CN206129201U - Sand control backwashing valve is adopted to machine - Google Patents
Sand control backwashing valve is adopted to machine Download PDFInfo
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- CN206129201U CN206129201U CN201621112935.XU CN201621112935U CN206129201U CN 206129201 U CN206129201 U CN 206129201U CN 201621112935 U CN201621112935 U CN 201621112935U CN 206129201 U CN206129201 U CN 206129201U
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- positive stop
- stop lug
- outer tube
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Abstract
The utility model relates to an oil extracting worker journey backwashing valve technical field is a sand control backwashing valve is adopted to machine, and it includes top connection, inner tube, urceolus, shearing inner ring, valve cone, a support section of thick bamboo, outer compression spring, disk seat and lower clutch, and side seal fixed mounting is in the same place in the lower part outside of top connection and the upper portion of urceolus, and the inboard upper portion outside with the lower clutch in lower part of urceolus is sealed up fixed mounting and is in the same place spacing boss outside the lower part outside of disk seat is fixed with. The utility model has the advantages of reasonable and compact structure, convenient to use, it can only go upward the pump well -flushing and can not go into the stratum down at well -flushing in -process, flushing fluid, under the prerequisite of solving the holddown problem, overflowed the passageway to be closed, prevented effectively that flushing fluid from going into the stratum through overflowing under the passageway to avoided because stratum leakage that the well -flushing led to the fact, in addition, saved and taked the workover rig to play the operating expenses that mode that the out oil pump rinsed or traded the pump was brought.
Description
Technical field
This utility model is related to petroleum production engineering backwash valve technical field, is that a kind of machine adopts sand control backwash valve.
Background technology
During the digging construction operation of straight well or exceptional well, due to formation sand production, easily there is holddown phenomenon, this is just
Need well-flushing forward or backwards.Some oil field block such as Tarim Basin stratum are easily missed, once the flushing fluid in washing well process
Into stratum, well is not only washed, and reservoir is polluted.Meanwhile, in response to the call of cost efficiency, Tarim Basin oil
Tian companies propose the scheme that machine adopts-well-flushing-water filling integration.Conventional backwash valve is served only in the construction of the completions such as pressure break, and
It is useless in recover the oil construction in.And when each block in Tarim Basin runs into holddown in the past, do not adopt well-flushing to solve the problems, such as holddown, because
When its well-flushing, flushing fluid is toward on well, stratum two is all walked, and easily causes leakage.So construction department typically takes well workover
Machine plays the mode that pump was cleaned or changed to oil outlet pump, and it is operating expenses that this is greatly increased.
The content of the invention
This utility model adopts sand control backwash valve there is provided a kind of machine, overcomes the deficiency of above-mentioned prior art, and which can be effective
When solving existing employing well-flushing mode and solving holddown, there is a problem of easily causing formation leakage.
The technical solution of the utility model is realized by following measures：A kind of machine adopts sand control backwash valve, including upper
Joint, outer tube, shearing internal ring, valve cone, support tube, external compression spring, valve seat and lower contact, the lower outside of top connection with it is outer
The upper inner sealing of cylinder is fixedly installed togather, and the lower inside of outer tube is fixedly mounted on the upper outside sealing of lower contact
Together, the lower outside in valve seat is fixed with outer positive stop lug boss, is fixed with interior positive stop lug boss, outer limit in the lower inside of lower contact
The outside of position boss is fixedly installed togather with the upper inner sealing of interior positive stop lug boss, and valve seat axis direction is provided with axle
Hole, valve cone are located on the inside of the outer tube above valve seat, between the lower outside and valve seat of valve cone are provided with interior compression spring,
Support tube and external compression spring from-inner-to-outer are sequentially arranged on the interior positive stop lug boss and outer positive stop lug boss on the outside of valve cone, in valve
Ring cavity is formed between cone and support tube, the upper inner of valve seat the interior frustum of taper wide at the top and narrow at the bottom is provided with, in valve cone
Lower end outside be provided with the outer frustum that can be held out against with interior frustum, between interior frustum and outer frustum formed can make axis hole and ring
The flow channels that chamber communicates, circumferentially have at least one radial direction flowing hole communicated with ring cavity, on valve cone in valve cone
Be fixed with the outside of the upper end of body and boss can be slided with support tube tip contact, have distance sliding between boss and support tube,
Inner core is set between boss and the lower inside of top connection sliding, seal boss is fixed with the outside of the middle part of inner core, it is close
The outside of envelope boss is set in together with the inside middle portion sealing of outer tube, and excessively stream chamber is formed between seal boss and lower contact
Room, circumferentially has at least one radial direction pod apertures communicated with excessively stream chamber on outer tube corresponding with excessively stream chamber, sliding
The distance between row boss and support tube pass through at least one more than the distance between inner core top and top connection bottom, shearing internal ring
Individual shear pin is arranged on the inside of the outer tube between seal boss and external compression spring.
The further optimization and/or improvements to above-mentioned utility model technical scheme are presented herein below：
The inside middle portion of above-mentioned outer tube is fixed with sealing corresponding with inside and outside seal boss and coordinates boss, outside seal boss
Side coordinates the inner seal of boss to be set in together with sealing, is set with shearing outer between sealing cooperation boss and lower contact
Ring, shearing internal ring are installed together by least one shear pin with shearing outer shroud from-inner-to-outer, shear internal ring and external pressure
Contracting spring is corresponded to up and down；Or/and, there is spacing between the top of the bottom of seal boss and shearing internal ring.
The lower end inside of above-mentioned top connection is provided with and holds out against concave station, and the upper end of inner core holds out against and holding out against in concave station.
The upper outside of above-mentioned valve cone holds out against boss outside being fixed with, and slides boss fixation and is held out against outside the top of boss outside
Side, interior compression spring are installed and are held out against between boss and valve seat outside；Or/and, support tube is while seat is in outer positive stop lug boss and interior limit
On the boss of position.
The lower end inside of above-mentioned top connection be installed between on the outside of the inner core above excessively stream chamber at least together with
Sealing ring, be installed between the outside of seal boss and the inside middle portion of outer tube at least together with sealing ring, connect upper
Head lower outside be installed between on the inside of the outer tube above radial direction pod apertures at least together with sealing ring, under outer tube
Be installed with and the upper outside of lower contact between on the inside of portion at least together with sealing ring, the outside of outer positive stop lug boss with it is interior
Sealing ring at least together is installed between the upper inner of positive stop lug boss.
The lower outside of above-mentioned top connection is threadably secured with the upper inner of outer tube and is installed together, the bottom of outer tube
Inner side is threadably secured with the upper outside of lower contact and is installed together, and the outside of outer positive stop lug boss is upper with interior positive stop lug boss
It is threadably secured on the inside of portion and is installed together；Or/and, the top of valve seat is provided with frock blind hole；Or/and, in top connection
Top be provided with female thread or external screw thread, the bottom of lower contact is provided with female thread or external screw thread.
This utility model reasonable and compact in structure, easy to use,, in washing well process, flushing fluid up can only be crossed pump and wash for which
Well and stratum can not be entered down, on the premise of holddown is solved the problems, such as, flow channels are closed, and are effectively prevented flushing fluid and pass through
Enter stratum under circulation road, so as to avoid the formation leakage caused due to well-flushing, in addition, eliminate taking workover rig fuel-displaced
Pump is cleaned or is changed the operating expenses that the mode of pump is brought.
Description of the drawings
Accompanying drawing 1 is main view half section structural representation of this utility model most preferred embodiment in non-well-flushing state.
Coding in accompanying drawing is respectively：1 is top connection, and 2 is outer tube, and 3 are shearing internal ring, and 4 is valve cone, and 5 is support tube,
6 is external compression spring, and 7 is valve seat, and 8 is lower contact, and 9 is outer positive stop lug boss, and 10 is interior positive stop lug boss, and 11 is axis hole, and 12 is interior
Frustum, 13 is outer frustum, and 14 is flow channels, and 15 is interior compression spring, and 16 is radial direction flowing hole, and 17 to slide boss, and 18 are
Inner core, 19 is seal boss, and 20 is excessively stream chamber, and 21 is radial direction pod apertures, and 22 coordinate boss for sealing, and 23 are shearing outer shroud,
24 to hold out against concave station, and 25 to hold out against outward boss, and 26 is sealing ring, and 27 is that frock blind hole 28 is shear pin, and 29 is ring cavity.
Specific embodiment
This utility model is not limited by following embodiments, can according to the technical solution of the utility model and practical situation come
Determine specific embodiment.
In this utility model, for the ease of description, the description of the relative position relation of each part is according to description
The Butut mode of accompanying drawing 1 being described, such as：The position relationship of forward and backward, upper and lower, left and right etc. is according to Figure of description
Butut direction determining.
This utility model is further described with reference to embodiment and accompanying drawing：
As shown in Figure 1, the machine adopts sand control backwash valve includes top connection 1, outer tube 2, shearing internal ring 3, valve cone 4, support
Cylinder 5, external compression spring 6, valve seat 7 and lower contact 8, the lower outside of top connection 1 and the upper inner sealing fixed installation of outer tube 2
Together, the lower inside of outer tube 2 is fixedly installed togather with the upper outside sealing of lower contact 8, in the lower outside of valve seat 7
Be fixed with outer positive stop lug boss 9, be fixed with interior positive stop lug boss 10 in the lower inside of lower contact 8, the outside of outer positive stop lug boss 9 with it is interior
The upper inner sealing of positive stop lug boss 10 is fixedly installed togather, and 7 axis direction of valve seat is provided with axis hole 11, valve cone 4
On the inside of the outer tube 2 above valve seat 7, interior compression spring 15 is installed between the lower outside and valve seat 7 of valve cone 4, supports
Cylinder 5 and 6 from-inner-to-outer of external compression spring are sequentially arranged on the interior positive stop lug boss 10 and outer positive stop lug boss 9 on the outside of valve cone 4,
Ring cavity 29 is formed between valve cone 4 and support tube 5, the upper inner of valve seat 7 is provided with the interior frustum 12 of taper wide at the top and narrow at the bottom,
The outer frustum 13 that can be held out against with interior frustum 12 is provided with the lower end outside of valve cone 4, between interior frustum 12 and outer frustum 13
Formation can make the flow channels 14 that axis hole 11 is communicated with ring cavity 29, circumferentially have at least one and ring on valve cone 4
The radial direction flowing hole 16 that chamber 29 communicates, is fixed with the outside of the upper end of valve cone 4 and can slide boss with support tube 5 tip contact
17, have distance between boss 17 and support tube 5 sliding, be set between the lower inside for sliding boss 17 and top connection 1
Inner core 18, is fixed with seal boss 19 on the outside of the middle part of inner core 18, and the outside of seal boss 19 is close with the inside middle portion of outer tube 2
Big envelope is fitted together, and excessively stream chamber 20 is formed between seal boss 19 and lower contact 8, with 20 corresponding outer tube of excessively stream chamber
Circumferentially there are at least one radial direction pod apertures 21 communicated with excessively stream chamber 20 on 2, slide between boss 17 and support tube 5
Distance more than the distance between 18 top of inner core and 1 bottom of top connection, shear the shear pin 28 that internal ring 3 is by least one
On the inside of outer tube 2 between seal boss 19 and external compression spring 6.
In washing well process, flushing fluid up can only be crossed pump well-flushing and can not enter down stratum, before holddown is solved the problems, such as
Put, flow channels 14 are closed, flushing fluid is effectively prevented by entering stratum under flow channels 14, so as to avoid due to washing
The formation leakage that well is caused, in addition, eliminating what the mode for taking workover rig oil outlet pump to be cleaned or changed pump was brought
Operating expenses.
Sand control backwash valve can be adopted to above-mentioned machine and is made further optimization and/or improvements according to actual needs：
As shown in Figure 1, the inside middle portion in outer tube 2 is fixed with sealing cooperation boss corresponding with inside and outside seal boss 19
22, the outside of seal boss 19 and sealing coordinate the inner seal of boss 22 to be set in together, and coordinate boss 22 with in sealing
Shearing outer shroud 23 is set between joint 8, internal ring 3 is sheared and is sheared shear pin of 23 from-inner-to-outer of outer shroud by least one
28 are installed together, and shearing internal ring 3 is corresponding about 6 with external compression spring；Or/and, in the bottom of seal boss 19 with shearing
There is spacing between the top of ring 3.On the premise of ensureing to cut off shearing internal ring 3, the setting for shearing outer shroud 23 can be reduced externally
The active force of cylinder 2, improves the stability of this utility model structure.The top of the bottom of seal boss 19 and shearing internal ring 3 it
Between spacing be easy to inner core 18 descending, provide facility for clean-out service.
As shown in Figure 1, the lower end inside in top connection 1 is provided with and holds out against concave station 24, and the upper end of inner core 18 is held out against on top
In tight concave station 24.Holding out against concave station 24 can be such that inner core 18 does not will be shifted up, it is ensured that clean-out service is smoothed out.
As shown in Figure 1, the upper outside in valve cone 4 is fixed with and holds out against boss 25 outward, slides boss 17 and fixes outside
The upper outside of boss 25 is held out against, interior compression spring 15 is installed；Or/and, support tube 5
Seat is on outer positive stop lug boss 9 and interior positive stop lug boss 10 simultaneously.When valve cone 4 is moved down, holding out against outward boss 25 can make intrinsic pressure contracting
15 abundant stress of spring, and interior compression spring 15 can be alleviated be deformed inward.Support tube 5 is while seat is in outer positive stop lug boss
9 and interior positive stop lug boss 10 on, outer positive stop lug boss 9 and interior positive stop lug boss 10 can be made while sharing the active force of support tube 5, so as to
Service life of the present utility model can be extended.
As shown in Figure 1, on the outside of the inner core 18 above the lower end inside and excessively stream chamber 20 of top connection 1 between fixed peace
Equipped with sealing ring 26 at least together, it is installed with least between the inside middle portion of the outside of seal boss 19 and outer tube 2
Sealing ring 26 together, on the inside of the outer tube 2 above the lower outside and radial direction pod apertures 21 of top connection 1 between be installed with
Sealing ring 26 at least together, the lower inside of outer tube 2 be installed between the upper outside of lower contact 8 at least together with
Sealing ring 26, be installed between the outside of outer positive stop lug boss 9 and the upper inner of interior positive stop lug boss 10 at least together with
Sealing ring 26.Sealing ring 26 can improve the sealing property at each sealing.
As needed, the lower outside of top connection 1 is threadably secured with the upper inner of outer tube 2 and is installed together, outward
The lower inside of cylinder 2 is threadably secured with the upper outside of lower contact 8 and is installed together, the outside of outer positive stop lug boss 9 with it is interior
The upper inner of positive stop lug boss 10 is threadably secured and is installed together；Or/and, the top of valve seat 7 is provided with frock blind hole
27；Or/and, the top of top connection 1 is provided with female thread or external screw thread, the bottom of lower contact 8 is provided with female thread or outer
Screw thread.The setting of frock blind hole 27 is easy to dismount valve seat 7.
Above technical characteristic constitutes most preferred embodiment of the present utility model, and which has stronger adaptability and optimal enforcement
Effect, can increase and decrease non-essential technical characteristic according to actual needs, meet the demand of different situations.
The use process of this utility model most preferred embodiment：This utility model is connected in oil pipe string, and pump is connected to this reality
In oil pipe string with new top, when scene needs well-flushing, according to each relevant parameter of depth and stratum of live oil pump,
Determining that annular space pumps into discharge capacity, flushing fluid being pumped into pump truck group, flushing fluid enters radial direction pod apertures 21 from annular space, then to excessively stream chamber
In 20, inner core 18 is descending in the presence of flushing fluid, and inner core 18 pushes down on shearing internal ring 3, when thrust reaches certain value, shearing
Pin 28 is cut off, and then inner core 18 is continued traveling downwardly；During descending, inner core 18 promotes that to slide boss 17 descending to inner core 18,
During valve cone 4 is descending, interior compression spring 15 and external compression spring 6 are compressed, and make interior frustum 12 mutual with outer frustum 13
Hold out against, i.e., flow channels 14 are closed；When the top of inner core 18 is come downwards at excessively stream chamber 20, this utility model and annular space phase
Logical, by radial direction pod apertures 21 in this utility model above valve cone 4, flushing fluid up can only carry out pump to flushing fluid
Well-flushing, solves the problems, such as holddown, and as flow channels 14 are closed, flushing fluid will not enter stratum down；When no longer well-flushing, stop annular space
Flushing fluid is pumped into, at this moment, the external compression spring 6 and interior compression spring 15 of compressive state reset, and valve cone 4 resets, and opens
Circulation road 14, so as to the oil pumping and water filling in later stage, meanwhile, inner core 18 resets, and annular space is in this utility model and is not communicated with state.
Claims (10)
1. a kind of machine adopts sand control backwash valve, it is characterised in that including top connection, outer tube, shearing internal ring, valve cone, support tube, outer
Compression spring, valve seat and lower contact, the lower outside of top connection are fixedly installed togather with the upper inner sealing of outer tube, outer tube
The upper outside sealing of lower inside and lower contact be fixedly installed togather, be fixed with outer limit convex in the lower outside of valve seat
Platform, is fixed with interior positive stop lug boss in the lower inside of lower contact, the upper inner of the outside of outer positive stop lug boss and interior positive stop lug boss
Sealing is fixedly installed togather, and valve seat axis direction is provided with axis hole, and valve cone is located on the inside of the outer tube above valve seat, in valve
Interior compression spring is installed between the lower outside and valve seat of cone, support tube and external compression spring from-inner-to-outer are sequentially arranged on
On interior positive stop lug boss and outer positive stop lug boss on the outside of valve cone, ring cavity is formed between valve cone and support tube, in the upper of valve seat
The interior frustum of taper wide at the top and narrow at the bottom is provided with the inside of portion, the outer cone that can be held out against with interior frustum is provided with the lower end outside of valve cone
Platform, is formed the flow channels that axis hole can be made to be communicated with ring cavity between interior frustum and outer frustum, is circumferentially divided on valve cone
At least one radial direction flowing hole communicated with ring cavity is furnished with, being fixed with the outside of the upper end of valve cone can be with support tube tip contact
Slide boss, have between boss and support tube distance sliding, sliding between boss and the lower inside of top connection be set with
There is inner core, seal boss, the outside of seal boss and the inside middle portion sealing suit of outer tube are fixed with the outside of the middle part of inner core
Together, excessively stream chamber is formed between seal boss and lower contact, on outer tube corresponding with excessively stream chamber circumferentially
Have at least one radial direction pod apertures communicated with excessively stream chamber, slide the distance between boss and support tube more than inner core top with
The distance between top connection bottom, shears internal ring and is arranged on seal boss and external compression spring by least one shear pin
Between outer tube on the inside of.
2. machine according to claim 1 adopts sand control backwash valve, it is characterised in that the inside middle portion of outer tube is fixed with and sealing
Corresponding sealing inside and outside boss coordinates outside and the sealing of boss, seal boss to coordinate the inner seal of boss to be set in together,
Coordinate in sealing and between boss and lower contact, be set with shearing outer shroud, shearing internal ring passes through at least one with shearing outer shroud from-inner-to-outer
Individual shear pin is installed together, and shearing internal ring is corresponding up and down with external compression spring；Or/and, the bottom of seal boss with
There is spacing between the top of shearing internal ring.
3. machine according to claim 1 and 2 adopts sand control backwash valve, it is characterised in that the lower end inside of top connection is provided with top
Tight concave station, the upper end of inner core holds out against and is holding out against in concave station.
4. machine according to claim 1 and 2 adopts sand control backwash valve, it is characterised in that the upper outside of valve cone is fixed with outer
Boss is held out against, boss is slided and is fixed the upper outside for holding out against boss outside, interior compression spring is installed and holds out against boss and valve seat outside
Between；Or/and, support tube is while seat is on outer positive stop lug boss and interior positive stop lug boss.
5. machine according to claim 3 adopts sand control backwash valve, it is characterised in that the upper outside of valve cone is fixed with outer top
Tight boss, slides boss and fixes the upper outside for holding out against boss outside, interior compression spring install hold out against outside boss and valve seat it
Between；Or/and, support tube is while seat is on outer positive stop lug boss and interior positive stop lug boss.
6. the machine according to claim 1 or 2 or 5 adopts sand control backwash valve, it is characterised in that the lower end inside and mistake of top connection
Sealing ring at least together is installed between on the outside of inner core above stream chamber, in the outside of seal boss with outer tube
Sealing ring at least together is installed between on the inside of portion, the outer tube above the lower outside and radial direction pod apertures of top connection
Sealing ring at least together is installed between inner side, fixed peace between the lower inside of outer tube and the upper outside of lower contact
Equipped with sealing ring at least together, be installed between the upper inner of the outside of outer positive stop lug boss and interior positive stop lug boss to
Few sealing ring together.
7. machine according to claim 3 adopts sand control backwash valve, it is characterised in that the lower end inside of top connection and excessively stream chamber
Sealing ring at least together is installed between on the outside of the inner core of top, in the outside of seal boss and the inside middle portion of outer tube
Between be installed with sealing ring at least together, on the inside of the outer tube above lower outside and the radial direction pod apertures of top connection it
Between be installed with sealing ring at least together, be installed between the lower inside of outer tube and the upper outside of lower contact to
Few sealing ring together, be installed between the outside of outer positive stop lug boss and the upper inner of interior positive stop lug boss at least together with
Sealing ring.
8. machine according to claim 4 adopts sand control backwash valve, it is characterised in that the lower end inside of top connection and excessively stream chamber
Sealing ring at least together is installed between on the outside of the inner core of top, in the outside of seal boss and the inside middle portion of outer tube
Between be installed with sealing ring at least together, on the inside of the outer tube above lower outside and the radial direction pod apertures of top connection it
Between be installed with sealing ring at least together, be installed between the lower inside of outer tube and the upper outside of lower contact to
Few sealing ring together, be installed between the outside of outer positive stop lug boss and the upper inner of interior positive stop lug boss at least together with
Sealing ring.
9. the machine according to claim 1 or 2 or 5 or 7 or 8 adopts sand control backwash valve, it is characterised in that outside the bottom of top connection
Side is threadably secured with the upper inner of outer tube and is installed together, and the lower inside of outer tube is passed through with the upper outside of lower contact
It is screwed and is installed together, the outside of outer positive stop lug boss is threadably secured installed in one with the upper inner of interior positive stop lug boss
Rise；Or/and, the top of valve seat is provided with frock blind hole；Or/and, the top of top connection is provided with female thread or external screw thread,
The bottom of lower contact is provided with female thread or external screw thread.
10. machine according to claim 6 adopts sand control backwash valve, it is characterised in that the lower outside of top connection is upper with outer tube
It is threadably secured on the inside of portion and is installed together, the lower inside of outer tube is threadably secured installation with the upper outside of lower contact
Together, the outside of outer positive stop lug boss is threadably secured with the upper inner of interior positive stop lug boss and is installed together；Or/and,
The top of valve seat is provided with frock blind hole；Or/and, the top of top connection is provided with female thread or external screw thread, in lower contact
Bottom is provided with female thread or external screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621112935.XU CN206129201U (en) | 2016-10-11 | 2016-10-11 | Sand control backwashing valve is adopted to machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621112935.XU CN206129201U (en) | 2016-10-11 | 2016-10-11 | Sand control backwashing valve is adopted to machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206129201U true CN206129201U (en) | 2017-04-26 |
Family
ID=58572198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621112935.XU Expired - Fee Related CN206129201U (en) | 2016-10-11 | 2016-10-11 | Sand control backwashing valve is adopted to machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206129201U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464076A (en) * | 2021-07-21 | 2021-10-01 | 深圳景嘉机电科技有限公司 | Oil-submersible pump well flushing valve and well flushing method |
-
2016
- 2016-10-11 CN CN201621112935.XU patent/CN206129201U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113464076A (en) * | 2021-07-21 | 2021-10-01 | 深圳景嘉机电科技有限公司 | Oil-submersible pump well flushing valve and well flushing method |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20170426 Termination date: 20201011 |