed on the lower surface of the first metal reflecting layer 31 by regularly distributing a plurality of magnetic particles, the plurality of magnetic particles can be coated on the lower surface of the first metal reflecting layer 31 by printing, as an alternative implementation mode, the first magnetic region 33 can also be formed on the upper surface of the second metal reflecting layer 32, the magnetic particles can be a composite of a magnetic material and a magnetic conductive material, the magnetic particles can also be a magnetic conductive material, and the magnetic particles in this embodiment are magnetic materials. The first metal reflecting layer 31 and the second metal reflecting layer 32 are the same in material, that is, the first metal reflecting layer 31 and the second metal reflecting layer 32 are the same in reflection optical density, so that after the anti-counterfeiting element is embedded into paper, the colors observed from the front surface and the back surface of the paper are consistent, and the aesthetic property of the anti-counterfeiting element embedded into the paper is improved.
As shown in fig. 1, the anti-counterfeiting element provided in this embodiment, the covering structure further includes a second magnetic region 34, the second magnetic region 34 is formed by a plurality of magnetic particles regularly distributed on the lower surface of the first metal reflective layer 31, the plurality of magnetic particles may be coated on the upper surface of the second metal reflective layer 32 by printing, as an alternative embodiment, the second magnetic region 34 may also be formed on the lower surface of the first metal reflective layer 31, the magnetic particles may be a composite of a magnetic material and a magnetic conductive material, and the magnetic particles may also be a magnetic conductive material.
In the anti-counterfeiting element provided in this embodiment, as shown in fig. 1 and fig. 4, the first magnetic area 33 and the second magnetic area 34 are arranged at intervals, the identification device is used for detecting the anti-counterfeiting element, the identification device can be a banknote counter or other financial device, when the identification device detects the anti-counterfeiting element, as shown in fig. 4, the pulse orientation of the first magnetic area 33 is m a, the pulse orientation of the second magnetic area 34 is m b, the first magnetic area 33 and the second magnetic area 34 have opposite pulse orientations, and the maximum pulse amplitude of the waveforms of the magnetic encoding signals detected by the first magnetic area 33 and the second magnetic area 34 are the same, and are all |y|. The waveform of the magnetic coding signal detected by the identification device is used as anti-counterfeiting information for distinguishing the authenticity of the anti-counterfeiting product with the anti-counterfeiting element.
In the anti-counterfeiting element provided in this embodiment, as shown in fig. 1, two covering structures are spaced between the first metal reflective layer 31 and the second metal reflective layer 32, the number of the covering structures is not limited in this embodiment, and the number of the covering structures can be adjusted as required by a person skilled in the art.
The anti-counterfeiting element provided in this embodiment can design the patterns of the first metal reflective layer 31 and the second metal reflective layer 32 according to a trademark, an anti-counterfeiting mark, a personalized pattern, characters or other common marks, the first metal reflective layer 31 is a set first pattern, the second metal reflective layer 32 is a set second pattern, the first pattern and the second pattern can be identical or different, and in practical application, that is, when the anti-counterfeiting element is embedded in a banknote, the first pattern and the second pattern are face numbers of the banknote.
In the anti-counterfeiting element provided by this embodiment, the material of the first metal reflective layer 31 may be aluminum, silver, copper, tin, chromium or other alloys, in this embodiment, aluminum is adopted, the second metal reflective layer is the same as the material of the first metal reflective layer 31, the first metal reflective layer 31 is formed on the first surface by vacuum partial evaporation, in an alternative embodiment, the first metal reflective layer 31 is formed into a whole metal layer by vacuum evaporation, then a protective adhesive is printed on the whole metal layer according to a set pattern, then a chemical method is applied to remove the metal without the protective portion to obtain the set pattern, and the second metal reflective layer 32 may be formed on the second surface by vacuum partial evaporation or by vacuum evaporation combined with the chemical method.
In the anti-counterfeiting element provided in this embodiment, the first metal reflective layer 31 is located directly above the second metal reflective layer 32, there is an overlapping portion between the first metal reflective layer 31 and the second metal reflective layer 32, and the first magnetic region 33 and the second magnetic region 34 are located at the overlapping portion, where when the pattern of the first metal reflective layer 31 is the same as the pattern of the second metal reflective layer 32, the first metal reflective layer 31 and the second metal reflective layer 32 completely overlap.
In the anti-counterfeiting element provided in this embodiment, first, an aluminum filament is formed on the lower surface of the first transparent substrate 1 through a vacuum partial evaporation process, another aluminum filament is formed on the upper surface of the second transparent substrate 2 through a vacuum partial evaporation process, magnetic particles in the first magnetic region 33 are coated and printed on the lower surface of the first metal reflecting layer 31 through a composite glue, magnetic particles in the second magnetic region 34 are coated and printed on the upper surface of the second metal reflecting layer 32 through a composite glue, and then the first transparent substrate 1 and the second transparent substrate 2 are glued together through a composite glue.
Example 2
This embodiment provides a security element, as shown in fig. 2, which differs from that of embodiment 1 in that: in one of the cover structures, the length of the second metal reflective layer 32 is greater than the length of the first metal reflective layer 31, the second magnetic region 34 and the first magnetic region 33 are stacked in sequence, the first magnetic region 33 is located above the second magnetic region 34, the first magnetic region 33 and the second magnetic region 34 have overlapping portions, and the first magnetic region 33 and the second magnetic region 34 have the same pulse orientation as each other when the identification device detects the security element.
Example 3
This embodiment provides a security element, as shown in fig. 3, which differs from that of embodiment 1 in that: the length of the second metal reflective layer 32 in one of the masking structures is greater than the length of the first metal reflective layer 31.
The anti-counterfeiting element provided in this embodiment further includes an optical diffraction layer 35, where the optical diffraction layer 35 is located between the second surface and the second metal reflective layer 32, and the optical diffraction layer 35 covers the second metal reflective layer 32. When light is irradiated to the optical diffraction layer 35 through the second substrate, a rich color is generated.
Example 4
This embodiment provides a security product comprising the security element of embodiment 1 or embodiment 2 or embodiment 3.
The color of the front surface and the color of the back surface of the part, embedded into the anti-counterfeiting element, of the anti-counterfeiting product provided by the embodiment are consistent, so that the attractiveness of the anti-counterfeiting product is improved.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (9)
1. A security element comprising:
A first transparent substrate (1), the first transparent substrate (1) having a first surface;
A second transparent substrate (2), the second transparent substrate (2) having a second surface, the first surface and the second surface being disposed opposite;
At least one capping structure comprising a first metal reflective layer (31), a second metal reflective layer (32) and a first magnetic region (33), the first metal reflective layer (31) being disposed on the first surface, the second metal reflective layer (32) being disposed on the second surface, the first magnetic region (33) being located between the first metal reflective layer (31) and the second metal reflective layer (32), and the first metal reflective layer (31) and the second metal reflective layer (32) both covering the first magnetic region (33);
the first metal reflective layer (31) and the second metal reflective layer (32) have the same reflective optical density.
2. The security element of claim 1, wherein the covering structure further comprises a second magnetic region (34), the second magnetic region (34) is disposed between the first metal reflective layer (31) and the second metal reflective layer (32), and the first metal reflective layer (31) and the second metal reflective layer (32) both cover the second magnetic region (34).
3. A security element according to claim 2, characterized in that the first magnetic region (33) and the second magnetic region (34) are arranged at intervals or partially overlap.
4. A security element according to claim 3, characterized in that the pulse orientations of the first magnetic region (33) and the second magnetic region (34) are opposite or identical.
5. The security element of claim 1 or 4, characterized in that the first metal reflective layer (31) is a set first pattern and the second metal reflective layer (32) is a set second pattern.
6. The security element of claim 5, wherein the first metal reflective layer (31) and the second metal reflective layer (32) are formed into a set pattern by a vacuum partial vapor deposition process.
7. A security element according to claim 6, characterized in that the orthographic projection of the first metal reflective layer (31) on the second surface covers at least part of the second metal reflective layer (32).
8. The security element of claim 1 or 7, further comprising an optical diffraction layer (35), the optical diffraction layer (35) being located between the second surface and the second metal reflective layer (32), the optical diffraction layer (35) covering the second metal reflective layer (32).
9. A security product comprising a security element as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322740415.XU CN220841989U (en) | 2023-10-12 | 2023-10-12 | Anti-counterfeiting element and anti-counterfeiting product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322740415.XU CN220841989U (en) | 2023-10-12 | 2023-10-12 | Anti-counterfeiting element and anti-counterfeiting product |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220841989U true CN220841989U (en) | 2024-04-26 |
Family
ID=90744032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322740415.XU Active CN220841989U (en) | 2023-10-12 | 2023-10-12 | Anti-counterfeiting element and anti-counterfeiting product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220841989U (en) |
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2023
- 2023-10-12 CN CN202322740415.XU patent/CN220841989U/en active Active
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