CN202769105U - Threaded joint of oil well pipe - Google Patents
Threaded joint of oil well pipe Download PDFInfo
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- CN202769105U CN202769105U CN 201220342668 CN201220342668U CN202769105U CN 202769105 U CN202769105 U CN 202769105U CN 201220342668 CN201220342668 CN 201220342668 CN 201220342668 U CN201220342668 U CN 201220342668U CN 202769105 U CN202769105 U CN 202769105U
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- well pipe
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Abstract
The utility model discloses a threaded joint structure for an oil pipe, a sleeve tube or a pipeline tube which are used for an oil field. According to the technical scheme of a threaded joint of the oil well pipe, the threaded joint of the oil well pipe comprises an oil well pipe factory terminal, an oil well pipe field terminal and a coupling, male threads are arranged on the end portion of the oil well pipe factory terminal and the end portion of the oil well pipe field terminal, and the coupling is provided with a female thread. The threaded joint of the oil well pipe is characterized in that after two oil well pipes are connected and combined by utilizing the coupling, a small end surface with a male thread of the oil well pipe factory terminal of one oil well pipe closely contacts a small end surface with a male thread of the oil well pipe field terminal of the other oil well pipe, and the male thread of the oil well pipe factory terminal and the male thread of the oil well pipe field terminal are right-handed rotation threads or left-handed rotation threads synchronously. The thread pitch of the male thread of the oil well pipe factory terminal is smaller than that of the male thread of the oil well pipe field terminal, and likewise, the thread pitch for jointing the female thread on the coupling and the male thread of the oil well pipe factory terminal in a screwed mode is smaller than that for jointing the female thread on the coupling and the male thread of the oil well pipe field terminal in a screwed mode. By utilizing the threaded joint of the oil well pipe, comprehensive properties, such as threaded connection sealing property, buckling resistant property and the like, are better.
Description
Technical field
The utility model relates to the screw connection structure of the oil pipe, sleeve pipe or the line pipe that use in a kind of oil field.
Background technique
At present, the connecting means of known oil pipe, sleeve pipe or line pipe (general designation oil well pipe) has following three kinds:
1, the buttress thread of the round thread of API and API, the male thread small end end face 5 of the on-the-spot end 2 of clear oil well pipe can not be run into the male thread small end end face 5 of oil well pipe factory end 1 and contact in their connect, and the API standard is controlled with the J value, sees Fig. 1.
2, in order to improve the comprehensive switching performance of oil well pipe, such as sealability, join strength, torque resistant performance and bending resistance etc., there is human hair to understand the connection of the special thread of oil pipe, sleeve pipe, line pipe.But the male thread small end end face 5 of the on-the-spot end 2 of oil well pipe does not all have directly to contact with the male thread small end end face 5 of oil well pipe factory end 1, is that a torque resistant step by box cupling 3 box threads separates, and sees Fig. 2.
3, the buttress thread of the round thread of API and API, in connection, the male thread small end end face 5 of the male thread small end end face 5 of the on-the-spot end 2 of oil well pipe and oil well pipe factory end 1 separates with a pad 4, forms half special thread and connects, and sees Fig. 3.
4, the imagination that also has in the prior art the male thread small end end face 5 of a kind of male thread small end end face 5 with oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe to be in contact with one another, but owing to the thread pitch of thread pitch of the on-the-spot end 2 of oil well pipe not being arranged to greater than oil well pipe factory end 1, in use 1 the easy loosening and releasing of screw thread is held by oil well pipe factory, cause the oil field accident, therefore have no idea in actual use for a long time to promote.
Can not why the male thread small end end face 5 of the male thread small end end face 5 of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe directly contact in API is threaded? its reason is: during the Oil Field operation, (the box thread box cupling 3 of this moment maintains static the male thread small end end face 5 of the on-the-spot end 2 of oil well pipe when advancing in that the box thread of box cupling 3 turns clockwise relatively, the male thread of oil well pipe factory end 1 is free state simultaneously), as long as the male thread small end end face 5 of the on-the-spot end 2 of oil well pipe and the male thread small end end face 5 of oil well pipe factory end 1 occur to contact, will produce frictional force this moment in the contacting point, this frictional force will make namely oil well pipe of oil well pipe factory end 1(itself) relatively box thread (box thread box cupling 3 is motionless at this moment) be rotated counterclockwise, loosening the withdrawing from of male thread rotation with the original oil well pipe factory end 1 of in plant produced, tightening, make the oil well pipe thread Joint failure, cause the crushing accident that well is ruined.
There is following shortcoming in being threaded of above oil well pipe: 1, the comprehensive comparison that is threaded of API standard is poor; 2, special thread connects because box thread has an outstanding torque resistant step to make whole Thread Machining Process complicated, and processing cost is improved greatly.3, half special thread switching performance improve little, and the intermediate washer loss that comes off easily, Security is inadequate.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of inipple of oil well pipe is provided, to overcome technology prejudice, so that the male thread small end end face of the male thread small end end face of factory's end and the on-the-spot end of oil well pipe can directly contact, the combination properties such as the seal with screwed joint performance of oil well pipe, anti-stick button performance are better.
The technological scheme one that provides according to the utility model, the inipple of described oil well pipe, comprise oil well pipe factory end, the on-the-spot end of oil well pipe and box cupling, the end of oil well pipe factory end has male thread, the end of the on-the-spot end of oil well pipe also has male thread, box cupling has box thread, the male thread of oil well pipe factory end and the box thread of box cupling one end are spirally connected, the male thread of the on-the-spot end of oil well pipe and the box thread of the box cupling the other end are spirally connected, it is characterized in that: after utilizing box cupling that two oil well pipes are engaged, the oil well pipe factory end of an oil well pipe has the small end end face of male thread and the on-the-spot mutual close contact of small end end face with male thread of holding of oil well pipe of another root oil well pipe; And the male thread of the male thread of oil well pipe factory end and the on-the-spot end of oil well pipe is right-handed thread or left-handed thread simultaneously; The pitch of the male thread of oil well pipe factory end is less than the pitch of the male thread of the on-the-spot end of oil well pipe; Similarly, the pitch that is spirally connected less than the male thread with the on-the-spot end of oil well pipe of the pitch that is spirally connected of male thread of the box thread on the box cupling and oil well pipe factory end.
The connecting part of the box thread of two sections different pitch is provided for eliminating the breach of incomplete thread on box cupling, and the mutual close contact of male thread small end end face of the male thread small end end face of the on-the-spot end of oil well pipe and oil well pipe factory end forms axial interference fit.
Perhaps: the male thread small end of the on-the-spot end of oil well pipe comprises the first axial fitting surface and the second axial fitting surface, between the first axial fitting surface and the second axial fitting surface the first radial fit face is arranged; Correspondingly, the male thread small end of oil well pipe factory end also comprises the 3rd axial fitting surface and four-axial fitting surface, between the 3rd axial fitting surface and four-axial fitting surface the second radial fit face is arranged; Mutual close contact forms the first axial interference fit between the described first axial fitting surface and the 3rd axial fitting surface; Mutual close contact forms the second axial interference fit between the described second axial fitting surface and four-axial fitting surface; Mutual close contact between described the first radial fit face and the second radial fit face, forming radial interference or radial interference is main interference fit.
The technological scheme two that the utility model provides, a kind of inipple of oil well pipe, comprise oil well pipe factory end, the on-the-spot end of oil well pipe and box cupling, the end of oil well pipe factory end and the on-the-spot end of oil well pipe all has male thread, and box cupling has the box thread that cooperates with described male thread; The male thread of oil well pipe factory end and the box thread of box cupling one end are spirally connected, and the male thread of the on-the-spot end of oil well pipe and the box thread of the box cupling the other end are spirally connected; It is characterized in that: the small end end face that oil well pipe factory end has a male thread and the small end end face that the on-the-spot end of oil well pipe has male thread are mutual close contact after utilizing box cupling to engage, and the sense of rotation of the male thread held of the male thread of oil well pipe factory end and oil well pipe scene is opposite.
The connecting part of the box thread of two sections different pitch is provided for eliminating the breach of incomplete thread on box cupling, and the mutual close contact of male thread small end end face of the male thread small end end face of the on-the-spot end of oil well pipe and oil well pipe factory end forms axial interference fit.
Perhaps: the male thread small end of the on-the-spot end of oil well pipe comprises the first axial fitting surface and the second axial fitting surface, between the first axial fitting surface and the second axial fitting surface the first radial fit face is arranged; Correspondingly, the male thread small end of oil well pipe factory end also comprises the 3rd axial fitting surface and four-axial fitting surface, between the 3rd axial fitting surface and four-axial fitting surface the second radial fit face is arranged; Mutual close contact forms the first axial interference fit between the described first axial fitting surface and the 3rd axial fitting surface; Mutual close contact forms the second axial interference fit between the described second axial fitting surface and four-axial fitting surface; Mutual close contact between described the first radial fit face and the second radial fit face, forming radial interference or radial interference is main interference fit.
The utility model utilizes the pitch of oil well pipe factory end screw thread less than the pitch of the on-the-spot end of oil well pipe screw thread, overcome technology prejudice, so that the male thread small end end face of oil well pipe factory end holds male thread small end end face directly to contact with the oil well pipe scene, so that the connection sealing of oil well pipe can be better.
It is the API screw thread that the utility model is more paid attention to the on-the-spot end of oil well pipe male thread, the pitch of oil well pipe factory end screw thread is less than the pitch of the on-the-spot end of oil well pipe screw thread, utilize such screw thread to be connected with box cupling, more be conducive to the processing of oil field use and factory, huge use value and economic benefit are arranged.At this time will note: the length of a, box cupling is less than the coupling length of API; B, be complete thread (complete thread form) in the intersection of box cupling intermediate thread, if can not guarantee it is complete thread, will eliminate incomplete thread as shown in Figure 6 man-hour adding.
Oil well pipe described in the utility model is oil pipe, sleeve pipe or line pipe.
Description of drawings
Fig. 1 is the linkage structure schematic representation of existing API round thread and API buttress thread.
Fig. 2 is the structural representation that the special thread of existing oil pipe or sleeve pipe connects.
Fig. 3 is existing half special thread linkage structure schematic representation.
Fig. 4 is the utility model embodiment 1 structural representation.
Fig. 5 is the utility model embodiment 2 structural representation.
Fig. 6 is that the utility model box cupling is eliminated incomplete thread figure.
Fig. 7 is the amplification of Fig. 4 sealing surface.
Embodiment
The utility model is described in further detail below in conjunction with concrete drawings and Examples.
Embodiment 1
A kind of inipple of oil well pipe, comprise oil well pipe factory end 1, the on-the-spot end 2 of oil well pipe and box cupling 3, the end of oil well pipe factory end 1 has male thread, the end of the on-the-spot end 2 of oil well pipe also has male thread, box cupling 3 has box thread, the male thread of oil well pipe factory end 1 and the box thread of box cupling 3 one ends are spirally connected, the male thread of the on-the-spot end 2 of oil well pipe and the box thread of box cupling 3 the other ends are spirally connected, it is characterized in that: after utilizing box cupling 3 that two oil well pipes are engaged, the small end end face 5 that the oil well pipe factory end 1 of an oil well pipe has a male thread and the on-the-spot end 2 of the oil well pipe of another root oil well pipe have the mutual close contact of small end end face of male thread; And the male thread of the male thread of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe is right-handed thread or left-handed thread simultaneously; The pitch of the male thread of oil well pipe factory end 1 is less than the pitch of the male thread of the on-the-spot end 2 of oil well pipe; Similarly, the pitch that is spirally connected less than the male thread with the on-the-spot end 2 of oil well pipe of the pitch that is spirally connected of the box thread on the box cupling 3 and oil well pipe factory end 1 male thread.
Form axially, the concrete mode of radial interference fit is that the male thread small end of the on-the-spot end 2 of oil well pipe comprises the first axial fitting surface 7 and the second axial fitting surface 8, at the first axial fitting surface 7 and the second 8 of axial fitting surfaces the first radial fit face 9 is arranged; Correspondingly, the male thread small end of oil well pipe factory end 1 also comprises the 3rd axial fitting surface and four-axial fitting surface, between the 3rd axial fitting surface and four-axial fitting surface the second radial fit face is arranged; Mutual close contact forms the first axial interference fit between the described first axial fitting surface 7 and the 3rd axial fitting surface; Mutual close contact forms the second axial interference fit between the described second axial fitting surface 8 and four-axial fitting surface; Mutual close contact between described the first radial fit face 9 and the second radial fit face, forming radially or radially is main interference fit.What is called refers to as the master that take radial interference the magnitude of interference of radial fit face is greater than the magnitude of interference of axial fitting surface.
Another kind of mode is that the connecting part of the box thread of two sections different pitch is provided for eliminating the breach 6 of incomplete thread on box cupling 3.At this moment the male thread small end end face of the male thread small end end face of the on-the-spot end of oil well pipe and oil well pipe factory end all is the plane, only forms axial interference fit, does not have radial interference fit.
For example, " 5/8; wall thickness 11.99mm; grade of steel P110; box cupling 3 has box thread (thread pitch of box cupling 3 one ends is 6 tooth/inches, and the thread pitch of the other end is 5 tooth/inches), the male thread of oil well pipe factory end 1 is connected with the box thread of box cupling 3 one ends; the male thread of the on-the-spot end 2 of oil well pipe is connected with the box thread of box cupling 3 the other ends, and it is right-handed thread simultaneously that oil well pipe factory holds 1 male thread and oil well pipe scene to hold 2 male thread to be 9 in specification.The thread pitch of oil well pipe factory end 1 is 6 tooth/inches (4.23mm), the thread pitch of the on-the-spot end 2 of oil well pipe is 5 tooth/inches (5.08mm), the male thread small end end face 5 of the male thread small end end face 5 of the on-the-spot end 2 of oil well pipe and oil well pipe factory end 1 is mutual close contact, form two the 15 ° axial interference of step metallic sealing section, with one with the face diameter of the tapering metal sealing to interference, see Fig. 4 and Fig. 7.
A kind of inipple of oil well pipe comprises oil well pipe factory end 1, the on-the-spot end 2 of oil well pipe and box cupling 3, and the end of oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe all has male thread, and box cupling 3 has the box thread that cooperates with described male thread; The male thread of oil well pipe factory end 1 and the box thread of box cupling 3 one ends are spirally connected, and the male thread of the on-the-spot end 2 of oil well pipe and the box thread of box cupling 3 the other ends are spirally connected; It is characterized in that: the small end end face 5 that oil well pipe factory end 1 has a male thread and the on-the-spot end of the oil well pipe 2 small end end faces with male thread are mutual close contact after utilizing box cupling 3 to engage, and the male thread of oil well pipe factory end 1 and oil well pipe scene hold the sense of rotation of 2 male thread opposite.
Form axially, the concrete mode of radial interference fit is that the male thread small end of the on-the-spot end 2 of oil well pipe is drawn together the first axial fitting surface 7 and the second axial fitting surface 8, at the first axial fitting surface 7 and the second 8 of axial fitting surfaces the first radial fit face 9 is arranged; Correspondingly, the male thread small end of oil well pipe factory end 1 also comprises the 3rd axial fitting surface and four-axial fitting surface, between the 3rd axial fitting surface and four-axial fitting surface the second radial fit face is arranged; Mutual close contact forms the first axial interference fit between the described first axial fitting surface 7 and the 3rd axial fitting surface; Mutual close contact forms the second axial interference fit between the described second axial fitting surface 8 and four-axial fitting surface; Mutual close contact between described the first radial fit face 9 and the second radial fit face, forming radial interference or radial interference is main cooperation.What is called refers to as the master that take radial interference the magnitude of interference of radial fit face is greater than the magnitude of interference of axial fitting surface.
Another kind of mode is that the connecting part of the box thread of two sections different pitch is provided for eliminating the breach 6 of incomplete thread on box cupling 3.At this moment the male thread small end end face 5 of the male thread small end end face of the on-the-spot end of oil well pipe and oil well pipe factory end all is the plane, only forms axial interference fit, does not have radial interference fit.
For example, " 7/8; wall thickness 5.51mm; grade of steel P110, box cupling 3 has box thread, and the male thread of oil well pipe factory end 1 is connected with the box thread of box cupling 3 one ends; the male thread of the on-the-spot end 2 of oil well pipe is connected with the box thread of box cupling 3 the other ends; it is left-handed thread that 1 male thread is held by oil well pipe factory, and it is right-handed thread simultaneously that 2 male thread is held at the oil well pipe scene, and thread tooth is the triangle round thread to be 2 in specification.The pitch of the male thread of oil well pipe factory end 1 is 8 tooth/inches (3.175mm), the male thread pitch of the on-the-spot end 2 of oil well pipe is 8 tooth/inches (3.175mm), the male thread small end end face 5 of the male thread small end end face of the on-the-spot end 2 of oil well pipe and oil well pipe factory end 1 is 0 ° of step of an axial interference of formation of mutual close contact, sees Fig. 5.
The screw thread of the described oil well pipe of the application factory end 1 refers to the screw thread at manufacturer's connection coupling 3 and oil well pipe; The screw thread of the on-the-spot end 2 of oil well pipe refers to the screw thread when the use on-the-spot (such as the oil field) of oil well pipe is connected oil well pipe with box cupling 3.The male thread small end end face of the male thread small end end face 5 of described oil well pipe factory end 1 and the on-the-spot end 2 of oil well pipe refers to that (this end face can be the plane, also can be curved surface for the end face of oil well pipe; Can also two end faces be set respectively at the male thread small end of oil well pipe factory end 1 and the male thread small end of the on-the-spot end 2 of oil well pipe, form the aforesaid first axial fitting surface 7 and the second axial fitting surface 8, and at the first axial fitting surface 7 and the second 8 of axial fitting surfaces the first radial fit face 9 is set).Because the API thread section of oil well pipe is taper, so the large end end face of the male thread of this tapered thread section is an imaginary end face, and this large end end face is positioned at the mating face of tapered thread section and oil well pipe; The male thread small end end face of this tapered thread section generally is the end face that namely refers to above-mentioned oil well pipe.
The described oil well pipe of the application can be common steel tube; But be specially adapted to the used oil pipe in oil field, sleeve pipe or line pipe, because the length of this class pipe fitting is long, the moment of torsion that bears is large especially.In this application, when the male thread of the on-the-spot end of oil well pipe 2 ends was the API screw thread, the length of box cupling 3 was less than the length of the API box cupling of this specification.
Claims (10)
1. the inipple of an oil well pipe, comprise oil well pipe factory end (1), the on-the-spot end of oil well pipe (2) and box cupling (3), the end of oil well pipe factory end (1) has male thread, the end of the on-the-spot end of oil well pipe (2) also has male thread, box cupling (3) has box thread, the male thread of oil well pipe factory end (1) and the box thread of box cupling (3) one ends are spirally connected, the male thread of the on-the-spot end of oil well pipe (2) and the box thread of box cupling (3) the other end are spirally connected, it is characterized in that: after utilizing box cupling (3) that two oil well pipes are engaged, the oil well pipe factory end (1) of an oil well pipe has the small end end face (5) and the on-the-spot mutual close contact of small end end face of holding (2) to have male thread of the oil well pipe of another root oil well pipe of male thread; And the male thread of the on-the-spot end of the male thread of oil well pipe factory end (1) and oil well pipe (2) is right-handed thread or left-handed thread simultaneously; The pitch of the male thread of oil well pipe factory end (1) is less than the pitch of the male thread of the on-the-spot end of oil well pipe (2); Similarly, the pitch that is spirally connected less than the male thread with the on-the-spot end of oil well pipe (2) of the pitch that is spirally connected of male thread of the box thread on the box cupling (3) and oil well pipe factory end (1).
2. the inipple of described oil well pipe according to claim 1, it is characterized in that: the male thread small end end face (5) of the male thread small end end face of the on-the-spot end of oil well pipe (2) and oil well pipe factory end (1) is close contact mutually, forms axial interference fit.
3. the inipple of described oil well pipe according to claim 1, it is characterized in that: the male thread small end of the on-the-spot end of oil well pipe (2) comprises the first axial fitting surface (7) and the second axial fitting surface (8), between the first axial fitting surface (7) and the second axial fitting surface (8) the first radial fit face (9) is arranged; Correspondingly, the male thread small end of oil well pipe factory end (1) also comprises the 3rd axial fitting surface and four-axial fitting surface, between the 3rd axial fitting surface and four-axial fitting surface the second radial fit face is arranged; Mutual close contact forms the first axial interference fit between the described first axial fitting surface (7) and the 3rd axial fitting surface; Mutual close contact forms the second axial interference fit between the described second axial fitting surface (8) and four-axial fitting surface; Mutual close contact between described the first radial fit face (9) and the second radial fit face, forming radial interference or radial interference is main interference fit.
4. the inipple of described oil well pipe according to claim 1 is characterized in that: the breach (6) that is provided for eliminating incomplete thread in the connecting part of the box thread of the upper two sections different pitch of box cupling (3).
5. the inipple of an oil well pipe, comprise oil well pipe factory end (1), the on-the-spot end of oil well pipe (2) and box cupling (3), the end of the on-the-spot end of oil well pipe factory end (1) and oil well pipe (2) all has male thread, and box cupling (3) has the box thread that cooperates with described male thread; The male thread of oil well pipe factory end (1) and the box thread of box cupling (3) one ends are spirally connected, and the male thread of the on-the-spot end of oil well pipe (2) and the box thread of box cupling (3) the other end are spirally connected; It is characterized in that: small end end face that the small end end face (5) that oil well pipe factory end (1) has a male thread and the on-the-spot end of oil well pipe (2) have a male thread is mutual close contact after utilizing box cupling (3) to engage, and the male thread of oil well pipe factory end (1) and oil well pipe scene hold the sense of rotation of male thread of (2) opposite.
6. the inipple of described oil well pipe according to claim 5, it is characterized in that: the male thread small end end face (5) of the male thread small end end face of the on-the-spot end of oil well pipe (2) and oil well pipe factory end (1) is close contact mutually, forms axial interference fit.
7. the inipple of described oil well pipe according to claim 5, it is characterized in that: the male thread small end of the on-the-spot end of oil well pipe (2) comprises the first axial fitting surface (7) and the second axial fitting surface (8), between the first axial fitting surface (7) and the second axial fitting surface (8) the first radial fit face (9) is arranged; Correspondingly, the male thread small end of oil well pipe factory end (1) also comprises the 3rd axial fitting surface and four-axial fitting surface, between the 3rd axial fitting surface and four-axial fitting surface the second radial fit face is arranged; Mutual close contact forms the first axial interference fit between the described first axial fitting surface (7) and the 3rd axial fitting surface; Mutual close contact forms the second axial interference fit between the described second axial fitting surface (8) and four-axial fitting surface; Mutual close contact between described the first radial fit face (9) and the second radial fit face (9), forming radial interference or radial interference is main interference fit.
8. the inipple of described oil well pipe according to claim 5 is characterized in that: the breach (6) that is provided for eliminating incomplete thread in the connecting part of the box thread of the upper two sections different pitch of box cupling (3).
9. according to claim 1 or the inipple of 5 described oil well pipes, it is characterized in that: when the male thread of the on-the-spot end of oil well pipe (2) end was the API screw thread, the length of box cupling (3) was less than the length of the API box cupling of this specification.
10. according to claim 1 or the inipple of 5 described oil well pipes, it is characterized in that: described oil well pipe is oil pipe, sleeve pipe or line pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220342668 CN202769105U (en) | 2012-07-13 | 2012-07-13 | Threaded joint of oil well pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220342668 CN202769105U (en) | 2012-07-13 | 2012-07-13 | Threaded joint of oil well pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202769105U true CN202769105U (en) | 2013-03-06 |
Family
ID=47775680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220342668 Expired - Lifetime CN202769105U (en) | 2012-07-13 | 2012-07-13 | Threaded joint of oil well pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202769105U (en) |
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2012
- 2012-07-13 CN CN 201220342668 patent/CN202769105U/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130306 |