CN202597467U - Closed type hydrostatic guideway - Google Patents
Closed type hydrostatic guideway Download PDFInfo
- Publication number
- CN202597467U CN202597467U CN2012201230666U CN201220123066U CN202597467U CN 202597467 U CN202597467 U CN 202597467U CN 2012201230666 U CN2012201230666 U CN 2012201230666U CN 201220123066 U CN201220123066 U CN 201220123066U CN 202597467 U CN202597467 U CN 202597467U
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- guide rail
- slide carriage
- rail body
- guide
- pedestal
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Abstract
The utility model discloses a closed type hydrostatic guidway which comprises slide carriages, a guideway body and a substrate base. The slide carriages comprise an upper slide carriage, two side slide carriages and two lower slide carriages, wherein the two side slide carriages are respectively and fixedly connected to two ends of the upper slide carriage, and the two lower slide carriages are respectively and fixedly connected with the two side slide carriages so that a T-shaped groove is formed. The guideway body is arranged in the T-shaped groove and is fixedly connected with the substrate seat. Lubricating clearance is formed between the lower guide face of the guideway body and upper surfaces of the lower slide carriages. Lubricating clearance is formed between the guide face of the substrate seat and lower surfaces of the lower slide carriages. Lubricating clearance is formed between two side guide faces of the guideway body and inner side faces of the two side slide carriages. Flow controllers and runners for fluid media are arranged inside the slide carriages. The fluid media flow into the lubricating clearance through the runners and the flow controllers, so that the closed type hydrostatic guideway is formed.
Description
Technical field
The utility model relates to a kind of enclosed hydrostatic pressure guide rail.
Background technique
The hydrostatic pressure guide rail is a kind of non-contact type guide rail, and it utilizes for example air of flowing medium, lubricant oil, or other fluid obtains bearing capacity through throttling action.Hydrostatic bearing has advantages such as precision height, little, the good stability of vibration, therefore is widely used in accurate and fields such as ultraprecise processing, detection.Principles such as that the design of hydrostatic pressure guide rail should be followed is simple in structure, the component distortion is little are to improve precision and stability as much as possible.The hydrostatic pressure guide rail is generally by the guide rail body that is connected on the pedestal; And be suspended in the slide carriage of doing straight line or curvilinear motion on the guide rail body through flowing medium and form; Usually also be provided with runner and the flow controller that supplies flowing medium to flow in the slide carriage; The gap that between the guide surface of guide rail body and corresponding slide carriage surface, has the carrying current body medium, flowing medium be through behind the runner that is provided with in the slide carriage and the flow controller, gets into guide rail body guide surface and the gap between the slide carriage surface accordingly; But form the fluid film of bearing load, fluid film is suspended in slide carriage on the guide rail body.
Fig. 1 shows a kind of T type hydrostatic pressure guide rail structure figure of routine; Comprise slide carriage 1, guide rail body 11 and pedestal 10; Described slide carriage 1 comprises slide carriage 14, two side slide carriages 13 and two following slide carriages 12; Wherein two side slide carriages 13 are connected in the two ends of slide carriage 14 respectively, thereby two following slide carriages 12 are connected with two side slide carriages 13 respectively and form T type groove 15; Described guide rail body 11 is arranged in the T type groove 15, and guide rail body 11 is connected with pedestal 10 through guide rail body attachment face 11d mutually, is provided with the space 111 that is used to install linear electric motor or feed screw nut in the guide rail body 11.In this hydrostatic pressure guide rail; On the guide rail body under guide surface 11c, the guide rail body guide surface 11a and two guide rail body side guide surface 11b as carrying and guide surface; And form the lubrication gap with the respective surfaces of slide carriage 1; Be specially: guide surface 11a forms the lubrication gap in opposite directions with following slide carriage upper surface 12a under the guide rail body; Guide surface 11c and last slide carriage lower surface 14c form the lubrication gap in opposite directions on the guide rail body; Two guide rail body side guide surface 11b form the lubrication gap with two side slide carriage inner side surface 13b respectively in opposite directions, and flowing medium gets into the lubrication gap and forms fluid film (runner and flow controller at length are not shown among the figure, and the arrow group of just utilizing per three arrows to constitute one group is represented the flow direction of flowing medium); Under the effect of fluid film pressure slide carriage 1 is being suspended on the guide rail body 11 non-contactly, is constituting enclosed hydrostatic pressure guide rail; And between slide carriage lower surface 12d and the pedestal upper surface 10d enough distances are arranged under must guaranteeing, rub to prevent down slide carriage lower surface 12d and pedestal upper surface 10d.Chinese patent CN101249612 is disclosed to be exactly this hydrostatic pressure guide rail; But the stressed mechanical characteristic of the slide carriage 1 of the hydrostatic pressure guide rail of this routine is not fine; Except the suffered fluid medium pressure of side slide carriage inner side surface 13b can cause the outside dilatating and deformable of side slide carriage 13; The suffered fluid medium pressure of following slide carriage upper surface 12a also can further increase the outside dilatating and deformable amount of side slide carriage 13; And the suffered fluid medium pressure of slide carriage upper surface 12a also can cause down slide carriage 12 downward dilatating and deformables down, thereby cause the loss and the poor stability of precision.
Summary of the invention
The purpose of the utility model provides and a kind ofly can reduce side slide carriage and the distortion of following slide carriage, structure stability is good, precision is high hydrostatic pressure guide rail, is used to solve the side slide carriage of existing hydrostatic pressure guide rail and the problem of following slide carriage easy deformation and precision stability difference.
A kind of technological scheme that the utility model technical solution problem is taked is: a kind of enclosed hydrostatic pressure guide rail; It comprises slide carriage, guide rail body and pedestal; Described slide carriage comprises slide carriage, two side slide carriages and two following slide carriages; Two side slide carriages are connected in the two ends of slide carriage respectively, thereby two following slide carriages are connected with two side slide carriages respectively and form T type groove; Described guide rail body is arranged in this T type groove, and guide rail body is connected with pedestal with the pedestal attachment face through the guide rail body attachment face mutually, can be provided with the space that is used to install linear electric motor or feed screw nut in the guide rail body.
The utility model utilizes under the guide rail body guide surface and guide rail body side guide surface and foot guide face as carrying and guide surface; Guide surface forms the lubrication gap in opposite directions with following slide carriage upper surface under the guide rail body; Following slide carriage is provided with flow controller and to this lubrication gap flowing medium is provided; The foot guide face forms the lubrication gap in opposite directions with following slide carriage lower surface, and following slide carriage is provided with flow controller and to this lubrication gap flowing medium is provided, and guide rail body side guide surface and side slide carriage inner side surface form the lubrication gap in opposite directions; The side slide carriage is provided with flow controller and to this lubrication gap flowing medium is provided; Fluid inlet opening and the runner that is connected with said flow controller is set in the slide carriage, and flowing medium gets in the lubrication gap from fluid inlet opening, runner and flow controller, forms the closed type static pressure fluid rail.Said pedestal is provided with the surface that is lower than the foot guide face.
The utility model guide rail body upper surface is as carrying and guide surface, and itself and last slide carriage lower surface are provided with enough distances and are in contact with one another preventing.
In the utility model, when guide surface under the said guide rail body and said guide rail body attachment face not during coplane, then guide surface is higher than the guide rail body attachment face under the guide rail body, and said foot guide face and said pedestal attachment face coplane; When guide surface under the guide rail body and guide rail body attachment face coplane, pedestal attachment face and foot guide face coplane not then, and the pedestal attachment face is higher than the foot guide face.The described flow controller of the utility model can be orifice restriction device, slit flow controller, porous matter flow controller, capillary restrictor and film feedback-throttling device etc.The described lubrication gap of the utility model is generally more than 2 microns, below 100 microns, according to the different lubrication gap of the different choice of throttle style and lubricant medium to reach high bearing capacity and rigidity.The described flowing medium of the utility model can be gas or liquid, and for example air, lubricated wet goods if lubricant medium is a gas, can be provided with balancing slit in the flow controller outlet port; If lubricant medium is a liquid, then toward contact oil pocket need be set in the flow controller outlet port, also oil-return groove need be set in case of necessity.
The utility model utilizes the foot guide face to carry and guide surface as one; Lubricant medium pressure between foot guide face and the following slide carriage lower surface; Not only can bear the load of above-below direction; The more important thing is can the balance guide rail body under fluid medium pressure between guide surface and the following slide carriage upper surface; Thereby reduce downward dilatating and deformable amount and the outside dilatating and deformable amount of side slide carriage of following slide carriage that produce by fluid medium pressure between guide surface under the guide rail body and the following slide carriage upper surface, thereby improve precision and stability.
The another kind of technological scheme that the utility model technical solution problem is taked is: a kind of enclosed hydrostatic pressure guide rail; Comprise slide carriage, guide rail body and pedestal; Described slide carriage comprises slide carriage, two side slide carriages; Wherein thereby two side slide carriages two ends of being connected in slide carriage respectively form the V-type groove; Described guide rail body is arranged in this V-type groove, and guide rail body is connected with pedestal with the pedestal attachment face through the guide rail body attachment face mutually, can be provided with the space that is used to install linear electric motor or feed screw nut in the guide rail body.
Guide rail body inclined side guide surface and side slide carriage inner side surface form the lubrication gap in opposite directions; The side slide carriage is provided with flow controller and to this lubrication gap flowing medium is provided; Foot guide face and side slide carriage lower surface form the lubrication gap in opposite directions; The side slide carriage is provided with flow controller and to this lubrication gap flowing medium is provided; Be provided with the fluid inlet opening and the runner that are connected with said flow controller in the slide carriage, flowing medium gets into described lubrication gap from fluid inlet opening, runner and flow controller, forms enclosed hydrostatic pressure guide rail.
Said foot guide face and said pedestal attachment face coplane.
Said pedestal is provided with the surface that is lower than the foot guide face.
Said flow controller can be orifice restriction device, slit flow controller, porous matter flow controller, capillary restrictor and film feedback-throttling device etc.
The utility model utilizes the foot guide face to carry and guide surface as one; Lubricant medium pressure between foot guide face and the side slide carriage lower surface; Not only can bear the load of above-below direction; The more important thing is can balance guide rail body inclined side guide surface and side slide carriage inner side surface between fluid medium pressure at the component of above-below direction, thereby reduce the outside and downward dilatating and deformable amount of side slide carriage, thereby improve precision and stability.
The utility model can be used for accurate ultra working machine tool and detection facility field, also can be used for electronics manufacturing and encapsulation field, but is not limited to above-mentioned field.
Description of drawings
Fig. 1 shows the structural drawing of conventional enclosed hydrostatic pressure guide rail;
Fig. 2 A shows the 3-D view of the T type enclosed hydrostatic pressure guide rail of one of the utility model specific embodiment;
Fig. 2 B shows the K-K cross-sectional view according to Fig. 2 A of the utility model;
Fig. 2 C shows the another kind of mode of execution of the T type enclosed hydrostatic pressure guide rail of one of the utility model specific embodiment;
Fig. 2 D shows the another kind of mode of execution of the T type enclosed hydrostatic pressure guide rail of one of the utility model specific embodiment;
Fig. 3 A shows the 3-D view of the V-type enclosed hydrostatic pressure guide rail of one of the utility model specific embodiment;
Fig. 3 B shows the S-S cross-sectional view according to Fig. 3 A of the utility model.
Embodiment
Below through concrete embodiment and combine accompanying drawing that the utility model is described in further detail.
Embodiment one, Fig. 2 A and Fig. 2 B show a kind of specific embodiment based on the T type enclosed hydrostatic pressure guide rail of the utility model; Comprise slide carriage 2, guide rail body 21 and pedestal 20; Said slide carriage 2 comprises slide carriage 24, two side slide carriages 23 and two following slide carriages 22; Wherein two side slide carriages 23 are connected in the two ends of slide carriage 24 respectively, thereby two following slide carriages 22 are connected with two side slide carriages 23 respectively and form T type groove 25; Described guide rail body 21 is arranged in this T type groove 25; Guide rail body 21 is connected with pedestal 20 with pedestal attachment face 20h through guide rail body attachment face 21h mutually, can be provided with the space 211 that is used to install linear electric motor or feed screw nut in the guide rail body 21.
The characteristic of the T type enclosed hydrostatic pressure guide rail among this embodiment is: utilize under the guide rail body guide surface 21a and two guide rail body side guide surface 21b and foot guide face 20d as carrying and guide surface; Guide rail body upper surface 21c is as carrying and guide surface, and itself and last slide carriage lower surface 24c are provided with enough distances and are in contact with one another preventing; Guide surface 21a forms the lubrication gap in opposite directions with following slide carriage upper surface 22a under the guide rail body; Following slide carriage (22) is provided with flow controller (222) and to this lubrication gap flowing medium is provided; Foot guide face 20d and following slide carriage lower surface 22d form the lubrication gap in opposite directions; Following slide carriage (22) is provided with flow controller (221) and to this lubrication gap flowing medium is provided; Guide rail body side guide surface 21b and side slide carriage inner side surface 23b form the lubrication gap in opposite directions, and side slide carriage (23) is provided with flow controller (231) and to this lubrication gap flowing medium is provided; Be provided with the fluid inlet opening 232 and the runner L that are connected with flow controller 221,222 and 231 in the slide carriage 2, flowing medium forms the closed type static pressure fluid rail in fluid inlet opening 232, runner L and the described lubrication gap of flow controller 221,222,231 entering.In addition, pedestal (20) is provided with the surface (20e) that is lower than foot guide face (20d).
In the present embodiment, guide surface 21a and guide rail body attachment face 21h coplane not under the guide rail body, and guide surface 21a is higher than guide rail body attachment face 21h under the guide rail body; Foot guide face 20d and pedestal attachment face 20h coplane.
If desired, flow controller also can be set on following slide carriage side 22f be connected, make to form the lubrication gap between guide rail body downside 21f and the following slide carriage side 22f with corresponding runner and with fluid inlet opening 232.
Embodiment two, this mode of execution of combination Fig. 2 C explanation, in this mode of execution, L type slide carriage 29 is the integrated design, and it is corresponding to side slide carriage in the embodiment one 23 and following slide carriage 22, and other structure is identical with embodiment one.
Embodiment three, this mode of execution of combination Fig. 2 D explanation, in this mode of execution, pedestal 200 is corresponding to the pedestal in the embodiment one 20, and guide rail body 210 is corresponding to the guide rail body in the embodiment one 21; In this mode of execution, foot guide face 200d and pedestal attachment face 200h be coplane not, and pedestal attachment face 200h is higher than foot guide face 200d, guide surface 210a and guide rail body attachment face 210h coplane under the guide rail body; Other structure is identical with embodiment one.
Embodiment four, combination Fig. 3 A and this mode of execution of 3B explanation; This mode of execution is a kind of V-type enclosed hydrostatic pressure guide rail; Comprise slide carriage 3, guide rail body 31 and pedestal 30; Described slide carriage 3 comprises slide carriage 34 and two side slide carriages 33, thereby wherein two side slide carriages 33 two ends of being connected in slide carriage 34 respectively form V-type groove 35, and described guide rail body 31 is arranged in this V-type groove 35; Guide rail body 31 is connected with pedestal 30 with pedestal attachment face 30h through guide rail body attachment face 31h mutually, can be provided with the space 311 that is used to install linear electric motor or feed screw nut in the guide rail body 31.
The characteristic of the V-type enclosed hydrostatic pressure guide rail in the present embodiment is: utilize two guide rail body inclined side guide surface 31b and foot guide face 30d as carrying and guide surface; Guide rail body upper surface 31c is as carrying and guide surface, and itself and last slide carriage lower surface 34c are provided with enough distances and are in contact with one another preventing; Guide rail body inclined side guide surface 31b and side slide carriage inner side surface 33b form the lubrication gap in opposite directions; Side slide carriage 33 is provided with flow controller 332 and to this lubrication gap flowing medium is provided; Foot guide face 30d and side slide carriage lower surface 33d form the lubrication gap in opposite directions, and side slide carriage 33 is provided with flow controller 331 and to this lubrication gap flowing medium is provided; Be provided with the fluid inlet opening 333 and runner Q that are connected with flow controller 331 and 332 in the slide carriage 3, flowing medium forms the closed type static pressure fluid rail in fluid inlet opening 333, runner Q and flow controller 331,332 entering lubrication gaps.In addition, pedestal 30 is provided with the surperficial 30e that is lower than foot guide face 30d.
In the present embodiment, foot guide face 30d and pedestal attachment face 30h coplane.
The foregoing description is not the restriction to the utility model, and those skilled in the art draw various mode of executions through the utility model, dimensional changes for example, and outer shape structure, the variation of arranging, material replacement etc. all belong to the utility model protection domain.
Claims (7)
1. enclosed hydrostatic pressure guide rail; It is characterized in that: comprise slide carriage (2), guide rail body (21) and pedestal (20); Said slide carriage (2) comprises slide carriage (24), two side slide carriages (23) and two following slide carriages (22); Said two side slide carriages (23) are connected in said two ends, said two the following slide carriages (22) of going up slide carriage (24) respectively and are connected with said two side slide carriages (23) respectively and form T type groove (25); Said guide rail body (21) is arranged in this T type groove (25), and said guide rail body (21) is connected with said pedestal (20) with pedestal attachment face (20h) through guide rail body attachment face (21h) mutually;
Guide surface under the guide rail body (21a) forms the lubrication gap in opposite directions with following slide carriage upper surface (22a); Said slide carriage (22) down is provided with flow controller (222) provides flowing medium to this lubrication gap; Foot guide face (20d) forms the lubrication gap in opposite directions with following slide carriage lower surface (22d); Said slide carriage (22) down is provided with flow controller (221) provides flowing medium to this lubrication gap; Guide rail body side guide surface (21b) forms the lubrication gap in opposite directions with side slide carriage inner side surface (23b); Said side slide carriage (23) is provided with flow controller (231) and to this lubrication gap flowing medium is provided, and is provided with the fluid inlet opening (232) and the runner (L) that are interconnected with said flow controller (221), (222) and (231) in the said slide carriage (2).
2. enclosed hydrostatic pressure guide rail according to claim 1; It is characterized in that; When guide surface (21a) under the said guide rail body and said guide rail body attachment face (21h) not during coplane; Then guide surface (21a) is higher than guide rail body attachment face (21h) under the guide rail body, and said foot guide face (20d) and said pedestal attachment face (20h) coplane; When guide surface under the guide rail body (21a) and guide rail body attachment face (21h) coplane, pedestal attachment face (20h) and foot guide face (20d) coplane not then, and pedestal attachment face (20h) is higher than foot guide face (20d).
3. enclosed hydrostatic pressure guide rail according to claim 1 is characterized in that, said pedestal (20) is provided with the surface (20e) that is lower than said foot guide face (20d).
4. enclosed hydrostatic pressure guide rail; It is characterized in that: comprise slide carriage (3), guide rail body (31) and pedestal (30); Said slide carriage (3) comprises slide carriage (34) and two side slide carriages (33); Said two side slide carriages (33) be connected in respectively said go up slide carriage (34) thus two ends form V-type groove (35), said guide rail body (31) is arranged in this V-type groove (35), said guide rail body (31) is connected with said pedestal (30) with pedestal attachment face (30h) through guide rail body attachment face (31h) mutually;
Guide rail body inclined side guide surface (31b) forms the lubrication gap in opposite directions with side slide carriage inner side surface (33b); Said side slide carriage (33) is provided with flow controller (332) and to this lubrication gap flowing medium is provided; Foot guide face (30d) forms the lubrication gap in opposite directions with side slide carriage lower surface (33d); Said side slide carriage (33) is provided with flow controller (331) and to this lubrication gap flowing medium is provided, and is provided with the fluid inlet opening (333) and the runner (Q) that are connected with said flow controller (331) and (332) in the said slide carriage (3).
5. enclosed hydrostatic pressure guide rail according to claim 4 is characterized in that, said pedestal (30) is provided with the surface (30e) that is lower than said foot guide face (30d).
6. according to claim 1 and 4 described enclosed hydrostatic pressure guide rails, it is characterized in that described flow controller can be orifice restriction device, slit flow controller, porous matter flow controller, capillary restrictor and film feedback-throttling device etc.
7. according to claim 1 and 4 described enclosed hydrostatic pressure guide rails, it is characterized in that described flowing medium is gas or liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201230666U CN202597467U (en) | 2012-03-28 | 2012-03-28 | Closed type hydrostatic guideway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201230666U CN202597467U (en) | 2012-03-28 | 2012-03-28 | Closed type hydrostatic guideway |
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| CN202597467U true CN202597467U (en) | 2012-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012201230666U Expired - Fee Related CN202597467U (en) | 2012-03-28 | 2012-03-28 | Closed type hydrostatic guideway |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720763A (en) * | 2012-03-28 | 2012-10-10 | 哈尔滨工业大学深圳研究生院 | Closed fluid hydrostatic guiderail |
| CN104482046A (en) * | 2014-11-26 | 2015-04-01 | 广东工业大学 | Easily-adjusting and easily-measuring high-precision closed type constant-pressure static-pressure guide rail throttling device |
| CN104482048A (en) * | 2014-12-09 | 2015-04-01 | 常州华威新材料有限公司 | Static pressure air guide track |
| CN105458733A (en) * | 2015-12-18 | 2016-04-06 | 湖北九洲数控机床有限责任公司 | Two-way closed static-pressure guideway |
| CN107061497A (en) * | 2017-04-19 | 2017-08-18 | 西安工业大学 | A kind of high-precision interferometer gas-static snubber base |
| CN109139697A (en) * | 2017-06-28 | 2019-01-04 | 上工业股份有限公司 | Hydrostatic slider device |
| US10465746B2 (en) | 2017-02-22 | 2019-11-05 | Team Corporation | Vibration test fixture |
| CN111486176A (en) * | 2019-01-25 | 2020-08-04 | 上银科技股份有限公司 | Hydrostatic linear slide rail |
| CN112548595A (en) * | 2020-12-25 | 2021-03-26 | 中国工程物理研究院机械制造工艺研究所 | Series composite throttling closed type hydrostatic guide rail |
-
2012
- 2012-03-28 CN CN2012201230666U patent/CN202597467U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720763A (en) * | 2012-03-28 | 2012-10-10 | 哈尔滨工业大学深圳研究生院 | Closed fluid hydrostatic guiderail |
| CN104482046B (en) * | 2014-11-26 | 2017-01-25 | 广东工业大学 | Easily-adjusting and easily-measuring high-precision closed type constant-pressure static-pressure guide rail throttling device |
| CN104482046A (en) * | 2014-11-26 | 2015-04-01 | 广东工业大学 | Easily-adjusting and easily-measuring high-precision closed type constant-pressure static-pressure guide rail throttling device |
| CN104482048A (en) * | 2014-12-09 | 2015-04-01 | 常州华威新材料有限公司 | Static pressure air guide track |
| CN105458733B (en) * | 2015-12-18 | 2018-09-18 | 湖北九洲数控机床有限责任公司 | A kind of double track closed hydrostatic slideway |
| CN105458733A (en) * | 2015-12-18 | 2016-04-06 | 湖北九洲数控机床有限责任公司 | Two-way closed static-pressure guideway |
| US10465746B2 (en) | 2017-02-22 | 2019-11-05 | Team Corporation | Vibration test fixture |
| CN107061497A (en) * | 2017-04-19 | 2017-08-18 | 西安工业大学 | A kind of high-precision interferometer gas-static snubber base |
| CN107061497B (en) * | 2017-04-19 | 2019-01-01 | 西安工业大学 | A kind of high-precision interferometer gas-static snubber base |
| CN109139697A (en) * | 2017-06-28 | 2019-01-04 | 上工业股份有限公司 | Hydrostatic slider device |
| CN111486176A (en) * | 2019-01-25 | 2020-08-04 | 上银科技股份有限公司 | Hydrostatic linear slide rail |
| CN111486176B (en) * | 2019-01-25 | 2021-08-31 | 上银科技股份有限公司 | Hydrostatic linear slide rail |
| CN112548595A (en) * | 2020-12-25 | 2021-03-26 | 中国工程物理研究院机械制造工艺研究所 | Series composite throttling closed type hydrostatic guide rail |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121212 Termination date: 20130328 |