CN202325333U - Expandable liner hanger - Google Patents
Expandable liner hanger Download PDFInfo
- Publication number
- CN202325333U CN202325333U CN 201120496001 CN201120496001U CN202325333U CN 202325333 U CN202325333 U CN 202325333U CN 201120496001 CN201120496001 CN 201120496001 CN 201120496001 U CN201120496001 U CN 201120496001U CN 202325333 U CN202325333 U CN 202325333U
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- sealing ring
- bypass valve
- expansion
- tube
- fixedly installed
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Abstract
The utility model relates to the technical field of liner hangers for well cementing and completion in an oil and gas field and provides an expandable liner hanger. The expandable liner hanger comprises an upper joint, a connecting sleeve, a bypass valve, a ball seat, a tieback tube, a central tube, a backflow part, an expansion tube and a lower joint; the outer side of the upper part of the upper joint is fixedly installed with the inner side of the upper part of the connecting sleeve together, and the inner side of the lower part of the connecting sleeve is fixedly installed with the outer side of the upper part of the bypass valve together; a first sealing cavity is formed among the upper joint, the connecting sleeve and the bypass valve, and the upper joint is provided with a hole communicated with the sealing cavity. The expandable liner hanger has the beneficial effects that the structure is reasonable and compact, and the use is convenient; an expansion cone moves downwards through pitching and hydraulic pressure to extrude the expansion tube to expand along the radial direction and attach onto the inner wall of an outer sleeve; the expandable liner hanger is pressed downwardly and lifted, so that lost gloves are separated from a claw sleeve, thereby the safe and effective operation of the expandable liner hanger and the effective implementation of well cementing and completion operation are ensured; the expandable liner hanger is simple in structure and convenient in operation, and the safety and the reliability of the expandable liner hanger are improved.
Description
Technical field
the utility model relates to the solid completion of oil gas field and uses the extension hanger technical field, is a kind of expansion extension hanger.
Background technology
in solid completion practice, using extension hanger is that adopting more at present also is the most general technical measures.Yet the present extension hanger of The field have the problem of tail pipe overlay segment cementing quality difference, and along with being on the increase of exceptional wells such as deep-well, ultradeep well, horizontal well, hole condition is complicated more.Under these abominable hole conditions, the conventional tail pipe hanger seat often occurs and hangs or set situation such as inefficacy, has a strong impact on final completion effect; Simultaneously, owing to behind the present extension of the extension hanger that uses at present, will therefore will have influence on technical measures such as follow-up well workover and lower oil-extracting pump, make troubles to subsequent job in the follow-up underground work borehole size being limited.
Summary of the invention
the utility model provides a kind of expansion extension hanger; Overcome the deficiency of above-mentioned prior art, its can effectively solve existing apparatus exist tail pipe overlay segment cementing quality poor, under abominable hole condition, often occur sitting hanging or setting and lost efficacy and sit the problem that in the follow-up underground work in back borehole size is limited of hanging.
The technical scheme of
the utility model realizes through following measure: a kind of expansion extension hanger comprises top connection, adapter sleeve, bypass valve, ball seat, tieback tube, central tube, backflow part, expansion tube and lower contact; The upper outside of top connection and the upper inner of adapter sleeve are fixedly installed togather, and the lower inside of adapter sleeve and the upper outside of bypass valve are fixedly installed togather, and form first annular seal space between top connection, adapter sleeve and the bypass valve; The hole that communicates with annular seal space is arranged in top connection, have two liquid flow holes that communicate with annular seal space vertically at least, between top connection and bypass valve, ball seat is installed at the middle part of bypass valve; The upper inner of ball seat is up-narrow and down-wide inclined-plane; The bottom of bypass valve is installed in the tieback tube, and the outside, upper end inboard and central tube, the lower end of bypass valve is fixedly installed togather, and the upper inner of the lower outside of central tube and backflow part is fixedly installed togather; Be fixed with the urceolus of internal diameter greater than backflow part internal diameter in the upper end of backflow part; The lower inside of tieback tube and the outside, the upper end of expansion tube are fixedly installed togather, and are installed with expanded rubber in the outside, middle part of expansion tube, and the outside, upper end inboard and lower contact, the lower end of expansion tube is fixedly installed togather; Form installation cavity between bypass valve, central tube, backflow part, urceolus, lower contact, expansion tube and the tieback tube; Connector, expansion cone seat, pawl cover and the cover of giving up are installed in installation cavity from top to bottom, are fixed with boss in the upper outside of expansion cone seat, the upper inner of connector and the lower outside of bypass valve are fixedly installed togather; The lower end of connector is stuck in the expansion cone seat and the ring cavity between the expansion tube above boss; Bottom at the expansion cone seat is installed with interstage sleeve, between interstage sleeve and the pawl cover spacing is arranged, and between boss and interstage sleeve, forms the expansion cone mounting groove; In the expansion cone mounting groove, expansion cone is installed; The outside of expansion cone is the narrow waist drum shape in thick middle both sides, has in the inboard of expansion tube and corresponding inclined-plane, the bottom of expansion cone, and the lower bevel of expansion cone is pressed on the inclined-plane of expansion tube; Upper end and the central tube that overlaps of giving up links together through dowel fixes; The lower end of pawl cover and the upper end of urceolus and lower contact are fixedly installed togather, and pawl cover, formation second annular seal space between cover and the central tube of giving up have the liquid flow hole that communicates with second annular seal space respectively vertically at the middle part of the backflow part and the cover of giving up.
Be to the further optimization of above-mentioned utility model technical scheme below or/and improve:
above-mentioned outside, middle part at expansion tube can be vulcanized has expanded rubber.
Can mesh together through claw type between
above-mentioned pawl cover and lower contact and the urceolus.
Can be fixedly installed togather through screw thread between
above-mentioned top connection and the adapter sleeve; Be fixedly installed togather through screw thread between adapter sleeve and the bypass valve; Be fixedly installed togather through screw thread between bypass valve and the connector; Be fixedly installed togather through screw thread between bypass valve and the central tube, be fixedly installed togather through screw thread between central tube and the backflow part, be fixedly installed togather through special thread between tieback tube and the expansion tube; Be fixedly installed togather through screw thread between expansion tube and the lower contact, be fixedly installed togather through screw thread between expansion cone seat and the interstage sleeve.
are above-mentioned can be equipped with sealing ring between top connection and adapter sleeve; Between adapter sleeve and bypass valve, sealing ring is installed, between top connection and ball seat, sealing ring is installed, between ball seat and bypass valve, sealing ring is installed; Between bypass valve and connector, sealing ring is installed; Between bypass valve and central tube, sealing ring is installed, between expansion cone seat and expansion cone, sealing ring is installed, central tube and give up the cover between sealing ring is installed; Between backflow part and lower contact, sealing ring is installed, between central tube and backflow part, sealing ring is installed.
the utility model reasonable and compact in structure; Easy to use; The descending extrusion expansion pipe of expansion cone radially expanded and be fitted on the outer layer sleeve inwall through pitching and hydraulic pressure, press down and on carry the novel cover of giving up that makes of this use and break away from the pawl cover, guarantee effective enforcement of its safe and effective operation and solid completion practice; Have simple in structurely and easy to operate, improved its security reliability.
Description of drawings
accompanying drawing 1 is looked the half section structural representation for the master on the utility model most preferred embodiment top.
accompanying drawing 2 is looked the half section structural representation for the master of the utility model most preferred embodiment bottom.
Coding in
accompanying drawing is respectively: 1 is top connection, and 2 is adapter sleeve, and 3 is bypass valve, and 4 is ball seat, and 5 is the tieback tube; 6 is central tube, and 7 are the backflow part, and 8 is expansion tube, and 9 are lower contact, and 10 is the pawl cover; 11 are the cover of giving up, and 12 is the expansion cone seat, and 13 is interstage sleeve, and 14 is expansion cone, and 15 are pin; 16 is connector, and 17 is expanded rubber, and 18 is first annular seal space, and 19 is the hole, and 20 is installation cavity; 21 is boss, and 22 is second annular seal space, and 23 is sealing ring, and 24 is liquid flow hole, and 25 is urceolus.
The specific embodiment
the utility model does not receive the restriction of following embodiment, can confirm concrete embodiment according to the technical scheme and the actual conditions of the utility model.
are in the utility model; For the ease of describing; The description of the relative position relation of each parts all is to describe according to the Butut mode of Figure of description, as: the position relation of forward and backward, upper and lower, left and right etc. is what to confirm according to the Butut direction of Figure of description.
Below in conjunction with embodiment and accompanying drawing the utility model is further described:
like accompanying drawing 1, shown in 2, this expansion extension hanger comprises top connection 1, adapter sleeve 2, bypass valve 3, ball seat 4, tieback tube 5, central tube 6, backflow part 7, expansion tube 8 and lower contact 9; The upper inner of the upper outside of top connection 1 and adapter sleeve 2 is fixedly installed togather; The upper outside of the lower inside of adapter sleeve 2 and bypass valve 3 is fixedly installed togather, and forms first annular seal space 18 between top connection 1, adapter sleeve 2 and the bypass valve 3, and the hole 19 that communicates with annular seal space 18 is arranged in top connection 1; Have two liquid flow holes 24 that communicate with annular seal space 18 vertically at least at the middle part of bypass valve 3; Between top connection 1 and bypass valve 3, ball seat 4 is installed, the upper inner of ball seat 4 is up-narrow and down-wide inclined-plane, and the bottom of bypass valve 3 is installed in the tieback tube 5; The outside, upper end inboard and central tube 6, the lower end of bypass valve 3 is fixedly installed togather; The upper inner of the lower outside of central tube 6 and backflow part 7 is fixedly installed togather, and is fixed with the urceolus 25 of internal diameter greater than backflow part 7 internal diameters in the upper end of backflow part 7, and the outside, upper end of the lower inside of tieback tube 5 and expansion tube 8 is fixedly installed togather; The outside, middle part at expansion tube 8 is installed with expanded rubber 17; The outside, upper end inboard and lower contact 9, the lower end of expansion tube 8 is fixedly installed togather, and forms installation cavity 20 between bypass valve 3, central tube 6, backflow part 7, urceolus 25, lower contact 9, expansion tube 8 and the tieback tube 5, and connector 16, expansion cone seat 12, pawl cover 10 and the cover 11 of giving up are installed in installation cavity 20 from top to bottom; Upper outside at expansion cone seat 12 is fixed with boss 21; The lower outside of the upper inner of connector 16 and bypass valve 3 is fixedly installed togather, and the lower end of connector 16 is stuck in the expansion cone seat 12 and the ring cavity between the expansion tube 8 above boss 21, is installed with interstage sleeve 13 in the bottom of expansion cone seat 12; Between interstage sleeve 13 and the pawl cover 10 spacing is arranged; Between boss 21 and interstage sleeve 13, form the expansion cone mounting groove, expansion cone 14 is installed in the expansion cone mounting groove, the outside of expansion cone 14 is the narrow waist drum shape in thick middle both sides; Have and corresponding inclined-plane, the bottom of expansion cone 14 in the inboard of expansion tube 8; The lower bevel of expansion cone 14 is pressed on the inclined-plane of expansion tube 8, and give up cover 11 upper end and central tube 6 15 are fixed together through pinning, and the lower end of pawl cover 10 and the upper end of urceolus 25 and lower contact 9 are fixedly installed togather; Pawl cover 10, formation second annular seal space 22 between cover 11 and the central tube 6 of giving up have the liquid flow hole 24 that communicates with second annular seal space 22 respectively vertically at the middle part of the backflow part 7 and the cover 11 of giving up.
Can according to actual needs above-mentioned expansion extension hanger be done further to optimize or/and improve:
shown in accompanying drawing 2, sulfuration has expanded rubber 17 outside the middle part of expansion tube 8.Like this, expanded rubber 17 has good friction suspension force to close sealability.
mesh together through claw type between pawl cover 10 and lower contact 9 and the urceolus 25 shown in accompanying drawing 2.Like this, be convenient to pawl is overlapped 10 axial location.
are like accompanying drawing 1, shown in 2; Be fixedly installed togather through screw thread between top connection 1 and the adapter sleeve 2; Be fixedly installed togather through screw thread between adapter sleeve 2 and the bypass valve 3, be fixedly installed togather through screw thread between bypass valve 3 and the connector 16, be fixedly installed togather through screw thread between bypass valve 3 and the central tube 6; Be fixedly installed togather through screw thread between central tube 6 and the backflow part 7; Be fixedly installed togather through special thread between tieback tube 5 and the expansion tube 8, be fixedly installed togather through screw thread between expansion tube 8 and the lower contact 9, be fixedly installed togather through screw thread between expansion cone seat 12 and the interstage sleeve 13.Like this, be convenient to installation and removal.
are like accompanying drawing 1, shown in 2; Between top connection 1 and adapter sleeve 2, sealing ring 22 is installed; Between adapter sleeve 2 and bypass valve 3, sealing ring 22 is installed, between top connection 1 and ball seat 4, sealing ring 22 is installed, between ball seat 4 and bypass valve 3, sealing ring 22 is installed; Between bypass valve 3 and connector 16, sealing ring 22 is installed; Between bypass valve 3 and central tube 6, sealing ring 22 is installed, between expansion cone seat 12 and expansion cone 14, sealing ring 22 is installed, sealing ring 22 is installed between 11 at the central tube 6 and the cover of giving up; Between backflow part 7 and lower contact 9, sealing ring 22 is installed, between central tube 6 and backflow part 7, sealing ring 22 is installed.Like this, be convenient to sealing.
above technical characterictic has constituted the most preferred embodiment of the utility model, and it has stronger compliance and best implementation result, can increase and decrease non-essential technical characterictic according to actual needs, satisfies the demand of different situations.
The use of
the utility model most preferred embodiment: during use the utility model lower end is connected on sleeve pipe (tail pipe) the pipe string; And behind the precalculated position, carry out the cementing operation through drilling rod according to design parameters; In the cementing job process; In order to guarantee good cementing quality, whole drill string can be rotated.After cementing job finishes, carry out the multiple working of drilling rod plug and sleeve pipe plug, promptly replace the slurry bruising.After bruising finished, the pitching operation was carried out on ground, and ball is stuck on the inboard inclined-plane of ball seat 4 after the pitching; Operation is suppressed on ground, and high-pressure fluid enters in first annular seal space 18 through the hole in the top connection 1 19, then through the liquid flow hole 24 on the bypass valve 3; On the top end face of expansion cone seat 12, form hydraulic coupling, it is descending together with expansion cone 14 to promote expansion cone seat 12, and expansion cone 14 descending extrusion expansion pipes 8 radially expand; Be fitted on the outer layer sleeve inwall after expansion tube 8 expands, expanded rubber 17 has good friction suspension force and sealability, after the expansion end of job; Ground presses down drill string, and drill string presses down and makes the liquid flow hole 24 of liquid through part 7 inside of refluxing, and gets in second annular seal space 22 through the cover 11 inner liquid flow holes 24 of giving up then; On carry drill string liquid and on cover 11 the top end face of giving up, form instantaneous hydraulic coupling; The pin 15 that connects between cover 11 and the central tube 6 of giving up is cut off, and the cover 11 of giving up breaks away from pawl cover 10, has realized the operation of giving up.Because the expanded radially of expansion tube 8 when guaranteeing good tail tube hanging ability and sealability, can guarantee the well latus rectum, for follow-up underground work offers convenience to greatest extent.
Claims (9)
1. an expansion extension hanger is characterized in that comprising top connection, adapter sleeve, bypass valve, ball seat, tieback tube, central tube, backflow part, expansion tube and lower contact; The upper outside of top connection and the upper inner of adapter sleeve are fixedly installed togather, and the lower inside of adapter sleeve and the upper outside of bypass valve are fixedly installed togather, and form first annular seal space between top connection, adapter sleeve and the bypass valve; The hole that communicates with annular seal space is arranged in top connection, have two liquid flow holes that communicate with annular seal space vertically at least, between top connection and bypass valve, ball seat is installed at the middle part of bypass valve; The upper inner of ball seat is up-narrow and down-wide inclined-plane; The bottom of bypass valve is installed in the tieback tube, and the outside, upper end inboard and central tube, the lower end of bypass valve is fixedly installed togather, and the upper inner of the lower outside of central tube and backflow part is fixedly installed togather; Be fixed with the urceolus of internal diameter greater than backflow part internal diameter in the upper end of backflow part; The lower inside of tieback tube and the outside, the upper end of expansion tube are fixedly installed togather, and are installed with expanded rubber in the outside, middle part of expansion tube, and the outside, upper end inboard and lower contact, the lower end of expansion tube is fixedly installed togather; Form installation cavity between bypass valve, central tube, backflow part, urceolus, lower contact, expansion tube and the tieback tube; Connector, expansion cone seat, pawl cover and the cover of giving up are installed in installation cavity from top to bottom, are fixed with boss in the upper outside of expansion cone seat, the upper inner of connector and the lower outside of bypass valve are fixedly installed togather; The lower end of connector is stuck in the expansion cone seat and the ring cavity between the expansion tube above boss; Bottom at the expansion cone seat is installed with interstage sleeve, between interstage sleeve and the pawl cover spacing is arranged, and between boss and interstage sleeve, forms the expansion cone mounting groove; In the expansion cone mounting groove, expansion cone is installed; The outside of expansion cone is the narrow waist drum shape in thick middle both sides, has in the inboard of expansion tube and corresponding inclined-plane, the bottom of expansion cone, and the lower bevel of expansion cone is pressed on the inclined-plane of expansion tube; Upper end and the central tube that overlaps of giving up links together through dowel fixes; The lower end of pawl cover and the upper end of urceolus and lower contact are fixedly installed togather, and pawl cover, formation second annular seal space between cover and the central tube of giving up have the liquid flow hole that communicates with second annular seal space respectively vertically at the middle part of the backflow part and the cover of giving up.
2. expansion extension hanger according to claim 1 is characterized in that the outside, the middle part sulfuration of expansion tube has expanded rubber.
3. expansion extension hanger according to claim 1 and 2 is characterized in that meshing together through claw type between pawl cover and lower contact and the urceolus.
4. expansion extension hanger according to claim 1 and 2; It is characterized in that being fixedly installed togather through screw thread between top connection and the adapter sleeve; Be fixedly installed togather through screw thread between adapter sleeve and the bypass valve, be fixedly installed togather through screw thread between bypass valve and the connector, be fixedly installed togather through screw thread between bypass valve and the central tube; Be fixedly installed togather through screw thread between central tube and the backflow part; Be fixedly installed togather through special thread between tieback tube and the expansion tube, be fixedly installed togather through screw thread between expansion tube and the lower contact, be fixedly installed togather through screw thread between expansion cone seat and the interstage sleeve.
5. expansion extension hanger according to claim 3; It is characterized in that being fixedly installed togather through screw thread between top connection and the adapter sleeve; Be fixedly installed togather through screw thread between adapter sleeve and the bypass valve, be fixedly installed togather through screw thread between bypass valve and the connector, be fixedly installed togather through screw thread between bypass valve and the central tube; Be fixedly installed togather through screw thread between central tube and the backflow part; Be fixedly installed togather through special thread between tieback tube and the expansion tube, be fixedly installed togather through screw thread between expansion tube and the lower contact, be fixedly installed togather through screw thread between expansion cone seat and the interstage sleeve.
6. expansion extension hanger according to claim 1 and 2 is characterized in that between top connection and the adapter sleeve sealing ring being installed, and between adapter sleeve and bypass valve, sealing ring is installed; Between top connection and ball seat, sealing ring is installed; Between ball seat and bypass valve, sealing ring is installed, between bypass valve and connector, sealing ring is installed, between bypass valve and central tube, sealing ring is installed; Between expansion cone seat and expansion cone, sealing ring is installed; Central tube and give up the cover between sealing ring is installed, between backflow part and lower contact, sealing ring is installed, between central tube and backflow part, sealing ring is installed.
7. expansion extension hanger according to claim 3 is characterized in that between top connection and the adapter sleeve sealing ring being installed, and between adapter sleeve and bypass valve, sealing ring is installed; Between top connection and ball seat, sealing ring is installed; Between ball seat and bypass valve, sealing ring is installed, between bypass valve and connector, sealing ring is installed, between bypass valve and central tube, sealing ring is installed; Between expansion cone seat and expansion cone, sealing ring is installed; Central tube and give up the cover between sealing ring is installed, between backflow part and lower contact, sealing ring is installed, between central tube and backflow part, sealing ring is installed.
8. expansion extension hanger according to claim 4 is characterized in that between top connection and the adapter sleeve sealing ring being installed, and between adapter sleeve and bypass valve, sealing ring is installed; Between top connection and ball seat, sealing ring is installed; Between ball seat and bypass valve, sealing ring is installed, between bypass valve and connector, sealing ring is installed, between bypass valve and central tube, sealing ring is installed; Between expansion cone seat and expansion cone, sealing ring is installed; Central tube and give up the cover between sealing ring is installed, between backflow part and lower contact, sealing ring is installed, between central tube and backflow part, sealing ring is installed.
9. expansion extension hanger according to claim 5 is characterized in that between top connection and the adapter sleeve sealing ring being installed, and between adapter sleeve and bypass valve, sealing ring is installed; Between top connection and ball seat, sealing ring is installed; Between ball seat and bypass valve, sealing ring is installed, between bypass valve and connector, sealing ring is installed, between bypass valve and central tube, sealing ring is installed; Between expansion cone seat and expansion cone, sealing ring is installed; Central tube and give up the cover between sealing ring is installed, between backflow part and lower contact, sealing ring is installed, between central tube and backflow part, sealing ring is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120496001 CN202325333U (en) | 2011-12-03 | 2011-12-03 | Expandable liner hanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120496001 CN202325333U (en) | 2011-12-03 | 2011-12-03 | Expandable liner hanger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202325333U true CN202325333U (en) | 2012-07-11 |
Family
ID=46437315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120496001 Withdrawn - After Issue CN202325333U (en) | 2011-12-03 | 2011-12-03 | Expandable liner hanger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202325333U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373892A (en) * | 2011-12-03 | 2012-03-14 | 中国石油集团西部钻探工程有限公司 | Expansion liner hanger |
| CN103485739A (en) * | 2013-09-18 | 2014-01-01 | 新疆贝肯能源工程股份有限公司 | Expansion type thermal production well tail pipe suspension device |
| CN103790534A (en) * | 2014-02-11 | 2014-05-14 | 中国石油集团西部钻探工程有限公司 | Expansion tail pipe hanging device |
| CN103758476B (en) * | 2014-01-03 | 2016-04-06 | 中国石油天然气股份有限公司 | Non-well cementation buckling type tail pipe hanger |
| CN105625971A (en) * | 2014-10-28 | 2016-06-01 | 中国石油化工股份有限公司 | Expansion hanger and sitting hanging method thereof |
-
2011
- 2011-12-03 CN CN 201120496001 patent/CN202325333U/en not_active Withdrawn - After Issue
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373892A (en) * | 2011-12-03 | 2012-03-14 | 中国石油集团西部钻探工程有限公司 | Expansion liner hanger |
| CN102373892B (en) * | 2011-12-03 | 2014-04-30 | 中国石油集团西部钻探工程有限公司 | Expansion liner hanger |
| CN103485739A (en) * | 2013-09-18 | 2014-01-01 | 新疆贝肯能源工程股份有限公司 | Expansion type thermal production well tail pipe suspension device |
| CN103485739B (en) * | 2013-09-18 | 2016-09-21 | 新疆贝肯能源工程股份有限公司 | Expansion type thermal production well tail pipe suspension device |
| CN103758476B (en) * | 2014-01-03 | 2016-04-06 | 中国石油天然气股份有限公司 | Non-well cementation buckling type tail pipe hanger |
| CN103790534A (en) * | 2014-02-11 | 2014-05-14 | 中国石油集团西部钻探工程有限公司 | Expansion tail pipe hanging device |
| CN105625971A (en) * | 2014-10-28 | 2016-06-01 | 中国石油化工股份有限公司 | Expansion hanger and sitting hanging method thereof |
| CN105625971B (en) * | 2014-10-28 | 2019-05-10 | 中国石油化工股份有限公司 | A kind of expansion hanger and its sit hanging method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120711 Effective date of abandoning: 20140430 |
|
| RGAV | Abandon patent right to avoid regrant |