CN209687458U - Balanced type anchor packer - Google Patents
Balanced type anchor packer Download PDFInfo
- Publication number
- CN209687458U CN209687458U CN201920305598.3U CN201920305598U CN209687458U CN 209687458 U CN209687458 U CN 209687458U CN 201920305598 U CN201920305598 U CN 201920305598U CN 209687458 U CN209687458 U CN 209687458U
- Authority
- CN
- China
- Prior art keywords
- ring
- anchor packer
- wall
- packing element
- backing
- 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.)
- Active
Links
Abstract
The utility model discloses a kind of balanced type anchor packers, it is related to anchor packer technical field, it includes top connection, the lower surface of the top connection is provided with track pipe, the lower surface of the track pipe is provided with inner central tube, the lower surface of the inner central tube is provided with adjusting ring, and the adjusting ring inner wall is provided with sealing centrum, and the upper surface of the sealing centrum and the lower surface of track pipe overlap.The balanced type anchor packer, pass through setting top connection, track pipe, balance housing, inner central tube, wiper block, adjustable spring and firm banking, realize anchor packer bearing up-down force balance, so that anchor packer is not easily disconnected from track when being moved, and reduce side packing element and middle packing element and other component stress friction dynamics, it effectively prevents when anchor packer above mentions and swabbing occurs, reduce the abrasion of side packing element and middle packing element, the using effect of the anchor packer is improved, the service life of the anchor packer is also extended.
Description
Technical field
The utility model relates to anchor packer technical field, specially a kind of balanced type anchor packer.
Background technique
Anchor packer is used for the test of cased hole, it is made of bypass, sealing element and slips assembly three parts, envelope
When device is gone into the well, lug is among the short slot of automatic tank, and friction pad is close to internal surface of sleeve pipe always, and packing element is in free shape
State, by-pass are open.
In the deep operation of oilfield exploitation, anchor packer is often used, is needed since oil field well slips insulates
Otherwise same effect purpose, existing some anchor packer types are more, can be used for different underground work, but existing
Packer function is relatively simple, needs to carry out operation in underground using different anchor packers, is unable to satisfy successively slips envelope
It once goes into the well every device and completes the work of multiple projects, not only increase cost required for oilfield exploitation operation, also reduce work
Make the working efficiency of personnel, and the anchoring when carrying out operation of existing some anchor packers is relatively secured, seals to slips
Very difficult, not opposite balanced measure when being unsealed after device is to the work of different well layers, on anchor packer on tubing string
When mentioning, it may appear that swabbing causes anchor packer by biggish abrasion, side packing element and middle packing element is caused to wear, therefore,
Need a kind of multi-functional balanced type anchor packer.
Utility model content
(1) the technical issues of solving
In view of the deficiencies of the prior art, the utility model provides a kind of balanced type anchor packer, solves existing
Some anchor packer types are more, can be used for different underground work, but existing packer function is relatively simple, needs
Operation is carried out in underground using different anchor packers, successively anchor packer is unable to satisfy and once goes into the well and complete multiple projects
Work, not only increase cost required for oilfield exploitation operation, and existing some anchor packers are carrying out operation
When anchoring it is relatively secured, to anchor packer to different well layers work after unseal when it is very difficult, also reduce work
The working efficiency of personnel, not opposite balanced measure, when tubing string above mentions on anchor packer, it may appear that swabbing causes
Anchor packer is by biggish abrasion, the problem of causing side packing element to wear.
(2) technical solution
To achieve the above objectives, the technical scheme adopted by the utility model is that: a kind of balanced type anchor packer, including upper
Connector, the lower surface of the top connection are provided with track pipe, and the lower surface of the track pipe is provided with inner central tube, it is described it is interior in
The lower surface of heart pipe is provided with adjusting ring, and the adjusting ring inner wall is provided with sealing centrum, the upper surface of the sealing centrum with
The lower surface of track pipe overlaps, and the left side for adjusting ring inner wall is fixedly connected with triangle packing, the following table for adjusting ring
Face is connected by the first backing-up screw with the lower surface of sealing centrum, is fixedly connected sequentially between the adjusting ring and middle packing element
There are side packing element and spacer ring.
The upper surface of the side packing element, spacer ring and middle packing element is fixedly connected with the lower surface of inner central tube, the track
The lower surface of pipe and the upper surface of bullet overlap, and the lower surface of the bullet inner wall passes through the second backing-up screw and cone cap
The upper surface of inner wall be connected, the upper surface of the cone cap is fixedly connected with the lower surface of inner central tube, the bullet
Lower surface and the upper surface of slips part overlap, the slips part is socketed in slip sleeve, the right side setting of the slip sleeve
There is slip spider, the upper surface of the slip spider and the lower surface of slips part overlap.
The upper surface of the slip spider is connected by third backing-up screw with the lower surface that steel ball covers, the slip spider
Lower surface is connected by the 4th backing-up screw with the upper surface of Lock spring sheath, steel ball set and Lock spring sheath it
Between be provided with Lock spring, the upper surface of the Lock spring sheath and the bottom of locking steel ball overlap, and the locking steel ball is set
It sets in steel ball set, the lower surface of the track pipe is fixedly connected with release set, and the upper surface of the release set is anti-by the 5th
Loose screw is connected with the lower surface of firm banking, and the upper surface of the firm banking and the lower surface of track pipe overlap, described
The lower surface of firm banking is connected by the 6th backing-up screw with the upper surface of stop-ring.
Preferably, the upper surface of the stop-ring is provided with reversing pin, and the lower surface of the stop-ring is locking by the 7th
Screw is connected with the upper surface of the inner wall of baffle ring pressure cap, the fixed company in the upper surface of the baffle ring pressure cap and the lower surface of track pipe
It connects, the right side of the reversing pin is provided with change.
Preferably, it is described release set inner wall upper surface and stop-ring inner wall upper surface respectively with the lower surface of wiper block
The lower surface of overlap joint, the inner wall of the wiper block connects by the way that the upper surface of several adjustable springs and firm banking inner wall is fixed
It connects.
Preferably, the front of the sealing centrum is provided with O-ring, under the upper surface and inner central tube of the O-ring
Surface is fixedly connected, and the lower surface for adjusting ring is provided with balance housing, and the balance external is set on the following table of top connection
Face.
(3) beneficial effect
The utility model has the beneficial effects that:
1, the balanced type anchor packer passes through setting top connection, track pipe, balance housing, triangle packing, interior center
Pipe, wiper block, adjustable spring and firm banking can switch reversing pin, by slips before placing anchor packer in well layer
Track pipe on packer, which is placed on, goes into the well on track, so that slips part is always maintained at rounding state, top connection is moved down, and makes
Side packing element and middle packing element compressed after outer diameter become larger so that the elastic force of adjustable spring squeezes wiper block, when above proposing slips packing
When device, balance housing can cooperate with wiper block and be pressurized, and anchor packer bearing up-down force balance be realized, so that anchor packer
It is not easily disconnected from track when being moved, and reduces side packing element and middle packing element and other component stress friction dynamics, has
There is swabbing in effect when anchor packer being prevented above to mention, reduce the abrasion of side packing element and middle packing element, improve the card
The using effect of watt packer, also extends the service life of the anchor packer.
2, balanced type anchor packer, by the way that top connection, O-ring, inner central tube, slips part, slip sleeve, slips is arranged
Seat, triangle packing and sealing centrum, after the anchor packer goes into the well layer, side packing element and middle packing element are shunk, and balance housing is in
Free state, slips part are pushed open by bullet, and are caught in slip sleeve inner wall, and O-ring is engaged on sealing centrum,
The effect of sealing is effectively played, so that the significantly more efficient receiving sealing centrum of sealing centrum and top connection and well layer inner wall institute
The pressure of formation, sealing centrum sealing seal to form dual layer sealing effect with O-ring, improve the steady of anchor packer work
It is qualitative.
3, the balanced type anchor packer by setting inner central tube, adjusts ring, steel ball set, Lock spring sheath, locking
Steel ball, lock ball set and Lock spring, when the anchor packer is worked, when increasing the pressure inside anchor packer,
After anchor packer is squeezed because of pressure, Lock spring effectively plays the role of buffering, so that Lock spring stress is squeezed
Lock spring sheath is pressed, so that Lock spring sheath plays the effect of support, and locks steel ball because of the pressure of Lock spring
Rolled so that anchor packer is not easily susceptible to biggish damage in the state of setting, increase anchor packer by
Pressure energy power, and anchor packer is not forced generation offset phenomena, i.e., and the anchor packer can carry out under the state that sets
Autonomous detection, can also cooperate other correlation detectors to carry out the detection of well layer, multiple projects can be completed by once going into the well
Work, reduce cost required for work, improve staff work efficiency.
Detailed description of the invention
Fig. 1 is the schematic diagram of the section structure that the utility model is faced；
Fig. 2 is the structural schematic diagram at the utility model A；
Fig. 3 is the structural schematic diagram at the utility model B；
Fig. 4 is the structural schematic diagram at the utility model C.
In figure: 1 top connection, 2 tracks pipe, 3 balance housings, 4 triangle packings, 5 first backing-up screws, 6 sealing centrums, 7 O
Type circle, 8 inner central tubes, 9 adjust rings, 10 side packing elements, 11 spacer rings, packing element, 13 cone caps, 14 second backing-up screws, 15 cones in 12
Body, 16 soket head cap screws, 17 slip sleeves, 18 slips parts, 19 slip spiders, 20 third backing-up screws, 21 the 4th backing-up screws, 22
Lock spring, 23 steel ball sets, 24 Lock spring sheaths, 25 locking steel balls, 26 lock ball sets, 27 release sets, 28 the 5th backing-up screws,
It is 29 firm bankings, 30 wiper blocks, 31 adjustable springs, 32 the 6th backing-up screws, 33 stop-ring, 34 baffle ring pressure caps, 35 the 7th locking
Screw, 36 changes, 37 reversing pins.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figs 1-4, the utility model provides a kind of technical solution: a kind of balanced type anchor packer, including above connects
First 1, the lower surface of top connection 1 is provided with track pipe 2, and the lower surface of track pipe 2 is provided with inner central tube 8, under inner central tube 8
Surface, which is provided with, adjusts ring 9, adjusts 9 inner wall of ring and is provided with sealing centrum 6, by the way that reversing pin 37 is arranged, when by anchor packer
Before placing in well layer, reversing pin 37 can be switched, the track pipe 2 on anchor packer is placed on and is gone into the well on track, so that card
Watt part 18 is always maintained at rounding state, and the lower surface of the upper surface and track pipe 2 that seal centrum 6 overlaps, and seals the front of centrum 6
It is provided with O-ring 7, the upper surface of O-ring 7 is fixedly connected with the lower surface of inner central tube 8, and the lower surface for adjusting ring 9 is provided with
Housing 3 is balanced, the lower surface of top connection 1 is arranged in balance housing 3, passes through setting O-ring 7 and sealing centrum 6,18 quilt of slips part
Bullet 15 is pushed open, and is caught in 17 inner wall of slip sleeve, and O-ring 7 is engaged on sealing centrum 6, is effectively played
The effect of sealing is formed by so that sealing significantly more efficient receivings of centrum 6 seals centrum 6 with top connection 1 and well layer inner wall
Pressure, the sealing of sealing centrum 6 form dual layer sealing effect with the sealing of O-ring 7, and the left side for adjusting 9 inner wall of ring is fixedly connected with
Triangle packing 4, adjust ring 9 lower surface by the first backing-up screw 5 with seal centrum 6 lower surface be connected, adjusting ring 9 and
Being fixedly connected sequentially between middle packing element 12 has side packing element 10 and spacer ring 11.
The upper surface of side packing element 10, spacer ring 11 and middle packing element 12 is fixedly connected with the lower surface of inner central tube 8, track pipe
2 lower surface and the upper surface of bullet 15 overlap, and housing 3 are balanced by setting, when above mentioning anchor packer, so that slips
Packer is not easily disconnected from track when being moved, and reduces side packing element 10 and middle packing element 12 and other component stress is rubbed
The lower surface of wiping dynamics, 15 inner wall of bullet is connected by the second backing-up screw 14 with the upper surface of the inner wall of cone cap 13,
The upper surface of cone cap 13 is fixedly connected with the lower surface of inner central tube 8, the lower surface of bullet 15 and the upper table of slips part 18
Face overlap joint, by the way that adjustable spring 31 is arranged, so that the elastic force of adjustable spring 31 squeezes wiper block 30, so that balance housing 3 can be with
Wiper block 30, which cooperates, to be pressurized, and anchor packer bearing up-down force balance is realized, when effectively preventing anchor packer and above mentioning
There is swabbing, reduces the abrasion of side packing element 10 and middle packing element 12, improve the using effect of the anchor packer, slips
Part 18 is socketed in slip sleeve 17, and the right side of slip sleeve 17 is provided with slip spider 19, the upper surface of slip spider 19 and slips part
18 lower surface overlap joint.
The upper surface of slip spider 19 is connected by third backing-up screw 20 with the lower surface of steel ball set 23, slip spider 19
Lower surface is connected by the 4th backing-up screw 21 with the upper surface of Lock spring sheath 24, steel ball set 23 and Lock spring sheath
It is provided with Lock spring 22 between 24, by setting Lock spring 22 and Lock spring sheath 24, is carried out in the anchor packer
When work, when increasing the pressure inside anchor packer, after anchor packer is squeezed because of pressure, Lock spring 22 is effective
Play the role of buffering so that 22 stress of Lock spring squeeze Lock spring sheath 24 so that Lock spring sheath 24 rises
The effect of support is arrived, the upper surface of Lock spring sheath 24 and the bottom of locking steel ball 25 overlap, and the locking setting of steel ball 25 exists
In steel ball set 23, the lower surface of track pipe 2 is fixedly connected with release set 27, and release covers in the upper surface and stop-ring 33 of 27 inner walls
The upper surface of wall is overlapped with the lower surface of wiper block 30 respectively, and the lower surface of the inner wall of wiper block 30 passes through several adjustable springs
31 are fixedly connected with the upper surface of 29 inner wall of firm banking, lock steel ball 25 by setting, lock steel ball 25 because of Lock spring 22
Pressure rolled so that anchor packer is not easily susceptible to biggish damage in the state of setting, increase slips packing
The compression capability of device, and anchor packer is not forced generation offset phenomena, and the upper surface of release set 27 is locking by the 5th
Screw 28 is connected with the lower surface of firm banking 29, and the upper surface of firm banking 29 and the lower surface of track pipe 2 overlap, baffle ring
The upper surface of part 33 is provided with reversing pin 37, and the lower surface of stop-ring 33 is interior by the 7th backing-up screw 35 and baffle ring pressure cap 34
The upper surface of wall is connected, and the upper surface of baffle ring pressure cap 34 is fixedly connected with the lower surface of track pipe 2, the right side of reversing pin 37
It is provided with change 26, by setting change 26, staff is facilitated to be adjusted and limit reversing pin 37, firm banking 29
Lower surface is connected by the 6th backing-up screw 32 with the upper surface of stop-ring 33.
The operating procedure of the utility model are as follows:
S1, after the anchor packer goes into the well layer, side packing element 10 and middle packing element 12 are shunk, and balance housing 3 is in free shape
State, slips part 18 are pushed open by bullet 15, and are caught in 17 inner wall of slip sleeve, and O-ring 7 is nibbled on sealing centrum 6
It closes, effectively plays the effect of sealing, sealing centrum 6 is allowed to bear sealing centrum 6 and top connection 1 and well layer inner wall institute
The pressure of formation；
S2, when increase anchor packer inside pressure when, after anchor packer is squeezed because of pressure, Lock spring 22
Effectively play the role of buffering, so that 22 stress of Lock spring squeezes Lock spring sheath 24, so that Lock spring sheath
24 play the effect of support, and lock steel ball 25 because the pressure of spring is rolled；
S3, when by anchor packer place well layer in front of, reversing pin 37 can be switched, by anchor packer track manage
2 are placed on and go into the well on track, so that slips part 18 is always maintained at rounding state, top connection 1 is moved down, so that 10 He of side packing element
Outer diameter becomes larger after middle packing element 12 is compressed, so that the elastic force of adjustable spring 31 squeezes wiper block 30, when above mentioning, balances housing 3
It can cooperate and be pressurized with wiper block 30, anchor packer bearing up-down force balance be realized, so that anchor packer is being moved
When be not easily disconnected from track, and reduce side packing element 10 and middle packing element 12 and other component stress friction dynamics.
Above-described specific embodiment, to the purpose of this utility model, technical scheme and beneficial effects carried out into
One step is described in detail, it should be understood that being not used to limit the foregoing is merely specific embodiment of the present utility model
The utility model processed, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done,
It should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of balanced type anchor packer, including top connection (1), it is characterised in that: the lower surface of the top connection (1) is arranged
There is track to manage (2), the lower surface of the track pipe (2) is provided with inner central tube (8), and the lower surface of the inner central tube (8) is set
It is equipped with and adjusts ring (9), adjusting ring (9) inner wall is provided with sealing centrum (6), the upper surface of sealing centrum (6) and rail
The lower surface of mark pipe (2) overlaps, and the left side for adjusting ring (9) inner wall is fixedly connected with triangle packing (4), the adjusting ring
(9) lower surface is connected by the first backing-up screw (5) with the lower surface of sealing centrum (6), the adjusting ring (9) and middle glue
Being fixedly connected sequentially between cylinder (12) has side packing element (10) and spacer ring (11)；
The upper surface of the side packing element (10), spacer ring (11) and middle packing element (12), which is fixed with the lower surface of inner central tube (8), to be connected
It connects, the lower surface of the track pipe (2) and the upper surface of bullet (15) overlap, and the lower surface of bullet (15) inner wall is logical
The second backing-up screw (14) is crossed to be connected with the upper surface of the inner wall of cone cap (13), the upper surface of the cone cap (13) with it is interior
The lower surface of central tube (8) is fixedly connected, and the lower surface of the bullet (15) and the upper surface of slips part (18) overlap, described
Slips part (18) is socketed in slip sleeve (17), and the right side of the slip sleeve (17) is provided with slip spider (19), the slips
The upper surface of seat (19) and the lower surface of slips part (18) overlap；
The upper surface of the slip spider (19) is connected by third backing-up screw (20) with the lower surface of steel ball set (23), described
The lower surface of slip spider (19) is connected by the 4th backing-up screw (21) with the upper surface of Lock spring sheath (24), the steel
It is provided between ball cover (23) and Lock spring sheath (24) Lock spring (22), the upper surface of the Lock spring sheath (24)
It is overlapped with the bottom of locking steel ball (25), locking steel ball (25) setting is in steel ball set (23), under the track pipe (2)
Surface is fixedly connected with release set (27), and the upper surface of the release set (27) passes through the 5th backing-up screw (28) and firm banking
(29) lower surface is connected, and the lower surface of the upper surface of the firm banking (29) and track pipe (2) overlaps, the fixed bottom
The lower surface of seat (29) is connected by the 6th backing-up screw (32) with the upper surface of stop-ring (33).
2. balanced type anchor packer according to claim 1, it is characterised in that: the upper surface of the stop-ring (33) is set
It is equipped with reversing pin (37), the lower surface of the stop-ring (33) passes through the inner wall of the 7th backing-up screw (35) and baffle ring pressure cap (34)
Upper surface be connected, the upper surface of the baffle ring pressure cap (34) is fixedly connected with the lower surface of track pipe (2), the reversing pin
(37) right side is provided with change (26).
3. balanced type anchor packer according to claim 1, it is characterised in that: the upper table of described release set (27) inner wall
Face and the upper surface of stop-ring (33) inner wall are overlapped with the lower surface of wiper block (30) respectively, the inner wall of the wiper block (30)
Lower surface is fixedly connected by several adjustable springs (31) with the upper surface of firm banking (29) inner wall.
4. balanced type anchor packer according to claim 1, it is characterised in that: the front of sealing centrum (6) is set
It is equipped with O-ring (7), the upper surface of the O-ring (7) is fixedly connected with the lower surface of inner central tube (8), the adjusting ring (9)
Lower surface be provided with balance housing (3), it is described balance housing (3) setting top connection (1) lower surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920305598.3U CN209687458U (en) | 2019-03-12 | 2019-03-12 | Balanced type anchor packer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920305598.3U CN209687458U (en) | 2019-03-12 | 2019-03-12 | Balanced type anchor packer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209687458U true CN209687458U (en) | 2019-11-26 |
Family
ID=68604502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920305598.3U Active CN209687458U (en) | 2019-03-12 | 2019-03-12 | Balanced type anchor packer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209687458U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852384A (en) * | 2020-07-21 | 2020-10-30 | 肖云东 | Packer for oil field downhole |
| CN114412409A (en) * | 2022-02-16 | 2022-04-29 | 成都德维石油技术服务有限责任公司 | Mechanical packer |
| CN116446820A (en) * | 2023-04-27 | 2023-07-18 | 盐城市弘通石油机械有限公司 | Tail pipe top packer |
-
2019
- 2019-03-12 CN CN201920305598.3U patent/CN209687458U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852384A (en) * | 2020-07-21 | 2020-10-30 | 肖云东 | Packer for oil field downhole |
| CN114412409A (en) * | 2022-02-16 | 2022-04-29 | 成都德维石油技术服务有限责任公司 | Mechanical packer |
| CN114412409B (en) * | 2022-02-16 | 2023-08-08 | 成都德维石油技术服务有限责任公司 | Mechanical packer |
| CN116446820A (en) * | 2023-04-27 | 2023-07-18 | 盐城市弘通石油机械有限公司 | Tail pipe top packer |
| CN116446820B (en) * | 2023-04-27 | 2023-10-31 | 盐城市弘通石油机械有限公司 | Tail pipe top packer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209687458U (en) | Balanced type anchor packer | |
| CN202360045U (en) | An oil pipe compensator | |
| CN201396103Y (en) | Packer | |
| CN201593397U (en) | Downhole safety valve for oil and gas wells | |
| CN201103375Y (en) | Bidirectional sealing wedge type packer | |
| CN104389548B (en) | High temperature high voltage resistant tubing packer | |
| CN201794552U (en) | Large-diameter fracturing packer | |
| CN112983340B (en) | Packer for ultra-deep well | |
| CN105672938B (en) | A kind of bidirectionally anchoring mechanical packer | |
| CN207499836U (en) | A kind of self-test sealing packer | |
| CN103510905A (en) | Underground stratification testing sampling instrument variable-diameter packing structure | |
| US20230167703A1 (en) | Patching construction method using a hydraulic variable-grade expansion tool for blocking during drilling | |
| CN103835675B (en) | Long-rubber-sleeve compression type open hole packer | |
| CN202788736U (en) | Two-way pressure-bearing packer | |
| CN202970610U (en) | Oil and gas well underground casing pipe packer rubber sleeve | |
| CN206144512U (en) | High -temperature and high -pressure packer | |
| CN202755913U (en) | Oil casing joint | |
| CN204532133U (en) | A kind of piston type intelligent conversion joint | |
| CN210068069U (en) | Anti-leakage double-sealing well-flushing packer | |
| CN202483512U (en) | Mechanical shifting valve | |
| CN203594402U (en) | Oil tube plugging device | |
| CN202850935U (en) | Y521 packer | |
| CN2784580Y (en) | Hydraulic locking packer | |
| CN202707015U (en) | Equilibrium differential external casing packer | |
| CN201637545U (en) | Completion tool ground checkout device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |