US20070051115A1 - Cryostat configuration with cryocooler and gas gap heat transfer device - Google Patents

Cryostat configuration with cryocooler and gas gap heat transfer device Download PDF

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Publication number
US20070051115A1
US20070051115A1 US11/171,423 US17142305A US2007051115A1 US 20070051115 A1 US20070051115 A1 US 20070051115A1 US 17142305 A US17142305 A US 17142305A US 2007051115 A1 US2007051115 A1 US 2007051115A1
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United States
Prior art keywords
cold
cryostat configuration
cryocooler
cold head
cryostat
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
Application number
US11/171,423
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English (en)
Inventor
Andreas Kraus
Beat Mraz
Johannes Boesel
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Bruker Biospin SAS
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Bruker Biospin SAS
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Assigned to BRUKER BIOSPIN AG reassignment BRUKER BIOSPIN AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOESEL, JOHANNES, KRAUS, ANDREAS, MRAZ, BEAT
Publication of US20070051115A1 publication Critical patent/US20070051115A1/en
Abandoned legal-status Critical Current

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    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
    • F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
    • 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
    • F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
    • F25D19/006—Thermal coupling structure or interface
    • 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
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/14—Compression machines, plants or systems characterised by the cycle used 
    • F25B2309/1408—Pulse-tube cycles with pulse tube having U-turn or L-turn type geometrical arrangements
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/17—Re-condensers
    • 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
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/10—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point with several cooling stages

Definitions

  • the invention concerns a cryostat configuration for keeping liquid helium, comprising an outer jacket and a helium container installed therein, wherein the helium container is connected to the outer jacket via at least two suspension tubes, and with a neck tube whose upper warm end is connected to the outer jacket and whose lower cold end is connected to the helium container, as well as a multi-stage cold head of a cryocooler, wherein the outer jacket, the helium container, the suspension tubes and the neck tube delimit an evacuated space, and wherein the helium container is surrounded by at least one radiation shield which is connected in a thermally conducting fashion to the suspension tubes and to a contact surface on the neck tube of the helium container.
  • One possibility of integrating the cold head of a cryocooler in a cryostat configuration is to install the e.g. two-stage cold head in a separate vacuum chamber (as described e.g. in U.S. Pat. No. 5,613,367) or directly in the vacuum chamber of the cryostat (as described e.g. in U.S. Pat. No. 5,563,566) such that the first cold stage of the cold head is rigidly connected to a radiation shield and the second cold stage is connected in a heat-conducting manner to the helium container, either directly or via a fixed, rigid or flexible thermal bridge.
  • the overall heat input into the helium container can be compensated for by re-condensation of the helium, which is evaporated due to external heat input, on the cold contact surface in the helium container to obtain loss-free operation of the system.
  • the connection between the second cold stage and the helium container generally has a thermal resistance which cannot be neglected, and vibrations of this cold stage may furthermore be transferred to the helium container.
  • WO03036207 and WO03036190 therefore propose insulating the cold head tubes.
  • vibrations in the second cold stage of the cold head of the cryocooler are not transferred to the helium container if the cold head is installed directly in the neck tube connected to the helium container.
  • a solid thermal bridge is conventionally used between the first cold stage of the cold head and the radiation shield. This thermal connection should be as “soft” as possible to minimize transfer of vibrations.
  • thin foil packets or wire-braids made from copper or aluminium are generally used.
  • a gas gap disposed between one or more cold stages of the cold head and one or more contact surfaces in the neck tube that are each connected in a heat-conducting manner to a radiation shield via a fixed, rigid or flexible thermal bridge, wherein heat from the respective radiation shield is guided via the gas gap into the corresponding cold stage of the cold head.
  • Heat transfer from a radiation shield to a cold stage of the cold head is therefore effected via a gas gap by guiding the heat transmitted to the radiation shield via the gas gap to the cold head.
  • the inventive cryostat configuration has no fixed connection between the cold stage(s) of the cold head of the cryocooler and the radiation shield(s) such that transmission of vibrations from the cold head to the radiation shield(s) is largely eliminated, while nevertheless ensuring good thermal contact between the cold head and the radiation shield(s).
  • the cryocooler is advantageously a pulse tube cooler, since pulse tube coolers can be operated with extremely low vibration.
  • cryocoolers such as e.g. Gifford-McMahon coolers can also be used.
  • helium can be liquefied at the coldest stage at a temperature of 4.2 K or less to provide a plurality of different applications in region of very low temperatures.
  • the helium which is evaporated within the cryostat is liquefied at the cold stage which is freely suspended in the neck tube, and drips back into the helium container. This reduces helium loss and the number of refilling processes or permits no-loss operation if the cooling power of the cooler is large enough.
  • the transmission of vibrations from the cold stage to the helium container is also completely eliminated, since the coldest cold stage of the cold head is not connected to the cryostat configuration via a solid bridge.
  • the tubes of the cold head above the first cold stage and possibly also in the region of further cold stages are surrounded by thermal insulation to eliminate or at least reduce undesired heat input from the neck tube into the tubes of the cold head.
  • the tubes above the first cold stage of the cold head have temperatures between room temperature and the temperature of the first cold stage.
  • the width of the gas gap can be adjusted.
  • the temperature of the radiation shield can thereby be adjusted as desired.
  • the areas of the opposing surfaces which delimit the gas gap and transfer heat can advantageously be extended by providing fins.
  • the colder heat transfer surface is rigidly connected to the cold stage;of the cryocooler cold head and is disposed above the warmer heat transfer surface to provide a precondition for forming natural convection gas flow.
  • the warmer heat transfer surface is thereby in contact with the neck tube of the helium container.
  • the width of the gas gap can be enlarged until a natural convection flow is obtained in the gas gap.
  • a flow through the gas gap may be externally activated to improve heat transfer.
  • the radiation shield or one of the radiation shields includes a container with liquid nitrogen, wherein the nitrogen is at least partially reliquefied after evaporation due to thermal connection between the radiation shield and the cold head of the cryocooler.
  • the radiation shield is not directly cooled by the cooler but indirectly via the evaporating nitrogen.
  • a preferably electric heater is provided in the nitrogen container or in contact therewith, to keep the pressure in the nitrogen container at a constant value above the surrounding pressure in case of surplus cooling capacity of the cryocooler.
  • a preferably electric heater is provided in the helium container or in contact therewith to keep the pressure in the helium container at a constant value above the surrounding pressure in case of surplus cooling capacity of the cryocooler. It is, however, also feasible to control the power of the cooler via its operating frequency and/or the amount of the working gas (i.e. the gas pressure) in the cooler.
  • cryostat configuration contains a superconducting magnet arrangement, in particular, if the superconducting magnet arrangement is part of a magnetic resonance apparatus, in particular, magnetic resonance imaging (MRI) or nuclear magnetic resonance spectroscopy (NMR).
  • MRI magnetic resonance imaging
  • NMR nuclear magnetic resonance spectroscopy
  • FIG. 1 shows a schematic view of an inventive cryostat configuration
  • FIG. 2 a shows a schematic view of a cold head of a cryocooler of an inventive cryostat configuration, which is disposed in a neck tube;
  • FIG. 2 b shows a schematic view of a cold head of a cryocooler of an inventive cryostat configuration, disposed in a neck tube, with contact surfaces having fins;
  • FIG. 3 shows a schematic view of an inventive cryostat configuration with a nitrogen tank.
  • FIG. 1 shows an embodiment of the inventive cryostat configuration with an outer jacket 1 and a helium container 2 disposed therein.
  • the helium container is connected to the outer jacket 1 via suspension tubes 3 .
  • a two-stage cold head 7 of a cryocooler is installed in a neck tube 4 whose upper warm end 5 is connected to the outer jacket 1 and whose lower cold end 6 is connected to the helium container 2 .
  • the helium container 2 is surrounded by a radiation shield 8 which is connected in a heat-conducting manner to the suspension tubes 3 and also to a contact surface 9 on the neck tube 4 of the helium container 2 .
  • the cold head 7 is slightly lifted to produce a gas gap 13 between a cold surface 10 on the first cold stage 11 of the cold head 7 and the neck tube 4 contact surface 9 which is connected in a heat-conducting manner to the radiation shield 8 via a fixed thermal bridge 12 .
  • Heat is transferred from the radiation shield 8 to the cold stage 11 of the cold head 7 via the narrow gas gap 13 , thereby avoiding solid connection between the cold stage 11 of the cold head 7 and the radiation shield 8 .
  • the heat ⁇ dot over (Q) ⁇ which impinges on the radiation shield 8 must be transferred through the gas gap 13 of width L to the cold head 7 of the cryocooler.
  • Q . k m L ⁇ A ⁇ ⁇ ⁇ ⁇ ⁇ T ⁇ with k m being the average thermal conductivity of the fluid, A the transmission surface, and ⁇ T the temperature difference between the warm surface (contact surface 9 ) and the cold surface 10 . Since the thermal conductivity of helium gas is much smaller than that of most solids, such as e.g.
  • the temperature difference between the radiation shield 8 and the first cold stage 11 of the cold head 7 increases when lifting the cold head, and the temperature of the radiation shield 8 rises.
  • the distance between the two surfaces 9 , 10 is advantageously kept at a minimum. If desired, the shield temperature can be easily adjusted via the width of the gas gap 13 .
  • FIGS. 2 a and 2 b each show a cold head 7 of a cryocooler of an inventive cryostat configuration, which is disposed in a neck tube 4 .
  • FIG. 2 a shows a smooth contact surface 9
  • FIG. 2 b shows an embodiment of the present invention with which the contact surface 9 is extended by additional structures 14 .
  • Such an increase can be obtained e.g. through fins or similar structures.
  • the cold head 7 In the region of the first cold stage with temperatures between room temperature and the temperature of the first cold stage 11 , the cold head 7 is provided with a thermal insulation 15 .
  • the tubes of further cooling stages may also be thermally insulated.
  • heat is transferred in the gas gap 13 through convection in addition to conduction.
  • Convection can be forced from the outside or occurs freely if the gas gap 13 and temperature difference ⁇ T are sufficiently large (free or natural convection).
  • the precondition therefore is, however, that the colder surface 10 which is in contact with the cold head 7 , is disposed above the warmer surface (contact surface 9 ) which is in contact with the radiation shield.
  • the simple structure of the neck tube 4 is another advantage of the invention. Bores for screwing the contact surfaces 9 and 10 are e.g. not required. Installation and removal of the cold head 7 is possible in a simple and rapid fashion.
  • the radiation shield 8 may also be indirectly cooled using liquid nitrogen as shown in FIG. 3 , similar to a non-actively cooled system (i.e. without cryocooler).
  • the first cold stage 11 of the cold head 7 of the cryocooler must be connected in a heat-conducting manner to the nitrogen container 16 via a gas gap 13 such that evaporated nitrogen can be reliquefied.
  • the inventive cryostat configuration of FIG. 3 also has a heater 18 disposed in the helium container 2 and a heater 19 in the nitrogen container 16 .
  • the heaters 18 , 19 keep the pressure in the helium container 2 and in the nitrogen container 16 at a constant value above the surrounding pressure.
  • the heaters 18 , 19 may also be disposed outside of the containers as long as thermal contact with the respective liquids is provided.
  • the inventive cryostat configuration permits coupling between the cold stages of the cold head 7 of the cryocooler and the cryostat configuration, wherein no detectable vibrations of the cold stages of the cold head 7 get into the cryostat, while nevertheless ensuring sufficient heat transfer.
  • the cryostat configuration is therefore particularly suited for cooling a magnet arrangement 20 which is part of an apparatus for magnetic resonance, in particular magnetic resonance imaging (MRI) or nuclear magnetic resonance spectroscopy (NMR).
  • MRI magnetic resonance imaging
  • NMR nuclear magnetic resonance spectroscopy

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Containers, Films, And Cooling For Superconductive Devices (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US11/171,423 2004-07-17 2005-07-01 Cryostat configuration with cryocooler and gas gap heat transfer device Abandoned US20070051115A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004034729A DE102004034729B4 (de) 2004-07-17 2004-07-17 Kryostatanordnung mit Kryokühler und Gasspaltwärmeübertrager
DE102004034729.8 2004-07-17

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EP (1) EP1617157A3 (fr)
JP (1) JP2006054444A (fr)
DE (1) DE102004034729B4 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100162731A1 (en) * 2008-09-22 2010-07-01 Oxford Instruments Superconductivity Limited Cryogenic cooling apparatus and method using a sleeve with heat transfer member
US20130118184A1 (en) * 2009-06-18 2013-05-16 Carl Zeiss Nts, Llc Cooled charged particle systems and methods
US20150348689A1 (en) * 2013-01-06 2015-12-03 Institute Of Electrical Engineering, Chinese Academy Of Sciences Superconducting Magnet System for Head Imaging
US20160055949A1 (en) * 2013-03-27 2016-02-25 Japan Superconductor Technology Inc. Cryostat
DE102016218000B3 (de) * 2016-09-20 2017-10-05 Bruker Biospin Gmbh Kryostatenanordnung mit einem Vakuumbehälter und einem zu kühlenden Objekt, mit evakuierbarem Hohlraum
US9982840B2 (en) 2014-09-30 2018-05-29 Bruker Biospin Gmbh Cooling device with cryostat and cold head having reduced mechanical coupling
US10352501B2 (en) 2015-07-01 2019-07-16 Bruker Biospin Gmbh Cryostat with active neck tube cooling by a second cryogen
CN112133514A (zh) * 2019-06-25 2020-12-25 布鲁克瑞士股份公司 具有弹簧弹性的、导热的连接元件的低温恒温器组件
CN112236036A (zh) * 2018-05-20 2021-01-15 阿贝亚技术有限责任公司 低温存储单元
CN112402751A (zh) * 2020-09-04 2021-02-26 湖北贵族真空科技股份有限公司 热桥式液氧呼吸器
CN114637349A (zh) * 2022-03-04 2022-06-17 中国科学院电工研究所 一种液氦温区恒温装置及恒温控制方法
US11808504B2 (en) 2019-05-20 2023-11-07 Sumitomo Heavy Industries, Ltd. Cryogenic device and cryostat
CN117048653A (zh) * 2023-10-12 2023-11-14 西南交通大学 一种用于超导磁悬浮列车的低温恒温装置及方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007194258A (ja) * 2006-01-17 2007-08-02 Hitachi Ltd 超伝導磁石装置
JP5833284B2 (ja) * 2006-03-17 2015-12-16 シーメンス ピーエルシー 冷却装置
EP3798625A4 (fr) * 2018-05-23 2022-03-23 Nippon Steel Corporation Appareil de génération de champ magnétique et procédé de magnétisation d'un appareil de génération de champ magnétique

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US5317879A (en) * 1992-10-28 1994-06-07 General Electric Company Flexible thermal connection system between a cryogenic refrigerator and an mri superconducting magnet
US5331735A (en) * 1993-04-28 1994-07-26 General Electric Company Method of forming a flexible connector
US5461873A (en) * 1993-09-23 1995-10-31 Apd Cryogenics Inc. Means and apparatus for convectively cooling a superconducting magnet
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US5613367A (en) * 1995-12-28 1997-03-25 General Electric Company Cryogen recondensing superconducting magnet
US5744959A (en) * 1995-12-22 1998-04-28 Spectrospin Ag NMR measurement apparatus with pulse tube cooler
US20020002830A1 (en) * 2000-07-08 2002-01-10 Bruker Analytik Gmbh Circulating cryostat
US20040144101A1 (en) * 2001-08-01 2004-07-29 Albert Hofmann Device for the recondensation, by means of a cryogenerator, of low-boiling gases evaporating from a liquid gas container

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JP2821241B2 (ja) * 1990-06-08 1998-11-05 株式会社日立製作所 液化冷凍機付きクライオスタツト
GB2329700B (en) * 1997-09-30 2001-09-19 Oxford Magnet Tech Improvements in or relating to cryostat systems
US6376943B1 (en) * 1998-08-26 2002-04-23 American Superconductor Corporation Superconductor rotor cooling system
US6438966B1 (en) * 2001-06-13 2002-08-27 Applied Superconetics, Inc. Cryocooler interface sleeve
GB0125189D0 (en) * 2001-10-19 2001-12-12 Oxford Magnet Tech A pulse tube refrigerator
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US5129232A (en) * 1991-06-03 1992-07-14 General Electric Company Vibration isolation of superconducting magnets
US5317879A (en) * 1992-10-28 1994-06-07 General Electric Company Flexible thermal connection system between a cryogenic refrigerator and an mri superconducting magnet
US5331735A (en) * 1993-04-28 1994-07-26 General Electric Company Method of forming a flexible connector
US5461873A (en) * 1993-09-23 1995-10-31 Apd Cryogenics Inc. Means and apparatus for convectively cooling a superconducting magnet
US5563566A (en) * 1995-11-13 1996-10-08 General Electric Company Cryogen-cooled open MRI superconductive magnet
US5744959A (en) * 1995-12-22 1998-04-28 Spectrospin Ag NMR measurement apparatus with pulse tube cooler
US5613367A (en) * 1995-12-28 1997-03-25 General Electric Company Cryogen recondensing superconducting magnet
US20020002830A1 (en) * 2000-07-08 2002-01-10 Bruker Analytik Gmbh Circulating cryostat
US20040144101A1 (en) * 2001-08-01 2004-07-29 Albert Hofmann Device for the recondensation, by means of a cryogenerator, of low-boiling gases evaporating from a liquid gas container

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100162731A1 (en) * 2008-09-22 2010-07-01 Oxford Instruments Superconductivity Limited Cryogenic cooling apparatus and method using a sleeve with heat transfer member
US20130118184A1 (en) * 2009-06-18 2013-05-16 Carl Zeiss Nts, Llc Cooled charged particle systems and methods
US20150348689A1 (en) * 2013-01-06 2015-12-03 Institute Of Electrical Engineering, Chinese Academy Of Sciences Superconducting Magnet System for Head Imaging
US9666344B2 (en) * 2013-01-06 2017-05-30 Institute Of Electrical Engineering, Chinese Academy Of Sciences Superconducting magnet system for head imaging
US20160055949A1 (en) * 2013-03-27 2016-02-25 Japan Superconductor Technology Inc. Cryostat
US9982840B2 (en) 2014-09-30 2018-05-29 Bruker Biospin Gmbh Cooling device with cryostat and cold head having reduced mechanical coupling
US10352501B2 (en) 2015-07-01 2019-07-16 Bruker Biospin Gmbh Cryostat with active neck tube cooling by a second cryogen
US10101420B2 (en) 2016-09-20 2018-10-16 Bruker Biospin Gmbh Cryostat arrangement with a vacuum container and an object to be cooled, with evacuable cavity
WO2018054648A1 (fr) 2016-09-20 2018-03-29 Bruker Biospin Gmbh Dispositif et procédé permettant un fonctionnement surrefroidi d'un cryostat avec de faibles quantités de réfrigérant
DE102016218000B3 (de) * 2016-09-20 2017-10-05 Bruker Biospin Gmbh Kryostatenanordnung mit einem Vakuumbehälter und einem zu kühlenden Objekt, mit evakuierbarem Hohlraum
CN112236036A (zh) * 2018-05-20 2021-01-15 阿贝亚技术有限责任公司 低温存储单元
US11808504B2 (en) 2019-05-20 2023-11-07 Sumitomo Heavy Industries, Ltd. Cryogenic device and cryostat
CN112133514A (zh) * 2019-06-25 2020-12-25 布鲁克瑞士股份公司 具有弹簧弹性的、导热的连接元件的低温恒温器组件
US11810711B2 (en) 2019-06-25 2023-11-07 Bruker Switzerland Ag Cryostat assembly having a resilient, heat-conducting connection element
CN112402751A (zh) * 2020-09-04 2021-02-26 湖北贵族真空科技股份有限公司 热桥式液氧呼吸器
CN114637349A (zh) * 2022-03-04 2022-06-17 中国科学院电工研究所 一种液氦温区恒温装置及恒温控制方法
CN117048653A (zh) * 2023-10-12 2023-11-14 西南交通大学 一种用于超导磁悬浮列车的低温恒温装置及方法

Also Published As

Publication number Publication date
JP2006054444A (ja) 2006-02-23
DE102004034729B4 (de) 2006-12-07
DE102004034729A1 (de) 2006-02-16
EP1617157A2 (fr) 2006-01-18
EP1617157A3 (fr) 2012-05-30

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Owner name: BRUKER BIOSPIN AG, SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KRAUS, ANDREAS;MRAZ, BEAT;BOESEL, JOHANNES;REEL/FRAME:016753/0034

Effective date: 20050411

STCB Information on status: application discontinuation

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