CN203846074U - Horizontal liquid nitrogen direct-injection type forged steel cold roller sub-zero treatment equipment - Google Patents
Horizontal liquid nitrogen direct-injection type forged steel cold roller sub-zero treatment equipment Download PDFInfo
- Publication number
- CN203846074U CN203846074U CN201420105643.8U CN201420105643U CN203846074U CN 203846074 U CN203846074 U CN 203846074U CN 201420105643 U CN201420105643 U CN 201420105643U CN 203846074 U CN203846074 U CN 203846074U
- Authority
- CN
- China
- Prior art keywords
- liquid nitrogen
- casing
- workpiece
- processed
- treatment apparatus
- 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 - Lifetime
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 74
- 239000007788 liquid Substances 0.000 title claims abstract description 70
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 20
- 239000010959 steel Substances 0.000 title claims abstract description 20
- 238000002347 injection Methods 0.000 title claims abstract description 17
- 239000007924 injection Substances 0.000 title claims abstract description 17
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000005242 forging Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000008054 signal transmission Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 7
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 6
- 229910001566 austenite Inorganic materials 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- 238000000889 atomisation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 2
- 229930006000 Sucrose Natural products 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000005720 sucrose Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The utility model discloses horizontal liquid nitrogen direct-injection type forged steel cold roller sub-zero treatment equipment which comprises a workpiece treatment box body (2), wherein liquid nitrogen nozzles (8) which are arranged in rows are arranged on the inner wall of the workpiece treatment box body (2); the liquid nitrogen nozzles (8) are correspondingly arranged on the inner walls of the two sides of the workpiece treatment box body (2); the liquid nitrogen nozzles (8) are communicated with a liquid nitrogen storage tank (1) through a conveying pipeline (3); a manual control valve (4) is arranged on the conveying pipeline (3) arranged at an outlet of the liquid nitrogen storage tank (1); an electromagnetic valve (7) controlled by a control system (5) is arranged on the conveying pipeline (3) after the manual control valve (4); a temperature measuring device (10) is arranged in the workpiece treatment box body (2); the temperature measuring device (10) is connected with the control system (5) through a circuit to transmit signal. The equipment is quick in temperature decreasing speed, uniform in temperature reduction and high in production efficiency; the hardness uniformity of roller body is guaranteed; the equipment is suitable for popularization and use.
Description
Technical field
The utility model relates to a kind of equipment for forging steel cold roll sub-zero treatment, specifically fast, the lowering temperature uniform of a kind of cooling rate and the higher horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus of production efficiency.
Background technology
Cold roll is the vitals of rolled band steel cold-rolling mill, and its performance directly affects Rolling Production efficiency and the quality product of milling train.Cold roll material belongs to high-carbon, high-chromium alloy tool steel.In quenching process, have that quite a few austenite has little time to change and under being retained, part martensitic transformation can occur residual austenite in rolling process, cause roll generation microvolume to change, even can become the source region of tiny crack; Austenite is compared soft with its hetero-organization, it can affect roll hardness homogeneity, and then affects cold-rolled plate and strip, particularly the surface quality of senior cold-rolled plate and strip.Residual austenite at room temperature stops and can produce stabilization, so high performance cold roll carries out sub-zero treatment after all must quenching immediately, strictly controls the content of residual austenite, and sub-zero treatment can also improve roller surface hardness, increase depth of hardening zone.
Traditional cold roll deepfreeze equipment is generally medium-type, in case, puts into liquid medium (n-propyl alcohol) and again roll is put into medium, then low-temperature receiver (dry ice or liquid nitrogen) is passed in medium, carry out cooling.The fusing point of n-propyl alcohol is-120 ℃ of left and right, its effective use temperature conventionally in-90 ℃, and n-propyl alcohol mobility is bad at low temperatures, deepfreeze poor effect, is difficult to realize the sub-zero treatment of real meaning.In order to solve the problem and shortage existing in traditional sucrose formula sub-zero treatment process, Chinese invention patent CN101509715A " liquid nitrogen straightly-spraying cold treatment equipment " discloses a kind of vertical liquid nitrogen straightly-spraying cold treatment equipment, its processing vessel is formed by loading main body and the lid cooperation of upper shed, liquid nitrogen nozzle and blower fan are all arranged on lid, this invention equipment preferably resolves the problem existing in the use of traditional sucrose formula deepfreeze equipment, but also has a lot of shortcomings:
1, adopt single nozzle and nozzle too far away apart from roll, cannot realize roll fast cooling, affect deepfreeze effect;
2, the general height of deepfreeze casing or length are all more than 5 meters, nozzle and blower fan are installed in top, after liquid nitrogen formation low temperature nitrogen, due to proportion reason, can be in the top of casing, and being also subject to considerable influence in the working efficiency of the lower blower fan of low temperature (≤-120 ℃), the upper and lower temperature homogeneity of casing is just poor like this;
3, vertical equipment operation is extremely inconvenient, and production efficiency is not high, can only process 1 roll for every batch;
4, the loading main body of processing vessel and lid, in a kind of sealed state, due to gas port not being set, along with the gasification of liquid nitrogen in processing vessel, make processing vessel inside in a kind of high pressure conditions, are unfavorable for safety in production.
Summary of the invention
The purpose of this utility model is the deficiency existing for existing deep cold treatment apparatus, provides that a kind of cooling rate is fast, lowering temperature uniform and the higher horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus of production efficiency.
The purpose of this utility model solves by the following technical programs:
A kind of horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus, comprise liquid nitrogen storage tank, workpiece is processed casing and transport pipe, it is characterized in that: the inwall that described workpiece is processed casing is provided with the liquid nitrogen nozzle setting in a row, liquid nitrogen nozzle correspondence is arranged on workpiece and processes on the both sides inwall of casing, liquid nitrogen nozzle is connected with liquid nitrogen storage tank by transport pipe, the transport pipe in liquid nitrogen storage tank exit is provided with manual control valve, and the transport pipe after manual control valve is provided with the magnetic valve of being controlled by Controlling System, workpiece is processed in casing and is provided with temperature measuring equipment, temperature measuring equipment is connected to carry out signal transmission with Controlling System by circuit.
On the one-sided inwall of described workpiece processing casing, be at least provided with two discharge opeing nitrogen nozzles, between liquid nitrogen nozzle, be evenly distributed.
Described temperature measuring equipment is processed on cabinet wall at the workpiece between two rows liquid nitrogen nozzle.
The case lid that described workpiece is processed casing is provided with gas port.
The outer wall that described workpiece is processed casing is provided with hydraulic efficiency plant, and the movable end of hydraulic efficiency plant is connected to control the opening and closing of case lid with case lid.
Described Controlling System is provided with warning device.
Described workpiece is processed casing and is adopted lagging material to make.
The utility model has the following advantages compared to existing technology:
The utility model by adopting the densely covered liquid nitrogen nozzle of multiple spot and multi-point temperature measurement in workpiece is processed casing, guaranteed the homogeneity of temperature in workpiece processing casing, make the temperature inside the box can reach within an hour-120 ℃, realize roll fast cooling, minimum temperature can reach-190 ℃, realize the sub-zero treatment of real meaning, further improve roller performance, thereby guarantee the homogeneity of hardness of roll body.
The utility model is processed in casing spraying into uniformly workpiece after liquid nitrogen atomization by liquid nitrogen nozzle, can avoid liquid nitrogen to be sprayed on roller surface with water column shape, and cause body of roll non-uniform temperature; And this horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus can be processed 1-6 simultaneously and prop up roll, and production efficiency is higher, has indirectly reduced production cost.
Accompanying drawing explanation
Accompanying drawing 1 is structural representation of the present utility model;
Roll when accompanying drawing 2 is worked for the utility model is put and liquid nitrogen nozzle distribution schematic diagram.
Wherein: 1-liquid nitrogen storage tank; 2-workpiece is processed casing; 3-transport pipe; 4-manual control valve; 5-Controlling System; 6-warning device; 7-magnetic valve; 8-liquid nitrogen nozzle; 9-hydraulic efficiency plant; 10-temperature measuring equipment; 11-lagging material; 12-case lid; 13-gas port; 14-roll.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is further described.
As shown in Figure 1: a kind of horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus, comprise liquid nitrogen storage tank 1, the workpiece that lagging material 11 is made is processed casing 2 and transport pipe 3, it is characterized in that: the inwall that described workpiece is processed casing 2 is provided with the liquid nitrogen nozzle 8 setting in a row, liquid nitrogen nozzle 8 correspondences are arranged on workpiece and process on the both sides inwall of casing 2, on the one-sided inwall of workpiece processing casing 2, be at least provided with two discharge opeing nitrogen nozzles 8, liquid nitrogen nozzle 8 on every discharge opeing nitrogen nozzle 8 is evenly distributed each other, liquid nitrogen nozzle 8 is connected with liquid nitrogen storage tank 1 by transport pipe 3, the transport pipe 3 in liquid nitrogen storage tank 1 exit is provided with manual control valve 4, and the transport pipe 3 after manual control valve 4 is provided with the magnetic valve 7 of being controlled by Controlling System 5, in Controlling System 5, be provided with warning device 6, on every side inwall of workpiece processing casing 2, be all provided with several temperature measuring equipments 10, the workpiece that this temperature measuring equipment 10 is preferably arranged between two rows liquid nitrogen nozzle 8 is processed on the inwall of casing 2, temperature measuring equipment 10 is connected to carry out signal transmission by circuit with Controlling System 5, temperature in workpiece is processed casing 2 lower than design temperature after, warning device 6 sends alarm automatically, by Controlling System 5, regulate liquid nitrogen flow to process the temperature in casing 2 to adjust workpiece, make roll under steady temperature, carry out sub-zero treatment, and reduce liquid nitrogen usage quantity, reach energy-saving and cost-reducing object, when one-time process end of run, warning device 6 can send alarm automatically.For preventing the excessive box deformation that causes of workpiece processing casing 2 internal pressures, reduce potential safety hazard in addition, on the case lid 12 of workpiece processing casing 2, be provided with gas port 13, the quantity of gas port 13 arranges as required; The outer wall that workpiece is processed casing 2 is provided with hydraulic efficiency plant 9, and the movable end of hydraulic efficiency plant 9 and case lid 12 are connected to control the opening and closing of case lid 12.
During horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus work of the present utility model, primer fluid pressure device 9, open case lid 12, the roll 14 for the treatment of deepfreeze is placed horizontally to workpiece and processes in casing 2 (roll put with liquid nitrogen nozzle distribution schematic diagram as shown in Figure 2), primer fluid pressure device 9 is closed case lid 12, open manual control valve 4, start Controlling System 5 inputting process parameters (cooling rate, target temperature, soaking time), then operation, magnetic valve 7 moves automatically, liquid nitrogen directly sprays in workpiece processing tank 2 after 8 atomizations of liquid nitrogen nozzle by transport pipe 3, be distributed in workpiece process the temperature measuring equipment 10 of casing 2 inwall both sides real-time temperature data is fed back to Controlling System 5, Controlling System 5 is adjusted the temperature in workpiece processing casing 2 by controlling the aperture size adjustment liquid nitrogen flow of magnetic valve 6, make roll 14 complete sub-zero treatment under steady temperature, when technique completes, warning device 6 sends warning automatically, prompting operation person closes manual control valve 4, open case lid 12, roll 14 is winched to regulation region, and the upper shield cap of cover, complete the sub-zero treatment of a forging steel cold roll.
The utility model is by processing the densely covered liquid nitrogen nozzle 8 of the interior employing multiple spot of casing 2 and multi-point temperature measurement at workpiece, guaranteed the homogeneity of workpiece processing casing 2 interior temperature, make the temperature inside the box can reach within an hour-120 ℃, realize roll fast cooling, minimum temperature can reach-190 ℃, realize the sub-zero treatment of real meaning, further improve roller performance, thereby guarantee the homogeneity of hardness of roll body; By liquid nitrogen nozzle 8, by spraying into uniformly workpiece after liquid nitrogen atomization, process in casing 2 in addition, can avoid liquid nitrogen with water column shape, to be sprayed on the surface of roll, and cause body of roll non-uniform temperature; And this horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus can be processed 1-6 simultaneously and prop up roll, and production efficiency is higher, has indirectly reduced production cost.
Above embodiment is only explanation technological thought of the present utility model, can not limit protection domain of the present utility model with this, every technological thought according to the utility model proposes, any change of doing on technical scheme basis, within all falling into the utility model protection domain; The technology that the utility model does not relate to all can be realized by prior art.
Claims (7)
1. a horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus, comprise liquid nitrogen storage tank (1), workpiece is processed casing (2) and transport pipe (3), it is characterized in that: the inwall that described workpiece is processed casing (2) is provided with the liquid nitrogen nozzle (8) setting in a row, liquid nitrogen nozzle (8) correspondence is arranged on workpiece and processes on the both sides inwall of casing (2), liquid nitrogen nozzle (8) is connected with liquid nitrogen storage tank (1) by transport pipe (3), the transport pipe (3) in liquid nitrogen storage tank (1) exit is provided with manual control valve (4), and manual control valve (4) transport pipe (3) is afterwards provided with the magnetic valve (7) of being controlled by Controlling System (5), workpiece is processed in casing (2) and is provided with temperature measuring equipment (10), temperature measuring equipment (10) is connected to carry out signal transmission by circuit with Controlling System (5).
2. horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus according to claim 1, is characterized in that: on the one-sided inwall of described workpiece processing casing (2), be at least provided with two discharge opeing nitrogen nozzles (8), liquid nitrogen nozzle is evenly distributed between (8).
3. horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus according to claim 2, is characterized in that: the workpiece that described temperature measuring equipment (10) is positioned between two rows liquid nitrogen nozzle (8) is processed on casing (2) inwall.
4. horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus according to claim 1, is characterized in that: the case lid (12) that described workpiece is processed casing (2) is provided with gas port (13).
5. horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus according to claim 4, it is characterized in that: the outer wall that described workpiece is processed casing (2) is provided with hydraulic efficiency plant (9), the movable end of hydraulic efficiency plant (9) and case lid (12) are connected to control the opening and closing of case lid (12).
6. horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus according to claim 1, is characterized in that: described Controlling System (5) is provided with warning device (6).
7. horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus according to claim 1, is characterized in that: described workpiece is processed casing (2) and adopted lagging material (11) to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420105643.8U CN203846074U (en) | 2014-03-10 | 2014-03-10 | Horizontal liquid nitrogen direct-injection type forged steel cold roller sub-zero treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420105643.8U CN203846074U (en) | 2014-03-10 | 2014-03-10 | Horizontal liquid nitrogen direct-injection type forged steel cold roller sub-zero treatment equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203846074U true CN203846074U (en) | 2014-09-24 |
Family
ID=51559112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420105643.8U Expired - Lifetime CN203846074U (en) | 2014-03-10 | 2014-03-10 | Horizontal liquid nitrogen direct-injection type forged steel cold roller sub-zero treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203846074U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103834780A (en) * | 2014-03-10 | 2014-06-04 | 宜兴市永昌轧辊有限公司 | Horizontal liquid nitrogen direct injection type subzero treatment equipment of steel forging cold roll |
| CN107427876A (en) * | 2015-04-10 | 2017-12-01 | 首要金属科技奥地利有限责任公司 | The cooling device and method of working roll |
| CN111365919A (en) * | 2020-04-16 | 2020-07-03 | 无锡爱思科仪器有限公司 | Gas-phase and liquid-phase cryogenic system |
-
2014
- 2014-03-10 CN CN201420105643.8U patent/CN203846074U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103834780A (en) * | 2014-03-10 | 2014-06-04 | 宜兴市永昌轧辊有限公司 | Horizontal liquid nitrogen direct injection type subzero treatment equipment of steel forging cold roll |
| CN103834780B (en) * | 2014-03-10 | 2016-03-09 | 宜兴市永昌轧辊有限公司 | A kind of horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus |
| CN107427876A (en) * | 2015-04-10 | 2017-12-01 | 首要金属科技奥地利有限责任公司 | The cooling device and method of working roll |
| CN107427876B (en) * | 2015-04-10 | 2019-08-06 | 首要金属科技奥地利有限责任公司 | The cooling device and method of working roll |
| CN111365919A (en) * | 2020-04-16 | 2020-07-03 | 无锡爱思科仪器有限公司 | Gas-phase and liquid-phase cryogenic system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103834780B (en) | A kind of horizontal liquid nitrogen direct injection forging steel cold roll deep cold treatment apparatus | |
| CN102069097A (en) | System and process for cooling after H-shaped steel is hot-rolled | |
| CN203846074U (en) | Horizontal liquid nitrogen direct-injection type forged steel cold roller sub-zero treatment equipment | |
| CN104550275A (en) | Method and device for spray evaporation cooling of hot-rolled high-strength rebar | |
| CN105369021A (en) | On-line quenching and cooling method taking account of shape and performance of thin-specification high-strength steel plate | |
| CN102248012B (en) | Cooling device and method for hot-rolling process of wire rod | |
| CN115386699A (en) | 2-4 mm high-strength steel plate roller type air quenching device | |
| CN105779724A (en) | Control method for banded structures of gear steel and gear steel | |
| CN205732313U (en) | Intermediate blank quickly cooling device | |
| CN102912091A (en) | Method and cooling system for improving comprehensive mechanical property of normalized steel plate | |
| CN107287397B (en) | A kind of hot continuous-milling steel plate cooling device for thermal treatment and control method | |
| CN102974628A (en) | Aerial fog cooling device for wire air-cooling line | |
| CN103286147B (en) | Hot-rolled board strip production line laminar cooling method | |
| CN104046762B (en) | A kind of quenching method of major-diameter thick-wall pressure cylinder | |
| CN103706645A (en) | Method for shortening temperature holding time of intermediate billet in process of hot continuous rolling | |
| CN103233112A (en) | Quenching and tempering heat treatment equipment and method for 4-6mm high-strength sheet | |
| CN101701284A (en) | Heat treatment method for steel rail | |
| CN202667290U (en) | Horizontal sweeping device for furnace rolling mill | |
| CN204999938U (en) | Aluminum alloy pole water quenching device | |
| CN106498132A (en) | High-pressure gas quenching process for die | |
| CN106011397B (en) | 42CrMo bars control water quenching heat-treatment technology method | |
| CN205732312U (en) | Automatic atomising spraying cooling temperature regulating device | |
| CN204779696U (en) | Handle water -chilling plant of many steel wires | |
| CN205834146U (en) | The chiller of the secondary cooling section of continuous caster improved | |
| CN204898018U (en) | Energy -saving sub zero treatment makes up case |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140924 |
|
| CX01 | Expiry of patent term |