CN202789460U - Gas-proof oil well pump - Google Patents
Gas-proof oil well pump Download PDFInfo
- Publication number
- CN202789460U CN202789460U CN 201220328394 CN201220328394U CN202789460U CN 202789460 U CN202789460 U CN 202789460U CN 201220328394 CN201220328394 CN 201220328394 CN 201220328394 U CN201220328394 U CN 201220328394U CN 202789460 U CN202789460 U CN 202789460U
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- Prior art keywords
- plunger
- pump
- valve
- valve seat
- pull rod
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000003129 oil well Substances 0.000 title claims abstract description 36
- 239000010779 crude oil Substances 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 20
- 239000007789 gas Substances 0.000 description 15
- 238000003825 pressing Methods 0.000 description 9
- 238000005086 pumping Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model relates to an air-proof oil well pump, which is provided with a pump cylinder, wherein two ends of the pump cylinder are respectively connected with a lifting short circuit and a fixed valve; the plunger is arranged in the pump cylinder and can move along the axial direction of the pump cylinder; a pull rod stretches into in promotion short circuit and the plunger, a dish valve cover can move ground cover establish on the pull rod to be located plunger upper portion, a traveling valve sets up the lower extreme of plunger and with position pole lower extreme fixed connection. The utility model discloses during the exchange of upper and lower stroke, the traveling valve can seal rapidly or open the bottom of plunger, has overcome among the known art because of the influence of the airlock phenomenon of the gaseous production in the oil-well pump to the oil-well pump effect. And the butterfly valve is not fixedly connected with the pull rod, so that the problem of overlarge impact load on the pull rod and the sucker rod in the exchange process of the lower stroke and the upper stroke is solved, the probability of breaking off the sucker rod is reduced, and the normal production of crude oil is ensured.
Description
Technical Field
The utility model relates to an oil-well pump especially relates to a prevent gas oil-well pump, and it can avoid the problem of opening because of the lower journey time delay that leads to in the pump barrel to can prevent the impact of load to the sucker rod effectively.
Background
With the increase of the development time of the oil field, the energy of the stratum is continuously consumed, so that the effect of extracting crude oil by natural energy is poorer and poorer. The oil has to be produced by artificially increasing the energy of the formation. Wherein, the application effect of the traditional nitrogen injection, carbon dioxide injection and the thickened oil air injection catalytic oxidation oil extraction technology developed in recent years in the oil extraction field is more ideal, so that the application range of the technology is wider and wider. However, the negative effect is more and more obvious, especially along with the increasing of the gas (steam) injection quantity, the gas (steam) body has more and more great influence on the oil pumping efficiency of the oil well pump, and the phenomenon of air lock often appears in the oil pumping process, namely, due to the existence of gas in the pump barrel, the traveling valve at the lower part of the oil well pump can generate the phenomenon of delayed opening, and the working efficiency of the oil well pump is seriously influenced. In addition, because the oil quantity produced by the oil well pump is very large, when the oil well pump works at the lower dead point and the upper dead point, the impact load acting on the sucker rod is large, and the sucker rod is easy to break and drop. Therefore, the daily maintenance workload in the crude oil production is increased, and the unit crude oil cost is continuously increased.
In view of the above-mentioned defects of the known technology, the present designer develops the gas-proof oil well pump according to the production design experience of many years in this field and the related field, so as to improve the oil pumping efficiency of the oil well pump, reduce the maintenance and reduce the production cost.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prevent gas oil-well pump, it can enough avoid the problem of opening because of the lower journey time delay that gas leads to in the pump barrel, can prevent the impact of load to the sucker rod again effectively.
Therefore, the utility model provides an air-proof oil well pump, which is provided with a pump cylinder, wherein two ends of the pump cylinder are respectively connected with a lifting short circuit and a fixed valve; the plunger is arranged in the pump cylinder and can move along the axial direction of the pump cylinder; a pull rod stretches into in promotion short circuit and the plunger, a dish valve cover can move ground cover establish on the pull rod to be located plunger upper portion, a traveling valve sets up the lower extreme of plunger and with position pole lower extreme fixed connection.
The air-tight oil well pump is characterized in that a disc-shaped valve cover and a disc-shaped valve seat are arranged in the lifting short circuit, and the disc-shaped valve is located between the disc-shaped valve cover and the disc-shaped valve seat.
The gas-proof oil well pump is characterized in that a plurality of axial through holes are formed in the butterfly valve cover, and the butterfly valve can seal the through holes.
The air-tight oil well pump is characterized in that the pull rod is further sleeved with a plunger pressing ring, the plunger pressing ring is arranged on the lower portion of the disc-shaped valve seat and located on the upper portion of the plunger, and the plunger can be sealed.
The air-proof oil well pump is characterized in that the butterfly valve cover and the butterfly valve seat are in threaded connection with the lifting short joint.
The gas-tight oil pump as described above, wherein the fixed valve includes a fixed valve seat body connected to the pump cylinder, a fixed valve seat provided at a lower portion of the fixed valve seat body, a fixed valve ball capable of seating on the fixed valve seat, and a fixed valve cover provided in the fixed valve seat body and positioned above the fixed valve ball.
The air-proof oil well pump has the advantages that the upper end of the pull rod forms a boss which can be connected with the sucker rod disconnecting and connecting device.
The air-proof oil well pump is characterized in that the upper part of the lifting short joint is connected with the upper joint.
The air-proof oil well pump is characterized in that the lifting short joint, the pump cylinder and the fixed valve are in threaded connection.
The gas-proof oil well pump is characterized in that the fixed valve cover and the fixed valve seat are respectively in threaded connection with the fixed valve seat body.
Compared with the prior art, the utility model has the characteristics and advantages that:
the utility model discloses a gas-proof function that oil-well pump had lies in its pull rod fixed connection's mechanical open-type traveling valve can avoid "airlock". The butterfly valve is closed under the action of gravity and the downward thrust of the pull rod during the downward stroke, so that the traveling valve is opened in time; the mechanical opening type traveling valve is driven by the pull rod, can be closed in time during the upper stroke, reduces the leakage amount of the traveling valve, and can be opened in time and forcibly during the lower stroke, thereby avoiding the phenomenon that the traveling valve of the common pump is opened in a delayed manner due to the compression of gas during the lower stroke, reducing the occurrence of the phenomena of 'air lock' and 'steam lock', and improving the pumping efficiency of the oil well pump. The air-proof structure of the mechanical opening type traveling valve is used, so that the air-proof effect is improved; because the butterfly valve and the pull rod are in sleeve joint and not fixedly connected, when the lower dead point and the upper dead point of the sucker rod are converted, the weight of a liquid column on the butterfly valve acts on the butterfly valve, and the butterfly valve is seated on a butterfly valve seat fixed on a pump cylinder and transmits the weight to the pump cylinder, so that the load of the sucker rod is reduced, the adverse effect of impact load on the sucker rod is greatly reduced, and the probability of breaking the sucker rod is greatly reduced.
Drawings
The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein,
fig. 1 is a schematic structural view of the air-tight oil pump of the present invention, showing an initial state of an upstroke;
fig. 2 is an upper stroke intermediate state of the gas-proof oil well pump of the present invention;
fig. 3 shows the upper stroke end state of the gas-proof oil well pump of the present invention;
fig. 4 shows the starting state of the down stroke of the gas-proof oil pump of the present invention;
FIG. 5 shows the middle status of the down stroke of the gas-proof oil pump of the present invention;
fig. 6 shows the end of the down stroke of the gas-proof oil pump of the present invention.
The reference numbers illustrate:
1. pull rod 2, upper joint 3, butterfly valve cover 31 and through hole
4. Butterfly valve 5, sealing ring 6, lifting short circuit 7 and butterfly valve seat
8. Plunger pressing ring 9, pump cylinder 10, plunger 11 and traveling valve
12. Fixed valve 121, fixed valve seat body 122, fixed valve cover 123, fixed valve ball
124. Fixed valve seat
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the airtight oil pump of the present invention.
As shown in fig. 1, the utility model provides a prevent that gas oil-well pump has pump barrel 9, the both ends of pump barrel 9 are connected with promotion short circuit 6 and standing valve 12 respectively. A plunger 10 is disposed within the pump barrel 9 and is axially movable along the pump barrel 9. A pull rod 1 stretches into in promoting short circuit 6 and the plunger 10, a butterfly valve 4 can the ground cover with removing on the pull rod 1 to be located plunger 10 upper portion, a traveling valve 11 sets up the lower extreme of plunger 10 and with position pole 1 lower tip fixed connection.
Because the butterfly valve 4 is sleeved on the pull rod 1 and the traveling valve 11 is fixed at the bottom of the pull rod 1, the traveling valve 11 can rapidly close the bottom of the plunger 10 during the up stroke, and the traveling valve 11 can rapidly open the bottom of the plunger 10 during the down stroke, thereby overcoming the influence of the air lock phenomenon generated by gas in the oil well pump on the pumping efficiency of the oil well pump in the prior art. And the butterfly valve 4 is non-fixedly connected with the pull rod 1, so that the problem of overlarge impact load on the pull rod and the sucker rod in the exchange process of the down stroke and the up stroke in the prior art is effectively solved, the probability of breaking off the sucker rod is reduced, and the normal production of crude oil is further ensured.
Further, a butterfly valve cover 3 and a butterfly valve seat 7 are arranged in the lifting short circuit 6, and the butterfly valve 4 is located between the butterfly valve cover 3 and the butterfly valve seat 7.
Furthermore, a plurality of axial through-holes 31 are provided in the disk valve housing 3, and the disk valve 4 can close the through-holes 31.
One feasible embodiment is that a plunger pressing ring 8 is further sleeved on the pull rod 1, the plunger pressing ring 8 is arranged on the lower portion of the disk-shaped valve seat 7 and located on the upper portion of the plunger 10, and the plunger 10 can be sealed.
Further, the fixed valve 12 includes a fixed valve seat body 121 connected to the pump cylinder 9, a fixed valve seat 124 provided at a lower portion of the fixed valve seat body 121, a fixed valve ball 123 capable of being seated on the fixed valve seat 124, and a fixed valve cover 122 provided in the fixed valve seat body 121 and located at a portion of the fixed valve ball 123.
In order to prevent the pull rod 1 from being easily separated from the sucker rod, a lug boss capable of being connected with a disconnecting device of the sucker rod is formed at the upper end of the pull rod 1.
Furthermore, the upper part of the lifting sub 6 is connected to the upper connection 2.
In a specific embodiment, the lifting sub 6, the pump barrel 9 and the fixed valve 12 are connected by screw threads.
The butterfly valve cover 3 and the butterfly valve seat 7, the fixed valve cover 122 and the fixed valve seat 124 are respectively in threaded connection with the lifting short circuit 6 and the fixed valve seat body 121 of the fixed valve 12.
The structure and the working principle of the airtight oil pump of the present invention will be further described with reference to a specific embodiment. As shown in fig. 1, the upper end of the drawbar 1 may be forged to form a boss having an outer diameter larger than that of the body of the drawbar in order to be firmly coupled to the sucker rod coupling and the lower end of the drawbar 1 is externally threaded to be coupled to the traveling valve 11. The upper end and the lower end of an upper joint 2 arranged on the upper part of the lifting short joint 6 are provided with internal threads, the upper end of the upper joint is convenient for connecting an oil pipe, and the lower end of the upper joint is in threaded connection with the lifting short joint 6. Promote the lower extreme of short circuit 6 and pass through threaded connection with pump barrel 9 upper ends, promote the inside internal thread that has all turned over of the upper and lower end of short circuit 6. Butterfly valve bonnet 3 promotes the inside part on the upper side of short circuit 6 through threaded connection, and butterfly valve seat 7 passes through threaded connection and promotes the 6 latter half of short circuit, and the butterfly valve 4 of establishing on pull rod 1 is located between butterfly valve seat 7 and the butterfly valve bonnet 3, just butterfly valve 4 is equipped with O shape sealing washer 5 with 1 contact site of pull rod. The upper and lower parts of the pump barrel 9 are both provided with external threads, the upper part of the pump barrel is in threaded connection with the lifting short joint 6, and the lower part of the pump barrel is in threaded connection with the fixed valve seat body 121. The fixed valve cover 122 is screwed into the fixed valve seat body 121, and the fixed valve seat 124 is screwed into a lower portion of the fixed valve seat body 121. A fixed valve ball 123 is disposed between the fixed valve cover 122 and the fixed valve seat 124. The lower portion of the fixed valve seat body 121 is externally threaded to facilitate connection to other downhole tools. The plunger 10 is sleeved on the pull rod 1, can be movably arranged in the pump cylinder up and down, and is positioned between the disk valve seat 7 and the traveling valve 11. Still be equipped with plunger clamping ring 8 on pull rod 1, this plunger clamping ring 8 is located between disk valve seat 7 and plunger 10 upper portion, and it mainly plays the gap outflow between crude oil follow travelling valve and the plunger in the reduction upstroke process to reduce the inside pressure of plunger in the upstroke process.
Referring to fig. 2 to 6, after the oil well is pumped, the pull rod 1 moves upward to drive the components sleeved thereon to move upward during the upward stroke, and when the pull rod 1 drives the traveling valve 11 to move upward, the traveling valve 11 rapidly abuts against the lower part of the plunger 10 to close the lower end of the plunger 10, because of the mechanical forced start, the influence of the gas in the plunger 10 on the movement of the traveling valve 11 is basically eliminated, and because the plunger 10 moves upward to reduce the pressure in the pump cylinder 9, the external relatively high-pressure crude oil can push the fixed valve ball 123 to enter the pump cylinder 9, and as shown in fig. 2, due to the blocking effect of the fixed valve cover 122, the fixed valve ball 123 cannot move further upward. The butterfly valve 4 moves upwards along with the pull rod 1 under the combined action of friction force of the pull rod 1 and upwards moving crude oil, the plunger pressing ring 8 is always sealed on the upper portion of the plunger 10, the plunger 10 pushes the pull rod 1, the plunger 10 and the traveling valve 11 to move upwards continuously due to continuous improvement of pressure of crude oil entering through the fixed valve 12, the crude oil on the plunger pressing ring 8 enters an oil pipeline through a through hole 31 formed in the butterfly valve cover 3, and when the butterfly valve 4 moves upwards to abut against the butterfly valve cover 3 to seal the through hole 31 on the butterfly valve cover 3, the upward stroke is completed, as shown in fig. 3.
During downstroke, the pull rod 1 is pushed downwards, the butterfly valve 4 is rapidly seated on the butterfly valve seat 7 under the combined action of crude oil and friction in an oil pipe, the gravity of the crude oil exerted on the butterfly valve 4 is transmitted to the butterfly valve seat 7, and the pull rod 1 does not bear the crude oil load, so that a sucker rod connected with the pull rod 1 is only subjected to the gravity of the sucker rod and the butterfly valve 4, the upward friction force generated between the sucker rod and the crude oil, and the gravity of the crude oil acting on the traveling valve 11 in the plunger 10. Move down the valve 11 and move down along with pull rod 1 in the promotion of pull rod 1, open the lower extreme of plunger 10 rapidly, the utility model discloses a pull rod 1 drives traveling valve 11 and moves up and down, promptly, adopts the strong closed structure of opening of mechanical type, has overcome the inside gas of plunger to the resistance of traveling valve upper and lower removal, has eliminated the influence that gas opened traveling valve 11. In addition, due to the rise of the downward pressure, the fixed valve ball 123 moves downward and is rapidly seated on the fixed valve seat 124, see fig. 5. The plunger 10 and the plunger pressing ring 8 are moved downward together by the oil pressure in the pump cylinder 9, and the traveling valve 11 and the plunger pressing ring 8 close the upper and lower ends of the plunger 10 again, and the down stroke is ended as shown in fig. 6.
The utility model discloses a prevent gas oil-well pump through fixing traveling valve 11 in the bottom of pull rod 1, with 1 synchronous motion of pull rod to under the drive of pull rod 1, realized that traveling valve 11 is forced to open or seal the mechanical type of plunger 10 lower extreme, in the downstroke, under the resistance effect of crude oil, form speed difference between plunger 10 and the traveling valve 11, guaranteed that the traveling valve can open rapidly, eliminated the influence that gas pressure opened or closed traveling valve 11 in the plunger. Furthermore, because the utility model discloses butterfly valve and the non-fixed connection of pull rod 1, but on pull rod 1 was arranged in to the cover, consequently, in the up and down stroke conversion process, exert the crude oil weight on butterfly valve 4, on disk valve seat 7 was used through butterfly valve 4, greatly reduced the impact load to pull rod 1, sucker rod to reduced the sucker rod and disconnected the probability of taking off, reduced the daily maintenance work load among the crude oil production, further reduced crude oil production cost. Therefore, the utility model discloses have the dual function of preventing "airlock" ("steam lock") and reducing the shock load to the sucker rod, the great ultra-deep well of the higher oil well of specially adapted gas content and shock load.
The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any person skilled in the art should also realize that such equivalent changes and modifications can be made without departing from the spirit and principles of the present invention.
Claims (10)
1. The air-tight oil well pump is characterized by comprising a pump cylinder, wherein two ends of the pump cylinder are respectively connected with a lifting short circuit and a fixed valve; the plunger is arranged in the pump cylinder and can move along the axial direction of the pump cylinder; a pull rod stretches into in promotion short circuit and the plunger, a dish valve cover can move ground cover establish on the pull rod to be located plunger upper portion, a traveling valve sets up the lower extreme of plunger and with position pole lower extreme fixed connection.
2. The gas-tight oil pump of claim 1, wherein a butterfly valve cover and a butterfly valve seat are disposed in the lifting sub, and the butterfly valve is located between the butterfly valve cover and the butterfly valve seat.
3. The gas-tight oil pump of claim 2, wherein the butterfly valve housing has a plurality of axial through holes, and the butterfly valve closes the through holes.
4. The gasproof oil-well pump of claim 2, characterized in that the pull rod is further sleeved with a plunger press ring, the plunger press ring is arranged at the lower part of the disk valve seat and is positioned at the upper part of the plunger, and the plunger can be closed.
5. The gas-tight oil pump of claim 2, wherein the butterfly valve housing and the butterfly valve seat are threadedly connected to the lift sub.
6. The gas-tight oil pump as claimed in claim 1, wherein the fixed valve includes a fixed valve seat body connected to the pump cylinder, a fixed valve seat provided at a lower portion of the fixed valve seat body, a fixed valve ball capable of seating on the fixed valve seat, and a fixed valve cover provided in the fixed valve seat body and located at an upper portion of the fixed valve ball.
7. The gas-tight oil pump of any one of claims 1 to 6, wherein the upper end of the rod forms a boss capable of being connected to a rod release.
8. The gas-tight oil pump of claim 7, wherein the upper portion of the lift sub is connected to the upper sub.
9. The gasproof oil pump of any one of claims 1 to 5, wherein the lifting sub, the pump barrel and the standing valve are connected by a screw thread.
10. The gas-tight oil pump as defined in claim 6, wherein the stationary valve cover and the stationary valve seat are respectively screw-coupled to the stationary valve seat body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220328394 CN202789460U (en) | 2012-07-06 | 2012-07-06 | Gas-proof oil well pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220328394 CN202789460U (en) | 2012-07-06 | 2012-07-06 | Gas-proof oil well pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202789460U true CN202789460U (en) | 2013-03-13 |
Family
ID=47816732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220328394 Expired - Fee Related CN202789460U (en) | 2012-07-06 | 2012-07-06 | Gas-proof oil well pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202789460U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819139A (en) * | 2015-04-10 | 2015-08-05 | 中国石油天然气股份有限公司 | Dual-load-shedding air-proof oil well pump |
| WO2016161611A1 (en) * | 2015-04-10 | 2016-10-13 | 中国石油天然气股份有限公司 | Air proof pumpjack with double load reduction |
| CN112594174A (en) * | 2020-11-26 | 2021-04-02 | 中国石油天然气股份有限公司 | Oil-well pump for oil pumping machine to exploit petroleum and natural gas |
-
2012
- 2012-07-06 CN CN 201220328394 patent/CN202789460U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104819139A (en) * | 2015-04-10 | 2015-08-05 | 中国石油天然气股份有限公司 | Dual-load-shedding air-proof oil well pump |
| WO2016161611A1 (en) * | 2015-04-10 | 2016-10-13 | 中国石油天然气股份有限公司 | Air proof pumpjack with double load reduction |
| CN112594174A (en) * | 2020-11-26 | 2021-04-02 | 中国石油天然气股份有限公司 | Oil-well pump for oil pumping machine to exploit petroleum and natural gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20210706 |