CN203440400U - Amorphous base metal smelting device - Google Patents
Amorphous base metal smelting device Download PDFInfo
- Publication number
- CN203440400U CN203440400U CN201320536592.XU CN201320536592U CN203440400U CN 203440400 U CN203440400 U CN 203440400U CN 201320536592 U CN201320536592 U CN 201320536592U CN 203440400 U CN203440400 U CN 203440400U
- Authority
- CN
- China
- Prior art keywords
- vacuum
- tank
- cooling
- ladle
- preliminary
- 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
Images
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The utility model belongs to the technical field of smelting, and particularly relates to an amorphous base metal smelting device. The device adopts two structures, wherein one structure is that a vacuum tank, a forvacuum cooling dust removal tank, a mechanical pump and a water ring pump are sequentially connected through pipelines; the other structure is that a vacuum cap is arranged above a steel ladle; a seal tank body is defined by the steel ladle and the vacuum cap, and sequentially connected with the forvacuum cooling dust removal tank, the mechanical pump and the water ring pump; valves are respectively arranged on the connecting pipelines. Through the adoption of the amorphous base metal smelting device, the requirement on the vacuum degree can be met fast after the steel ladle is hung into the vacuum tank in forvacuum, and the temperature of burner gas is reduced through a water cooling system; meanwhile, the designed forvacuum cooling dust removal tank body structure realizes the dust removal effect of dusty gas, a dust remover is not arranged individually, so that the equipment investment and the occupied space are saved. A novel external refining device integrates the smoke treatment, the high-temperature gas cooling treatment, and the acceleration of the vacuum degassing process of molten steel. The device which is small in investment, small in occupied area, and simple and convenient to use is provided.
Description
Technical field
The utility model belongs to technical field of smelting, is specifically related to a kind of amorphous mother metal smelting equipment.
Background technology
The production of the amorphous metal band of iron-based, the material such as Ni-based, is generally divided into two technological processs:
1, first according to the material prescription melting of preparing burden, if 1K101 material formula composition is Fe78～80%; Si8～10%; B12～14%.1K107 composition is Fe70～75%; (Si, B) 20～25%; Cu0.5～2%; M1～5%.Press the metering of material composition content, order adds the alloys such as pure iron, ferrosilicon, ferro-boron, utilize the smelting of preparing burden of mid-frequency melting furnace or vacuum intermediate-frequency smelting furnace, by induction heating, melt body of heater interalloy material, and by the characteristic of induction heater, the metal liquid of melting is fully stirred, make full and uniformization of composition, pour at normal temperatures non-crystaline amorphous metal masterbatch steel ingot after reaching teeming temperature, this masterbatch is crystal as-cast structure.
2, amorphous masterbatch is added in the mid-frequency melting furnace of amorphous spray with machine and melt, after high temperature melting is clear, the teeming temperature suitable according to differing materials generally pours into nozzle bag at 1260 ℃～1360 ℃, make molten steel pass through the slit of nozzle and suitable roller mouth spacing, high-temp liquid is cooling fast by ultrafast cold copper roller, rate of cooling reach 106 ℃/more than s, the gauge control of band is at 20～40um, make this band under the operating mode of fast quenching, form the material structure of the unordered short range order of atomic arrangement long-range, form amorphous metal material.
In first technique, smelt in the production process of amorphous mother metal, to the major requirement of the mother metal material of producing, be: by the chemical composition of formula requirement material evenly, accurately.Non-metallic inclusion can not exceed standard, in every hundred square millimeters of visual fields: to be 1. mingled with above quantity be 0 to 5 μ m; 2. 5 μ m are mingled with quantity 2-3 below.Require the content of gas as far as possible low, general control is at H≤2ppm, O≤20ppm, N≤40ppm.By these control requirements to mother metal, in the time of can realizing the band of operation spray thereafter process metal liquid by nozzle slot, do not produce obstruction, minimizing is mingled with and gas micropore exists the impact on amorphous band toughness in strip, and the impact on band magnetic property.Such requirement makes conventional intermediate frequency (IF) smelting technique and equipment cannot meet the technical requirements of producing amorphous masterbatch, and the producer that make investment construction, has a mid-frequency melting furnace cannot produce qualified amorphous masterbatch.The producer that produces at present non-crystalline material all needs to invest vacuum melting equipment, and general domestic 3 tons of above vacuum melting equipment investment expenses need 300-800 ten thousand yuan every mostly.And adopt current VOD, VD mode to carry out vacuum-treat, need investment construction steam boiler, steam spraying type vacuum system, dust-removal system, cooling system, system complex is huge, and investment is large.
Therefore need to improve for above-mentioned equipment, design a kind of amorphous mother metal smelting equipment simple in structure.
Summary of the invention
For solving the problems of the technologies described above, the utility model provides a kind of amorphous mother metal smelting equipment simple in structure.
Amorphous mother metal smelting equipment of the present utility model is realized by following technical proposals:
Amorphous mother metal smelting equipment, this equipment comprises vacuum tank, has vacuum container cover with matching above vacuum tank;
Vacuum tank base is arranged at vacuum tank bottom, has argon gas to take in vacuum tank base, is also connected with vacuum meter on vacuum tank;
Vacuum tank is connected by pipeline with preliminary vacuum cooling and dedusting tank, on the pipeline between vacuum tank and preliminary vacuum cooling and dedusting tank, has vacuum breaker and valve;
There is water cooler preliminary vacuum cooling and dedusting tank inside, and discharge apparatus is arranged at the bottom of preliminary vacuum cooling and dedusting tank, on the sidewall of preliminary vacuum cooling and dedusting tank, has hand-hole, and preliminary vacuum cooling and dedusting tank is connected with air filter, mechanical pump, water-ring pump in turn by pipeline;
On pipeline between preliminary vacuum cooling and dedusting tank and air filter, there are vacuum meter and valve.
Between vacuum tank and vacuum container cover, there is sealing-ring.
The volume of preliminary vacuum cooling and dedusting tank is 3-6 times of vacuum tank volume.
As a kind of improvement of the present utility model, amorphous mother metal smelting equipment comprises ladle base, ladle vacuum cover, and ladle base below has argon gas to take over;
Ladle vacuum cover is also connected with rocker arm support and is installed on the elevating rocker arm on rocker arm support;
On ladle vacuum cover, be connected with vacuum meter;
Ladle vacuum cover is connected with preliminary vacuum cooling and dedusting tank by pipeline, on the pipeline between ladle vacuum cover and preliminary vacuum cooling and dedusting tank, has vacuum breaker and valve;
There is water cooler preliminary vacuum cooling and dedusting tank inside, and discharge apparatus is arranged at the bottom of preliminary vacuum cooling and dedusting tank; On the sidewall of preliminary vacuum cooling and dedusting tank, there is hand-hole; Preliminary vacuum cooling and dedusting tank is connected with mechanical pump and water-ring pump in turn by pipeline; On pipeline between preliminary vacuum cooling and dedusting tank and mechanical pump, there are vacuum meter and valve.
There is sealing-ring the below of ladle vacuum cover.
The beneficial effects of the utility model are, adopt the amorphous mother metal smelting equipment of said structure, in advance preliminary vacuum make ladle hang in can be fast after vacuum tank reach vacuum tightness requirement, can reduce by water-cooling system the temperature of furnace gas, the preliminary vacuum cooling and dedusting tank structure of design has been realized the dustproof function of dusty gas simultaneously, fly-ash separator need not be set separately, saved taking of equipment investment and space, this utility model is by dust treatment, high-temperature gas cooling is processed, improving molten steel Vacuum Degassing Process is integrated in one, provide a kind of investment little, take up an area few, use simple and direct equipment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of intermediate frequency furnace in embodiment 1 of the present utility model;
Fig. 2 is the structural representation of ladle in embodiment 1 of the present utility model;
Fig. 3 is embodiment 1 smelting equipment structural representation of the present utility model;
Fig. 4 is embodiment 2 smelting equipment structural representations of the present utility model;
In figure, 1-intermediate frequency furnace, 2-ladle, 3-vacuum tank, 4-vacuum container cover, 5-sealing-ring, 6-vacuum tank base, 7-vacuum breaker, 8-valve, 9-water cooler, 10-preliminary vacuum cooling and dedusting tank, 11-vacuum meter, 12-hand-hole, 13-discharge apparatus, 14-mechanical pump, 15-water-ring pump, 16-argon gas is taken over, 17-intake-outlet, 18-air filter, 19-rocker arm support, 20-ladle vacuum cover, 21-gas interface, 22-ladle base, 23-elevating rocker arm.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described, so that those skilled in the art understand the utility model.
Embodiment 1
Amorphous mother metal smelting equipment, this equipment comprises vacuum tank 3, there is vacuum container cover 4 with matching vacuum tank 3 tops;
Vacuum tank base 6 is arranged at vacuum tank 3 bottoms, has argon gas to take over 16 in described vacuum tank base 6, is also connected with vacuum meter 11 on vacuum tank 3; Gas interface 21 is arranged at the bottom of ladle 2, and gas interface 21 is taken over 16 with the argon gas in vacuum tank base 6 and is connected;
Vacuum tank 3 is connected by pipeline with preliminary vacuum cooling and dedusting tank 10, on the pipeline between described vacuum tank 3 and preliminary vacuum cooling and dedusting tank 10, has vacuum breaker 7 and valve 8;
There is water cooler 9 preliminary vacuum cooling and dedusting tank 10 inside, and intake-outlet 17 is arranged at the bottom of water cooler 9; Discharge apparatus 13 is arranged at the bottom of preliminary vacuum cooling and dedusting tank 10, on the sidewall of preliminary vacuum cooling and dedusting tank 10, has hand-hole 12, and preliminary vacuum cooling and dedusting tank 10 is connected with air filter 18, mechanical pump 14, water-ring pump 15 in turn by pipeline;
On pipeline between preliminary vacuum cooling and dedusting tank 10 and air filter 18, there are vacuum meter 11 and valve 8.
Between vacuum tank 3 and vacuum container cover 4, there is sealing-ring 5.
The volume of preliminary vacuum cooling and dedusting tank 10 is 4 times of left and right of 3 complementary space volumes of vacuum tank.
When adopting above-mentioned equipment to smelt, its concrete step is:
Take 1K107 as example, and batching, adopts intermediate frequency furnace 1 molten alloy masterbatch, and the molten temperature of resetting and adding of alloy stirs molten steel, and furnace temperature is lifted temperature to approximately 1600 ℃, and molten steel is added to (in ladle 2, resistance to material is through approximately 700 ℃ of roasting bags) in ladle 2, and ladle 2 is hung in vacuum tank 3.
When the molten clear preparation temperature raising of intermediate frequency furnace 1 molten steel, start preliminary vacuum system operation: close the valve 8 between vacuum tank 3 and preliminary vacuum cooling and dedusting tank 10 bodies simultaneously, open oil-sealed rotary pump unit mechanical pump 14 and water-ring pump 15, to preliminary vacuum cooling and dedusting tank 10 extracting vacuum, make preliminary vacuum cooling and dedusting tank 10 interior vacuum tightnesss be less than state, the pressurize of 67Pa in advance; Open water cooling system, makes in preliminary vacuum cooling and dedusting tank 10 water cooler 9 in refrigerating state.
After ladle 2 hangs in vacuum tank 3, connect bottom argon gas pipeline (pre-Argon can be carried out, then floating inclusion closes argon gas), cover vacuum container cover 4 and form air-tight state, valve 8 between unlatching control vacuum tank 3 and preliminary vacuum cooling and dedusting tank 10 on connecting tube is gradually open-minded, in vacuum tank 3 in gas flow preliminary vacuum cooling and dedusting tank 10, vacuum tightness in vacuum tank 3 is progressively improved, in ladle 2, molten steel is due to the reduction of outside dividing potential drop, the gas (H, O, N, CO) being originally dissolved in molten steel progressively rises and deviates from liquid level, and molten steel is in vacuum outgas state; Make in vacuum tank 3 vacuum tightness be less than and equal 67Pa state, keep pressure (can crackly open BOTTOM ARGON BLOWING auxiliary degassed, go to be mingled with).Vacuum unit mechanical pump 14 and water-ring pump 15 can continue to start or restart after two tank vacuum tightnesss reach balance secondary operation, until reach 67Pa pressurize, the degassed treatment time is about 25min.
After Fruit storage completes, close pipeline valve 8, open vacuum breaker 7, nitrogen vacuum breaker, at this moment preliminary vacuum cooling and dedusting tank 10 can continue to keep 67Pa vacuum state, the Fruit storage of next stove molten steel of standby, (can close the valve 8 between preliminary vacuum cooling and dedusting tank 10 and air filter 18, keep the vacuum tightness in preliminary vacuum cooling and dedusting tank 10, mechanical pump 14 standbies are shut down) follow-up processing just need not start to vacuumize from atmosphere pressure state, thereby significantly improved the effective rate of utilization of vacuum system, reduce running cost, improve vacuum degassing process efficiency.
Fruit storage process approximately needs 25min, and molten steel per minute under vacuum-treat state is lowered the temperature approximately 2.4 ℃, and vacuum-treat process is lowered the temperature approximately 60 ℃; Add and lift approximately 5 minutes non-cutting times, the overall process time is 30min, temperature drop is about 72 ℃, after processing, molten steel temperature can be controlled at 1300 ℃～1520 ℃,, there is the time remaining of abundant adjustment teeming temperature general ≤1300 ℃ of teeming temperature of 1K107 material molten steel through the molten steel temperature of this Fruit storage process.
After Fruit storage, molten steel can be protected cast, can carry out the casting techniques such as horizontal casting, and the ingot casting that completes amorphous masterbatch is produced.
In the present embodiment, intermediate frequency furnace 1 is identical with embodiment 1 with the structure of ladle 2;
Amorphous mother metal smelting equipment comprises ladle 2 bases, ladle 2 vacuum covers, and ladle base 22 belows have argon gas to take over 16; There is gas interface 21 below of ladle, and this gas interface 21 is taken over 16 with the argon gas of ladle base 22 belows and is connected;
Ladle 2 vacuum covers are also connected with rocker arm support 19 and are installed on the elevating rocker arm 23 on rocker arm support 19;
On ladle 2 vacuum covers, be connected with vacuum meter 11;
There is water cooler 9 preliminary vacuum cooling and dedusting tank 10 inside, and intake-outlet 17 is arranged at the bottom of water cooler 9; Discharge apparatus 13 is arranged at the bottom of preliminary vacuum cooling and dedusting tank 10; On the sidewall of preliminary vacuum cooling and dedusting tank 10, there is hand-hole 12; Preliminary vacuum cooling and dedusting tank 10 is connected with mechanical pump 14 and water-ring pump 15 in turn by pipeline; On described preliminary vacuum cooling and dedusting tank 10 and the pipeline between mechanical pump 14, there are vacuum meter 11 and valve 8.
There is sealing-ring 5 below of ladle 2 vacuum covers.
Press 1K101 formula metering batching, adopt intermediate frequency furnace 1 molten alloy masterbatch, the molten temperature of resetting and adding of alloy stirs molten steel, furnace temperature is increased to approximately 1560 ℃, molten steel is added to (in ladle 2, resistance to material is through approximately 700 ℃ of roasting bags) in vacuum ladle 2, the argon gas interface of connecting ladle 2 places, the mouth of a river, bottom, adopts the micro-Argon of flexible pipe, ladle 2 is winched on the vacuum ladle base 22 of setting.
In addition, in the molten clear preparation temperature raising of intermediate frequency furnace 1 molten steel, start preliminary vacuum system operation:
Close the valve 8 between vacuum tank 3 and preliminary vacuum cooling and dedusting tank 10 bodies, open oil-sealed rotary pump unit and be mechanical pump 14 and water-ring pump 15 in advance to preliminary vacuum cooling and dedusting tank 10 extracting vacuum, make preliminary vacuum cooling and dedusting tank 10 interior vacuum tightnesss be less than state, the pressurize of 67Pa; Open water cooling system, makes in preliminary vacuum cooling and dedusting tank 10 heat exchanger in refrigerating state.
After ladle 2 winches on ladle base 22, cover ladle vacuum cover 20, make ladle vacuum cover 20 and ladle 2 internal spaces form air-tight state, open and control the valve 8 on connecting tube between ladle vacuum cover 20 and preliminary vacuum cooling and dedusting tank 10, open-minded gradually, in gas flow preliminary vacuum cooling and dedusting tank 10 in ladle 2 metal bath surfaces and vacuum clad space, molten steel upper space vacuum tightness in ladle 2 is progressively improved, in ladle 2, molten steel is due to the reduction of outside dividing potential drop, originally be dissolved in the gas (H in molten steel, O, N, CO) progressively rise and deviate from liquid level, molten steel is in vacuum outgas state.Ladle 2 liquid level places are less than and equal 67Pa state, keep pressure (can control open BOTTOM ARGON BLOWING auxiliary degassed, go to be mingled with).
Vacuum unit mechanical pump 14 and water-ring pump 15 can continue to start or after ladle 2 and preliminary vacuum cooling and dedusting tank 10 vacuum tightnesss reach balance, restart secondary operation, until reach 67Pa pressurize, the degassed treatment time is about 30min.
The about 30min of Fruit storage process, molten steel approximately 2.5 ℃ of per minute temperature drops under vacuum-treat state, vacuum-treat process is lowered the temperature approximately 75 ℃; After processing, molten steel temperature can be controlled at 1300 ℃～1500 ℃, and 1K101 material solidification of molten steel temperature is generally at 1190 ℃, through the molten steel temperature of this Fruit storage process have abundant adjustment teeming temperature space.
After Fruit storage, molten steel can be protected cast, can carry out the casting techniques such as horizontal casting, and the ingot casting that completes amorphous masterbatch is produced.
Claims (5)
1. amorphous mother metal smelting equipment, is characterized in that, described equipment comprises vacuum tank, and there is vacuum container cover with matching described vacuum tank top;
Vacuum tank base is arranged at described vacuum tank bottom, has logical argon gas to take in described vacuum tank base, is also connected with vacuum meter on vacuum tank;
Described vacuum tank is connected by pipeline with preliminary vacuum cooling and dedusting tank, on the pipeline between described vacuum tank and preliminary vacuum cooling and dedusting tank, has vacuum breaker and valve;
There is water cooler described preliminary vacuum cooling and dedusting tank inside, discharge apparatus is arranged at the bottom of preliminary vacuum cooling and dedusting tank, on the sidewall of preliminary vacuum cooling and dedusting tank, have hand-hole, described preliminary vacuum cooling and dedusting tank is connected with air filter, mechanical pump, water-ring pump in turn by pipeline;
On described preliminary vacuum cooling and dedusting tank and the pipeline between air filter, there are vacuum meter and valve.
2. amorphous mother metal smelting equipment as claimed in claim 1, is characterized in that there is sealing-ring between described vacuum tank and vacuum container cover.
3. amorphous mother metal smelting equipment as claimed in claim 1, is characterized in that, the volume of described preliminary vacuum cooling and dedusting tank is 3-6 times of vacuum tank volume.
4. amorphous mother metal smelting equipment, is characterized in that, described equipment comprises Ladle Bottom seat, ladle vacuum cover, and described ladle base below has argon gas to take over;
Described ladle vacuum cover is also connected with rocker arm support and is installed on the elevating rocker arm on rocker arm support;
On described ladle vacuum cover, be connected with vacuum meter;
Described ladle vacuum cover is connected with preliminary vacuum cooling and dedusting tank by pipeline, on the pipeline between ladle vacuum cover and preliminary vacuum cooling and dedusting tank, has vacuum breaker and valve;
There is water cooler described preliminary vacuum cooling and dedusting tank inside, and discharge apparatus is arranged at the bottom of described preliminary vacuum cooling and dedusting tank; On the sidewall of preliminary vacuum cooling and dedusting tank, there is hand-hole; Described preliminary vacuum cooling and dedusting tank is connected with mechanical pump and water-ring pump in turn by pipeline; On described preliminary vacuum cooling and dedusting tank and the pipeline between mechanical pump, there are vacuum meter and valve.
5. amorphous mother metal smelting equipment as claimed in claim 4, is characterized in that, there is sealing-ring the below of described ladle vacuum cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320536592.XU CN203440400U (en) | 2013-08-31 | 2013-08-31 | Amorphous base metal smelting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320536592.XU CN203440400U (en) | 2013-08-31 | 2013-08-31 | Amorphous base metal smelting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203440400U true CN203440400U (en) | 2014-02-19 |
Family
ID=50091469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320536592.XU Expired - Fee Related CN203440400U (en) | 2013-08-31 | 2013-08-31 | Amorphous base metal smelting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203440400U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451377A (en) * | 2013-08-31 | 2013-12-18 | 济钢集团有限公司 | Amorphous parent metal smelting method and amorphous parent metal smelting device |
-
2013
- 2013-08-31 CN CN201320536592.XU patent/CN203440400U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103451377A (en) * | 2013-08-31 | 2013-12-18 | 济钢集团有限公司 | Amorphous parent metal smelting method and amorphous parent metal smelting device |
| CN103451377B (en) * | 2013-08-31 | 2015-06-24 | 济钢集团有限公司 | Amorphous parent metal smelting method and amorphous parent metal smelting device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100557038C (en) | The smelting process of a kind of super-purity ferrite stainless steel decarburization, denitrogenation | |
| CN102179493B (en) | Vacuum continuous casting apparatus for high-temperature alloy | |
| CN202193821U (en) | Vacuum remelting and refining furnace for high-purity crystallizing magnesium | |
| CN102040219A (en) | Method for preparing high-purity silicon by purifying industrial silicon | |
| CN102173424A (en) | Method and equipment for removing phosphorus and metal impurities in ganister sand through vacuum induction melting | |
| CN100491556C (en) | Process of non-vacuum smelting and casting Cu-Ti alloy | |
| CN101643876B (en) | Super-pure smelting method for industrially producing Incone1690 alloy | |
| CN100439539C (en) | Process of producing iron alloy with low carbon and chromium | |
| CN109022826A (en) | Reduction refining integration smelting system | |
| CN103451377B (en) | Amorphous parent metal smelting method and amorphous parent metal smelting device | |
| CN203582895U (en) | Integrated ladle refining equipment | |
| CN103276231B (en) | Method for removing S and O from cast superalloy by vacuum induction smelting | |
| CN103589823A (en) | Integrated ladle refining equipment and steel-making method using the same | |
| CN203440400U (en) | Amorphous base metal smelting device | |
| CN106555224A (en) | A kind of production method and production equipment of monocrystal silicon | |
| CN210796588U (en) | Molten aluminum treatment device integrating degassing and filtering functions | |
| CN112624122A (en) | Method and device for preparing 6N polycrystalline silicon by refining industrial silicon through vacuum microwave | |
| CN201411472Y (en) | TD vacuum refining furnace | |
| CN204035497U (en) | A kind of highly efficient cooling device of neodymium iron boron processing | |
| CN206828617U (en) | Vacuum melting nickel ingot produces inert gas protection device | |
| CN100439538C (en) | Process of producing iron alloy with low carbon and manganese | |
| CN203030880U (en) | Molten iron ladle used for molten ductile iron casting | |
| CN103014244B (en) | Induction melting vacuum degassing device | |
| CN107737895A (en) | A kind of oxygen-free copper bar preparation method | |
| CN107699712B (en) | Magnesium metallurgical furnace and magnesium smelting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140219 Termination date: 20160831 |