US20120120524A1 - Temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive - Google Patents
Temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive Download PDFInfo
- Publication number
- US20120120524A1 US20120120524A1 US13/272,974 US201113272974A US2012120524A1 US 20120120524 A1 US20120120524 A1 US 20120120524A1 US 201113272974 A US201113272974 A US 201113272974A US 2012120524 A1 US2012120524 A1 US 2012120524A1
- Authority
- US
- United States
- Prior art keywords
- hard disk
- disk drive
- thermal
- thermal chamber
- heat
- 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
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/14—Reducing influence of physical parameters, e.g. temperature change, moisture, dust
- G11B33/1406—Reducing the influence of the temperature
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/208—Liquid cooling with phase change
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- General Engineering & Computer Science (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Reciprocating Pumps (AREA)
- Control Of Temperature (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
A temperature control apparatus for a hard disk drive includes: a thermal chamber for receiving a hard disk drive; and an oscillatory air movement generator for generating air movement within a region between the thermal chamber and the hard disk drive when received in the thermal chamber, thereby to facilitate heat transfer between the thermal chamber and the hard disk drive.
Description
- The present invention relates to a temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive.
- During manufacture of hard disk drives it is necessary to test the hard disk drives to ensure that they to meet required specifications. As part of the testing, it is necessary to control the temperature of the hard disk drives. The temperature of the hard disk drives is varied across a wide range during testing.
- It is also desirable to maintain the temperature of a hard disk drive to be within a predetermined range during normal operation of the hard disk drive, i.e. when the hard disk drive is in normal use by an end user.
- It is known to test hard disk drives in apparatus including a test rack comprising a framework matrix for receiving housings each containing a hard disk drive for testing. To provide control of the temperature to which a hard disk drive is exposed during testing, a cooling system including one or more heat exchangers is typically provided associated with the test rack. These heat exchangers generate cool air that is then provided to cool both control electronics associated with each housing and to cool the hard disk drive(s) being tested. A heat source may also be provided to heat the hard disk drives during testing.
- Conventionally, radial or centrifugal fans are used to generate airflow to move the cooled air via various ducted pathways over the control electronics and the hard disk drive(s) within the housings. Typically, separate fans are used to generate airflow for cooling the control electronics and the hard disk drive(s) being tested. A problem with the use of fans to generate the airflow is that they introduce vibration to the apparatus that can severely affect hard disk drive testing.
- According to a first aspect of the present invention, there is provided a temperature control apparatus for a hard disk drive, the apparatus comprising:
- a thermal chamber for receiving a hard disk drive; and
- an oscillatory air movement generator for generating air movement within a region between the thermal chamber and a said hard disk drive when received in the thermal chamber, thereby to facilitate heat transfer between the thermal chamber and a said hard disk drive.
- In contrast to conventional systems in which radial or centrifugal fans are used in combination with a heat exchanger to generate airflow for controlling the temperature of a hard disk drive, in embodiments of the present invention an oscillatory air movement generator is provided for generating air movement within the region between a thermal chamber and a hard disk drive in normal use or during testing. This reduces the unwanted vibration to which a hard disk drive would otherwise be exposed. Furthermore, the nature of the air movement within a region between the thermal chamber and a hard disk drive when received in the thermal chamber enables the volume that is maintained at a desired temperature around a hard disk drive in use or during tested to be localised around the hard disk drive.
- The temperature control apparatus may be provided as part of a hard disk drive test apparatus. Alternatively, the temperature control apparatus may be provided for control of the temperature of a hard disk drive during normal use.
- In one example, the oscillatory air movement generator is a voice-coil motor connected to a diaphragm. Alternatively, the oscillatory air movement generator may be a piezo-electric element or bellows.
- Preferably, the apparatus comprises plural thermal chambers each for receiving a respective hard disk drive; and,
- an oscillatory air movement generator for generating air movement within a region between each of the thermal chambers and a said hard disk drive when received in each of the thermal chambers thereby to facilitate heat transfer between a said hard disk drive received in use within each of the thermal chambers and the respective thermal chamber.
- Preferably baffles are provided between individual ones of the thermal chambers. These provide thermal isolation to individual ones of the thermal chambers and enable only a single air-moving actuator to be used to generate the air movement for plural thermal chambers.
- According to a second aspect of the present invention, there is provided a method of varying the temperature of a hard disk drive in a thermal chamber, the method comprising:
- generating non-mass flow air movement in the region between the hard disk drive and the thermal chamber to facilitate efficient heat transfer therebetween.
- According to a third aspect of the present invention, there is provided a temperature control apparatus for a hard disk drive, the apparatus comprising:
- a thermal chamber for receiving a hard disk drive, wherein when a said hard disk drive is received within the thermal chamber heat transfer between the thermal chamber and the said hard disk drive is enabled by air movement within a region between the thermal chamber and the said hard disk drive.
- In embodiments, the invention provides a hard disk drive test apparatus in which non-mass flow air movement is used to disturb the air within the region between a hard disk drive arranged in a thermal chamber and the thermal chamber itself. This improves the transfer of heat between the thermal chamber and a hard disk drive arranged in the apparatus in use, e.g. during testing, whilst avoiding the problems of vibration encountered with the use of radial or centrifugal fans.
- In an alternative aspect of the present invention, there is provided a temperature control apparatus for a hard disk drive, the apparatus comprising:
- a thermal chamber for receiving a hard disk drive; and
- an air movement generator for generating air movement within a region between the thermal chamber and a said hard disk drive when received in the thermal chamber, thereby to facilitate heat transfer between the thermal chamber and a said hard disk drive.
- Examples of the present invention will now be described in detail, with reference to the accompanying drawings, in which:
-
FIG. 1 shows an example of a temperature control apparatus according to an embodiment of the present invention; -
FIG. 2 shows a sectional side view of the temperature control apparatus ofFIG. 1 ; and, -
FIG. 3 shows a plan view of an example of a temperature control apparatus according to an embodiment of the present invention. -
FIG. 1 shows an example of a temperature control apparatus according to an embodiment of the present invention. Theapparatus 2 comprises athermal chamber 6 for receiving ahard disk drive 12. Thethermal chamber 6 can function both as a heat sink and as a heat source. In use the temperature control apparatus would typically be provided within a framework matrix as will be described below with reference toFIG. 3 . Thethermal chamber 6 may typically be an appropriately shaped block of metal having fins and ducts as required to facilitate efficient heat transfer via air between a hard disk drive being tested and the thermal chamber. - In the particular embodiment shown, a
heat pump 8 is provided in thermal communication with thethermal chamber 6. Aheat exchanger 10 is also provided in thermal communication with theheat pump 8. By varying the operation of theheat pump 8, the temperature of thethermal chamber 6 and therefore the environmental temperature to which thehard disk drive 12 is exposed, may be varied. Theheat pump 8 is connected to theheat exchanger 10 viaplates 11 and aheat pipe 17 that in combination enable bidirectional heat transfer i.e. heat transfer in both directions between theheat pump 8 and theheat exchanger 10. - The heat pipe is preferably flexible. This enables the plate B to be moved away from the system heat exchanger. Preferably, a selectively reconfigurable connector (not shown) is provided to enable connection and disconnection of the plate B and the
heat exchanger 10. - A heat pipe is a preferred type of device for enabling transfer of heat between the
pump 8 and theheat exchanger 10. This is because the heat pipe is efficient, has a low volume and no moving parts. Any device that can transfer heat from thepump 8 to theheat exchanger 10 can be used, e.g., ducts for a flowing heat transfer fluid could be used. - With respect to the thermal chamber the
heat pump 8 functions as a heat source or as a heat receiver. Any device that can provide this functionality may be used. Indeed, any type of heat pump that is capable of pumping heat into and/or out of an object may be used. A particularly preferred example is a peltier device. A peltier heat pump typically can enable cooling to temperatures less than 0° C. In the example shown inFIG. 1 , theheat pump 8,plates 11 andheat pipe 17 enable heat to flow both to and from theheat exchanger 10 in dependence on the desired temperature of thehard disk drive 12. - The
thermal chamber 6 is provided with apertures 15 to enable mounting of the thermal chamber in a suitable carrier. When used for testing a hard disk drive the thermal chamber may be mounted in a structure such as a framework matrix for receiving plural thermal chambers. - The thermal chamber may have dimensions such that a hard disk drive received within it is in close proximity to the inner walls of the thermal chamber. Heat transfer may then be effected between the hard disk drive and the thermal chamber by convective currents. In this example there would be no requirement for an oscillatory air flow generator. In both cases heat transfer is effected in the region between the thermal chamber and a hard disk drive by non-mass flow movement of air within the thermal chamber, but substantially not through the chamber. In other words, the air within the thermal chamber is agitated or disturbed thereby generating non-mass flow air movement.
- In the case where a small volume of air is provided within the region between a hard disk drive and the thermal chamber a purge of air is easily accomplished. This may be desirable since it enables any water content contained in the air originally in the chamber to be removed so that if the hard disk drive is then cooled to below the dew point of air no condensation will be formed. Furthermore, the low volume of air within the region between a hard disk drive and the thermal chamber also means that even if no purge of air is performed, the amount of condensation formed will be minimal.
- Referring now to
FIG. 2 , a section along the line II′ throughFIG. 1 is shown. For clarity inFIG. 2 , theheat pump 8 is omitted. As can be seen inFIG. 2 , in this example an air-movingactuator 14 is provided. The air-movingactuator 14 is an example of an oscillatory or non-mass flow air movement generator and serves to generate oscillatory or non-mass flow air movement within the region between thehard disk drive 12 and thethermal chamber 6. This air movement improves the efficiency of heat transfer between thethermal chamber 6 and thehard disk drive 12. - The movement of the air-moving
actuator 14 that generates the air movement is substantially translational. It will be understood that air within the region between the thermal chamber and the hard disk drive is effectively disturbed in a non-mass flow manner such that heat transfer is enabled between the thermal chamber and the hard disk drive by the volume of air filling the region. In other words there is substantially no aggregate mass flow of air into or out of the region between the inner walls of the thermal chamber and the hard disk drive. However, the air within this region is agitated such that heat transfer is enabled between the thermal chamber and the hard disk drive. - The
air moving actuator 14 may be remote from the thermal chamber. Alternatively the actuator could be arranged adjacent to the thermal chamber or even embedded within the body of the thermal chamber. In one embodiment the air movement actuator comprises two components arranged in use on opposite sides of the thermal chamber. The components are arranged to operate in an alternate fashion such that on aggregate non-mass flow air movement is generated within the region between the thermal chamber and a hard disk drive arranged within it. - The vibration to which the
hard disk drive 12 is subjected during operation of theactuator 14 is significantly reduced in comparison to that that it would experience if a conventional rotary fan were used to generate air movement. This is due in part to the reduced coupling between the actuator 14 and the hard disk drive compared to that between a conventional rotary fan and a hard disk drive in a similar arrangement. - In addition, where low frequency oscillatory air movement is used, the effect on the hard disk drive is minimal since the servo loops in hard disk drives are typically less sensitive to low frequency vibrations. Typically, the frequency of oscillation is less than or equal to about 30 Hz. The frequency and wave shape of the air movement may be optimised for the application and particular hard disk drive being used or tested. At present, for hard disk drives the frequency might be less than or equal to about 30 Hz. In the future, hard disk drives may require different optimisations.
- Furthermore, the fact that the air movement is oscillatory or non-mass flow has the effect that the air remains substantially local to the hard disk drive being tested. As will be explained below with reference to
FIG. 3 , this provides the advantage that a single air-moving actuator may be used for plural hard disk drives. - In the example shown in
FIG. 2 , the air-moving actuator comprises a voice-coil motor 16 connected to adiaphragm 18. This is commonly referred to as a loudspeaker. It will be appreciated that other means may be utilised that are also capable of generating non-mass flow air movement in the region between thehard disk drive 12 and thethermal chamber 6, thereby increasing the efficiency of heat transfer between the heat exchanger and the hard-disk drive 12. For example, a piezo-electric element may be used instead of the voice-coil motor. - In some examples, there may be actual physical contact between a hard disk drive and the thermal chamber receiving it such that heat transfer between the two may also be effected, in part, by conduction.
-
FIG. 3 shows an example of hard disk drive test apparatus including temperature control apparatus according to an embodiment of the present invention. The figure shows a schematic plan view of a horizontal section through the hard disk drive test apparatus. The test apparatus includes temperature control apparatus as shown in and described above with reference toFIGS. 1 and 2 that may be used to vary the temperatures to which plural hard disk drives are exposed. - The
test apparatus 20 comprises a framework matrix containing a plurality of temperature control apparatuses. Each temperature control apparatus is mounted directly within the framework matrix. Apertures 15 within thethermal chamber 6 enable the hard disk drive within the thermal chamber optionally to be mounted to something other than the thermal chamber itself for optimisation of vibrational performance. As in the example shown inFIG. 2 , anair moving actuator 14 is provided for generating non-mass flow air movement although the test apparatus may be provided without anair moving actuator 14. Anair channel 24 provides a route for transferring movement of the air from the actuator to within theapparatus 20. In the specific example shown, the route is provided by ducting. - In the example shown, a single air-moving actuator is provided for generating the air movement for plural hard disk drives. A number of separating baffles 22 are provided for limiting the thermal interaction between hard disk drives 12 in the test apparatus. This enables a
single actuator 14 to be utilised to provide air movement for regulating the temperature of plural disk drives 12. In addition limiting thermal interaction between hard disk drives enables one actuator to be used for multiple hard disk drives, possibly each at a different temperature. Of course, a dedicated air-movingactuator 14 may be provided for each of the hard disk drives. - Embodiments of the present invention have been described with particular reference to the examples illustrated. However, it will be appreciated that variations and modifications may be made to the examples described within the scope of the present invention.
Claims (20)
1. A temperature control apparatus for a hard disk drive, the apparatus comprising:
a thermal chamber for receiving a hard disk drive; and
an oscillatory air movement generator for generating air movement within a region between the thermal chamber and a said hard disk drive when received in the thermal chamber, thereby to facilitate heat transfer between the thermal chamber and a said hard disk drive
wherein the heat transfer between the thermal chamber and the said hard disk drive is at least in part effected by conduction.
2. An apparatus according to claim 1 , wherein the oscillatory air movement generator comprises a diaphragm driven in an oscillatory manner by a driver.
3. An apparatus according to claim 2 , wherein there is actual physical contact between the thermal chamber and the said hard disk drive to enable the conductive heat transfer.
4. An apparatus according to claim 1 , wherein the oscillatory air movement generator is a piezo-electric element.
5. An apparatus according to claim 1 , comprising a heat pump in thermal communication with the thermal chamber for pumping heat to and from the thermal chamber.
6. An apparatus according to claim 5 , wherein the heat pump is a peltier heat pump.
7. An apparatus according to claim 5 , comprising a heat exchanger coupled to the heat pump selectively to provide heat to or receive heat from the heat pump.
8. An apparatus according to claim 7 , comprising a heat pipe to transfer heat from the pump to the heat exchanger and vice versa.
9. An apparatus according to claim 1 , comprising a hard disk drive arranged within the thermal chamber.
10. An apparatus according to claim 2 , comprising:
plural thermal chambers each for receiving a respective hard disk drive; and,
an oscillatory air movement generator for generating air movement in a region between each of the thermal chambers and a said hard disk drive when received in each of the thermal chambers thereby to facilitate heat transfer between a said hard disk drive arranged in use within each of the thermal chambers and the respective thermal chamber
wherein the heat transfer between the thermal chamber and the said hard disk drive is at least in part effected by conduction.
11. An apparatus according to claim 10 , comprising baffles arranged between respective thermal chambers thereby limiting thermal interaction between thermal chambers.
12. An apparatus according to claim 10 , comprising a respective heat pump for each of the plural thermal chambers.
13. An apparatus according to claim 10 , comprising a unitary oscillatory air movement generator for generating the air movement for one or more of the thermal chambers.
14. An apparatus according to claim 10 , comprising a framework for receiving each of the plural thermal chambers and maintaining said plural thermal chambers in a substantially fixed spatial relationship to each other.
15. A hard disk drive test apparatus comprising a temperature control apparatus according to claim 1 .
16. (canceled)
17. A method of testing one or more hard disk drives when arranged in a hard disk drive test apparatus according to claim 15 , the method comprising:
generating non-mass flow air movement between the or each hard disk drive and the or each corresponding thermal chamber to facilitate efficient heat transfer between the or each hard disk drive and the or each corresponding thermal chamber.
18. A method according to claim 17 , wherein there are plural thermal chambers, the method comprising:
independently controlling the temperatures of the thermal chambers so that different ones of the plural hard disk drives may be controlled to be at corresponding different temperatures.
19. (canceled)
20. Apparatus according to claim 10 , wherein there is actual physical contact between the thermal chamber and the said hard disk drive to enable the conductive heat transfer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US13/272,974 US20120120524A1 (en) | 2004-11-03 | 2011-10-13 | Temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US62417304P | 2004-11-03 | 2004-11-03 | |
PCT/GB2005/004150 WO2006048611A1 (en) | 2004-11-03 | 2005-10-27 | A temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive |
US66580607A | 2007-04-19 | 2007-04-19 | |
US13/272,974 US20120120524A1 (en) | 2004-11-03 | 2011-10-13 | Temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2005/004150 Continuation WO2006048611A1 (en) | 2004-11-03 | 2005-10-27 | A temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive |
US66580607A Continuation | 2004-11-03 | 2007-04-19 |
Publications (1)
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US20120120524A1 true US20120120524A1 (en) | 2012-05-17 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/665,806 Expired - Fee Related US8061155B2 (en) | 2004-11-03 | 2005-10-27 | Temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive |
US13/272,974 Abandoned US20120120524A1 (en) | 2004-11-03 | 2011-10-13 | Temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/665,806 Expired - Fee Related US8061155B2 (en) | 2004-11-03 | 2005-10-27 | Temperature control apparatus for a hard disk drive and a method of varying the temperature of a hard disk drive |
Country Status (7)
Country | Link |
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US (2) | US8061155B2 (en) |
JP (1) | JP4797023B2 (en) |
KR (1) | KR20070083933A (en) |
CN (1) | CN101065805B (en) |
GB (1) | GB2434910B (en) |
HK (1) | HK1103469A1 (en) |
WO (1) | WO2006048611A1 (en) |
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2005
- 2005-10-27 WO PCT/GB2005/004150 patent/WO2006048611A1/en active Application Filing
- 2005-10-27 KR KR1020077010055A patent/KR20070083933A/en not_active Application Discontinuation
- 2005-10-27 JP JP2007538508A patent/JP4797023B2/en not_active Expired - Fee Related
- 2005-10-27 CN CN2005800362891A patent/CN101065805B/en not_active Expired - Fee Related
- 2005-10-27 US US11/665,806 patent/US8061155B2/en not_active Expired - Fee Related
- 2005-10-27 GB GB0703732A patent/GB2434910B/en not_active Expired - Fee Related
-
2007
- 2007-10-18 HK HK07111328A patent/HK1103469A1/en not_active IP Right Cessation
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2011
- 2011-10-13 US US13/272,974 patent/US20120120524A1/en not_active Abandoned
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US6550263B2 (en) * | 2001-02-22 | 2003-04-22 | Hp Development Company L.L.P. | Spray cooling system for a device |
Cited By (1)
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US10145890B2 (en) | 2014-03-28 | 2018-12-04 | Hewlett Packard Enterprise Development Lp | Testing electronic devices |
Also Published As
Publication number | Publication date |
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CN101065805B (en) | 2010-04-14 |
US8061155B2 (en) | 2011-11-22 |
KR20070083933A (en) | 2007-08-24 |
JP2008519380A (en) | 2008-06-05 |
GB2434910B (en) | 2008-07-30 |
CN101065805A (en) | 2007-10-31 |
JP4797023B2 (en) | 2011-10-19 |
US20080112075A1 (en) | 2008-05-15 |
HK1103469A1 (en) | 2007-12-21 |
GB2434910A (en) | 2007-08-08 |
WO2006048611A1 (en) | 2006-05-11 |
GB0703732D0 (en) | 2007-04-04 |
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Legal Events
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AS | Assignment |
Owner name: XYRATEX TECHNOLOGY LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FARQUHAR, DAVID RONALD BAIN;ORRISS, DAVID JOHN;SIGNING DATES FROM 20111025 TO 20111028;REEL/FRAME:027607/0706 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |