CN210641258U - Electromagnetic shielding composite structure - Google Patents
Electromagnetic shielding composite structure Download PDFInfo
- Publication number
- CN210641258U CN210641258U CN201921805163.1U CN201921805163U CN210641258U CN 210641258 U CN210641258 U CN 210641258U CN 201921805163 U CN201921805163 U CN 201921805163U CN 210641258 U CN210641258 U CN 210641258U
- Authority
- CN
- China
- Prior art keywords
- layer
- wave
- electromagnetic
- composite structure
- shielding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model provides an electromagnetic shielding composite construction. This electromagnetic shield composite construction is including range upon range of setting in proper order: wave-transparent layer, wave-absorbing layer, conductive rubber layer and metal shielding layer. Wherein, wave-permeable layer plays the guard action to absorbing layer, wave-permeable layer makes the electromagnetic wave can see through and by absorbing layer multiple scattering and absorption, increase the eddy current loss, free damping electromagnetic shield structure is constituteed to conductive rubber layer and metal shielding layer, absorb the reflection to the electromagnetic wave, and further increase absorbing layer's absorbing action, and conductive rubber layer and metal shielding layer combination can realize effectual electromagnetic shield to the electromagnetic wave in the broad frequency channel scope, above each layer mutually supports and reaches the multi-level effective shielding of electromagnetic wave, prevent that single structure from leading to the electromagnetic wave to reveal the problem, it is more thorough to have reached the electromagnetic wave shielding, and the wide frequency channel scope all has good electromagnetic shielding performance's effect, use safelyr.
Description
Technical Field
The utility model relates to an electromagnetic shield technical field, concretely relates to electromagnetic shield composite construction.
Background
The Electromagnetic Compatibility (EMC) is one of the most important indexes of product quality, and means that some electronic equipment does not interfere with other equipment and is not influenced by other equipment. Electromagnetic shielding refers to a measure for reducing the field intensity caused by some sources in a certain area of space, and is a main means for ensuring good electromagnetic compatibility of electronic equipment. The electromagnetic shield is mainly used for suppressing the influence of a high-frequency electromagnetic field, so that an interference field forms a vortex in the shield and generates reflection on an interface between the shield and a protected space, thereby greatly weakening the field intensity value of the interference field in the protected space and achieving the electromagnetic shielding effect.
In most cases, the electromagnetic shielding body can be made of high-conductivity metals such as copper and aluminum, electromagnetic waves are reflected and absorbed on the surface of the metal to achieve the electromagnetic shielding effect, but the electromagnetic shielding bodies made of the metals such as the copper plate and the aluminum plate have poor electromagnetic shielding effect on constant and extremely low frequency magnetic fields; the conductive rubber is also a commonly used electromagnetic shielding material, and is generally obtained by filling and distributing conductive filler in rubber by taking the rubber as a base material, wherein the conductive filler is generally made of a material with high conductivity and high magnetic conductivity, plays a role in absorbing and reflecting electromagnetic waves, and can not meet the shielding requirement of the electromagnetic waves in a wider frequency band. With the increase of electricity demand in China and the improvement of the voltage grade of power transmission and transformation equipment, secondary equipment such as intelligent monitoring, communication and control in a converter station and a transformer substation is continuously increased, so that the requirement of electromagnetic shielding between the equipment is gradually increased, and higher technical requirements are provided for a shielding body for electromagnetic shielding. At present, most of electromagnetic shielding bodies adopted between devices of transformer substations or converter stations are of single structures, and under the environment where various devices exist, the electromagnetic shielding bodies cannot achieve good electromagnetic shielding effects on electromagnetic waves in various frequency bands, so that the electromagnetic waves are often leaked, and electromagnetic interference is generated between the devices.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the electromagnetic shielding material among the prior art and adopting single structure can't shield multiple frequency channel electromagnetic wave, and the electromagnetic wave that causes reveals, leads to producing electromagnetic interference's defect between equipment to an electromagnetic shielding composite construction is provided.
An electromagnetic shielding composite structure, comprising in sequential stacked arrangement: wave-transparent layer, wave-absorbing layer, conductive rubber layer and metal shielding layer.
Further, a gap is formed between the wave-absorbing layer and the conductive rubber layer to form an air layer.
Further, the thickness of the air layer is 1 mm.
Furthermore, the wave-transmitting layer is made of any one of a glass fiber reinforced plastic plate, a quartz fiber plate or an epoxy resin plate.
Further, the thickness of the wave-transparent layer is 0.5-1 mm.
Furthermore, the wave absorbing layer is made of aramid paper honeycomb wicking wave material.
Furthermore, the thickness of the aramid fiber paper honeycomb core wave-absorbing material is 3-5mm, the honeycomb cells of the aramid fiber paper honeycomb core wave-absorbing material are hexagonal, rectangular, square or rhombic, and the side length of the honeycomb cells is 1-3 mm.
Furthermore, the conductive rubber layer is made of filled conductive silicone rubber, and the thickness of the conductive rubber layer is 2 mm.
Furthermore, the metal shielding layer is a copper plate or an aluminum plate with the thickness of 1 mm.
Furthermore, at least one side of the electromagnetic shielding composite structure is provided with a stainless steel clamping groove, and the edges of the wave-transmitting layer, the wave-absorbing layer, the conductive rubber layer and the metal shielding layer are embedded into the stainless steel clamping groove.
The utility model discloses technical scheme has following advantage:
1. the utility model provides an electromagnetic shielding composite construction, including range upon range of setting gradually: wave-transparent layer, the absorbing layer, conductive rubber layer and metal shielding layer, wherein, wave-transparent layer plays the guard action to absorbing layer, wave-transparent layer makes the electromagnetic wave can see through and by absorbing layer multiple scattering and absorption, increase the eddy current loss, free damping electromagnetic shield structure is constituteed to conductive rubber layer and metal shielding layer, shield the reflection to the electromagnetic wave, with the absorption of further increase absorbing layer, and conductive rubber layer and metal shielding layer combination can realize effectual electromagnetic shield to the electromagnetic wave in the broad frequency channel, above each layer mutually supports and reaches the multi-level effective shielding of electromagnetic wave, prevent the electromagnetic wave problem of revealing, it is more thorough to have reached electromagnetic wave shielding, and the wide frequency channel scope all has the effect of good electromagnetic shielding performance, it is safer to use.
2. The utility model provides an electromagnetic shield composite construction, further reserve the clearance in order to form the air bed between absorbing layer and conductive rubber layer, the air bed has certain electromagnetic wave decay and cushioning effect, further increases the inside eddy current loss of electromagnetic shield structure, and electromagnetic shield effect is more excellent.
3. The utility model provides an electromagnetic shielding composite construction, at least one side of electromagnetic shielding composite construction is provided with the stainless steel draw-in groove, and in the edge embedding stainless steel draw-in groove of ripples layer, absorbing layer, conductive rubber layer and metallic shield layer, has realized the connection between each layer, makes it become a whole, and the fixed mode of stainless steel draw-in groove has the advantage that can dismantle, be convenient for change each layer material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic perspective view of an electromagnetic shielding composite structure provided by the present invention;
fig. 2 is a schematic view of the connection structure of the electromagnetic shielding composite structure provided by the present invention.
Reference numerals:
1-a wave-transparent layer; 2-wave absorbing layer; 3-an air layer; 4-a conductive rubber layer; 5-a tie layer; 6-a metal shielding layer; 7-stainless steel clamping groove; 8-fastening piece.
Detailed Description
The technical solution of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "middle", "upper", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the utility model provides an electromagnetic shielding composite structure, it is including range upon range of setting gradually: the wave-transmitting layer 1, the wave-absorbing layer 2, the conductive rubber layer 4 and the metal shielding layer 6.
The utility model provides an electromagnetic shielding composite construction, including range upon range of setting gradually: wave-transparent layer 1, wave-absorbing layer 2, conductive rubber layer 4 and metal shielding layer 6, wherein, wave-transparent layer 1 plays the guard action to wave-absorbing layer 2, wave-transparent layer 1 makes the electromagnetic wave can see through and by wave-absorbing layer 2 scattering and absorption, increase the eddy current loss, free damping electromagnetic shield structure is constituteed to conductive rubber layer 4 and metal shielding layer 6, carry out shielding reflection many times to the electromagnetic wave, in order to further increase wave-absorbing layer 2's absorption, and conductive rubber layer 4 and metal shielding layer 6 make up and to realize effectual electromagnetic shield to the electromagnetic wave in the broad frequency channel scope, above each layer mutually supports and reaches the multi-level effective shielding of electromagnetic wave, prevent the electromagnetic wave problem of revealing, it is more thorough to have reached electromagnetic wave shielding, and the wide frequency channel scope all has good electromagnetic shielding performance's effect, it is safer to use.
The wave-transparent layer 1 has a wave-transparent function, on one hand, the wave-absorbing layer in the wave-transparent layer can be well protected, and on the other hand, the wave-transparent layer has an impedance matching function, so that electromagnetic waves can pass through the wave-transparent layer 1 without scattering and then enter the wave-absorbing layer 2. The wave-transparent layer 1 is made of the existing materials: the thickness of the wave-transmitting layer 1 is preferably 0.5 to 1mm, for example, a glass fiber plate, a quartz fiber plate, or an epoxy resin plate.
The wave-absorbing layer 2 has a wave-absorbing effect, and the electromagnetic waves penetrate through the wave-transmitting layer 1 and then generate magnetic hysteresis loss and eddy current loss in the wave-absorbing layer 2 to absorb and attenuate the electromagnetic waves. The wave-absorbing layer 2 is made of the following materials: aramid paper honeycomb wicking wave material. The aramid fiber paper honeycomb wicking wave material is an aramid fiber paper honeycomb core impregnated with a wave absorbing agent, belongs to the existing material, the wave absorbing layer 2 is preferably the aramid fiber paper honeycomb core impregnated with ferrite or a carbon-based wave absorbing agent, and is provided with regularly arranged honeycomb cells, incident electromagnetic waves are scattered and absorbed in the honeycomb cells for multiple times, the electromagnetic wave energy can be attenuated to the maximum extent, preferably, the thickness of the aramid fiber paper honeycomb core is 3-5mm, the honeycomb cells of the aramid fiber paper honeycomb core are hexagonal, rectangular, square or rhombic, and the side length of the honeycomb cells is 1-3 mm.
The conductive rubber layer 4 has the functions of absorbing and reflecting electromagnetic waves. The conductive rubber layer 4 is made of the existing conductive rubber material, namely rubber is used as a base material, and conductive fillers are filled and distributed in the rubber. The conductive filler with high conductivity and high magnetic conductivity forms a conductive network in the rubber, on one hand, eddy current is generated in the conductive rubber layer 4 to absorb part of electromagnetic waves, and on the other hand, the conductive filler has a reflection effect on the electromagnetic waves, so that the wave absorbing effect of the wave absorbing layer 2 is further enhanced. The conductive rubber layer 4 is preferably filled conductive silicone rubber, more preferably silver-plated hydroxyl nickel powder or silver-plated hydroxyl iron powder filled conductive silicone rubber, and the thickness of the conductive rubber layer 4 is preferably 2 mm. The conductive filler in the conductive rubber layer 4 has high conductivity and high magnetic conductivity, so that the electromagnetic shielding device is suitable for electromagnetic shielding of electromagnetic waves in a wide frequency range.
The metal shielding layer 6 has the function of reflecting electromagnetic waves, a small amount of electromagnetic waves penetrating through the conductive rubber layer 4 are reflected on the interface of the metal shielding layer 6, and the wave absorbing effect of the wave absorbing layer 2 and the conductive rubber layer 4 is further improved. The metallic shielding layer 6 is preferably a thin metal plate having high electrical conductivity, such as a copper plate or an aluminum plate having a thickness of 1 mm. The metal shielding layer 6 has a good effect of shielding high-frequency electromagnetic waves, but has a weak effect of shielding low-frequency electromagnetic waves, so that the conductive rubber layer 4 and the metal shielding layer 6 form a free damping electromagnetic shielding structure to shield and reflect electromagnetic waves, thereby realizing effective electromagnetic shielding on the electromagnetic waves in a wide frequency band range. Preferably, the conductive rubber layer 4 is connected to the metal shielding layer 6 by an adhesive layer 5, and the adhesive layer 5 may be an epoxy adhesive SW or a polyurethane adhesive TAR.
As a further improvement, as shown in figure 1, a gap is formed between the wave-absorbing layer 2 and the conductive rubber layer 4 to form an air layer 3. Preferably, the thickness of the air layer 3 is 1 mm.
The utility model provides an electromagnetic shield composite construction, further reserve the clearance in order to form the air bed between absorbing layer and conductive rubber layer, the air bed has certain electromagnetic wave decay and cushioning effect, further increases the inside eddy current loss of electromagnetic shield structure, and electromagnetic shield effect is more excellent.
As a further improvement, as shown in fig. 2, at least one side of the electromagnetic shielding composite structure is provided with a stainless steel slot 7, and edges of the wave-transparent layer 1, the wave-absorbing layer 2, the conductive rubber layer 4 and the metal shielding layer 6 are embedded into the stainless steel slot to fix the layers. In order to achieve a better fixing effect, the stainless steel clamping groove 7 is connected with the electromagnetic shielding composite structure through a fastener 8. Specifically, the edges of the wave-transparent layer 1, the wave-absorbing layer 2, the conductive rubber layer 4, the bonding layer 5 and the metal shielding layer 6 are embedded into the stainless steel slot 7 and fixed in the stainless steel slot 7 through the fastener 8, wherein the fastener 8 is a component for connecting and fastening the stainless steel slot, the wave-transparent layer 1 and the metal shielding layer 6, and can be, for example, a stainless steel screw or the like. Besides the conventional connection method, other conventional connection methods such as bonding and the like are also within the protection scope of the present invention.
The utility model provides an electromagnetic shield composite construction, the edge embedding stainless steel draw-in groove 7 of ripples layer 1, absorbing layer 2, conductive rubber layer 4, tie coat 5, metallic shield 6 is fixed in stainless steel draw-in groove 7 through fastener 8 in, has realized the connection between each layer, makes it become a whole, and stainless steel draw-in groove 7 and fastener 8's fixed mode has the advantage that can dismantle, be convenient for change each layer material.
It should be noted that can will according to actual need the utility model provides an electromagnetic shield composite construction will make the electromagnetic shield product that has different shapes, size, like electromagnetic shield board, electromagnetic shield storehouse etc. during specific application, wave-transparent layer 1 is located the one side that is close to the electromagnetic wave generating source, and metal shielding layer 6 is located the one side of keeping away from the electromagnetic wave generating source. The utility model provides an electromagnetic shield composite construction range of application is extensive, for example can be used for transformer substation's secondary equipment shielding shell, shield cover etc..
The working principle of the electromagnetic wave shielding composite structure provided by the embodiment is as follows: electromagnetic waves penetrate through the wave-transmitting layer 1 without scattering and then enter the wave-absorbing layer 2, the electromagnetic waves are scattered, absorbed and attenuated for multiple times by the wave-absorbing layer 2, the unabsorbed electromagnetic waves are further attenuated and buffered in the air layer 3, the electromagnetic waves are further absorbed in the conductive rubber layer 4 and reflected on the interface of the conductive rubber layer 4, the electromagnetic waves are reflected on the interface of the metal shielding layer 6, the electromagnetic waves enter the wave-absorbing layer 2 after being buffered and attenuated by the air layer 3 again after being reflected, the leakage of the electromagnetic waves is reduced through the multi-level absorption and reflection of the electromagnetic waves, a good electromagnetic shielding effect can be achieved on the electromagnetic waves in multiple frequency bands, and the electromagnetic interference generated between devices is avoided.
As an preferred embodiment of the utility model, an electromagnetic wave shielding composite construction, wave-transparent glass steel plate (thickness 0.5mm) has set gradually, aramid fiber paper honeycomb core (thickness 4mm, the shape of honeycomb cell is the hexagon, the length of side of honeycomb cell is 2mm), silver-plated hydroxyl nickel powder filled type electrically conductive silicone rubber (thickness 2mm), copper (thickness 1mm), wherein, the tie coat that forms through epoxy adhesive SW between silver-plated hydroxyl nickel powder filled type electrically conductive silicone rubber and the copper links to each other, and leave the clearance between aramid fiber paper honeycomb core and the silver-plated hydroxyl nickel powder filled type electrically conductive silicone rubber, form air bed (thickness 1mm), wave-transparent glass steel plate, aramid fiber paper honeycomb core, silver-plated hydroxyl nickel powder filled type electrically conductive silicone rubber, the edge embedding stainless steel draw-in groove of copper and through stainless steel screw fixation in the stainless steel draw-in groove. The electromagnetic wave shielding composite structure provided by the preferred embodiment has excellent electromagnetic shielding effectiveness in a frequency band of 10kHz-18 GHz.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. An electromagnetic shielding composite structure, its characterized in that, it includes range upon range of setting in proper order: the wave-transmitting layer (1), the wave-absorbing layer (2), the conductive rubber layer (4) and the metal shielding layer (6).
2. Electromagnetically shielding composite structure according to claim 1, characterized in that there is a gap between said wave-absorbing layer (2) and said conductive rubber layer (4) forming an air layer (3).
3. Electromagnetically shielding composite structure according to claim 2, characterized in that the thickness of said air layer (3) is 1 mm.
4. An electromagnetically shielding composite structure as claimed in any one of claims 1 to 3, wherein said wave-transmitting layer (1) is made of any one of a glass fiber reinforced plastic plate, a quartz fiber plate and an epoxy resin plate.
5. Electromagnetically shielding composite structure according to claim 4, characterized in that said wave-transparent layer (1) has a thickness of 0.5-1 mm.
6. The electromagnetic shielding composite structure as claimed in any one of claims 1 to 3, wherein the wave-absorbing layer (2) is made of aramid paper honeycomb wicking wave material.
7. The electromagnetic shielding composite structure of claim 6, wherein the aramid fiber paper honeycomb core wave-absorbing material has a thickness of 3-5mm, the aramid fiber paper honeycomb core wave-absorbing material has honeycomb cells in a hexagonal, rectangular, square or rhombic shape, and the side length of the honeycomb cells is 1-3 mm.
8. An electromagnetically shielding composite structure as claimed in any one of claims 1 to 3, wherein said electrically conductive rubber layer (4) is a filled electrically conductive silicone rubber, and said electrically conductive rubber layer (4) has a thickness of 2 mm.
9. An electromagnetically shielding composite structure as claimed in any one of claims 1 to 3, wherein said metallic shielding layer (6) is made of copper or aluminum plate having a thickness of 1 mm.
10. The electromagnetically shielding composite structure as claimed in any one of claims 1 to 3, wherein at least one side of the electromagnetically shielding composite structure is provided with a stainless steel notch (7), and edges of the wave-transmitting layer (1), the wave-absorbing layer (2), the conductive rubber layer (4) and the metal shielding layer (6) are embedded in the stainless steel notch (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921805163.1U CN210641258U (en) | 2019-10-24 | 2019-10-24 | Electromagnetic shielding composite structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921805163.1U CN210641258U (en) | 2019-10-24 | 2019-10-24 | Electromagnetic shielding composite structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210641258U true CN210641258U (en) | 2020-05-29 |
Family
ID=70798730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921805163.1U Active CN210641258U (en) | 2019-10-24 | 2019-10-24 | Electromagnetic shielding composite structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210641258U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115966916A (en) * | 2022-12-30 | 2023-04-14 | 浙江盛发纺织印染有限公司 | Radar wave-absorbing material and production process thereof |
-
2019
- 2019-10-24 CN CN201921805163.1U patent/CN210641258U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115966916A (en) * | 2022-12-30 | 2023-04-14 | 浙江盛发纺织印染有限公司 | Radar wave-absorbing material and production process thereof |
| CN115966916B (en) * | 2022-12-30 | 2023-08-11 | 浙江盛发纺织印染有限公司 | Radar wave-absorbing material and production process thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102359198B1 (en) | noise suppression assembly | |
| CN210641258U (en) | Electromagnetic shielding composite structure | |
| CN101384159A (en) | Electromagnetic compatible wood based composite material with shielding cloth covered on surface and preparation thereof | |
| US20220021246A1 (en) | Shielding film, coil assembly, and wireless charging device | |
| CN102711423A (en) | Conductive foam capable of absorbing waves | |
| CN101340807B (en) | Electromagnetic compatible wood based composite material for engineering and method preparing the same | |
| CN107535079B (en) | Electromagnetic wave blocking device having electromagnetic wave shielding and absorbing properties and method for manufacturing the same | |
| CN102724857B (en) | Rubber-ferrite structure | |
| CN203095967U (en) | Adhering film applied to electronic products | |
| CN211352977U (en) | Wave absorbing plate for shielding electromagnetic interference | |
| CN218337024U (en) | Can realize inhaling anti-interference shielding film of ripples | |
| KR100675514B1 (en) | Electromagnetic wave shield material | |
| CN211210360U (en) | Heat-insulation wave-absorbing material | |
| CN108728005B (en) | High heat conduction type wave-absorbing film | |
| CN204947095U (en) | A kind of absorbing material | |
| CN117222175A (en) | Insulating waveguide heat absorption gasket and preparation method thereof | |
| CN211630732U (en) | Composite wave-absorbing shielding material | |
| CN212232013U (en) | Broadband structure type high-temperature-resistant wave-absorbing material | |
| CN210840545U (en) | Wave-absorbing shielding film with heat dissipation and conduction functions | |
| CN209749047U (en) | Broadband structure type high-temperature-resistant wave-absorbing material | |
| CN118160423A (en) | Electromagnetic wave and magnetic field absorption shielding sheet and electronic equipment comprising same | |
| CN203011444U (en) | High-frequency electromagnetic interference preventing device of electromagnetic flowmeter | |
| CN104754927A (en) | Electromagnetic field shielding case | |
| CN109219335B (en) | Broadband wave absorbing plate and manufacturing method thereof | |
| CN209897546U (en) | High heat conduction electromagnetic shield structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |