US20030089118A1 - Evacuation port and closure for dewars - Google Patents
Evacuation port and closure for dewars Download PDFInfo
- Publication number
- US20030089118A1 US20030089118A1 US09/765,178 US76517801A US2003089118A1 US 20030089118 A1 US20030089118 A1 US 20030089118A1 US 76517801 A US76517801 A US 76517801A US 2003089118 A1 US2003089118 A1 US 2003089118A1
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- United States
- Prior art keywords
- dewar
- evacuation
- evacuation port
- cap
- tool
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/005—Details of vessels or of the filling or discharging of vessels for medium-size and small storage vessels not under pressure
- F17C13/006—Details of vessels or of the filling or discharging of vessels for medium-size and small storage vessels not under pressure for Dewar vessels or cryostats
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/08—Vessels not under pressure with provision for thermal insulation by vacuum spaces, e.g. Dewar flask
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/03—Thermal insulations
- F17C2203/0391—Thermal insulations by vacuum
- F17C2203/0395—Getter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
- F17C2203/0602—Wall structures; Special features thereof
- F17C2203/0612—Wall structures
- F17C2203/0626—Multiple walls
- F17C2203/0629—Two walls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2209/00—Vessel construction, in particular methods of manufacturing
- F17C2209/23—Manufacturing of particular parts or at special locations
- F17C2209/234—Manufacturing of particular parts or at special locations of closing end pieces, e.g. caps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/01—Improving mechanical properties or manufacturing
- F17C2260/013—Reducing manufacturing time or effort
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/05—Applications for industrial use
- F17C2270/0509—"Dewar" vessels
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- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49016—Antenna or wave energy "plumbing" making
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49863—Assembling or joining with prestressing of part
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49885—Assembling or joining with coating before or during assembling
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49908—Joining by deforming
- Y10T29/49925—Inward deformation of aperture or hollow body wall
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Containers, Films, And Cooling For Superconductive Devices (AREA)
- Pressure Vessels And Lids Thereof (AREA)
Abstract
Description
- The present invention relates generally to dewars for high temperature superconducting (HTS) filter systems for use in, for example, cellular PCS systems and, more particularly, an evacuation port and closure for such dewars.
- Recently, substantial attention has been devoted to the development of high temperature superconducting radio frequency (RF) filters for use in, for example, cellular telecommunications systems. Those skilled in the art will appreciate that, when multiple HTS filters are deployed, for example, within a dewar cooled by a cryocooler, on a telecommunications tower, substantial durability and reliability issues may arise. For example, when a system is to be mounted at the top of a tower, the system must be able to withstand significant changes in climate and weather, and the system must be reliable and require minimal maintenance.
- In this regard, the final step in manufacturing a durable, long life dewar, i.e., a dewar having a life span greater than 10 years, is to vacuum bake the dewar at as high a temperature as possible to degas the dewar and its components, which include temperature sensors, HTSC RF filters, getters, etc., without damaging these components and impacting their functional capability. While the dewar is baked, it is attached to a vacuum pump via a tip-off tube and evacuated. The vacuum pump will reduce the pressure within the dewar to less than 10−4 torr and typically to less than 10−8 torr at the time the tip-off tube is pinched off to seal the dewar. At these low pressures, the gas molecules that are outgassing from the dewar and its components will move in straight lines until the gas molecules strike a wall of the dewar or component, or another gas molecule. The gas molecules will be removed or evacuated from the dewar as they find the inside of the tip-off tube. Because the tip-off tube typically has a relative small inside diameter to minimize the size or footprint of the dewar, the degassing process tends to be quite time consuming. Typically, the dewar is vacuum baked for several days until the outgassing decreases to an acceptable level.
- With the increased demand from the cellular telecommunications industry for these dewar deployed HTS filters, dewar manufacturers must find ways to increase the supply of these dewars at lower costs. Because the vacuum baking of the dewars is the most time intensive step of the manufacturing process, one option to increase the output of dewars would be to invest in more automated vacuum bakeout equipment. However, automated vacuum bakeout equipment is very expesnsive and, thus, this option is not necessarily the most desirable. Another option would be to reduce the time required to vacuum bake the dewars by increasing the rate at which the gas molecules are evacuated from the dewar. Because the gas molecules are only evacuated as they find the inside of the tip-off tube, the rate at which the gas molecules were evacuated would increase if the size of the tip-off tube were increased. However, because the length of the tip-off tube, or distance from the dewar at which the tip-off tube is pinched off, is directly proportional to the diameter of the tip-off tube, this option would result in an undesirable increase in the overall size or profile of these dewars.
- Thus, it would be desirable to increase the manufacturing output of these dewar deployed HTS filters without drastically increasing a manufacturers capital equipment investment or increasing the size of the dewar.
- The present invention is directed to an improved dewar for high temperature superconducting RF filter systems and process for manufacturing the same. In a particularly innovative aspect, a dewar in accordance with the present invention includes an oversized evacuation port, which may be greater in size by about a factor of ten than the size of an evacuation port of a conventional dewar, without increasing its overall size or profile. The incorporation of an oversized evacuation port is particularly advantageous from a manufacturing standpoint in that the time it takes to vacuum bake the dewar is substantially reduced. Specifically, there is a greater probability that the gas molecules being outgassed from the dewar and its components will find the inside diameter of a larger evacuation port and, thus, will be more quickly evacuated from the dewar. Moreover, a dewar in accordance with the present invention comprises a low profile cap that seals the evacuation port.
- Prior to vacuum baking the dewar, a re-useable evacuation tool is coupled to the evacuation port of the dewar. The tool includes a housing, a capping tool positioned in the housing, and a side arm extending from the housing, which is attachable to a vacuum pump. The tool is advantageously bakeable up to a temperature of 100° C. to 125° C. Once the vacuum bakeout process is completed, the capping tool is actuated to cold weld the low profile cap to the tip-off flange on the end of the evacuation port and hermetically seals the dewar.
- Other objects and features of the present invention will become apparent from consideration of the following description taken in conjunction with the accompanying drawings.
- FIG. 1 is a cross-sectional view of a typical dewar of the prior art that has high temperature superconductor RF filter assemblies thermally attached to a heatsink.
- FIG. 2A is a plan view of a tip-off tube of the prior art that has been pinched off.
- FIG. 2B is a partial cross-sectional view of the tip-off tube shown in FIG. 2A taken along
line 2B-2B. - FIG. 3 is a partial plan view of a cap port and evacuation tool of the present invention, wherein the evacuation tool is attached to the tip-off flange of a dewar.
- FIG. 4 is a partial plan view of the cap port captured by the evacuation tool.
- Turning now to the drawings, FIG. 1 provides a cross-sectional view of a
typical dewar 10 of the prior art. Thedewar 10 includes a hermetically sealed cylindrical drum-like housing 11 preferably formed from stainless steel. Aheatsink 12, to which high temperature superconductor (HTS) RF filter assemblies (not shown) are thermally attached, is fixed in place within the housing 11 via a series ofstruts 13 which attach to a series ofsupports 19 embedded in the housing 11. Theheatsink 12 is cooled by a closed cycle cryogenic cooler (not shown) that thermally interfaces to adewar coldfinger 14 through asupply tube 15. Thesupply tube 15, which extends through the base of the housing 11, includes aflange 16 that mates to a cryo-cooler flange (not shown). Thedewar 10 also typically includes a series ofDC power connectors 18, a series ofRF connectors 17, and agetter 20. Lastly, a tip-offtube 24, which is typically formed from annealed copper tubing, is brazed to mate with anevacuation port 22. - A final step in the process of manufacturing a
durable dewar 10 with a life expectancy of 10 years or more, is to vacuum bake thedewar 10 at as high a temperature as possible to degas thedewar 10 and its components, which include temperature sensors, HTSC RF filters, getters, etc., without damaging these components and impacting their functional capability. While thedewar 10 is baked, the tip-offtube 24 is attached to a vacuum pump (not shown) to evacuate thedewar 10. The vacuum pump will reduce the pressure within thedewar 10 to less than 10−4 torr and typically to less than 10−8 torr at the time the tip-offtube 24 is pinched off, i.e. squeezed between two rollers that cause the copper tubing of the tip-offtube 24 to cold weld to itself, to create a hermetic seal (see FIGS. 2A and 2B). At these low pressures, the gas molecules that are outgassing from thedewar 10 and its components will move in straight lines until the gas molecules strike a wall of thedewar 10 or component, or another gas molecule. The gas molecules will be removed or evacuated from thedewar 10 as they find the inside of the tip-offtube 24. The larger the inside diameter of the tip-offtube 24, the easier it is for the molecules to be removed by the vacuum pump. However, because the distance from thedewar 10 at which the tip-offtube 24 can be pinched-off is directly proportional to the diameter of the tip-offtube 24, and because it is desirable to minimize the dewar's 10 profile, the tip-offtube 24 typically has a relative small inside diameter. As a result, the degassing process tends to be quite time consuming as the gas molecules slowly find the inside of the small diameter tip-offtube 24. Typically, thedewar 10 is vacuum baked for several days until the outgassing decreases to an acceptable level. - To accelerate the vacuum baking step of the manufacturing process, the evacuation port of a dewar of the present invention has a cross-sectional area that is significantly larger than the cross-sectional area of the tip-off tube of a conventional dewar. Moreover, a dewar evacuation port according to the present invention can be increased in size by a factor of ten over the conventional dewar evacuation port without increasing the overall size or profile of the dewar. Increasing the cross-sectional area of the evacuation port significantly increases the probability that a gas molecule will be removed by the vacuum pump and, thus, shortens the time the dewar must be vacuum baked.
- Turning to FIG. 3, the dewar110 of the present invention includes a large
diameter evacuation port 122 that extends from the housing 111 of the dewar 110. A tip-off flange 126 is formed on the end of theevacuation port 122. Areusable evacuation tool 130, which is used to evacuate the dewar 110 and seal its largediameter evacuation port 122, is coupled to the dewar 110. Theevacuation tool 130 is advantageously bakeable at a temperature of up to 125° C. and comprises metallic surfaces that are low outgassing. Theevacuation tool 130 includes an elongatedcylindrical housing 132 and a cylindrical side arm orvacuum port 138 that opens into thehousing 132 and extends from thehousing 132 to a vacuum pump (not shown). Aflange 134 is formed on the end of thehousing 132 adjacent the dewar 110 and is coupled to the tip-offflange 126 of the dewar 110 with a clamp (not shown). A vacuum seal is maintained between the tip-offflange 126 and theflange 134 of the evacuation tool by a low outgassing o-ring 136 such as a Viton® or Kal Rez™ (Dupont trademarks) o-ring. The other end of thehousing 132 is sealed with acover 131. - The
evacuation tool 130 includes acapping tool 140 used to cap theevacuation port 122 on the dewar 110. Thecapping tool 140 includes a clampingknob 141 connected to an elongated threadedshaft 142 that slidably extends through the threaded section ofcover 131 of theevacuation tool 130. Theshaft 142, which includes atooling ball 146 attached to its end, is mechanically coupled to atooling head 148 and a diaphragm bellows 144. Thetooling ball 146 is rotatably captured in atooling seat 150 of thetooling head 148. Rotation of the clampingknob 141 and, hence, theshaft 142, of thecapping tool 140 causes thebellows 144 to linearly expand or contract without rotating. Expansion of thebellows 144 causes theshaft 142 to extend into thehousing 132 and forces thetooling head 148 toward theflange 134 end of theevacuation tool 130. Rotation of the clampingknob 141 in the opposite direction causes the bellows to linearly contract, which causes theshaft 142 to withdraw from thehousing 132 and thetooling head 148 to withdraw toward thecover 131 end of theevacuation tool 130. - A preferably low profile port cap158 (see, in detail, FIG. 4) is releasably captured by the
tooling head 148. Thetooling head 148 is substantially cup shaped having a base 147 andsidewall 149 defining a holdingarea 145.Hardened CRES balls 154 are mounted in retainingcavities 157 formed in theside wall 149 of thetooling head 148, such that only a portion of theCRES balls 154 extend into the holdingarea 145 of thetooling head 148 to engage arecess 153 formed in the perimeter of ahead portion 155 of theport cap 158. TheCRES balls 154 are lightly loaded with disc orcoil springs 152 to releasably retain theport cap 158. Spring covers 156 hold the disc springs 152 in the retainingcavities 157. - The
surface 160 of theport cap 158 that makes contact with the tip-offflange 126 is preferably electroplated with alayer 161 of indium metal. Thelayer 161 of indium metal is preferably 0.002 to 0.010 inches thick. Alternatively, the indium metal may be in the form of an o-ring or washer attached to thesurface 160 of theport cap 158. Because indium is a very soft, compliant metal and because the mating surfaces of theindium layer 161 and the tip-offflange 126 are very clean after being vacuum baked over several days at a temperature of about 100° C. to 125° C., theindium layer 161 and tip-offflange 126 are easily cold welded when pressure is applied. - In operation, the
evacuation tool 130 is connected to the dewar 110 by clamping theflange 134 of theevacuation tool 130 to the tip-offflange 126 of the dewar 110. Theevacuation tool 130 is placed in an open position, as shown in FIG. 3, with thetooling head 148 andport cap 158 withdrawn toward thecover 131 end of thehousing 132. Thevacuum port 138 is attached to a vacuum pump (not shown). While the dewar 110 andtool 130 are baked at a temperature of about 100° C. to 125° C., the vacuum pump is operated to evacuate the gas molecules through the opening ofevacuation port 122 and tip-offflange 126 and create a vacuum “V” within the dewar 110. The opening in theevacuation port 122 and tip-offflange 126 is preferably about 1.57 inches in diameter. Such a large opening will tend to reduce the vacuum baking time necessary to sufficiently evacuate the gas molecules being outgassed from the dewar 110 and its components. - When the vacuum baking process is completed, the
evacuation tool 130 is used to hermetically seal the opening of the tip-offflange 126 of the dewar 110. The clampingknob 141 of thecapping tool 140 is rotated to expand thebellows 144. The bellows 144 is expanded until theevacuation tool 130 is effectively closed and theevacuation port 122 of the dewar 110 is sealed by cold welding theindium layer 161 of theport cap 158 to the tip-offflange 126. - With the
evacuation tool 130 closed and theevacuation port 122 sealed, atmospheric pressure enters thehousing 132 of thetool 130 throughvacuum port 138 by opening a valve at the vacuum pump to atmosphere. As a result, atmospheric pressure is asserted on theport cap 158 to hold it in place. With thecap 158 of the preferred embodiment at atmospheric pressure, i.e., 14.7 pounds per square inch, more than 28.4 pounds of force is applied to thecap 158 which has a diameter greater than the 1.57 inch diameter opening of the tip-offflange 126. As a result, when the clampingknob 141 is rotated to open theevacuation tool 130 by contracting thebellows 144, the atmospheric pressure exerted on theport cap 158 overcomes the pressure exerted by theCRES balls 154 and disk springs 152, and causes theport cap 158 to disconnect from thetooling head 148 and remain connected to the dewar 110. With theport cap 158 hermetically sealed to the dewar 110, the clamp physically holding theevacuation tool 130 to the tip-offflange 126 is removed to remove theevacuation tool 130. - While the invention is susceptible to various modifications and alternative forms, a specific example thereof has been shown in the drawings and is herein described in detail. It should be understood, however, that the invention is not to be limited to the particular form disclosed, but to the contrary, the invention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the appended claims.
Claims (19)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US09/765,178 US6568194B1 (en) | 2001-01-17 | 2001-01-17 | Evacuation port and closure for dewars |
PCT/US2002/003081 WO2002099331A2 (en) | 2001-01-17 | 2002-01-16 | Evacuation port and closure for dewars |
US10/421,559 US6772498B2 (en) | 2001-01-17 | 2003-04-22 | Method of manufacturing dewars |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/765,178 US6568194B1 (en) | 2001-01-17 | 2001-01-17 | Evacuation port and closure for dewars |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/421,559 Division US6772498B2 (en) | 2001-01-17 | 2003-04-22 | Method of manufacturing dewars |
Publications (2)
Publication Number | Publication Date |
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US20030089118A1 true US20030089118A1 (en) | 2003-05-15 |
US6568194B1 US6568194B1 (en) | 2003-05-27 |
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ID=25072857
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US09/765,178 Expired - Fee Related US6568194B1 (en) | 2001-01-17 | 2001-01-17 | Evacuation port and closure for dewars |
US10/421,559 Expired - Fee Related US6772498B2 (en) | 2001-01-17 | 2003-04-22 | Method of manufacturing dewars |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US10/421,559 Expired - Fee Related US6772498B2 (en) | 2001-01-17 | 2003-04-22 | Method of manufacturing dewars |
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US (2) | US6568194B1 (en) |
WO (1) | WO2002099331A2 (en) |
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CN102155385A (en) * | 2011-03-22 | 2011-08-17 | 菏泽市花王高压容器有限公司 | Evacuation device of low-temperature insulated liquid storage tank |
US9822931B2 (en) | 2012-12-17 | 2017-11-21 | Westport Power Inc. | Method and apparatus for servicing a tank, a plug, or a tank and plug |
CN109099309A (en) * | 2018-06-20 | 2018-12-28 | 清华大学 | Cryogenic vacuum experimental facilities |
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US6568194B1 (en) * | 2001-01-17 | 2003-05-27 | Superconductor Technologies, Inc. | Evacuation port and closure for dewars |
AT501186B1 (en) | 2004-07-28 | 2006-11-15 | Konstantin Technologies Gmbh | TRANSFER IMMEDIATE |
CN102353456B (en) * | 2011-08-30 | 2013-08-14 | 中国科学院上海技术物理研究所 | Infrared detector Dewar component space on-track vacuum processing device and realization method thereof |
EP2796764B1 (en) * | 2013-04-26 | 2018-11-28 | SOL S.p.A. | Device for maintenance of vacuum isolated cryogenic containers |
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US5488831A (en) * | 1994-10-06 | 1996-02-06 | Griswold; Thomas A. | Liquid cryogen withdrawal device |
DE19520506A1 (en) * | 1995-06-03 | 1996-12-05 | Bosch Gmbh Robert | Cooling device for a high frequency receiver |
US5611207A (en) * | 1995-06-29 | 1997-03-18 | Hess; John | Cryogenic interface for perpendicular loading of independent measurement inserts |
US5966945A (en) * | 1998-06-05 | 1999-10-19 | Mengel; Edward M. | Universal focal plane dewar assembly |
US6112526A (en) * | 1998-12-21 | 2000-09-05 | Superconductor Technologies, Inc. | Tower mountable cryocooler and HTSC filter system |
US6568194B1 (en) * | 2001-01-17 | 2003-05-27 | Superconductor Technologies, Inc. | Evacuation port and closure for dewars |
-
2001
- 2001-01-17 US US09/765,178 patent/US6568194B1/en not_active Expired - Fee Related
-
2002
- 2002-01-16 WO PCT/US2002/003081 patent/WO2002099331A2/en not_active Application Discontinuation
-
2003
- 2003-04-22 US US10/421,559 patent/US6772498B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102155385A (en) * | 2011-03-22 | 2011-08-17 | 菏泽市花王高压容器有限公司 | Evacuation device of low-temperature insulated liquid storage tank |
US9822931B2 (en) | 2012-12-17 | 2017-11-21 | Westport Power Inc. | Method and apparatus for servicing a tank, a plug, or a tank and plug |
CN109099309A (en) * | 2018-06-20 | 2018-12-28 | 清华大学 | Cryogenic vacuum experimental facilities |
Also Published As
Publication number | Publication date |
---|---|
US20030196311A1 (en) | 2003-10-23 |
US6568194B1 (en) | 2003-05-27 |
WO2002099331A2 (en) | 2002-12-12 |
WO2002099331A3 (en) | 2003-07-17 |
US6772498B2 (en) | 2004-08-10 |
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