CN207960573U - Cylindrical pressure return valve - Google Patents
Cylindrical pressure return valve Download PDFInfo
- Publication number
- CN207960573U CN207960573U CN201820265908.9U CN201820265908U CN207960573U CN 207960573 U CN207960573 U CN 207960573U CN 201820265908 U CN201820265908 U CN 201820265908U CN 207960573 U CN207960573 U CN 207960573U
- Authority
- CN
- China
- Prior art keywords
- valve
- assembling stand
- tubular spool
- pressure return
- cylindrical pressure
- 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.)
- Withdrawn - After Issue
Links
- 238000007789 sealing Methods 0.000 claims description 23
- 230000006978 adaptation Effects 0.000 claims description 5
- 238000010009 beating Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 11
- 238000005553 drilling Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 241001074085 Scophthalmus aquosus Species 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Safety Valves (AREA)
Abstract
The utility model discloses a kind of cylindrical pressure return valves,The cylindrical pressure return valve includes that inner cavity is equipped with valve seat,The valve body of tubular spool and direction set,One end that tubular spool is located at direction set is assemblied in direction by assembling structure and puts on,Assembling structure includes that the guide post on tubular spool covers upper pilot hole with direction is opened in,Being arranged in pilot hole can be along the assembling stand of valve body axial direction way moving,Guide post is set in assembling stand can be along valve body axial direction way moving,Assembling stand and direction inner room are provided with elastic component and provide elastic force towards valve seat for assembling stand,By opening up guide groove and oblique limiting slot on assembling stand,The double wedge in pilot hole is coordinated to realize the locking and release of assembling stand position,To realize the normally opened and normally closed control of valve,The cylindrical pressure return valve is simple,It is ingenious,Have the advantages that reliability is high,In the presence of cleverly solving the problems, such as 201120184474.8 schemes of ZL.
Description
Technical field
The utility model is related to a kind of drill and petroleum extraction tools, especially a kind of tubular back pressure preventing drilling process gas blowout accident
Valve.
Background technology
In each task of oil exploration and oil field development, drilling well plays a very important role, but in drilling
In engineering, phenomena such as being frequently encountered well kick, blowout.When strata pressure is more than mud liquid column hydrostatic pressure, strata pressure very may be used
Mud can be pushed to be sprayed upwards along drill string hydrophthalmia, rotary hose may be sprained bad because of high pressure, and be likely occurred serious well
Spray accident needs a large amount of mud to be pressurized at this time so that rig floor becomes in disorder, and the oil of underground sprays, and causes ring
The pollution in border.
When finding well kick, blowout sign, carry out closing well and kill-job operation rapidly and efficiently are to effectively reduce gas blowout accident
Important guarantee.And the check-valves on drill string is the effective tool of drilling pipe internal prevention.Conventional drilling tool check valve in the past
Including arrow-shaped check valve, ball check valve, drop-in check valve, butterfly shaped check valve etc., there are the following problems for these check-valves：1、
Channel area of passage is less than normal, is easy to block, influences drillng operation；2, Choking phenomenon is easy tod produce, rushing for check-valves part is accelerated
Usage time is shortened in erosion.
Traditional check-valves has not adapted to the requirement of drilling safety, needs to design a new back-pressure valve, it is ensured that rises
Overflow not easy to produce when brill；Grouting is not easy to plug when special operation；It is not likely to produce throttling, internal part erosion reduces, and sealing can
It leans on, service life is long.
In order to solve these problems, Chinese patent ZL 201120184474.8 provides a kind of cylindrical pressure return valve.The tubular
Back-pressure valve includes valve body, and the inner cavity of valve body is equipped with valve seat and direction set, and tubular spool is located between valve seat and direction set, tubular
Spool is to be oriented to direction set, realizes its function.
But in the schemes that are provided of ZL 201120184474.8, tubular spool is located in its whole shift motion
In free state, during blowout occurs, Fluid pressure can not in time move up tubular spool to realize instant closing function
Probability be existing to a certain extent, so as to cause accident that cannot be taken precautions against in time.
Invention content
The goal of the invention of the utility model is：In view of the above problems, a kind of cylindrical pressure return valve structure is provided to set
Meter is to realize its function of closing immediately.
The technical solution adopted in the utility model is as follows：
Cylindrical pressure return valve, including valve body, the inner cavity of the valve body are equipped with valve seat and direction set, tubular spool be located at valve seat with
Between the set of direction, which is located at one end that direction covers and is assemblied in direction by assembling structure and puts on and make tubular spool can edge
Valve body axial direction way moving and the opening and closing for realizing cylindrical pressure return valve；The assembling structure includes the guide post on tubular spool
Upper pilot hole is covered with direction is opened in, being arranged in the pilot hole can be along the assembling stand of valve body axial direction way moving, guide post
Being set in assembling stand can be along valve body axial direction way moving and by the assembly of tubular spool on the set of direction, assembling stand and direction inner room
It is provided with elastic component and elastic force towards valve seat is provided for assembling stand；A guiding in an axial direction is offered on the assembling stand
Slot, and with the guide groove middle section position unicom and the oblique limiting slot of direction set, be provided with double wedge on the pilot hole, fill
With double wedge is located at guide groove, oblique limiting slot is formed by space after seat and pilot hole assembly；When double wedge is located at oblique limit
When in slot, assembling stand position is locked by the elastic force of elastic component, assembling stand has spacing with valve base chamber and makes tubular at this time
Spool has the opening and closing that cylindrical pressure return valve is realized in two-way free-moving space；When double wedge is located in guide groove, dress
Tubular spool, which is pressed together on valve seat, by the elastic force of elastic component with seat makes cylindrical pressure return valve close.
Further, which is the compressed spring for being set in assembling stand and direction inner room.
Further, the valve seat is along the ring Zhou Kaishe sealing element mounting grooves of its inner ring, the interior setting sealing of sealing element mounting groove
The sealing surface of part, the sealing element and tubular spool cooperatively forms sealing.
Further, the direction puts on the through hole at least offered towards body cavity wall.
Further, the direction puts on the through hole at least offered towards tubular spool.
Further, the diameter of the tubular spool put on not less than direction covered towards tubular spool through hole it is straight
Diameter.
Further, the tubular spool has the cylindrical part being adapted to valve seat bore positioned at one end of valve seat, and passes through
Tubular valve core housing is set in valve seat by the cylindrical part, and through hole is opened up on the wall of the cylindrical part.
Further, the seal section of the tubular spool is pyramid type structure.
Further, the face for being in contact with assembling stand of the tubular spool, is the annular groove being adapted to assembling stand
Structure
Further, the valve body, valve seat tubular spool, assembling stand, direction cover the coaxial heart.
In conclusion by adopting the above-described technical solution, the utility model has the beneficial effects that：
1, the assembling structure used, double wedge is located in guide groove cylindrical pressure return valve in use, and assembling stand passes through bullet
Property part elastic force tubular spool can be pressed together on valve seat make cylindrical pressure return valve be in normally off, overcome ZL
201120184474.8 tubular spools are in free state in its all shift motion, and blowout process medium fluid is occurring
Pressure can not in time move up tubular spool to realize the problem of probability of instant closing function exists to a certain extent；
2, the assembling structure used, in going down process, double wedge is located in oblique limiting slot cylindrical pressure return valve, utilizes elasticity
The elastic force of part locks assembling stand position, and assembling stand makes tubular spool be moved freely with two-way with valve base chamber with spacing
Space realize that cylindrical pressure return valve freely opens and closes, it is practical it is lower bore in tubular spool utilize gravity realization cylindrical pressure return valve
Opening, be in normally off compared to directly valve seat is fitted in by unitary elasticity power using tubular spool, this, which is designed with, is conducive to
Improve the lower efficiency bored；
3, the assembling structure used is disposed on direction set and tubular spool, will not be to structure design of valve body itself
Or intensity impacts, while the assembling structure is simple, ingenious, has the advantages that reliability is high.
Description of the drawings
The utility model will illustrate by example and with reference to the appended drawing, wherein：
Fig. 1 be the utility model cylindrical pressure return valve structure under normally open schematic diagram；
Fig. 2 be the utility model cylindrical pressure return valve structure under closed schematic diagram by fluid force under normally open；
Fig. 3 be the utility model cylindrical pressure return valve structure under normally off schematic diagram；
Fig. 4 be the utility model cylindrical pressure return valve in direction nested structure schematic diagram；
Fig. 5 be the utility model cylindrical pressure return valve in assembling stand structural schematic diagram；
Fig. 6 be the utility model cylindrical pressure return valve in direction set, assembling stand dress match relation schematic diagram.
It is marked in figure：1- valve bodies, 2- pressure caps, 3- valve seats, 4- sealing elements, 5- sealing elements, 6- tubulars spool, 61- seal sections,
62- through holes, 63- guide posts, 64- cylindrical parts, 7- assembling stands, 71- guide grooves, the oblique limiting slots of 72-, 8- elastic components, the side 9-
To set, 91- through holes, 92- through holes, 93- pilot holes, 94- double wedges.
Specific implementation mode
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
.
Embodiment
The cylindrical pressure return valve of the utility model, structure are as follows：
There are one valve bodies 1 for tool.The valve body 1 is in an axial direction（Centerline direction in Fig. 1, Fig. 2, Fig. 3）It is upper have inner cavity with
Assembly in internal component and formation circulation passage.The both ends of valve body 1 have the pin end and female connector for connection.
There are one the valve seats 3 being closing and sealing off for cylindrical pressure return valve for tool.The valve seat 3 be loop configuration, the valve seat 3 it is close
Cover is the small pyramid type face of outer imperial palace, and a sealing element mounting groove along ring week, sealing element installation are offered on the sealing surface
Sealing element 5 is set in slot.
There are one tubular spools 6 for tool.The stage casing of the tubular spool 6 is seal section 61, and seal section 61 is pyramid type structure, shape
At the sealing surface with the cooperation of the sealing surface of valve seat 3.In the axial direction of tubular spool 6, there are one be adapted to one end tool with 3 internal diameter of valve seat
Cylindrical part 64, offer on the wall of the cylindrical part 64 for fluid by through hole 62, there are one cylindrical for other end tool
Guide post 63, the diameter of guide post 63 is less than the diameter of seal section 61.In the tubular spool 6, seal section 61, guide post 63,
64 coaxial line of cylindrical part.
There are one assembling stands 7 for tool.The assembling stand 7 is columnar structure, and internal diameter is adapted to guide post 63, outer diameter and side
To 93 internal diameter of the pilot hole adaptation of set 9.The one end outer diameter of assembling stand 7 is bigger, is limited for the installation of elastic component 8.Assembly
A guide groove 71 in an axial direction is offered on seat 7, guide groove 71 is terminal in the bigger end of the outer diameter of assembling stand 7, and is passed through
The other end of assembling stand 7 is passed to, and simultaneously direction covers 9 with the 71 middle section position unicom of guide groove（After installation）（Either
End is penetrated through towards guide groove 71）Oblique limiting slot 72.Its structure is as shown in Figure 5.
There are one directions to cover 9 for tool.Direction set 9 is with the columnar structured of end, is provided on the axle center of end
The round pilot hole 93 that internal diameter is adapted to assembling stand outer diameter is provided with double wedge 94 on the internal diameter of the pilot hole 93, the double wedge 94 with
The width adaptation of guide groove 71, oblique limiting slot 72.Direction set 9 on offer for fluid by through hole.Through hole
Including at least the through hole 91 towards 1 internal chamber wall of valve body for covering 9 end sidewalls close to direction.Alternatively, covering 9 including at least in direction
The through hole 92 towards tubular spool 6 opened up on end.Its structure is as shown in Figure 4.
The assembly relation of each component is as shown in Figure 1.Assembly direction covers 9, tubular spool 6 and valve seat successively for the inner cavity of valve body 1
3.The end of direction set 9 is connect with the internal thread of 1 inner cavity of valve body by external screw thread.Valve seat 3 will be each by the pressure cap 2 on the outside of it
Component fixing assembling is in valve body 1.Assembly is sealed by sealing element 4 between 1 inner cavity of valve seat 3 and valve body.
Tubular spool 6 is located between valve seat 3 and direction set 9, and one end that tubular spool 6 is located at direction set passes through assembling structure
It is assemblied on direction set 9, the cylindrical part 64 of the other end is set in valve seat 3 and pressure cap 2 is formed by space, makes tubular spool 6
The opening and closing of cylindrical pressure return valve can be realized along valve body axial direction way moving.
The assembling structure includes the pilot hole 93 in guide post 63 and direction set 9 on tubular spool 6.Assembling stand 7 is arranged
In the pilot hole 93, the double wedge 94 of pilot hole 93 is located at guide groove 71 after assembly, oblique limiting slot 72 is formed by space,
The structure of 9 axial way movings can be covered in direction by forming assembling stand 7, as shown in Figure 6.The guide post 63 of tubular spool 6 is set in
It, can be in assembling stand 7 in assembling stand 7（Along valve body axial direction）Interior way moving.It is provided with elastic component 8 between assembling stand 7 and direction set 9
The elastic force towards valve seat 3 is provided for assembling stand 7, the installation by the bigger end of 7 outer diameter of assembling stand for elastic component 8 limits
Position.
After assembly, valve body 1, valve seat 3, tubular spool 6, assembling stand 7, direction set 9 are the coaxial hearts.
After assembly, when double wedge 94 is located in oblique limiting slot 72, by the elastic force of elastic component 8 by 7 position of assembling stand
Locking makes tubular spool 6 realize tubular with two-way free-moving space with spacing at this time between assembling stand 7 and valve seat 3
The opening and closing of back-pressure valve.Structure such as Fig. 1 opens signal, Fig. 2 closes signal.
In use, when double wedge 94 is located in guide groove 71, assembling stand 7 is by the elastic force of elastic component 8 by tubular spool 6
Being pressed together on valve seat 3 makes cylindrical pressure return valve close, as shown in Figure 3.
Preferably it is set in the specific choice of elastic component 8 in another embodiment based on above structure
The compressed spring being located between assembling stand 7 and direction set 9.
Based on above structure, in another embodiment, 61 diameter of seal section of tubular spool 6 is not less than direction
The diameter covered towards tubular spool through hole 92 on set 9 so that provide maximum direct fluid stress surface for tubular spool 6
Product.
Based on above structure, in another embodiment, the tubular spool 6 for being in contact with assembling stand
Face is the circular groove structure being adapted to assembling stand 7, is installed for the adaptation of assembling stand 7, ensures reliability.
The cylindrical pressure return valve of the utility model, when use：
In original state, as shown in Figure 1, double wedge 94 is located in oblique limiting slot 72, and will by the elastic force of elastic component 8
7 position of assembling stand locks, and tubular spool 6 is in normally open by gravity.In normal going down process, tubular spool 6 is because of gravity
In normally open, spool top is entered by the runner in valve body when the liquid of spool lower part is moved down with cylindrical pressure return valve, it is real
Now from the function of grouting.
When blowout or well kick occurs such as shaft bottom in normal going down process, spool lower liquid pressure pushes spool to move up pass
Valve closing body realizes the function of preventing blowout or well kick, as shown in Figure 2.When blowout or and gush releasing after above carry drilling tool, spool restores
Normally open makes grouting channel open, and realizes lower bore from being in the milk, as shown in Figure 1.
When cylindrical pressure return valve, which is transferred to, requires well depth, by drilling tool water hole, grouting is pressurizeed at the top of drilling tool, and spool is born
It is moved down from the pressure on top, then makes that assembling stand moves down and compression elastic piece, double wedge 94 are exited out of oblique limiting slot 72
And enter guide groove 71, limit is released, discharges the elastic force of elastic component, spool is pressed together on valve seat by assembling stand under elastic force
So that cylindrical pressure return valve is closed, back-pressure valve is in normal status at this time, carry out it is normal bore and operation is, it can be achieved that interior blowout prevention function, such as
Shown in Fig. 3.
In the utility model cylindrical pressure return valve, the assembling structure of use, double wedge is located at cylindrical pressure return valve in use
In guide groove, tubular spool can be pressed together on valve seat by assembling stand by the elastic force of elastic component makes cylindrical pressure return valve be in normally closed shape
State overcomes 201120184474.8 tubular spools of ZL and is in free state in its all shift motion, and well is occurring
Fluid pressure can not in time move up tubular spool to realize that the probability of instant closing function is deposited to a certain extent in spray process
The problem of；In addition, cylindrical pressure return valve, in going down process, double wedge is located in oblique limiting slot, utilizes the elastic force of elastic component
Assembling stand position is locked, assembling stand makes tubular spool be realized with two-way free-moving space with valve base chamber with spacing
Cylindrical pressure return valve freely opens and closes, and tubular spool realizes the opening of cylindrical pressure return valve, phase using gravity in practical lower brill
Than in directly being fitted in valve seat in normally off by unitary elasticity power using tubular spool, this is designed with to improve lower brill
Efficiency；Meanwhile the assembling structure of use, it is disposed on direction set and tubular spool, it will not be to structure design of valve body itself
Or intensity impacts, while the assembling structure is simple, ingenious, has the advantages that reliability is high.
The utility model is not limited to specific implementation mode above-mentioned.The utility model expands to any in this specification
The new feature of middle disclosure or any new combination, and disclose any new method or process the step of or any new group
It closes.
Claims (10)
1. cylindrical pressure return valve, it is characterised in that：Including valve body（1）, the valve body（1）Inner cavity be equipped with valve seat（3）It is covered with direction
（9）, tubular spool（6）Positioned at valve seat（3）It is covered with direction（9）Between, the tubular spool（6）Pass through dress positioned at one end of direction set
Distribution structure is assemblied in direction set（9）On make tubular spool（6）Beating for cylindrical pressure return valve can be realized along valve body axial direction way moving
It is open and close；
The assembling structure includes tubular spool（6）On guide post（63）It is covered with direction is opened in（9）On pilot hole（93）, should
Pilot hole（93）Inside being arranged with can be along the assembling stand of valve body axial direction way moving（7）, guide post（63）It is set in assembling stand（7）It is interior
It can be along valve body axial direction way moving and by tubular spool（6）It is assemblied in direction set（9）On, assembling stand（7）It is covered with direction（9）Between set
It is equipped with elastic component（8）For assembling stand（7）It provides towards valve seat（3）Elastic force；
In the assembling stand（7）On offer a guide groove in an axial direction（71）, and with the guide groove（71）Middle section position joins
Logical and direction set（9）Oblique limiting slot（72）, the pilot hole（93）On be provided with double wedge（94）, assembling stand（7）With dress
Distribution（93）Double wedge after assembly（94）Positioned at guide groove（71）, oblique limiting slot（72）It is formed by space；
Work as double wedge（94）Positioned at oblique limiting slot（72）When interior, pass through elastic component（8）Elastic force by assembling stand（7）It locks position
Determine, at this time assembling stand（7）With valve seat（3）Between have spacing and make tubular spool（6）It is realized with two-way free-moving space
The opening and closing of cylindrical pressure return valve；
Work as double wedge（94）Positioned at guide groove（71）When interior, assembling stand（7）Pass through elastic component（8）Elastic force by tubular spool（6）
It is pressed together on valve seat（3）On so that cylindrical pressure return valve is closed.
2. cylindrical pressure return valve as described in claim 1, it is characterised in that：The elastic component（8）To be set in assembling stand（7）With side
To set（9）Between compressed spring.
3. cylindrical pressure return valve as described in claim 1, it is characterised in that：The valve seat（3）Along the ring Zhou Kaishe sealings of its inner ring
Part mounting groove, sealing element mounting groove is interior to be arranged sealing element（5）, the sealing element（5）With tubular spool（6）Sealing surface cooperatively form
Sealing.
4. cylindrical pressure return valve as described in claim 1, it is characterised in that：Direction set（9）On at least offer towards valve body
（1）The through hole of internal chamber wall（91）.
5. cylindrical pressure return valve as described in claim 1, it is characterised in that：Direction set（9）On at least offer towards tubular
Spool（6）Through hole（92）.
6. cylindrical pressure return valve as claimed in claim 5, it is characterised in that：The tubular spool（6）Diameter not less than direction cover
（9）On towards tubular spool through hole（92）The diameter covered.
7. cylindrical pressure return valve as described in claim 1, it is characterised in that：The tubular spool（6）Positioned at valve seat one end have
Have and valve seat（3）The cylindrical part of internal diameter adaptation（64）, and pass through the cylindrical part（64）By tubular spool（6）It is sheathed on valve seat（3）
It is interior, the cylindrical part（64）Wall on open up through hole（62）.
8. cylindrical pressure return valve as described in claim 1, it is characterised in that：The tubular spool（6）Seal section（61）For circular cone
Type structure.
9. cylindrical pressure return valve as described in claim 1, it is characterised in that：The tubular spool（6）For connecting with assembling stand
Tactile face is and assembling stand（7）The circular groove structure of adaptation.
10. cylindrical pressure return valve as described in claim 1, it is characterised in that：The valve body（1）, valve seat（3）Tubular spool（6）, dress
With seat（7）, direction set（9）The coaxial heart.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820265908.9U CN207960573U (en) | 2018-02-24 | 2018-02-24 | Cylindrical pressure return valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820265908.9U CN207960573U (en) | 2018-02-24 | 2018-02-24 | Cylindrical pressure return valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207960573U true CN207960573U (en) | 2018-10-12 |
Family
ID=63739910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820265908.9U Withdrawn - After Issue CN207960573U (en) | 2018-02-24 | 2018-02-24 | Cylindrical pressure return valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207960573U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195574A (en) * | 2018-02-24 | 2019-09-03 | 广汉川油井控装备有限公司 | Cylindrical pressure return valve |
| CN110439505A (en) * | 2019-08-13 | 2019-11-12 | 广汉川油井控装备有限公司 | A kind of novel cartridge type back-pressure valve |
-
2018
- 2018-02-24 CN CN201820265908.9U patent/CN207960573U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195574A (en) * | 2018-02-24 | 2019-09-03 | 广汉川油井控装备有限公司 | Cylindrical pressure return valve |
| CN110195574B (en) * | 2018-02-24 | 2024-02-13 | 广汉川油井控装备有限公司 | Cylindrical back pressure valve |
| CN110439505A (en) * | 2019-08-13 | 2019-11-12 | 广汉川油井控装备有限公司 | A kind of novel cartridge type back-pressure valve |
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|---|---|---|---|
| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20240213 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181012 Effective date of abandoning: 20240213 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |