US20120031704A1 - Device for spray lubrication of a wind turbine transmission - Google Patents

Device for spray lubrication of a wind turbine transmission Download PDF

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Publication number
US20120031704A1
US20120031704A1 US13/191,504 US201113191504A US2012031704A1 US 20120031704 A1 US20120031704 A1 US 20120031704A1 US 201113191504 A US201113191504 A US 201113191504A US 2012031704 A1 US2012031704 A1 US 2012031704A1
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United States
Prior art keywords
oil
spray
housing
temperature
transmission
Prior art date
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Abandoned
Application number
US13/191,504
Inventor
Michaela Brasseur
Cong Nguyen
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Siemens AG
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Siemens AG
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Filing date
Publication date
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Assigned to SIEMENS AKTIENGESELLSCHAFT reassignment SIEMENS AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Brasseur, Michaela, NGUYEN, CONG
Publication of US20120031704A1 publication Critical patent/US20120031704A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N7/00—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated
    • F16N7/30—Arrangements for supplying oil or unspecified lubricant from a stationary reservoir or the equivalent in or on the machine or member to be lubricated the oil being fed or carried along by another fluid
    • F16N7/32—Mist lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D9/00—Stators
    • F01D9/06—Fluid supply conduits to nozzles or the like
    • F01D9/065—Fluid supply or removal conduits traversing the working fluid flow, e.g. for lubrication-, cooling-, or sealing fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • F03D80/70—Bearing or lubricating arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0458—Oil-mist or spray lubrication; Means to reduce foam formation
    • F16H57/046—Oil-mist or spray lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/048—Type of gearings to be lubricated, cooled or heated
    • F16H57/0493—Gearings with spur or bevel gears
    • F16H57/0495—Gearings with spur or bevel gears with fixed gear ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/02—Turbines
    • F16N2210/025—Wind Turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2210/00—Applications
    • F16N2210/12—Gearings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to a device and a method for spray lubrication of a wind turbine transmission.
  • oil injection or oil spray devices are used, which squirt or spray the wind turbine transmission with oil shortly prior to its being put back into service, in order to moisten the metal surfaces with a film of oil. Nevertheless, a relatively large number of wind turbine transmissions fail shortly after restart due to inadequate moistening of metal parts with oil.
  • the object of the present invention is thus to propose a device for spray lubrication of a wind turbine transmission, which enables improved spray lubrication of the transmission parts.
  • the present invention relates to a device for spray lubrication of a wind turbine transmission.
  • the device comprises a transmission enclosed in a housing, a first oil spray unit and a second oil spray unit. Both oil spray units are arranged in the interior of the housing.
  • the first oil spray unit is embodied to spray oil at a first temperature in the interior of the transmission housing and the second oil spray unit is embodied to spray oil at a second temperature in the interior of the transmission housing.
  • the first temperature and the second temperature differ from each other here.
  • the present invention additionally relates to a method for spray lubrication of a wind turbine transmission arranged in a housing, in which at least two oils, which differ from each other in their temperature, are sprayed into the housing.
  • the inventive device and the inventive method have the advantage that the oil particles of the sprayed-in oil move differently because of their different temperature, and thereby distribute themselves better within the housing. This leads to a more even moistening of the transmission parts and thus to better lubrication compared with known devices and methods of this kind.
  • the temperature difference of the sprayed-in oils is here selected in such a way that some of the oil particles rise according to the temperature in the housing and some of the oil particles sink according to the temperature in the housing.
  • the ascending and descending of the oil particles is likewise supported by a corresponding arrangement of the spray units.
  • FIG. 1 shows the inventive device for spray lubrication of a wind turbine transmission in schematic form.
  • the inventive device comprises a transmission, which is represented schematically in FIG. 1 with two spur wheels G 1 , G 2 , two transmission shafts W 1 , W 2 and four bearings L 1 , L 2 , L 3 , L 4 .
  • the transmission G 1 , G 2 , W 1 , W 2 , L 1 , L 2 , L 3 , L 4 is enclosed by a transmission housing, which is not shown.
  • the inventive device further comprises two oil spray devices OS 1 , OS 2 , which together form an oil spray system.
  • the oil spray devices OS 1 , OS 2 are arranged spatially separated from each other on the transmission housing, specifically in such a way that at least their spray head is located within the housing.
  • the oil spray devices OS 1 , OS 2 are attached to the inside of the transmission housing.
  • the two oil spray devices OS 1 , OS 2 create oil particles of different diameters.
  • the oil spray devices are embodied in such a way that they spray oil particles with a diameter in the range of 1 ⁇ m to 20 ⁇ m.
  • the oil to be sprayed is pre-heated, in order to attain the desired viscosity. It is then pumped through the oil spray devices OS 1 , OS 2 . It is important here that oil is sprayed out of the oil spray devices at a different temperature.
  • the oil spray devices (OS 1 , OS 2 ) can be arranged at different places on the transmission housing, and spray oil on the transmission from different angles. It is however particularly advantageous if a first oil spray device (OS 1 ) is arranged above and a second oil spray device (OS 2 ) below the moving parts and the oil is sprayed vertically downwards or, as the case may be upwards, in the direction of the transmission parts, in order to achieve a good mixing of the oil particles.
  • the first oil spray device (OS 1 ) is arranged above the moving parts. It sprays an oil whose temperature lies below the temperature of the oil being sprayed by the second oil spray device. This means that the upper oil spray device sprays the comparatively “cooler” oil.
  • the second oil spray device (OS 1 ) is arranged below the moving parts of the transmission. It sprays an oil whose temperature lies above the temperature of the oil being sprayed by the first oil spray device (OS 2 ). This means that the lower oil spray device sprays an oil with a comparatively “higher” temperature.
  • FIG. 1 the rising of the oil particles with the “higher” temperature as a “heat flow” is indicated by arrows WS pointing upwards.
  • the oil particles sprayed by the first and second oil spray device mix in the interior of the transmission housing.
  • an oil mist arises which changes its position within the transmission housing dynamically.
  • this “oil mist” ON is illustrated by arrows arranged in a circle.
  • the temperature difference between the first and second temperature is here selected in such a way that some of the oil particles of the sprayed oil rise and some of the oil particles of the sprayed oil sink, so that the oil mist (ON) forming as a result of the mixing of these ascending and descending oil particles changes its position in the interior of the housing.
  • the temperature difference between the first and second temperature lies in the range 40° C. to 60° C.
  • an oil at a temperature of 40° C. is sprayed by the first oil spray unit (OS 1 ), while an oil at a temperature of 90° C. is sprayed by the second oil spray unit (OS 2 ).
  • the described inventive device and the inventive method enable a more even moistening of the transmission parts with transmission oil compared with known devices and methods of this kind.
  • Use of the inventive device leads to a significantly higher level of operating safety of the transmission of a wind turbine. Downtimes due to repair work and maintenance costs are thereby reduced.

Abstract

A device for spray lubrication of a wind turbine transmission is provided. The device includes a transmission enclosed by a housing, a first oil spray unit and a second oil spray unit. Both of the oil spray units are arranged in the interior of the housing. The first oil spray unit is embodied to spray oil at a first temperature in the interior of the transmission housing, while the second oil spray unit is embodied to spray oil at a second temperature in the interior of the transmission housing, wherein the first and the second temperature differ from each other.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • This application claims priority of German Patent Office application No. 10 2010 033 228.3 filed Aug. 3, 2010, which is incorporated by reference herein in its entirety.
    • FIELD OF INVENTION
  • The present invention relates to a device and a method for spray lubrication of a wind turbine transmission.
    • BACKGROUND OF INVENTION
  • In order to minimize the wear to which a transmission is subject, it is necessary that the individual transmission elements, e.g. the teeth of two intermeshed spur wheels, do not have any direct metal-to-metal contact with each other. For this reason it is important to ensure adequate lubrication, so that all metal surfaces are moistened by a film of oil or lubrication.
  • In the initial phase or after lengthy periods of wind turbine transmissions, there is however the danger that this film does not reach all metal surfaces in sufficient quantities. Because of the lack of a film of lubrication, direct metal-to-metal contact may arise, which results in increased abrasion and wear on the affected transmission parts, e.g. in the form of chatter marks. The risk of transmission failure is thereby increased.
  • In order to meet this problem, oil injection or oil spray devices are used, which squirt or spray the wind turbine transmission with oil shortly prior to its being put back into service, in order to moisten the metal surfaces with a film of oil. Nevertheless, a relatively large number of wind turbine transmissions fail shortly after restart due to inadequate moistening of metal parts with oil.
    • SUMMARY OF INVENTION
  • The object of the present invention is thus to propose a device for spray lubrication of a wind turbine transmission, which enables improved spray lubrication of the transmission parts.
  • This object is achieved by the features of the independent claims.
  • Advantageous developments of the invention are defined in the respective subclaims.
  • The present invention relates to a device for spray lubrication of a wind turbine transmission. The device comprises a transmission enclosed in a housing, a first oil spray unit and a second oil spray unit. Both oil spray units are arranged in the interior of the housing.
  • The first oil spray unit is embodied to spray oil at a first temperature in the interior of the transmission housing and the second oil spray unit is embodied to spray oil at a second temperature in the interior of the transmission housing. The first temperature and the second temperature differ from each other here.
  • The present invention additionally relates to a method for spray lubrication of a wind turbine transmission arranged in a housing, in which at least two oils, which differ from each other in their temperature, are sprayed into the housing.
  • The inventive device and the inventive method have the advantage that the oil particles of the sprayed-in oil move differently because of their different temperature, and thereby distribute themselves better within the housing. This leads to a more even moistening of the transmission parts and thus to better lubrication compared with known devices and methods of this kind.
  • According to one embodiment of the invention, the temperature difference of the sprayed-in oils is here selected in such a way that some of the oil particles rise according to the temperature in the housing and some of the oil particles sink according to the temperature in the housing. The ascending and descending of the oil particles is likewise supported by a corresponding arrangement of the spray units. Through mixing of the rising and falling oil particles an oil mist then arises after the spraying, which moves dynamically within the interior of the housing. This enables a particularly even moistening of the transmission parts with oil, in a simple and cost-effective manner.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Embodiments of the invention are described by way of example with reference to the attached drawing, in which:
  • FIG. 1 shows the inventive device for spray lubrication of a wind turbine transmission in schematic form.
    •  DETAILED DESCRIPTION OF INVENTION
  • The inventive device comprises a transmission, which is represented schematically in FIG. 1 with two spur wheels G1, G2, two transmission shafts W1, W2 and four bearings L1, L2, L3, L4. The transmission G1, G2, W1, W2, L1, L2, L3, L4 is enclosed by a transmission housing, which is not shown.
  • The inventive device further comprises two oil spray devices OS1, OS2, which together form an oil spray system. The oil spray devices OS1, OS2 are arranged spatially separated from each other on the transmission housing, specifically in such a way that at least their spray head is located within the housing. In a preferred embodiment, the oil spray devices OS1, OS2 are attached to the inside of the transmission housing.
  • As well as the two spray devices OS1, OS2 partly shown in FIG. 1 further spray devices may belong to the oil spray system.
  • The two oil spray devices OS1, OS2 create oil particles of different diameters. In one embodiment of the invention, the oil spray devices are embodied in such a way that they spray oil particles with a diameter in the range of 1 μm to 20 μm.
  • The oil to be sprayed is pre-heated, in order to attain the desired viscosity. It is then pumped through the oil spray devices OS1, OS2. It is important here that oil is sprayed out of the oil spray devices at a different temperature.
  • The oil spray devices (OS1, OS2) can be arranged at different places on the transmission housing, and spray oil on the transmission from different angles. It is however particularly advantageous if a first oil spray device (OS1) is arranged above and a second oil spray device (OS2) below the moving parts and the oil is sprayed vertically downwards or, as the case may be upwards, in the direction of the transmission parts, in order to achieve a good mixing of the oil particles.
  • This advantageous embodiment is shown in FIG. 1. The first oil spray device (OS1) is arranged above the moving parts. It sprays an oil whose temperature lies below the temperature of the oil being sprayed by the second oil spray device. This means that the upper oil spray device sprays the comparatively “cooler” oil.
  • As likewise shown in FIG. 1, the second oil spray device (OS1) is arranged below the moving parts of the transmission. It sprays an oil whose temperature lies above the temperature of the oil being sprayed by the first oil spray device (OS2). This means that the lower oil spray device sprays an oil with a comparatively “higher” temperature.
  • In FIG. 1 the rising of the oil particles with the “higher” temperature as a “heat flow” is indicated by arrows WS pointing upwards.
  • The oil particles sprayed by the first and second oil spray device (OS1, OS2) mix in the interior of the transmission housing. As a result of the different temperature and direction of motion of the oil particles an oil mist arises which changes its position within the transmission housing dynamically.
  • In FIG. 1 this “oil mist” ON is illustrated by arrows arranged in a circle.
  • The temperature difference between the first and second temperature is here selected in such a way that some of the oil particles of the sprayed oil rise and some of the oil particles of the sprayed oil sink, so that the oil mist (ON) forming as a result of the mixing of these ascending and descending oil particles changes its position in the interior of the housing.
  • In one embodiment of the invention, the temperature difference between the first and second temperature lies in the range 40° C. to 60° C.
  • In a preferred embodiment of the invention an oil at a temperature of 40° C. is sprayed by the first oil spray unit (OS1), while an oil at a temperature of 90° C. is sprayed by the second oil spray unit (OS2).
  • The described inventive device and the inventive method enable a more even moistening of the transmission parts with transmission oil compared with known devices and methods of this kind. Use of the inventive device leads to a significantly higher level of operating safety of the transmission of a wind turbine. Downtimes due to repair work and maintenance costs are thereby reduced.

Claims (13)

1.-9. (canceled)
10. A device for spray lubrication of a wind turbine transmission, the device comprising:
a transmission enclosed by a housing,
a first oil spray unit, and
a second oil spray unit,
wherein the first oil spray unit and the second oil spray unit are arranged in an interior of the housing,
wherein the first oil spray unit is configured to spray oil at a first temperature in the interior of the transmission housing,
wherein the second oil spray unit is configured to spray oil at a second temperature in the interior of the transmission housing, and
wherein the first and the second temperature differ from each other.
11. The device as claimed in claim 10, wherein the difference between the first and second temperature is selected in such a way that some of the oil particles of the sprayed oil ascend and some of the oil particles of the sprayed oil descend, and an oil mist arises as a result of the mixing of the ascending and descending oil particles, whose position in the interior of the housing changes.
12. The device as claimed in claim 10, wherein the arrangement of the oil spray units is configured in such a way that some of the oil particles of the sprayed oil ascend and some of the oil particles of the sprayed oil descend, and an oil mist arises as a result of the mixing of the ascending and descending oil particles, whose position in the interior of the housing changes.
13. The device as claimed in claim 10, wherein the temperature difference between the first and the second temperature is arranged in the range 40° C. to 60° C.
14. The device as claimed in claim 10, wherein the first oil spray unit is configured for spraying oil at a temperature of approximately 40° C.
15. The device as claimed in claim 10, wherein the second oil spray unit is configured for spraying oil at a temperature of approximately 90° C.
16. The device as claimed in claim 10, wherein the first oil spray unit is arranged above moving parts of the transmission.
17. The device as claimed in claim 10, wherein the second oil spray unit is arranged below moving parts of the transmission.
18. The device as claimed in claim 10, wherein the oil spray units are embodied in such a way that they spray oil particles with a diameter in the range of 1 μm to 20 μm.
19. A method for spray lubrication of a wind turbine transmission arranged in a housing, the method comprising:
spraying at least two oils into the housing,
wherein the at least two oils differ from each other in their temperature.
20. The method as claimed in claim 19, in which the at least two oils are sprayed with a temperature difference such that some of the oil particles of the sprayed oil ascend and some of the oil particles of the sprayed oil descend, so that an oil mist arises as a result of the mixing of the ascending and descending oil particles, whose position in the interior of the housing changes.
21. The method as claimed in claim 19, in which the spraying of the oils in the housing interior takes place in such a way that some of the oil particles of the sprayed oil rise and some of the oil particles of the sprayed oil sink, and the ascending and descending oil particles mix, so that an oil mist arises, whose position in the interior of the housing changes.
US13/191,504 2010-08-03 2011-07-27 Device for spray lubrication of a wind turbine transmission Abandoned US20120031704A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010033228A DE102010033228A1 (en) 2010-08-03 2010-08-03 Device for spray lubrication of a wind turbine gearbox
DE102010033228.3 2010-08-03

Publications (1)

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US20120031704A1 true US20120031704A1 (en) 2012-02-09

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US13/191,504 Abandoned US20120031704A1 (en) 2010-08-03 2011-07-27 Device for spray lubrication of a wind turbine transmission

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US (1) US20120031704A1 (en)
EP (1) EP2416051A1 (en)
CN (1) CN102345723A (en)
CA (1) CA2747577A1 (en)
DE (1) DE102010033228A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10001210B2 (en) 2015-02-19 2018-06-19 Toyota Jidosha Kabushiki Kaisha Lubrication structure and transmission

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012210788A1 (en) * 2012-06-26 2014-01-02 Zf Friedrichshafen Ag Device for supplying lubrication oil/cooling oil to rack engaging portion of meshing gears used in gearbox, has oil mist generator that is provided for generating oil mist with oil droplet size of less than specific value
CN104520631B (en) * 2012-08-01 2017-10-20 维斯塔斯风力系统有限公司 The method and system being lubricated to the consumption side to be monitored via consumption side's lubricant

Citations (4)

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US2857019A (en) * 1954-02-08 1958-10-21 Trabon Engineering Corp Apparatus for lubricating blooming mills
US3030529A (en) * 1960-03-28 1962-04-17 Eaton Mfg Co Oil-cooled and -lubricated electric machine cooling system
US5121815A (en) * 1990-02-20 1992-06-16 Aerospatiale Societe Nationale Industrielle Emergency lubricating device for a reduction unit particularly for a main gear box of a rotary-wing aircraft
US20090191060A1 (en) * 2008-01-29 2009-07-30 General Electric Company Lubrication heating system and wind turbine incorporating same

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DE332028C (en) * 1918-10-12 1921-07-08 Oskar Von Bohuszewicz Method for lubricating gear drives
CH86618A (en) * 1919-08-22 1920-10-01 Bbc Brown Boveri & Cie Method and device for the lubrication and cooling of gear drives.
FR2831938B1 (en) * 2001-11-07 2004-02-20 Eurocopter France LUBRICATION SYSTEM FOR TILTING POWER TRANSMISSION BOX
JP5215780B2 (en) * 2008-09-03 2013-06-19 三菱重工業株式会社 Gearbox lubrication apparatus and method
US8118536B2 (en) * 2009-10-30 2012-02-21 General Electric Company Method and system for operating a wind turbine

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857019A (en) * 1954-02-08 1958-10-21 Trabon Engineering Corp Apparatus for lubricating blooming mills
US3030529A (en) * 1960-03-28 1962-04-17 Eaton Mfg Co Oil-cooled and -lubricated electric machine cooling system
US5121815A (en) * 1990-02-20 1992-06-16 Aerospatiale Societe Nationale Industrielle Emergency lubricating device for a reduction unit particularly for a main gear box of a rotary-wing aircraft
US20090191060A1 (en) * 2008-01-29 2009-07-30 General Electric Company Lubrication heating system and wind turbine incorporating same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10001210B2 (en) 2015-02-19 2018-06-19 Toyota Jidosha Kabushiki Kaisha Lubrication structure and transmission

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EP2416051A1 (en) 2012-02-08
DE102010033228A1 (en) 2012-02-09
CN102345723A (en) 2012-02-08
CA2747577A1 (en) 2012-02-03

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AS Assignment

Owner name: SIEMENS AKTIENGESELLSCHAFT, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BRASSEUR, MICHAELA;NGUYEN, CONG;REEL/FRAME:026654/0560

Effective date: 20110708

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION