US20050034468A1 - Time-extended cooling system for line-powered apparatus - Google Patents
Time-extended cooling system for line-powered apparatus Download PDFInfo
- Publication number
- US20050034468A1 US20050034468A1 US10/638,585 US63858503A US2005034468A1 US 20050034468 A1 US20050034468 A1 US 20050034468A1 US 63858503 A US63858503 A US 63858503A US 2005034468 A1 US2005034468 A1 US 2005034468A1
- Authority
- US
- United States
- Prior art keywords
- cooling
- power supply
- sensing
- primary power
- secondary power
- 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
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/56—Cooling arrangements using liquid coolants
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3144—Cooling systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
- F25B21/02—Machines, plants or systems, using electric or magnetic effects using Peltier effect; using Nernst-Ettinghausen effect
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/16—Sensors measuring the temperature of products
Definitions
- the present invention relates generally to cooling systems, and more particularly to line-powered electrical devices that generate heat.
- the heat generating components can get extremely hot.
- the temperature inside the component is often sufficient to destroy neighboring parts, unless the components are cooled.
- the temperature inside a video projector bulb can exceed several thousand degrees. Damage is prevented by keeping the thermal resistance from those surrounding areas to the ambient air as low as possible compared to the thermal resistance from the heat source to the surrounding areas. In effect, the very high temperatures are contained in a small area through this thermal resistance mismatch.
- a fan or other cooling device is employed to keep the outer thermal resistance as low as possible.
- U.S. Pat. No. 5,828,967 describes a method of using a by-pass line to continue to run the cooling fan for some time after the engine is turned off.
- the fan power comes typically from a battery. Because the battery is needed to start the engine, the amount of energy that is used for running the fan after shutdown is minimized.
- U.S. Pat. No. 6,472,828 describes a method for controlling fan speed in a projector in order to allow faster bulb turn-on. By running the fan at low speeds initially, the thermal resistance is momentarily higher, allowing the temperature to rise rapidly. The fan speed is then increased to prevent overheating during normal operation. However, the system does not address cool down in the event of line power loss.
- U.S. Pat. No. 5,938,407 addresses an entirely different problem. There, it is desired to keep a coal stove fire as hot as possible in the event of a primary power loss. That system includes two motors that run a fan. The backup motor mechanically engages with the fan, and an alternate power source controlled by a backup circuit. When power is lost, a solenoid is de-energized, depressing a switch and completing the backup circuit to the alternate power source. The backup motor rotates into contact with the fan to ensure uninterrupted airflow. That backup system is for powering an air distribution fan that ensures sufficient oxygen reaches a coal fire burning within a coal stove to maintain the coal fire hot until primary power is restored.
- the electrical equipment containing the invention is provided with an energy storage device.
- This energy storage device receives and stores energy during normal line-powered operation. When line power is lost, the energy storage device provides power to operate an active cooling system for a period of time sufficient to prevent thermal damage.
- the energy storage device can take one or more forms, including, but not limited to the following: a battery, a capacitor, a spring, a flywheel, a compressed gas, and the like.
- the cooling system can take one or more of a plurality of forms, including, but not limited to the following: a fan, a liquid cooling system, a Peltier device, a refrigeration system, and the like.
- FIG. 1 is a block diagram of a system using a time-extended cooling apparatus according to the invention.
- FIG. 1 shows a projector system 100 that uses the invention. It should be understood that the invention can also be used by other heat generating electrical systems and devices.
- the projector includes a heat source 110 , i.e., a lamp.
- the temperature of the lamp can reach several thousand degrees. If the lamp gets too hot, then it can self-destruct, as well as damage nearby components. Therefore, during normal operation, a fan 120 is used to cool the lamp.
- the fan is connected to a primary power supply 130 , normally a power line.
- the projector 100 also includes a secondary power supply 140 , for example, a rechargeable battery. Should there be a failure in the primary power supply, then a switch 150 can cause the fan 120 to be operated from the secondary power supply until a sensor 160 determines that the lamp has cooled sufficiently. The sensor can also control the speed of the fan to maximize battery lifetime.
- a secondary power supply 140 for example, a rechargeable battery.
- the rechargeable battery is contained in an accessible compartment 170 .
- the switch or another simple sensor determines the presence or absence of the battery. If the battery is not installed, or the battery is low in charge, an audible or visual warning can be given. Alternatively, a network can be used to send an alert message to a system operator.
- An alternative embodiment of the invention embeds the secondary power supply, sensor and switch in the fan.
- a fan thus configured can be installed in any place where time-extended cooling is required.
- the fan is modified to wind a clock spring to a certain tension and maintain it at a given level. When primary power is removed, the spring provides the power to spin the fan for some additional time.
Abstract
Description
- The present invention relates generally to cooling systems, and more particularly to line-powered electrical devices that generate heat.
- Many electrical devices and systems require active cooling systems to prevent over-heating. In passive cooling systems, the heat generated from internal components is conducted away to a cooler area via a path of sufficiently low thermal resistance. If the thermal resistance is too high or if the temperature difference is too small to support sufficient heat flow, active cooling systems must be employed. Forced air-cooling is often used for this purpose. It effectively lowers the thermal resistance, and thus lowers the temperature rise with respect to ambient conditions for a given amount of thermal energy.
- In some systems, the heat generating components can get extremely hot. The temperature inside the component is often sufficient to destroy neighboring parts, unless the components are cooled. For example, the temperature inside a video projector bulb can exceed several thousand degrees. Damage is prevented by keeping the thermal resistance from those surrounding areas to the ambient air as low as possible compared to the thermal resistance from the heat source to the surrounding areas. In effect, the very high temperatures are contained in a small area through this thermal resistance mismatch. Often, a fan or other cooling device is employed to keep the outer thermal resistance as low as possible.
- It is useful to consider what happens when line-power is suddenly lost in actively cooled equipment with a high temperature component. Although no further heat is generated in the component, the thermal mass of the component has stored some amount of heat energy, which must be dissipated. Thus, heat continues to flow out of the component. If an active cooling system ceases to function, the outer thermal resistance increases, slowing the flow of heat to the ambient environment, and in effect, creating an outer, somewhat more thermally insulated layer. This can cause a dramatic temperature rise in the parts surrounding the hot component, which can be destructive.
- To combat this problem, many electronic systems with hot components have a special power-down cycle, which immediately removes power from the heat-generating component, but continues to run the cooling system for sufficient time to cool down the hot component. A severe problem arises if all power is lost unexpectedly, and a normal cool down cycle is not possible. For video projectors, sudden loss of power and the resulting inability to properly cool the lamp results in a premature device failure. There is a clear need for a method of cooling devices and systems in a controlled manner, even in the event of the loss of line power.
- A similar thermal problem occurs in an internal combustion engine, where heat must be dissipated after the engine has been turned off. U.S. Pat. No. 5,828,967 describes a method of using a by-pass line to continue to run the cooling fan for some time after the engine is turned off. In this case, the fan power comes typically from a battery. Because the battery is needed to start the engine, the amount of energy that is used for running the fan after shutdown is minimized.
- U.S. Pat. No. 6,472,828 describes a method for controlling fan speed in a projector in order to allow faster bulb turn-on. By running the fan at low speeds initially, the thermal resistance is momentarily higher, allowing the temperature to rise rapidly. The fan speed is then increased to prevent overheating during normal operation. However, the system does not address cool down in the event of line power loss.
- U.S. Pat. No. 5,938,407 addresses an entirely different problem. There, it is desired to keep a coal stove fire as hot as possible in the event of a primary power loss. That system includes two motors that run a fan. The backup motor mechanically engages with the fan, and an alternate power source controlled by a backup circuit. When power is lost, a solenoid is de-energized, depressing a switch and completing the backup circuit to the alternate power source. The backup motor rotates into contact with the fan to ensure uninterrupted airflow. That backup system is for powering an air distribution fan that ensures sufficient oxygen reaches a coal fire burning within a coal stove to maintain the coal fire hot until primary power is restored.
- Many clocks have a battery-backup feature. In this case, time keeping is the issue rather than thermal concerns. Similarly, backup generators and uninterruptible power supplies are commonly used to keep computers and other vital equipment running during a power failure.
- Various thermal fuses and other protection devices exist which cut power to equipment when excessive temperatures are detected. They do not function in the event of a power failure.
- It is an objective of the present invention to provide cooling to high temperature components in electronic equipment in the event of the loss of line power.
- It is another objective of the invention to prevent damage to electrical equipment in the event of the loss of line power as caused by the stored heat of certain high temperature components.
- The electrical equipment containing the invention is provided with an energy storage device. This energy storage device receives and stores energy during normal line-powered operation. When line power is lost, the energy storage device provides power to operate an active cooling system for a period of time sufficient to prevent thermal damage.
- The energy storage device can take one or more forms, including, but not limited to the following: a battery, a capacitor, a spring, a flywheel, a compressed gas, and the like.
- The cooling system can take one or more of a plurality of forms, including, but not limited to the following: a fan, a liquid cooling system, a Peltier device, a refrigeration system, and the like.
-
FIG. 1 is a block diagram of a system using a time-extended cooling apparatus according to the invention. -
FIG. 1 shows aprojector system 100 that uses the invention. It should be understood that the invention can also be used by other heat generating electrical systems and devices. - The projector includes a
heat source 110, i.e., a lamp. The temperature of the lamp can reach several thousand degrees. If the lamp gets too hot, then it can self-destruct, as well as damage nearby components. Therefore, during normal operation, afan 120 is used to cool the lamp. The fan is connected to aprimary power supply 130, normally a power line. - In most modern projectors, the fan will continue to run for several minutes after the projector has been shut off to cool the lamp. However, should there be a failure in the power line, damage can still occur.
- Therefore, the
projector 100 also includes asecondary power supply 140, for example, a rechargeable battery. Should there be a failure in the primary power supply, then aswitch 150 can cause thefan 120 to be operated from the secondary power supply until asensor 160 determines that the lamp has cooled sufficiently. The sensor can also control the speed of the fan to maximize battery lifetime. - In the preferred embodiment, the rechargeable battery is contained in an
accessible compartment 170. The switch or another simple sensor determines the presence or absence of the battery. If the battery is not installed, or the battery is low in charge, an audible or visual warning can be given. Alternatively, a network can be used to send an alert message to a system operator. - An alternative embodiment of the invention embeds the secondary power supply, sensor and switch in the fan. A fan thus configured can be installed in any place where time-extended cooling is required.
- It is possible to use mechanical energy storage devices to the same effect. In another alternative embodiment, the fan is modified to wind a clock spring to a certain tension and maintain it at a given level. When primary power is removed, the spring provides the power to spin the fan for some additional time.
- Although the invention has been described by way of examples of preferred embodiments, it is to be understood that various other adaptations and modifications may be made within the spirit and scope of the invention. Therefore, it is the object of the appended claims to cover all such variations and modifications.
Claims (17)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/638,585 US20050034468A1 (en) | 2003-08-11 | 2003-08-11 | Time-extended cooling system for line-powered apparatus |
JP2004226901A JP2005252220A (en) | 2003-08-11 | 2004-08-03 | Time-extendable cooling system and method of time-extendable cooling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/638,585 US20050034468A1 (en) | 2003-08-11 | 2003-08-11 | Time-extended cooling system for line-powered apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050034468A1 true US20050034468A1 (en) | 2005-02-17 |
Family
ID=34135692
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/638,585 Abandoned US20050034468A1 (en) | 2003-08-11 | 2003-08-11 | Time-extended cooling system for line-powered apparatus |
Country Status (2)
Country | Link |
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US (1) | US20050034468A1 (en) |
JP (1) | JP2005252220A (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060044524A1 (en) * | 2004-08-31 | 2006-03-02 | Feliss Norbert A | System and method for cooling a beam projector |
US20060056142A1 (en) * | 2004-09-10 | 2006-03-16 | Fumikazu Takahashi | Data processing unit and DC backup power supply |
US20060164602A1 (en) * | 2005-01-27 | 2006-07-27 | Subramanian Jayaram | System and method for intelligent information handling system projector cool down |
US20060290206A1 (en) * | 2005-06-27 | 2006-12-28 | Kunihiko Tabei | Fan power supply apparatus and image projection apparatus |
WO2008104026A1 (en) * | 2007-02-28 | 2008-09-04 | Thor Technologies Pty Ltd | Heat protection system for a heat sensitive device |
US20090117843A1 (en) * | 2007-11-02 | 2009-05-07 | Ice Qube, Inc. | Cooling apparatus and method |
US20120013856A1 (en) * | 2007-09-07 | 2012-01-19 | Canon Kabushiki Kaisha | Projection display apparatus |
WO2016029430A1 (en) * | 2014-08-29 | 2016-03-03 | 华为技术有限公司 | Electronic product |
EP2849442B1 (en) * | 2013-09-16 | 2017-03-29 | ameria GmbH | Gesture-controlled rear-projection system |
US9622389B1 (en) | 2007-06-14 | 2017-04-11 | Switch, Ltd. | Electronic equipment data center and server co-location facility configurations and method of using the same |
US9750164B2 (en) | 2007-06-14 | 2017-08-29 | Switch, Ltd. | Facility including externally disposed data center air handling units |
US9788455B1 (en) | 2007-06-14 | 2017-10-10 | Switch, Ltd. | Electronic equipment data center or co-location facility designs and methods of making and using the same |
US9795061B2 (en) | 2013-03-15 | 2017-10-17 | Switch, Ltd. | Data center facility design configuration |
US9823715B1 (en) * | 2007-06-14 | 2017-11-21 | Switch, Ltd. | Data center air handling unit including uninterruptable cooling fan with weighted rotor and method of using the same |
US10028415B1 (en) | 2007-06-14 | 2018-07-17 | Switch, Ltd. | Electronic equipment data center and server co-location facility configurations and method of using the same |
US10888034B2 (en) | 2007-06-14 | 2021-01-05 | Switch, Ltd. | Air handling unit with a canopy thereover for use with a data center and method of using the same |
US11825627B2 (en) | 2016-09-14 | 2023-11-21 | Switch, Ltd. | Ventilation and air flow control with heat insulated compartment |
Citations (9)
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US3866433A (en) * | 1973-09-12 | 1975-02-18 | Jeffreys George C | Auxiliary refrigeration power means |
US3974550A (en) * | 1974-09-25 | 1976-08-17 | Yoshida Kogyo Kabushiki Kaisha | Slide fastener stringer |
US5200644A (en) * | 1988-05-31 | 1993-04-06 | Kabushiki Kaisha Toshiba | Air conditioning system having battery for increasing efficiency |
US5487278A (en) * | 1994-05-06 | 1996-01-30 | Kenneth J. Hartman | Back-up switching system for refrigerator trucks |
US5501083A (en) * | 1993-10-19 | 1996-03-26 | Samsung Electronics Co., Ltd. | Control apparatus and method for an air conditioner compressor |
US5584554A (en) * | 1994-07-11 | 1996-12-17 | E. C. I. Marketing, Inc. | Projector signage and control system |
US5828967A (en) * | 1994-12-28 | 1998-10-27 | Jatco Corporation | Control device for engine compartment cooling |
US5938407A (en) * | 1997-07-28 | 1999-08-17 | Garrett; Donald C. | Battery driven backup system for an air distribution fan |
US6472828B1 (en) * | 2000-06-23 | 2002-10-29 | Infocus Corporation | Control for projector lamp heat dissipation |
-
2003
- 2003-08-11 US US10/638,585 patent/US20050034468A1/en not_active Abandoned
-
2004
- 2004-08-03 JP JP2004226901A patent/JP2005252220A/en active Pending
Patent Citations (9)
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US3866433A (en) * | 1973-09-12 | 1975-02-18 | Jeffreys George C | Auxiliary refrigeration power means |
US3974550A (en) * | 1974-09-25 | 1976-08-17 | Yoshida Kogyo Kabushiki Kaisha | Slide fastener stringer |
US5200644A (en) * | 1988-05-31 | 1993-04-06 | Kabushiki Kaisha Toshiba | Air conditioning system having battery for increasing efficiency |
US5501083A (en) * | 1993-10-19 | 1996-03-26 | Samsung Electronics Co., Ltd. | Control apparatus and method for an air conditioner compressor |
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US5584554A (en) * | 1994-07-11 | 1996-12-17 | E. C. I. Marketing, Inc. | Projector signage and control system |
US5828967A (en) * | 1994-12-28 | 1998-10-27 | Jatco Corporation | Control device for engine compartment cooling |
US5938407A (en) * | 1997-07-28 | 1999-08-17 | Garrett; Donald C. | Battery driven backup system for an air distribution fan |
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Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060044524A1 (en) * | 2004-08-31 | 2006-03-02 | Feliss Norbert A | System and method for cooling a beam projector |
US7589436B2 (en) | 2004-09-10 | 2009-09-15 | Hitachi Computer Peripherals Co., Ltd. | Data processing unit and DC backup power supply |
US20060056142A1 (en) * | 2004-09-10 | 2006-03-16 | Fumikazu Takahashi | Data processing unit and DC backup power supply |
US20060164602A1 (en) * | 2005-01-27 | 2006-07-27 | Subramanian Jayaram | System and method for intelligent information handling system projector cool down |
US7258446B2 (en) * | 2005-01-27 | 2007-08-21 | Dell Products L.P. | System and method for intelligent information handling system projector cool down |
US20060290206A1 (en) * | 2005-06-27 | 2006-12-28 | Kunihiko Tabei | Fan power supply apparatus and image projection apparatus |
WO2008104026A1 (en) * | 2007-02-28 | 2008-09-04 | Thor Technologies Pty Ltd | Heat protection system for a heat sensitive device |
US10356968B2 (en) | 2007-06-14 | 2019-07-16 | Switch, Ltd. | Facility including externally disposed data center air handling units |
US9999166B1 (en) | 2007-06-14 | 2018-06-12 | Switch, Ltd. | Integrated wiring system for a data center |
US11889630B2 (en) | 2007-06-14 | 2024-01-30 | Switch, Ltd. | Data center facility including external wall penetrating air handling units |
US11622484B2 (en) | 2007-06-14 | 2023-04-04 | Switch, Ltd. | Data center exterior wall penetrating air handling technology |
US11435793B2 (en) * | 2007-06-14 | 2022-09-06 | Switch, Ltd. | Data center air handling unit including uninterruptable cooling fan with weighted rotor and method of using the same |
US11275413B2 (en) | 2007-06-14 | 2022-03-15 | Switch, Ltd. | Data center air handling unit including uninterruptable cooling fan with weighted rotor and method of using the same |
US10888034B2 (en) | 2007-06-14 | 2021-01-05 | Switch, Ltd. | Air handling unit with a canopy thereover for use with a data center and method of using the same |
US9622389B1 (en) | 2007-06-14 | 2017-04-11 | Switch, Ltd. | Electronic equipment data center and server co-location facility configurations and method of using the same |
US9750164B2 (en) | 2007-06-14 | 2017-08-29 | Switch, Ltd. | Facility including externally disposed data center air handling units |
US9788455B1 (en) | 2007-06-14 | 2017-10-10 | Switch, Ltd. | Electronic equipment data center or co-location facility designs and methods of making and using the same |
US10356939B2 (en) | 2007-06-14 | 2019-07-16 | Switch, Ltd. | Electronic equipment data center or co-location facility designs and methods of making and using the same |
US9823715B1 (en) * | 2007-06-14 | 2017-11-21 | Switch, Ltd. | Data center air handling unit including uninterruptable cooling fan with weighted rotor and method of using the same |
US9986652B1 (en) | 2007-06-14 | 2018-05-29 | Switch, Ltd. | Facility including externally disposed data center air handling units |
US10178796B2 (en) | 2007-06-14 | 2019-01-08 | Switch, Ltd. | Electronic equipment data center or co-location facility designs and methods of making and using the same |
US10028415B1 (en) | 2007-06-14 | 2018-07-17 | Switch, Ltd. | Electronic equipment data center and server co-location facility configurations and method of using the same |
US9039206B2 (en) * | 2007-09-07 | 2015-05-26 | Canon Kabushiki Kaisha | Projection display apparatus to store data using capacitor charges |
US20120013856A1 (en) * | 2007-09-07 | 2012-01-19 | Canon Kabushiki Kaisha | Projection display apparatus |
US8070569B2 (en) | 2007-11-02 | 2011-12-06 | Ice Qube, Inc. | Cooling apparatus and method |
US20090117843A1 (en) * | 2007-11-02 | 2009-05-07 | Ice Qube, Inc. | Cooling apparatus and method |
US9795061B2 (en) | 2013-03-15 | 2017-10-17 | Switch, Ltd. | Data center facility design configuration |
EP2849442B1 (en) * | 2013-09-16 | 2017-03-29 | ameria GmbH | Gesture-controlled rear-projection system |
US10130005B2 (en) | 2014-08-29 | 2018-11-13 | Huawei Technologies Co., Ltd. | Electronic product |
CN105766072A (en) * | 2014-08-29 | 2016-07-13 | 华为技术有限公司 | Electronic product |
WO2016029430A1 (en) * | 2014-08-29 | 2016-03-03 | 华为技术有限公司 | Electronic product |
US11825627B2 (en) | 2016-09-14 | 2023-11-21 | Switch, Ltd. | Ventilation and air flow control with heat insulated compartment |
Also Published As
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Legal Events
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AS | Assignment |
Owner name: MITSUBISHI ELECTRIC INFORMATION TECHNOLOGY CENTER Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DIETZ, PAUL H.;LEIGH, DARREN L.;REEL/FRAME:014400/0286;SIGNING DATES FROM 20030806 TO 20030811 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |
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AS | Assignment |
Owner name: MITSUBISHI ELECTRIC RESEARCH LABORATORIES, INC., M Free format text: TO CORRECT AN ERROR IN A COVER SHEET PREVIOUSLY RECORDED AT REEL 014400 FRAME 0286. CORRECTION OF ASSIGNEE'S NAME.;ASSIGNORS:DIETZ, PAUL H.;LEIGH, DARREN L.;REEL/FRAME:020009/0222;SIGNING DATES FROM 20030806 TO 20030811 |