CN214768774U - Ingot casting mold device for cold roll electroslag remelting and cold roll production system - Google Patents
Ingot casting mold device for cold roll electroslag remelting and cold roll production system Download PDFInfo
- Publication number
- CN214768774U CN214768774U CN202120619469.9U CN202120619469U CN214768774U CN 214768774 U CN214768774 U CN 214768774U CN 202120619469 U CN202120619469 U CN 202120619469U CN 214768774 U CN214768774 U CN 214768774U
- Authority
- CN
- China
- Prior art keywords
- cold roll
- iron core
- electroslag remelting
- ingot
- electromagnetic stirrer
- 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.)
- Expired - Fee Related
Links
- 238000005266 casting Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 31
- 238000009434 installation Methods 0.000 claims description 12
- 238000007711 solidification Methods 0.000 abstract description 3
- 230000008023 solidification Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000003756 stirring Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical group [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005426 magnetic field effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Images
Landscapes
- Continuous Casting (AREA)
Abstract
The utility model discloses a cast ingot mould device and cold roll production system for cold roll electroslag remelting, cast ingot mould device include cast ingot mould and electromagnetic stirrer device, and the cast ingot mould is used for splendid attire molten steel, and electromagnetic stirrer device includes shell and electromagnetic stirrer subassembly, and the electromagnetic stirrer subassembly is located in the inner chamber of shell, is equipped with the through-hole that link up along its axial in the shell, and cast ingot mould places in the through-hole. The electromagnetic stirrer device is sleeved on the outer periphery of the ingot casting mold, so that the purposes of eliminating macrosegregation and shrinkage cavity of the ingot casting, improving the uniformity of a solidification structure of the ingot casting and the like are achieved.
Description
Technical Field
The utility model relates to the field of metallurgical technology, especially, relate to a ingot mould device and cold roll production system for cold roll electroslag remelting.
Background
At present, the production process of the cold roll comprises the following steps: raw material → EBT primary smelting → LF refining → vacuum degassing → casting molding → electroslag remelting → forging → annealing → rough machining → tempering (quenching and high-temperature tempering) → semi-finishing → flaw detection → low-temperature tempering → finishing → hardness, ultrasonic and metallographic test → packaging and delivery, from which it can be seen that electroslag remelting plays a decisive role in the structure and performance of the cold roll. Although the service performance and the service life of the electroslag remelting ingot are greatly improved compared with those of steel without electroslag remelting, the problems of macrosegregation, poor uniformity of solidification structure and the like of the conventional electroslag remelting ingot can also occur along with the increase of the diameter of the ingot.
The defects of macro segregation, shrinkage cavity and the like of an electroslag remelting ingot can be improved through electromagnetic vibration, in the prior art, an electromagnetic stirrer is usually arranged around a water-cooled crystallizer, so that molten metal generates vibration to form an electromagnetic stirring effect, the aims of homogenizing the molten metal and reducing segregation are fulfilled, but in practical application, difficulties such as electroslag furnace transformation, control system transformation, relevant process transformation and the like are faced, the popularization and the application are difficult, and most of research is still in a laboratory stage at present.
The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.
SUMMERY OF THE UTILITY MODEL
To the problem pointed out in the background art, the utility model provides a cast ingot mould device and cold roll production system for cold roll electroslag remelting sets up electromagnetic stirrer device through the cover in cast ingot mould periphery, reaches elimination cast ingot macrosegregation and shrinkage cavity, improves purposes such as cast ingot solidification structure homogeneity.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:
the utility model provides a ingot mould device for cold roll electroslag remelting, include:
an ingot mould for containing molten steel;
the electromagnetic stirrer device comprises a shell and an electromagnetic stirrer assembly, wherein the electromagnetic stirrer assembly is arranged in an inner cavity of the shell, a through hole is formed in the shell along the axial direction of the shell, and the ingot casting mold is placed in the through hole.
In some embodiments of the present application, the electromagnetic stirrer assembly comprises a plurality of iron cores having coils wound thereon, the coils being energized by a three-phase power supply;
the shell includes urceolus and power installation department, power installation department is fixed to be located the outside of urceolus, the inside of urceolus is formed with the cavity, the urceolus encloses into the through-hole, the cavity with power installation department's inner chamber intercommunication, iron core portion locates in the cavity, it is a plurality of iron core portion follows the circumferencial direction of urceolus distributes, three phase current locates in power installation department's the inner chamber.
In some embodiments of the present application, the core portion is a core ring structure, and the coil is wound along a circumferential direction of the core ring.
In some embodiments of the present application, two adjacent core rings have an overlapping portion.
In some embodiments of the present application, three iron core rings form one iron core ring group, two iron core ring groups are disposed in the cavity, and the two iron core ring groups are symmetrically distributed with respect to the outer cylinder.
In some embodiments of the present application, the core ring has a height dimension greater than a width dimension.
In some embodiments of the present application, the core ring has an elliptical shape.
In some embodiments of the present application, the core portion is welded to the outer shell.
In some embodiments of the present application, two brackets are arranged on the outer barrel, the two brackets are respectively arranged on two sides of the power installation portion, and bolt holes are arranged on the brackets.
The utility model also provides a cold roll production system, include as above the ingot mould device that the cold roll electroslag remelted.
Compared with the prior art, the utility model discloses an advantage is with positive effect:
when the ingot casting mold device disclosed by the application is used, the ingot casting mold is placed in the through hole of the electromagnetic stirring device, molten steel is injected into the ingot casting mold, the molten steel is cooled and solidified in the air to form a consumable electrode, the electromagnetic stirrer component surrounds the ingot casting mold, a fixed magnetic field is applied to the ingot casting mold, the internal heat transfer of a metal molten pool is facilitated to be enhanced, the temperature gradient of the molten pool is reduced, the macrosegregation of the ingot casting is eliminated, the nucleation and growth of isometric crystals are facilitated, crystal grains are refined, the physical and chemical uniformity of the molten structure is higher, the performance is better, and the purposes of eliminating the macrosegregation and shrinkage cavity of the ingot casting, improving the uniformity of the solidified structure of the ingot casting and the like are achieved.
The electromagnetic stirrer device and the ingot mould are mutually independent, the electromagnetic stirrer device is arranged on the periphery of the ingot mould, and the ingot mould is placed in the through hole of the electromagnetic stirrer device when in use; after the use, the ingot mould is taken out, so that the replacement of the ingot mould is convenient, and the use convenience is improved.
By applying the ingot casting mold device, the quality of the consumable electrode can be improved, the existing electroslag furnace and related processes do not need to be redesigned, and the process improvement cost is greatly reduced.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when read in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or 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 inventive labor.
Fig. 1 is a schematic structural view of an electromagnetic stirrer arrangement according to an embodiment;
FIG. 2 is a partial cross-sectional view of an ingot mold apparatus for cold roll electroslag remelting according to an embodiment;
fig. 3 is a schematic structural view of the ingot mold device for cold roll electroslag remelting according to the embodiment, with a housing omitted.
Reference numerals:
100-ingot casting mold;
200-electromagnetic stirrer arrangement, 210-housing, 211-outer cylinder, 212-power supply mount, 213-cavity, 214-through hole, 215-bracket, 216-bolt hole, 220-electromagnetic stirrer assembly, 221-core ring, 222-coil, 223-three-phase power supply, 224-core ring set.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 application can be understood in a specific case by those of ordinary skill in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Example one
The embodiment discloses an ingot casting mold device for cold roll electroslag remelting, which is used for an electroslag remelting process in a cold roll production process.
Referring to fig. 1 to 3, the ingot mold apparatus includes an ingot mold 100 and an electromagnetic stirrer apparatus 200.
Ingot mold 100 is a conventional ladle vessel for holding molten steel.
The electromagnetic stirrer device 200 is the main point of the present application for structural improvement, and can be fitted around the ingot mold 100.
Specifically, the electromagnetic stirrer apparatus 200 includes a housing 210 and an electromagnetic stirrer assembly 220, the electromagnetic stirrer assembly 220 being disposed in an inner cavity of the housing 210, and a through hole 214 being provided in the housing 210 along an axial direction thereof.
When the device is used, the ingot casting mold 100 is placed in the through hole 214, molten steel is injected into the ingot casting mold 100, the molten steel is cooled and solidified in the air to form a consumable electrode, the electromagnetic stirrer assembly 220 equivalently surrounds the ingot casting mold 100, a fixed magnetic field is applied to the ingot casting mold 100, the internal heat transfer of a metal molten pool is facilitated to be enhanced, the temperature gradient of the molten pool is reduced, the macrosegregation of an ingot is eliminated, the nucleation and growth of equiaxial crystals are facilitated, crystal grains are refined, the physical and chemical uniformity of a molten structure is higher, the performance is better, and the purposes of eliminating the macrosegregation and shrinkage cavity of the ingot, improving the uniformity of a solidified structure of the ingot and the like are achieved.
In this embodiment, the electromagnetic stirrer device 200 is independent from the ingot mold 100, the electromagnetic stirrer device 200 is mounted on the outer periphery of the ingot mold 100, and the ingot mold 100 is placed in the through hole 214 of the electromagnetic stirrer device 200 when in use; after the use, the ingot mould 100 is taken out, so that the ingot mould 100 is convenient to replace, and the use convenience is improved.
By applying the ingot casting mold device in the embodiment, the quality of the consumable electrode can be improved, the existing electroslag furnace and related processes do not need to be redesigned, and the process improvement cost is greatly reduced.
In some embodiments of the present application, the electromagnetic stirrer assembly 220 comprises a plurality of iron cores having coils 222 wound thereon, the coils 222 being energized by a three-phase power supply 223.
The housing 210 includes an outer cylinder 211 and a power supply mounting portion 212, the power supply mounting portion 212 is fixedly disposed outside the outer cylinder 211, a cavity 213 is formed inside the outer cylinder 211, a through hole 214 is defined by the outer cylinder 211, and the cavity 213 is communicated with an inner cavity of the power supply mounting portion 212.
A plurality of iron core portions are provided in the cavity 213, and are distributed along a circumferential direction of the outer cylinder 211 to provide a more uniform electromagnetic stirring effect to the ingot mold 100, and a three-phase power supply 223 is provided in an inner cavity of the power supply mounting portion 212.
As for the specific structure of the core portion, in the present embodiment, the core portion is a core ring structure, and the coil 222 is wound along the circumferential direction of the core ring 221.
In the prior art, when the iron core adopts the iron core block structure, the thickness of the iron core is large, and a large thickness space is required during installation, but the thickness of the iron core part is reduced by the iron core ring 221 in the embodiment, so that the outer shell 210 (particularly the outer cylinder 211) can meet the installation requirement of the iron core ring 221 without being too thick.
In addition, in the core block structure in the prior art, the generated heat is concentrated on the smaller core blocks, which is inconvenient for heat dissipation, and the heat generated by the core ring 221 in this embodiment has a larger distribution area, which is convenient for heat dissipation.
Preferably, the height dimension of the core ring 221 is larger than the width dimension, and the electromagnetic action area between the core ring 221 and the ingot mold 100 is further increased, which contributes to an improvement in the electromagnetic stirring effect.
The shape of the core ring 221 may be an ellipse or the like.
For the specific arrangement structure of the iron core portions, in this embodiment, two adjacent iron core rings 221 have overlapping portions, and the overlapping arrangement mode helps to further improve the magnetic field effect and the electromagnetic stirring effect.
In some embodiments of the present application, three core rings 221 form a core ring set 224, two core ring sets 224 are disposed in the cavity 213, and the two core ring sets 224 are symmetrically distributed with respect to the outer cylinder 211, so that the outer circumference of the ingot mold 100 is covered with the core rings 221, which helps to improve the uniformity of electromagnetic stirring.
Two core ring sets 224 may share a single three-phase power supply 223.
In some embodiments of the present application, the iron core portion is welded and fixed to the outer shell 210 (specifically, the outer cylinder 211), so that the structure is more reliable and stable, and the iron core portion is prevented from falling off.
In some embodiments of the present application, two brackets 215 are disposed on the outer cylinder 211, the two brackets 215 are disposed on two sides of the power supply mounting portion 212, bolt holes 216 are disposed on the brackets 215, and bolts are inserted into the bolt holes 216, so as to fix the outer cylinder 211, thereby improving the stability of the whole ingot mold device in use.
Example two
The embodiment discloses a cold roll production system, which comprises the cold roll electroslag remelting ingot mold device disclosed in the embodiment.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a ingot mould device for cold roll electroslag remelting which characterized in that includes:
an ingot mould for containing molten steel;
the electromagnetic stirrer device comprises a shell and an electromagnetic stirrer assembly, wherein the electromagnetic stirrer assembly is arranged in an inner cavity of the shell, a through hole is formed in the shell along the axial direction of the shell, and the ingot casting mold is placed in the through hole.
2. The ingot mold device for cold roll electroslag remelting according to claim 1,
the electromagnetic stirrer assembly comprises a plurality of iron cores on which coils are wound, the coils being switched on by a three-phase power supply;
the shell includes urceolus and power installation department, power installation department is fixed to be located the outside of urceolus, the inside of urceolus is formed with the cavity, the urceolus encloses into the through-hole, the cavity with power installation department's inner chamber intercommunication, iron core portion locates in the cavity, it is a plurality of iron core portion follows the circumferencial direction of urceolus distributes, three phase current locates in power installation department's the inner chamber.
3. The ingot mold device for cold roll electroslag remelting according to claim 2,
the iron core part is an iron core ring structure, and the coil is wound along the circumferential direction of the iron core ring.
4. The ingot mold device for cold roll electroslag remelting according to claim 3,
two adjacent iron core rings have an overlapping portion.
5. The ingot mold device for cold roll electroslag remelting according to claim 4,
the three iron core rings form an iron core ring group, two iron core ring groups are arranged in the cavity, and the two iron core ring groups are symmetrically distributed relative to the outer barrel.
6. The ingot mold device for cold roll electroslag remelting according to claim 3,
the height dimension of the iron core ring is larger than the width dimension.
7. The ingot mold device for cold roll electroslag remelting according to claim 6,
the iron core ring is oval.
8. Ingot mold device for cold roll electroslag remelting according to any one of claims 2 to 7,
the core portion is welded to the shell.
9. Ingot mold device for cold roll electroslag remelting according to any one of claims 2 to 7,
the outer barrel is provided with two supports which are respectively arranged on two sides of the power supply installation part, and the supports are provided with bolt holes.
10. A cold roll production system, comprising an ingot mold apparatus for electroslag remelting of a cold roll according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120619469.9U CN214768774U (en) | 2021-03-26 | 2021-03-26 | Ingot casting mold device for cold roll electroslag remelting and cold roll production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120619469.9U CN214768774U (en) | 2021-03-26 | 2021-03-26 | Ingot casting mold device for cold roll electroslag remelting and cold roll production system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214768774U true CN214768774U (en) | 2021-11-19 |
Family
ID=78667631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120619469.9U Expired - Fee Related CN214768774U (en) | 2021-03-26 | 2021-03-26 | Ingot casting mold device for cold roll electroslag remelting and cold roll production system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214768774U (en) |
-
2021
- 2021-03-26 CN CN202120619469.9U patent/CN214768774U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11732337B2 (en) | Method for producing high nitrogen steel by duplex melting process of pressurized ladle refining and pressurized electroslag remelting | |
| CN105734369B (en) | The heat top casting technique of φ 784mm 7xxx 7 series extra super duralumin alloy poles | |
| WO2021036225A1 (en) | Smelting process for high-niobium high-temperature alloy large-size cast ingot, and high-niobium high-temperature alloy large-size cast ingot | |
| CN101624671B (en) | Large-diameter 7005 aluminum alloy round ingot and preparation method thereof | |
| CN102430732B (en) | Device and process for internal and external cooling continuous casting of magnesium alloy and aluminum alloy ingot blanks | |
| KR20140010408A (en) | Melting furnace for smelting metal | |
| CN1314501C (en) | Electromagnetic semicontinuous casting method of aluminium alloy pipe material and its casting device | |
| CN105401059A (en) | Manufacturing technology and device for improved forged steel roller neck high nickel chrome molybdenum alloy cast composite roller | |
| CN109986039B (en) | Launder melt electromagnetic treatment device and launder melt electromagnetic treatment process | |
| CN214768774U (en) | Ingot casting mold device for cold roll electroslag remelting and cold roll production system | |
| CN204474735U (en) | A kind of anti-sparking crystallizer | |
| US5193607A (en) | Method for precision casting of titanium or titanium alloy | |
| CN115558814B (en) | Cold crucible induction smelting method for multielement, high-activity and refractory high-entropy alloy | |
| JPH05280871A (en) | Water-cooled divided copper crucible for induction melting service | |
| CN116004993A (en) | Method for improving solidification quality of electroslag remelting cast ingot through dynamic zone cooling | |
| CN102517476B (en) | High strength aluminum alloy capable of reducing porosity and dispersed shrinkage and preparation method thereof | |
| CN107034402B (en) | The big ingot blank electromagnetism semicontinuous casting technique of the strong high temperature resistant magnesium alloy of superelevation | |
| CN214601809U (en) | Serial-connection type aluminum alloy electromagnetic energy grain refining launder device | |
| CN210908017U (en) | Electromagnetic multi-cyclone stirring casting device | |
| SU341323A1 (en) | Method of electroslag casting of ingots | |
| CN102398005B (en) | Built-in type electromagnetic stirring device and application method thereof | |
| CN112808957B (en) | Casting crystallizer of high-alloying alloy cast rod and preparation method thereof | |
| EP0457502B1 (en) | Method and apparatus for precision casting | |
| KR100700360B1 (en) | The supplying apparatus of semi-solid slurry with electromagnetic stirring | |
| CN220005941U (en) | Heating and electromagnetic stirring solidification device of vacuum furnace die |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211119 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |