US20110176916A1 - Centrifugal fan and impeller thereof - Google Patents
Centrifugal fan and impeller thereof Download PDFInfo
- Publication number
- US20110176916A1 US20110176916A1 US12/748,447 US74844710A US2011176916A1 US 20110176916 A1 US20110176916 A1 US 20110176916A1 US 74844710 A US74844710 A US 74844710A US 2011176916 A1 US2011176916 A1 US 2011176916A1
- Authority
- US
- United States
- Prior art keywords
- blades
- blade
- blade ring
- centrifugal fan
- hub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/203—Cooling means for portable computers, e.g. for laptops
Definitions
- the present disclosure relates generally to centrifugal fans, and more particularly to an impeller of a centrifugal fan.
- cooling fans are used in combination with heat sinks for cooling electronic components, such as CPUs.
- electronic components such as CPUs.
- an impeller of the centrifugal fan rotates to generate an airflow to the electronic component, and thereby continuously take away heat of the electronic component.
- the most direct and effective way is to increase the revolving speed of the impeller, thereby increasing the flow rate of the airflow.
- increasing the revolving speed of the impeller generally causes a noise level generated by the centrifugal fan to also be increased. This may annoy or cause discomfort to a user near the centrifugal fan.
- FIG. 1 is an isometric, assembled view of a centrifugal fan, according to an exemplary embodiment.
- FIG. 2 is an exploded view of FIG. 1 .
- FIG. 3 is an enlarged view of an impeller of the centrifugal fan shown in FIG. 2 .
- the centrifugal fan includes a housing 12 and an impeller 14 rotatably received in the housing 12 .
- the housing 12 includes a top cover 120 , a bottom cover 122 , and a sidewall 124 interconnecting outer peripheries of the top cover 120 and the bottom cover 122 .
- the top cover 120 , the bottom cover 122 and the sidewall 124 cooperatively define an inner space 126 for receiving the impeller 14 therein.
- the sidewall 124 is integrally formed with the top cover 120 .
- a first air inlet 121 is defined in a central portion of the top cover 120
- a second air inlet 123 is defined in a central portion of the bottom cover 122 .
- the first air inlet 121 and the second air inlet 123 are coaxial.
- An air outlet 131 is defined in the sidewall 124 of the housing 12 , and is oriented perpendicular to the first air inlet 121 and the second air inlet 123 .
- a circular supporting base 127 is arranged in a central portion of the second air inlet 123 of the bottom cover 122 .
- a plurality of ribs 128 extend outwards from the supporting base 127 to connect an inner periphery of the bottom cover 122 , thus fixing the supporting base 127 to the bottom cover 122 .
- a tube 129 extends perpendicularly from a central portion of the supporting base 127 towards the top cover 120 .
- a bearing 130 is received in the tube 129 for supporting rotation of the impeller 14 .
- the impeller 14 includes a hub 140 , a blade ring 144 , a plurality of first blades 142 , and a plurality of second blades 146 .
- the blade ring 144 , the first blades 142 , the second blades 146 and the hub 140 are integrally formed by an injection molding process as a single monolithic piece.
- the hub 140 includes a circular wall 141 , and an annular wall 143 extending perpendicularly downward from a periphery of the circular wall 141 .
- the blade ring 144 surrounds and is spaced from the annular wall 143 of the hub 140 .
- a bottom side of the annular wall 143 is substantially coplanar with the blade ring 144 .
- the first blades 142 extend outwards from an outer circumferential surface of the annular wall 143 of the hub 140 to the blade ring 144 , and are evenly arranged along a circumferential direction of the annular wall 143 .
- Each first blade 142 includes a straight inner portion 145 and a curved outer portion 147 .
- the inner portion 145 extends from an outer circumferential surface of the annular wall 143 of the hub 140 to an inner edge of blade ring 144
- the outer portion 147 extends outwards from the inner portion 145 to an outer edge of the blade ring 144 .
- the inner portions 145 of the first blades 142 are located between the annular wall 143 and the blade ring 144 , while the outer portions 147 are entirely arranged on the blade ring 144 with bottom sides thereof integrally joined with a top side of the blade ring 144 .
- the second blades 146 are evenly arranged along a circumferential direction of the blade ring 144 , with bottom sides thereof integrally joined with the top side of the blade ring 144 .
- the second blades 146 and the outer portions 147 of the first blades 142 are arranged in an alternating fashion along a circumferential direction of the blade ring 144 .
- Each of the second blades 146 extends curvedly from the inner edge of the blade ring 144 to the outer edge of the blade ring 144 .
- Each of the outer portions 147 of the first blades 142 extends curvedly from the inner edge of the blade ring 144 to the outer edge of the blade ring 144 .
- the second blades 146 and the outer portions 147 of the first blades 142 extend curvedly such that each second blade 146 and a corresponding adjacent outer portion 147 of the first blade 142 are oriented generally symmetrically opposite each other. That is, in the present embodiment, the outer portions 147 of the first blades 142 extend outwards generally (slightly) toward a rotation direction of the impeller 14 , and the second blades 146 extend outwards generally (slightly) away from the rotation direction of the impeller 14 .
- the centrifugal fan rotates clockwise.
- the inner portions 145 of the first blades 142 are substantially or entirely straight, and extend aslant from the annular wall 143 generally (slightly) toward a counterclockwise direction; while the outer portions 147 of the first blades 142 are arc-shaped, and extend generally (slightly) toward a clockwise direction.
- the second blades 146 are arc-shaped, and extend generally (slightly) toward the counterclockwise direction.
- the impeller 14 when assembled, the impeller 14 is sandwiched between the top cover 120 and the bottom cover 122 , and surrounded by the sidewall 124 of the housing 12 .
- the blade ring 144 , the second blades 146 and the outer portions 147 of the first blades 142 all are located just under the top cover 120 of the housing 12 , while the inner portions 145 of the first blades 142 are aligned with the first air inlet 121 and second air inlet 123 .
- a flow channel (not shown) is defined between the sidewall 124 of the housing 12 and the outmost edges of the first blades 142 and second blades 146 .
- the impeller 14 is driven by a stator (not shown) of the centrifugal fan 10 to be rotatable with respect to the stator in the housing 12 .
- the first blades 142 force the air adjacent to the first air inlet 121 and second air inlet 123 into the housing 12 .
- the air then flows along the flow channel to the air outlet 131 to generate high-pressure airflow to the electronic component which needs to be cooled. Since the outer portions 147 of the first blades 142 are curved to enlarge the area of the first blades 142 , an amount of the airflow driven by the first blades 142 is improved.
- the second blades 146 arranged opposite to the first blades 142 can force the airflow to flow radially to the air outlet 131 , to thereby reduce separation of the airflow at the outer edges of the first blades 142 . Accordingly, air turbulence can be reduced, which not only reduces energy loss of the airflow, but also reduces air noise of the centrifugal fan 10 . As a result, a greater amount of airflow with reduced noise, and increased speed and pressure, is generated. Thus, the heat dissipation efficiency and inconspicuousness of the centrifugal fan 10 are improved.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- 1. Technical Field
- The present disclosure relates generally to centrifugal fans, and more particularly to an impeller of a centrifugal fan.
- 2. Description of Related Art
- Generally, cooling fans are used in combination with heat sinks for cooling electronic components, such as CPUs. Most portable electronic systems that contain electronic components, such as laptop computers and notebook computers, have limited space therein. Thus a centrifugal fan which requires only a small space for installation is generally used in such electronic systems.
- In use of the centrifugal fan, an impeller of the centrifugal fan rotates to generate an airflow to the electronic component, and thereby continuously take away heat of the electronic component. In order to improve the cooling and heat dissipation efficiency, the most direct and effective way is to increase the revolving speed of the impeller, thereby increasing the flow rate of the airflow. However, increasing the revolving speed of the impeller generally causes a noise level generated by the centrifugal fan to also be increased. This may annoy or cause discomfort to a user near the centrifugal fan.
- What is needed, therefore, is a centrifugal fan with an improved impeller to overcome the above-described limitations.
-
FIG. 1 is an isometric, assembled view of a centrifugal fan, according to an exemplary embodiment. -
FIG. 2 is an exploded view ofFIG. 1 . -
FIG. 3 is an enlarged view of an impeller of the centrifugal fan shown inFIG. 2 . - Referring to
FIG. 1 , a centrifugal fan according to an exemplary embodiment is shown. The centrifugal fan includes ahousing 12 and animpeller 14 rotatably received in thehousing 12. - Referring also to
FIG. 2 , thehousing 12 includes atop cover 120, abottom cover 122, and asidewall 124 interconnecting outer peripheries of thetop cover 120 and thebottom cover 122. Thetop cover 120, thebottom cover 122 and thesidewall 124 cooperatively define aninner space 126 for receiving theimpeller 14 therein. In this embodiment, thesidewall 124 is integrally formed with thetop cover 120. Afirst air inlet 121 is defined in a central portion of thetop cover 120, and asecond air inlet 123 is defined in a central portion of thebottom cover 122. Thefirst air inlet 121 and thesecond air inlet 123 are coaxial. Anair outlet 131 is defined in thesidewall 124 of thehousing 12, and is oriented perpendicular to thefirst air inlet 121 and thesecond air inlet 123. - A circular supporting
base 127 is arranged in a central portion of thesecond air inlet 123 of thebottom cover 122. A plurality ofribs 128 extend outwards from the supportingbase 127 to connect an inner periphery of thebottom cover 122, thus fixing the supportingbase 127 to thebottom cover 122. Atube 129 extends perpendicularly from a central portion of the supportingbase 127 towards thetop cover 120. Abearing 130 is received in thetube 129 for supporting rotation of theimpeller 14. - Referring also to
FIG. 3 , theimpeller 14 includes ahub 140, ablade ring 144, a plurality offirst blades 142, and a plurality ofsecond blades 146. In this embodiment, theblade ring 144, thefirst blades 142, thesecond blades 146 and thehub 140 are integrally formed by an injection molding process as a single monolithic piece. Thehub 140 includes acircular wall 141, and anannular wall 143 extending perpendicularly downward from a periphery of thecircular wall 141. Theblade ring 144 surrounds and is spaced from theannular wall 143 of thehub 140. A bottom side of theannular wall 143 is substantially coplanar with theblade ring 144. - The
first blades 142 extend outwards from an outer circumferential surface of theannular wall 143 of thehub 140 to theblade ring 144, and are evenly arranged along a circumferential direction of theannular wall 143. Eachfirst blade 142 includes a straightinner portion 145 and a curvedouter portion 147. Theinner portion 145 extends from an outer circumferential surface of theannular wall 143 of thehub 140 to an inner edge ofblade ring 144, while theouter portion 147 extends outwards from theinner portion 145 to an outer edge of theblade ring 144. That is, theinner portions 145 of thefirst blades 142 are located between theannular wall 143 and theblade ring 144, while theouter portions 147 are entirely arranged on theblade ring 144 with bottom sides thereof integrally joined with a top side of theblade ring 144. - The
second blades 146 are evenly arranged along a circumferential direction of theblade ring 144, with bottom sides thereof integrally joined with the top side of theblade ring 144. Thesecond blades 146 and theouter portions 147 of thefirst blades 142 are arranged in an alternating fashion along a circumferential direction of theblade ring 144. Each of thesecond blades 146 extends curvedly from the inner edge of theblade ring 144 to the outer edge of theblade ring 144. Each of theouter portions 147 of thefirst blades 142 extends curvedly from the inner edge of theblade ring 144 to the outer edge of theblade ring 144. Preferably, thesecond blades 146 and theouter portions 147 of thefirst blades 142 extend curvedly such that eachsecond blade 146 and a corresponding adjacentouter portion 147 of thefirst blade 142 are oriented generally symmetrically opposite each other. That is, in the present embodiment, theouter portions 147 of thefirst blades 142 extend outwards generally (slightly) toward a rotation direction of theimpeller 14, and thesecond blades 146 extend outwards generally (slightly) away from the rotation direction of theimpeller 14. - In this exemplary embodiment, the centrifugal fan rotates clockwise. In this example, the
inner portions 145 of thefirst blades 142 are substantially or entirely straight, and extend aslant from theannular wall 143 generally (slightly) toward a counterclockwise direction; while theouter portions 147 of thefirst blades 142 are arc-shaped, and extend generally (slightly) toward a clockwise direction. Thus an area of eachfirst blade 142 is enlarged, and more air can be driven by thefirst blades 142. Thesecond blades 146 are arc-shaped, and extend generally (slightly) toward the counterclockwise direction. Considered another way, eachsecond blade 146 and theouter portion 147 of one neighboringfirst blade 142 form a profile like a pair of parentheses. - Referring to
FIG. 1 again, when assembled, theimpeller 14 is sandwiched between thetop cover 120 and thebottom cover 122, and surrounded by thesidewall 124 of thehousing 12. Theblade ring 144, thesecond blades 146 and theouter portions 147 of thefirst blades 142 all are located just under thetop cover 120 of thehousing 12, while theinner portions 145 of thefirst blades 142 are aligned with thefirst air inlet 121 andsecond air inlet 123. A flow channel (not shown) is defined between thesidewall 124 of thehousing 12 and the outmost edges of thefirst blades 142 andsecond blades 146. - During operation, the
impeller 14 is driven by a stator (not shown) of thecentrifugal fan 10 to be rotatable with respect to the stator in thehousing 12. As theimpeller 14 rotates, thefirst blades 142 force the air adjacent to thefirst air inlet 121 andsecond air inlet 123 into thehousing 12. The air then flows along the flow channel to theair outlet 131 to generate high-pressure airflow to the electronic component which needs to be cooled. Since theouter portions 147 of thefirst blades 142 are curved to enlarge the area of thefirst blades 142, an amount of the airflow driven by thefirst blades 142 is improved. Further, thesecond blades 146 arranged opposite to thefirst blades 142 can force the airflow to flow radially to theair outlet 131, to thereby reduce separation of the airflow at the outer edges of thefirst blades 142. Accordingly, air turbulence can be reduced, which not only reduces energy loss of the airflow, but also reduces air noise of thecentrifugal fan 10. As a result, a greater amount of airflow with reduced noise, and increased speed and pressure, is generated. Thus, the heat dissipation efficiency and inconspicuousness of thecentrifugal fan 10 are improved. - It is to be understood, however, that even though numerous characteristics and advantages of certain embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (14)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010103003751A CN102128178A (en) | 2010-01-16 | 2010-01-16 | Fan blade structure and centrifugal fan with same |
CN201010300375.1 | 2010-01-16 |
Publications (1)
Publication Number | Publication Date |
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US20110176916A1 true US20110176916A1 (en) | 2011-07-21 |
Family
ID=44266397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/748,447 Abandoned US20110176916A1 (en) | 2010-01-16 | 2010-03-28 | Centrifugal fan and impeller thereof |
Country Status (2)
Country | Link |
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US (1) | US20110176916A1 (en) |
CN (1) | CN102128178A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130120935A1 (en) * | 2011-11-11 | 2013-05-16 | Asustek Computer Inc. | Heat dissipating module |
WO2019093576A1 (en) * | 2017-11-07 | 2019-05-16 | 주식회사 에어로네트 | Impeller having primary blades and secondary blades |
US11454249B2 (en) * | 2020-01-14 | 2022-09-27 | Acer Incorporated | Heat dissipation fan |
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TWI464325B (en) * | 2011-10-05 | 2014-12-11 | Giga Byte Tech Co Ltd | Fan |
EP2771763A4 (en) * | 2011-10-28 | 2015-06-10 | Hewlett Packard Development Co | Fan impeller with multiple blades shaped and disposed to provide high air-power efficiency |
CN103388591B (en) * | 2012-05-07 | 2016-02-03 | 协禧电机股份有限公司 | Radiation fan |
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CN104154044B (en) * | 2014-06-23 | 2017-05-31 | 珠海格力电器股份有限公司 | Centrifugation blade |
CN106385136A (en) * | 2016-10-08 | 2017-02-08 | 上海川也电机有限公司 | Suction fan cooled open motor |
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CN107965744B (en) * | 2017-12-26 | 2024-05-17 | 山东星宇方泰光电科技有限公司 | Cyclone radiator and radiating method |
CN108488099B (en) * | 2018-03-28 | 2020-12-18 | 联想(北京)有限公司 | Fan and electronic equipment |
CN108869389B (en) * | 2018-07-27 | 2023-11-28 | 深圳兴奇宏科技有限公司 | Fan blade structure and centrifugal fan |
WO2020077916A1 (en) * | 2018-10-15 | 2020-04-23 | 广东美的白色家电技术创新中心有限公司 | Counter-rotating fan |
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US1471141A (en) * | 1922-09-09 | 1923-10-16 | Robert Alfred Blake | Centrifugal fan |
US2083996A (en) * | 1935-02-02 | 1937-06-15 | Breuer Electric Mfg Co | Centrifugal fan |
JPS5238612A (en) * | 1975-09-22 | 1977-03-25 | Kubota Ltd | Radial flow fan |
WO1990002265A1 (en) * | 1988-08-16 | 1990-03-08 | Dresser-Rand Company | Partial height blades in a compressor impeller |
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CN2355151Y (en) * | 1997-10-22 | 1999-12-22 | 西安交通大学 | Multi-wing small flow rate high pressure impeller of centrifugal fan |
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2010
- 2010-01-16 CN CN2010103003751A patent/CN102128178A/en active Pending
- 2010-03-28 US US12/748,447 patent/US20110176916A1/en not_active Abandoned
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US1471141A (en) * | 1922-09-09 | 1923-10-16 | Robert Alfred Blake | Centrifugal fan |
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JPS5238612A (en) * | 1975-09-22 | 1977-03-25 | Kubota Ltd | Radial flow fan |
WO1990002265A1 (en) * | 1988-08-16 | 1990-03-08 | Dresser-Rand Company | Partial height blades in a compressor impeller |
US6589013B2 (en) * | 2001-02-23 | 2003-07-08 | Macro-Micro Devices, Inc. | Fluid flow controller |
US7255532B2 (en) * | 2004-10-08 | 2007-08-14 | Wen-Chun Zheng | Bi-directional blowers for cooling computers |
US7435051B2 (en) * | 2005-01-10 | 2008-10-14 | Degree Controls, Inc. | Multi-stage blower |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130120935A1 (en) * | 2011-11-11 | 2013-05-16 | Asustek Computer Inc. | Heat dissipating module |
US9036348B2 (en) * | 2011-11-11 | 2015-05-19 | Asustek Computer Inc. | Heat dissipating module |
WO2019093576A1 (en) * | 2017-11-07 | 2019-05-16 | 주식회사 에어로네트 | Impeller having primary blades and secondary blades |
US20200370562A1 (en) * | 2017-11-07 | 2020-11-26 | Aeronet Inc. | Impeller having primary blades and secondary blades |
US11454249B2 (en) * | 2020-01-14 | 2022-09-27 | Acer Incorporated | Heat dissipation fan |
Also Published As
Publication number | Publication date |
---|---|
CN102128178A (en) | 2011-07-20 |
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Legal Events
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AS | Assignment |
Owner name: FU ZHUN PRECISION INDUSTRY (SHEN ZHEN) CO., LTD., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIANG, EN-MING;YU, FANG-XIANG;HONG, CHIEN-LONG;REEL/FRAME:024149/0119 Effective date: 20100224 Owner name: FOXCONN TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:LIANG, EN-MING;YU, FANG-XIANG;HONG, CHIEN-LONG;REEL/FRAME:024149/0119 Effective date: 20100224 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |