CN208502706U - A kind of intermittent downhole tractor - Google Patents
A kind of intermittent downhole tractor Download PDFInfo
- Publication number
- CN208502706U CN208502706U CN201821005319.3U CN201821005319U CN208502706U CN 208502706 U CN208502706 U CN 208502706U CN 201821005319 U CN201821005319 U CN 201821005319U CN 208502706 U CN208502706 U CN 208502706U
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- China
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- inner tube
- shaft
- outer tube
- piston rod
- transmission
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Abstract
The utility model relates to a kind of intermittent downhole tool tractors, belong to petroleum gas underground technical field of tools.Turbine wheel shaft is installed in inner tube, output shaft is equipped with by output shaft bearing in inner tube below turbine wheel shaft, the other end end of output shaft is equipped with bevel pinion, transmission mechanism is provided in inner tube below bevel pinion, bevel pinion engages connection with transmission mechanism, and oil cylinder is equipped in the inner tube below transmission mechanism, passes through spring in oil cylinder and piston rod is housed, one end of piston rod extends to oil cylinder outer end, and the piston rod for extending to oil cylinder outer end is connect with transmission mechanism interval；The intermittent downhole tractor has structure simple, and power source is single, and obstacle climbing ability is strong, the big feature of tractive force, can effectively solve that existing tractor tractive force is small, and obstacle climbing ability is weak, frictional resistance is big when horizontal well and extended reach well logger etc. being caused to discharge, and discharges difficult problem；It works especially suitable for severe conditions down-hole.
Description
Technical field
The utility model relates to a kind of intermittent downhole tool tractors, belong to petroleum gas underground technical field of tools.
Background technique
Downhole tractor device is also known as underground crawl device, is the main conveyance of present level borehole logging tool, and gradually to
The development of the application aspects such as Microdrilling drilling well and underground work.Severe formation condition proposes very high want to the performance of tractor
It asks, domestic there is presently no mature high-caliber products.The driving wheel of common wheeled tractor is because of and sleeve interface
Product is small, causes tractive force small, obstacle climbing ability is weak.Although telescopic tractor can provide big tractive force because size compared with
Long, the well section for encountering constant slope is easy to be stuck.Therefore, it is strong to research and develop a kind of obstacle climbing ability, size is small and power source stabilization is held
Continuous tractor pole it is necessary to.
Summary of the invention
The purpose of this utility model is that: providing one kind has obstacle climbing ability strong, and the big feature of tractive force can effectively solve
Existing tractor tractive force is small, and obstacle climbing ability is weak, and frictional resistance is big when horizontal well and extended reach well logger etc. being caused to discharge,
Discharge the intermittent downhole tractor of difficult problem.
The technical solution of the utility model is:
A kind of intermittent downhole tractor, including top connection, inner tube, turbine wheel shaft, outer tube, output shaft, centralizing support device,
Oil cylinder and piston rod are constituted, it is characterised in that: upper end of inner tube screw thread is equipped with top connection, and inner tube is interior by turbine assembly and symmetrical
The turbine bearing of setting is equipped with turbine wheel shaft, is equipped with output shaft by output shaft bearing in the inner tube below turbine wheel shaft, exports
One end of axis is fixedly connected with turbine wheel shaft, and the other end end of output shaft is equipped with bevel pinion, in the inner tube below bevel pinion
It is provided with transmission mechanism, bevel pinion engages connection with transmission mechanism, oil cylinder, oil cylinder are equipped in the inner tube below transmission mechanism
Interior that piston rod is housed by spring, one end of piston rod extends to oil cylinder outer end, extends to piston rod and the transmission of oil cylinder outer end
Machine interval connects.
It is provided with slide opening in the corresponding inner tube of transmission mechanism, is movably installed with outer tube in inner tube corresponding with slide opening, is passed
Motivation structure engages connection with outer tube by slide opening, is equipped with centralizing support by righting spring in the inner tube above outer tube
Device is equipped with support device on outer tube lower circumferential, is fixed with telescoping cylinder, telescoping cylinder one end on the outer tube below support device
It is connect with support device, the telescoping cylinder other end is connected to by flexible pipe with oil cylinder.
The transmission mechanism by transmission shaft A, transmission shaft B, bevel gear wheel, cam, partial gear, transmission gear A and
Transmission gear B is constituted, and inner tube diameter is equipped with bevel gear wheel and transmission gear A, auger tooth on transmission shaft A to transmission shaft A is equipped with
Wheel engages connection with bevel pinion, and partial gear is housed on the transmission shaft A between bevel gear wheel and transmission gear A；Transmission shaft A
Connection, transmission gear B mono- are engaged equipped with transmission gear B, transmission gear B and transmission gear A by transmission shaft B in the inner tube of lower section
Cam is installed, cam is connect with piston rod interval on the transmission shaft B of side.
Driving cog is provided on the corresponding outer sleeve inner wall of the partial gear, partial gear is by slide opening and passes
Movable tooth engagement connection.
The inner tube is reducer pipe, and the bottom of inner tube is in closure shape.
It is provided with sliding slot in inner tube above slide opening, banking pin is provided on outer tube, outer tube passes through banking pin and cunning
The cooperation sliding sleeve dress of slot is on inner pipe.
The centralizing support device is made of upper fixed ring, lower slip ring, upper righting rod, lower righting rod and support righting rod,
Multiple upper righting rods are evenly equipped with by pin shaft on the circumference of upper fixed ring, shape corresponding with upper fixed ring passes through on the circumference of lower slip ring
Pin shaft is evenly equipped with multiple lower righting rods；Upper righting rod and lower righting rod are connected with each other by pin shaft by support righting rod.
The support device is by support base, connecting rod, upper support bar, lower support bar, intermediate bar, elastic piece and supporting slip ring
It constitutes, is slidably fitted with supporting slip ring on the outer tube circumference below support base, passes through company on the support base above supporting slip ring
Lug and pin shaft are in that symmetry shape is equipped with multiple upper support bars and lower support bar, are led between upper support bar and lower support bar by pin shaft
Intermediate bar interconnection is crossed, elastic piece is fixed on intermediate bar, it is corresponding with lower support bar to pass through pin shaft in the supporting slip ring
Multiple connecting rods are installed, one end of connecting rod is connect by pin shaft with lower support bar.
The support base is cylindrical body, and support base is threadably mounted on outer tube.
The elastic piece is arc body, and support spring is provided between intermediate bar and elastic piece.
The telescoping cylinder is made of cylinder body, telescopic piston rod and telescoping cylinder spring, is filled in cylinder body by telescoping cylinder spring
There is telescopic piston rod, one end of telescopic piston rod extends to cylinder body outer end, extends to the telescopic piston rod and support of cylinder body outer end
Slip ring is fixedly connected.Telescoping cylinder is packed on outer tube by cylinder body.
The utility model beneficial effect is:
In use, drilling fluid drives turbine wheel shaft to rotate to the intermittent downhole tractor by turbine assembly, thus
The rotation of cone gear is driven by output shaft, thus drives partial gear and cam rotation.Partial gear turns counterclockwise
During dynamic, contacted with the rack gear on outer sleeve inner wall, so that outer tube be made to move upwards, at the same time, the rise of cam with
The plunger rod contacts of oil cylinder, piston rod move down, and the hydraulic oil of extrusion oil cylinder, hydraulic oil enters telescoping cylinder by flexible pipe,
To push telescoping cylinder motion bar to move up, so that support device is in holding state and block the borehole wall, keep inner tube downward
Movement.Repeatedly, the intermittent movement (downward) forward of tractor is realized.The tractor has structure simple, power source
Single, obstacle climbing ability is strong, the big feature of tractive force, can effectively solve that existing tractor tractive force is small, and obstacle climbing ability is weak, leads to water
Frictional resistance is big when horizontal well and extended reach well logger etc. discharge, and discharges difficult problem；Especially suitable for severe underground item
Part work.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the side structure schematic view of Fig. 1；
Fig. 3 is enlarged diagram at A in Fig. 1；
Fig. 4 is enlarged diagram at A in Fig. 2；
Fig. 5 is the holding state schematic diagram of the support device of the utility model；
Fig. 6 is the contraction state schematic diagram of the support device of the utility model.
In figure: 1, top connection, 2, inner tube, 3, turbine wheel shaft, 4, outer tube, 5, output shaft, 6, flexible pipe, 7, oil cylinder, 8, work
Stopper rod, 9, turbine assembly, 10, turbine bearing, 11, output shaft bearing, 12, water outlet, 13, bevel pinion, 14, transmission shaft A,
15, transmission shaft B, 16, bevel gear wheel, 17, cam, 18, partial gear, 19, transmission gear A, 20, transmission gear B, 21, cunning
Hole, 22, sliding slot, 23, banking pin, 24, driving cog, 25, upper fixed ring, 26, lower slip ring, 27, upper righting rod, 28, lower righting rod,
29, support righting rod, 30, righting spring, 31, spring, 32, support base, 33, connecting rod, 34, upper support bar, 35, lower support bar,
36, intermediate bar, 37, elastic piece, 38, supporting slip ring, 39, support spring, 40, cylinder body, 41, telescopic piston rod, 42, telescoping cylinder
Spring.
Specific embodiment
The intermittent downhole tractor includes top connection 1, inner tube 2, turbine wheel shaft 3, outer tube 4, output shaft 5, centralizing support
Device, oil cylinder 7 and piston rod 8 are constituted, and inner tube 2 is reducer pipe, and 2 threaded upper ends of inner tube are equipped with top connection 1, and the bottom of inner tube 2 is in
Block shape.
Turbine wheel shaft 3 is equipped with by turbine assembly 9 and symmetrically arranged turbine bearing 10 in inner tube 2, turbine assembly 9 includes
Turbine rotor and include turbine stator.It is evenly equipped with water outlet 12 on corresponding 2 circumference of inner tube in 9 lower section of turbine assembly, water outlet 12 is used
The discharge of drilling fluid when work.
Output shaft 5, one end of output shaft 5 and turbine are equipped with by output shaft bearing 11 in the inner tube 2 of 3 lower section of turbine wheel shaft
Axis 3 is fixedly connected.When work, under the impact of drilling fluid, turbine wheel shaft 3 is driven to rotate by turbine rotor, and then drive output
Axis 5 rotates, and the other end end of output shaft 5 is equipped with bevel pinion 13, is provided with driver in the inner tube 2 of 13 lower section of bevel pinion
Structure.
Transmission mechanism is by transmission shaft A14, transmission shaft B15, bevel gear wheel 16, cam 17, partial gear 18, transmission gear
A19 and transmission gear B20 is constituted, and transmission shaft A14 is radially equipped in inner tube 2, and bevel gear wheel 16 is housed on transmission shaft A14 and is passed
Moving gear A19, bevel gear wheel 16 engage connection, the transmission shaft between bevel gear wheel 16 and transmission gear A19 with bevel pinion 13
Partial gear 18 is housed on A14.Transmission gear B20, transmission are equipped with by transmission shaft B15 in inner tube 2 below transmission shaft A14
Gear B 20 engages connection with transmission gear A19, is equipped with cam 17 on the transmission shaft B15 of the side transmission gear B20.Driver
Oil cylinder 7 is installed in the inner tube 2 below structure, passes through spring 31 in oil cylinder 7 and piston rod 8 is housed, one end of piston rod 8 extends to oil
7 outer end of cylinder, the piston rod 8 for extending to 7 outer end of oil cylinder are connect with 17 Intermittent Contact of cam.
Outer tube 4, the corresponding inner tube of partial gear 18 of transmission mechanism are set in the corresponding inner tube 2 of transmission mechanism
Axially symmetric shape is provided with slide opening 21 on 2, is provided with driving cog 24 on 4 inner wall of outer tube corresponding with slide opening 21, not exclusively
Tooth 18 engages connection with driving cog 24 by slide opening 21.It is provided with sliding slot 22 in the inner tube 2 of 21 top of slide opening, is set on outer tube 4
It is equipped with banking pin 23, outer tube 4 is by the cooperation sliding sleeve of banking pin 23 and sliding slot 22 in inner tube 2.Banking pin 23 and cunning
The purpose of cooperation of slot 22 is the slippage prevented between outer tube 4 and inner tube 2.
Centralizing support device 6 is equipped with by upper card slot, lower bayonet slot and righting spring 30 in the inner tube 2 of 4 top of outer tube, is helped
Positive eyelid retractor is made of upper fixed ring 25, lower slip ring 26, upper righting rod 27, lower righting rod 28 and support righting rod 29, upper fixation
Multiple upper righting rods 27 are evenly equipped with by pin shaft on the circumference of ring 25, shape corresponding with upper fixed ring 25 is logical on the circumference of lower slip ring 26
It crosses pin shaft and is evenly equipped with multiple lower righting rods 28；Upper righting rod 27 is mutually interconnected by pin shaft by support righting rod 29 with lower righting rod 28
It connects.The upper fixed ring 25 of centralizing support device is fixed in card slot, and the lower slip ring 26 of centralizing support device is sliding by righting spring 30
It is dynamic to be mounted in lower bayonet slot.
On 4 lower circumferential of outer tube be equipped with support device, support device by support base 32, connecting rod 33, upper support bar 34, under
Support rod 35, intermediate bar 36, elastic piece 37 and supporting slip ring 38 are constituted, and support base 32 is cylindrical body, the installation of 32 screw thread of support base
On outer tube 4.Supporting slip ring 38 is slidably fitted on 4 circumference of outer tube of 32 lower section of support base, 38 top of supporting slip ring
Multiple upper support bars 34 and lower support bar 35, upper support bar 34 are equipped in symmetry shape by engaging lug and pin shaft on support base 32
It is connected with each other by pin shaft by intermediate bar 36 between lower support bar 35, elastic piece 37, elastic piece 37 is fixed on intermediate bar 36
For arc body, support spring 39 is provided between intermediate bar 36 and elastic piece 37.Pass through pin shaft and lower support in supporting slip ring 38
Bar 35 is corresponding to be equipped with multiple connecting rods 33, and one end of connecting rod 33 is connect by pin shaft with lower support bar 35.
Telescoping cylinder is fixed on outer tube 4 below support device, telescoping cylinder is by cylinder body 40, telescopic piston rod 41 and stretches
Cylinder spring 42 is constituted, and telescopic piston rod 41 is housed by telescoping cylinder spring 42 in cylinder body 40, and one end of telescopic piston rod 41 extends
To 40 outer end of cylinder body, the telescopic piston rod 41 for extending to 40 outer end of cylinder body is fixedly connected with supporting slip ring 38.Telescoping cylinder passes through cylinder
Body 40 is fixedly connected with the lower end end surface of outer tube 4；The cylinder body 40 of telescoping cylinder is connected to by flexible pipe 6 with oil cylinder 7.Flexible pipe
6 have certain elasticity, can extend under the effect of external force；External force is restored to reset condition after eliminating.
In the intermittent downhole tractor course of work, centralizing support device is kept to neutrality, when work, in rushing for drilling fluid
It hits down, drives turbine wheel shaft 3 to rotate by turbine rotor, and then drive output shaft 5 to rotate and pass through bevel pinion 13, bevel gear wheel
16 drive transmission shaft A14 are rotated counterclockwise, and transmission shaft A14 drives transmission shaft B15 by transmission gear A19 and transmission gear B20
It rotates clockwise, thus rotates counterclockwise partial gear 18, cam 17 rotates clockwise.During this, when incomplete
When the tooth of gear 18 is gradually engaged with the driving cog 24 on 4 right side of outer tube；It drives and generates opposite fortune between outer tube 4 and inner tube 2
Dynamic, i.e., outer tube 4 moves upwards, and inner tube 2 moves downward, and at the same time, cam 17 is gradually contacted with piston rod 8 and forces piston
8 downlink of bar；During 8 downlink of piston rod, the hydraulic oil in extrusion oil cylinder 7 enters in cylinder body 40 through flexible pipe 6, to push
41 uplink of telescopic piston rod, so that telescopic piston rod 41 pushes 38 uplink of supporting slip ring, due to passing through pin shaft in supporting slip ring 38
It is corresponding with lower support bar 35 that multiple connecting rods 33 are installed, and one end of connecting rod 33 is connect by pin shaft with lower support bar 35, is supported
During 38 uplink of slip ring, support device is pushed to strut, makes it through elastic piece 37 and block the borehole wall, form outer tube 4 and well
It is relatively fixed between wall.The elastic piece 37 of the support device can increase the contact area with the borehole wall under pressure, can have
Effect adapts to the variation of borehole wall radius.It is opposite between outer tube 4 and inner tube 2 while relatively fixed between outer tube 4 and the borehole wall
Move to range；I.e. inner tube 2 moves to the most low spot.
When the tooth of partial gear 18 is gradually engaged with the driving cog 24 in 4 left side of outer tube；Cam 17 is detached from and piston
The contact of bar 8, under the action of spring 31,8 uplink of piston rod resets, while telescopic piston under the action of telescoping cylinder spring 42
41 downlink of bar resets, and thus drives 38 downlink of supporting slip ring to reset and squeeze the hydraulic oil in cylinder body 40 and is back in oil cylinder 7, complete
At pressure release, the softened state of support device is released.
While the softened state of support device releases, the formation of driving cog 24 in 4 left side of partial gear 18 and outer tube
Engagement, to drive outer tube 4 along 2 downlink of inner tube, make when outer tube 4 comes downwards to range, partial gear 18 be detached from
24 meshing state of driving cog in the left side of outer tube 4, at this point, cam 17 is contacted with gradually forming for piston rod 8 again, as a result, one
A working cycles are completed；Repeatedly, realize the tractor intermittent (wriggling) forward or the purpose that moves downward.
The intermittent downhole tractor has structure simple, and power source is single, and obstacle climbing ability is strong, the big feature of tractive force,
It can effectively solve that existing tractor tractive force is small, and obstacle climbing ability is weak, when horizontal well and extended reach well logger etc. being caused to discharge
Frictional resistance is big, discharges difficult problem；It works especially suitable for severe conditions down-hole.
Claims (10)
1. a kind of intermittent downhole tractor, including top connection (1), inner tube (2), turbine wheel shaft (3), outer tube (4), output shaft
(5), centralizing support device, oil cylinder (7) and piston rod (8) are constituted, it is characterised in that: inner tube (2) threaded upper ends are equipped with top connection
(1), it is equipped with turbine wheel shaft (3) in inner tube (2) by turbine assembly (9) and symmetrically arranged turbine bearing (10), turbine wheel shaft (3)
It is equipped with output shaft (5) in the inner tube (2) of lower section by output shaft bearing (11), one end and turbine wheel shaft (3) of output shaft (5) are solid
The other end end of fixed connection, output shaft (5) is equipped with bevel pinion (13), setting in the inner tube (2) below bevel pinion (13)
There is transmission mechanism, bevel pinion (13) engages connection with transmission mechanism, is equipped with oil cylinder in the inner tube (2) below transmission mechanism
(7), piston rod (8) are housed by spring (31) in oil cylinder (7), one end of piston rod (8) extends to oil cylinder (7) interior outer end, prolongs
The piston rod (8) for extending to oil cylinder (7) interior outer end is connect with driver interval.
2. a kind of intermittent downhole tractor according to claim 1, it is characterised in that: the transmission mechanism is corresponding
It is provided in inner tube (2) slide opening (21), is movably installed with outer tube (4), transmission mechanism on inner tube (2) corresponding with slide opening (21)
Connection is engaged with outer tube (4) by slide opening (21), is installed in the inner tube (2) above outer tube (4) by righting spring (30)
There is centralizing support device, support device is housed on outer tube (4) lower circumferential, is fixed on the outer tube (4) below support device
Telescoping cylinder, telescoping cylinder one end are connect with support device, and the telescoping cylinder other end is connected to by flexible pipe (6) with oil cylinder (7).
3. a kind of intermittent downhole tractor according to claim 2, it is characterised in that: the transmission mechanism is by being driven
Axis A(14), transmission shaft B(15), bevel gear wheel (16), cam (17), partial gear (18), transmission gear A(19) and transmission
Gear B (20) is constituted, and inner tube is radially equipped with transmission shaft A(14 in (2)), transmission shaft A(14) on equipped with bevel gear wheel (16) and
Transmission gear A(19), bevel gear wheel (16) engages connection, bevel gear wheel (16) and transmission gear A(19 with bevel pinion (13))
Between transmission shaft A(14) on be equipped with partial gear (18)；Transmission shaft A(14) below inner tube (2) in pass through transmission shaft B
(15) transmission gear B(20 is housed), transmission gear B(20) connection, transmission gear B(20 are engaged with transmission gear A(19)) side
Transmission shaft B(15) on be equipped with cam (17), cam (17) and piston rod (8) interval are connect.
4. a kind of intermittent downhole tractor according to claim 3, it is characterised in that: the partial gear (18)
It is provided with driving cog (24) on corresponding outer tube (4) inner wall, partial gear (18) is engaged by slide opening with driving cog (24)
Connection；The inner tube (2) is reducer pipe, and the bottom of inner tube (2) is in closure shape.
5. a kind of intermittent downhole tractor according to claim 2, it is characterised in that: the inner tube above slide opening (21)
(2) it is provided with sliding slot (22), is provided on outer tube (4) banking pin (23) on, outer tube (4) passes through banking pin (23) and sliding slot
(22) cooperation sliding sleeve is on inner tube (2).
6. a kind of intermittent downhole tractor according to claim 2, it is characterised in that: the centralizing support device is by upper
Fixed ring (25), lower slip ring (26), upper righting rod (27), lower righting rod (28) and support righting rod (29) are constituted, upper fixed ring
(25) multiple upper righting rods (27) are evenly equipped with by pin shaft on circumference, it is right with upper fixed ring (25) on the circumference of lower slip ring (26)
Shape is answered to be evenly equipped with multiple lower righting rods (28) by pin shaft；Upper righting rod (27) and lower righting rod (28) are helped by pin shaft by support
Positive bar (29) is connected with each other.
7. a kind of intermittent downhole tractor according to claim 2, it is characterised in that: the support device is by supporting
Seat (32), connecting rod (33), upper support bar (34), lower support bar (35), intermediate bar (36), elastic piece (37) and supporting slip ring (38)
It constitutes, is slidably fitted with supporting slip ring (38) on outer tube (4) circumference below support base (32), above supporting slip ring (38)
Multiple upper support bars (34) and lower support bar (35), upper branch are equipped in symmetry shape by engaging lug and pin shaft on support base (32)
It is connected with each other, is fixedly mounted on intermediate bar (36) flexible by intermediate bar (36) by pin shaft between strut (34) and lower support bar (35)
Piece (37) is equipped with multiple connecting rods (33), connecting rod by the way that pin shaft is corresponding with lower support bar (35) in the supporting slip ring (38)
(33) one end is connect by pin shaft with lower support bar (35).
8. a kind of intermittent downhole tractor according to claim 7, it is characterised in that: the support base (32) is cylinder
Shape body, support base (32) are threadably mounted on outer tube (4).
9. a kind of intermittent downhole tractor according to claim 7, it is characterised in that: the elastic piece (37) is arc
Body is provided with support spring (39) between intermediate bar (36) and elastic piece (37).
10. a kind of intermittent downhole tractor according to claim 2, it is characterised in that: the telescoping cylinder is by cylinder body
(40), telescopic piston rod (41) and telescoping cylinder spring (42) are constituted, by telescoping cylinder spring (42) equipped with flexible in cylinder body (40)
Piston rod (41), one end of telescopic piston rod (41) extend to cylinder body (40) outer end, extend to the flexible work of cylinder body (40) outer end
Stopper rod (41) is fixedly connected with supporting slip ring (38)；Telescoping cylinder is packed on outer tube (4) by cylinder body (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821005319.3U CN208502706U (en) | 2018-06-28 | 2018-06-28 | A kind of intermittent downhole tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821005319.3U CN208502706U (en) | 2018-06-28 | 2018-06-28 | A kind of intermittent downhole tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208502706U true CN208502706U (en) | 2019-02-15 |
Family
ID=65282700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821005319.3U Expired - Fee Related CN208502706U (en) | 2018-06-28 | 2018-06-28 | A kind of intermittent downhole tractor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208502706U (en) |
-
2018
- 2018-06-28 CN CN201821005319.3U patent/CN208502706U/en not_active Expired - Fee Related
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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: 20190215 Termination date: 20210628 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |