WO1994005022B1 - Superconducting control elements for rf antennas - Google Patents
Superconducting control elements for rf antennasInfo
- Publication number
- WO1994005022B1 WO1994005022B1 PCT/US1993/007701 US9307701W WO9405022B1 WO 1994005022 B1 WO1994005022 B1 WO 1994005022B1 US 9307701 W US9307701 W US 9307701W WO 9405022 B1 WO9405022 B1 WO 9405022B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- superconducting
- tines
- capacitor
- high temperature
- substrate
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 claims abstract 16
- 239000000758 substrate Substances 0.000 claims 12
- 239000010979 ruby Substances 0.000 claims 6
- 229910001750 ruby Inorganic materials 0.000 claims 6
- 230000001808 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000002595 magnetic resonance imaging Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
Abstract
Control elements for RF antennas including high temperature superconducting capacitors (24) are formed. In one embodiment, a high temperature superconducting capacitor (24) is coupled to an inductor (22) to form a resonant circuit (20). In another embodiment a high temperature superconducting capacitor (32) is used to make a low-resistance cross-over (33) for an inductor (31). Additional circuits include circuits which do not use non-superconducting materials in the circuit, circuits which have coupled superconducting inductors (50, 51) for low-loss signal coupling, tuning and bandwidth broadening, and circuits which include switches to shut off the superconductivity of a superconductive element including low-loss photoconducting (70) and superconducting thermal (61) switches. These circuits are useful in Magnetic Resonance Imaging devices.
Claims
AMENDED CLAIMS
[received by the International Bureau on 2 February 1994 (02.02.94); original claims 3 and 4 cancelled; original claims 1 and 2 amended; new claims 25-31 added; remaining claims unchanged (2 pages)]
1. A high temperature superconducting capacitor comprising a first superconducting plate member and a second superconducting plate member, wherein the first superconducting plate member is hybridized to the second superconducting plate member and a dielectric is positioned between the first and second superconducting plate members.
2. A high temperature superconducting capacitor comprising a first superconducting plate member and a second superconducting plate member fabricated on a substrate and separated by a dielectric wherein the substrate comprises a dielectric and has a surface, the first superconducting plate member comprises a plurality of tines extending along the surface of the substrate, and the second superconducting plate member comprises a plurality of tines extending along the surface of the substrate and interspersed between the tines of the first plate member with substrate separating the tines of the first plate member and the tines of the second plate member.
5. A superconducting resonant circuit comprising an inductor and a high temperature superconducting capacitor.
6. A superconducting resonant circuit of claim 5 wherein the superconducting capacitor comprises
25. A high temperature superconducting capacitor comprising first and second superconducting plate members, and a dielectric having a first surface to which the first plate member is hybridized and having a second surface to which the second plate member is hybridized wherein the dielectric separates the first and second plate members.
26. A high temperature superconducting capacitor comprising a first superconducting member fabricated on a substrate, said first superconducting member having a plurality of tines extending along a surface of the substrate, a second superconducting member fabricated on the substrate, said second superconducting member having a plurality of tines extending along the surface of the substrate and interspersed between the tines of the first superconducting member with substrate separating the tines of the first superconducting member and the tines of the second superconducting member.
27. The high temperature superconducting capacitor of claim 26 wherein the substrate comprises a dielectric.
28. The high temperature superconducting capacitor of claim 26 wherein the surface of the substrate is planer.
29. The high temperature superconducting capacitor of claim 26 wherein the tines of the first and second superconducting members includes one or more tines having a length and a width wherein the length is at least about 250 times the width.
30. The high temperature superconducting capacitor of claim 29 wherein the length is at least about 800 times the width. 31. The high temperature superconducting capacitor of claim 29 wherein the length is at least about 1600 times the width.
STATEMENTUNDERARTICLE 19
Claim 1 is amended, Claims 3 and 4 are cancelled, and Claims 25-31 have been added, to designate over the patents cited by the Examiner. Applicant hereby brings to the attention of the Examiner the enclosed U.S. Patent No. 5,231,078 to Riebman, e_t al. Although this patent may be pertinent to the art of the present invention, it does not disclose the invention as presently claimed.
The Examiner cites several patents as disclosing the superconductive capacitor plate structure of the present invention. However, neither Riebman nor any of the patents cited by the Examiner include superconducting plates, at least one of which is hybridized, as required in Claims 1 and 25.
In addition, none of the patents cited by the Examiner includes interspersed structures having superconducting tines which lie along the same surface as do the superconducting members, as required in Claims 2 and 26-31. Ruby, U.S. Pat. No. 5,061,686, is the only citation which was cited as a superconductive device having an interdigitated structure. However, Ruby does not show a structure as is presently claimed.
The Ruby device as shown in figures 4 and 5, has a trace structure 36 and 38 which includes interdigitated fingers 40 and 42, and has a capacitor member 26 which includes superconductive plates 54 and 56 separated by dielectric 52. However, as is shown in figure 5, the interdigitated fingers 40 and 42 are merely structural features to allow multiple connections to each plate 54 and 56 by means of vias 48 and 50. In addition, the interdigitated fingers 40 and 42 are separated from the plates 54 and 56 by a support member 24.
The invention of the present application is a significant improvement over the device of Ruby 5,061,686. Ruby does not disclose an interspersed structure which includes superconducting tines which lie along the same surface as do the superconducting members. In addition, neither Ruby nor any of the patents cited by the Examiner show a pair of interspersed tines having lengths at least about 250 times their widths as is required by Claims 29-31.
The invention of the present application is not suggested or shown in the patents cited by the Examiner or the patent cited by the applicant.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/934,921 | 1992-08-25 | ||
US07/934,921 US6335622B1 (en) | 1992-08-25 | 1992-08-25 | Superconducting control elements for RF antennas |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1994005022A1 WO1994005022A1 (en) | 1994-03-03 |
WO1994005022B1 true WO1994005022B1 (en) | 1994-03-31 |
Family
ID=25466274
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1993/007701 WO1994005022A1 (en) | 1992-08-25 | 1993-08-16 | Superconducting control elements for rf antennas |
Country Status (2)
Country | Link |
---|---|
US (5) | US6335622B1 (en) |
WO (1) | WO1994005022A1 (en) |
Families Citing this family (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6335622B1 (en) * | 1992-08-25 | 2002-01-01 | Superconductor Technologies, Inc. | Superconducting control elements for RF antennas |
US5565778A (en) * | 1992-06-01 | 1996-10-15 | Conductus, Inc. | Nuclear magnetic resonance probe coil |
US5585723A (en) * | 1995-03-23 | 1996-12-17 | Conductus, Inc. | Inductively coupled superconducting coil assembly |
US5594342A (en) * | 1992-06-01 | 1997-01-14 | Conductus, Inc. | Nuclear magnetic resonance probe coil with enhanced current-carrying capability |
JP2871516B2 (en) * | 1995-03-22 | 1999-03-17 | 株式会社移動体通信先端技術研究所 | Oxide superconducting thin film device |
WO1998025163A1 (en) * | 1996-12-02 | 1998-06-11 | The Trustees Of Columbia University In The City Of New York | Multiple resonance superconducting probe |
US6586309B1 (en) * | 2000-04-24 | 2003-07-01 | Chartered Semiconductor Manufacturing Ltd. | High performance RF inductors and transformers using bonding technique |
US6377047B1 (en) * | 2000-06-08 | 2002-04-23 | Varian, Inc. | Superconducting birdcage coils |
EP1311006A4 (en) * | 2000-07-24 | 2007-07-25 | Matsushita Electric Ind Co Ltd | Thin-film piezoelectric element |
JP4122833B2 (en) * | 2002-05-07 | 2008-07-23 | 株式会社日立製作所 | Probe for NMR apparatus using magnesium diboride |
US7521932B2 (en) * | 2003-05-06 | 2009-04-21 | The Penn State Research Foundation | Method and system for adjusting the fundamental symmetric mode of coupled high temperature superconductor coils |
US20040231137A1 (en) * | 2003-05-20 | 2004-11-25 | Derek Seeber | Method of manufacturing local coils using pre-tuned non-magnetic circuitry modules |
US20050104593A1 (en) * | 2003-08-21 | 2005-05-19 | Laubacher Daniel B. | Nuclear quadrupole resonance detection system using a high temperature superconductor self-resonant coil |
US7295085B2 (en) * | 2003-08-21 | 2007-11-13 | E.I. Du Pont De Nemours And Company | Process for making high temperature superconductor devices each having a line oriented in a spiral fashion |
US7148684B2 (en) | 2003-10-23 | 2006-12-12 | E.I. Du Pont De Nemours And Company | Method for biological identification using high temperature superconductor enhanced nuclear quadrupole resonance |
US7106058B2 (en) | 2003-11-12 | 2006-09-12 | E.I. Dupont De Nemours And Company | Detection of contraband using nuclear quadrupole resonance |
US7301344B2 (en) | 2003-11-24 | 2007-11-27 | E.I. Du Pont De Nemours & Co. | Q-damping circuit including a high temperature superconductor coil for damping a high temperature superconductor self-resonant coil in a nuclear quadrupole resonance detection system |
US20070245374A1 (en) | 2003-11-24 | 2007-10-18 | Inventec Corporation | Video program subtitle tex recording method and system |
US7332910B2 (en) * | 2003-11-24 | 2008-02-19 | E.I. Du Pont De Nemours And Company | Frequency detection system comprising circuitry for adjusting the resonance frequency of a high temperature superconductor self-resonant coil |
WO2005059582A1 (en) * | 2003-12-15 | 2005-06-30 | E.I. Dupont De Nemours And Company | The use of multiple sensors in a nuclear quadrupole resonance detection system to improve measurement speed |
WO2005078469A1 (en) | 2004-02-04 | 2005-08-25 | E.I. Dupont De Nemours And Company | The use of two or more sensors to detect different nuclear quadrupole resonance signals of a target compound |
WO2005109023A2 (en) | 2004-02-04 | 2005-11-17 | E.I. Dupont De Nemours And Company | Nqr rf coil assembly comprising two or more coils which may be made from hts |
US7248046B2 (en) * | 2004-04-15 | 2007-07-24 | E. I. Du Pont De Nemours And Company | Decoupling high temperature superconductor sensor arrays in nuclear quadrupole resonance detection systems |
US7265549B2 (en) * | 2004-04-30 | 2007-09-04 | E. I. Du Pont De Nemours And Company | Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to the same frequency |
EP1740967A2 (en) * | 2004-04-30 | 2007-01-10 | E.I.Du pont de nemours and company | Methods and apparatus for scanning a band of frequencies using an array of high temperature superconductor sensors |
US7279897B2 (en) | 2004-04-30 | 2007-10-09 | E. I. Du Pont De Nemours And Company | Scanning a band of frequencies using an array of high temperature superconductor sensors tuned to different frequencies |
WO2006030332A2 (en) | 2004-09-16 | 2006-03-23 | Koninklijke Philips Electronics N.V. | Magnetic resonance receive coils with compact inductive components |
US8035382B2 (en) * | 2004-11-23 | 2011-10-11 | m2m Imaging Corporation | Coil decoupling in magnetic resonance imaging |
JP4647984B2 (en) * | 2004-12-02 | 2011-03-09 | 株式会社日立製作所 | Nuclear magnetic resonance probe coil |
EP1828797A1 (en) * | 2004-12-03 | 2007-09-05 | E.I. Dupont De Nemours And Company | Decoupling of excitation and receive coils of an nqr detection system during signal reception |
WO2006065929A1 (en) * | 2004-12-13 | 2006-06-22 | E. I. Du Pont De Nemours And Company | Metal shield alarm in a nuclear quadrupole resonance/x-ray contraband detection system |
US20090027280A1 (en) * | 2005-05-05 | 2009-01-29 | Frangioni John V | Micro-scale resonant devices and methods of use |
US20070007844A1 (en) * | 2005-07-08 | 2007-01-11 | Levitronics, Inc. | Self-sustaining electric-power generator utilizing electrons of low inertial mass to magnify inductive energy |
DE102006009043B4 (en) * | 2006-02-27 | 2008-10-30 | Siemens Ag | Radio-frequency antenna arrangement for detecting a magnetic resonance signal and magnetic resonance system with such a radio-frequency antenna arrangement |
US20070262776A1 (en) * | 2006-05-10 | 2007-11-15 | Petropoulos Labros S | Magnetic Resonance Imaging Magnet Assembly System with Improved Homogeneity |
JP2007322361A (en) * | 2006-06-05 | 2007-12-13 | Hitachi Ltd | Nuclear magnetic resonance device and probe for same |
DE102006042996A1 (en) * | 2006-09-13 | 2007-10-04 | Siemens Ag | Antenna for magnetic resonance application, has conductor loop oscillating high frequency current in current flow direction during operation of antenna and divided into loop sections in current flow direction |
EP1918730B1 (en) * | 2006-10-26 | 2013-05-15 | Bruker BioSpin AG | NMR apparatus with a microfluidic NMR chip |
DE102006053472B4 (en) * | 2006-11-14 | 2009-12-10 | Bruker Biospin Ag | Method for producing a tuned RF resonator system |
US20090322332A1 (en) * | 2007-03-28 | 2009-12-31 | Varian, Inc. | NMR probe superconductive transmit/receive switches |
US8299572B2 (en) * | 2007-06-20 | 2012-10-30 | Skyworks Solutions, Inc | Semiconductor die with backside passive device integration |
US7791339B2 (en) * | 2007-09-07 | 2010-09-07 | Varian, Inc. | RF-switched superconducting resonators and methods of switching thereof |
US8238989B2 (en) * | 2008-08-28 | 2012-08-07 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | RF component with a superconducting area having higher current density than a non-superconducting area |
US8970217B1 (en) | 2010-04-14 | 2015-03-03 | Hypres, Inc. | System and method for noise reduction in magnetic resonance imaging |
WO2014135749A1 (en) * | 2013-03-05 | 2014-09-12 | Teknologian Tutkimuskeskus Vtt | Superconducting thermal detector (bolometer) of terahertz (sub-millimeter wave) radiation |
WO2015050528A1 (en) * | 2013-10-01 | 2015-04-09 | Intel Corporation | Mechanism for generating a hybrid communication circuitry for facilitating hybrid communication between devices |
US9305194B2 (en) | 2014-03-27 | 2016-04-05 | Intel Corporation | One-touch input interface |
US10333200B2 (en) | 2015-02-17 | 2019-06-25 | Samsung Electronics Co., Ltd. | Portable device and near field communication chip |
KR20170086328A (en) * | 2016-01-18 | 2017-07-26 | 삼성전자주식회사 | Local coil apparatus, magnetic resonance imaging apparatus, and control method of the local coil apparatus |
US11109451B2 (en) | 2016-07-20 | 2021-08-31 | Kymeta Corporation | Internal heater for RF apertures |
US11070123B2 (en) * | 2017-07-07 | 2021-07-20 | The Boeing Compan | Energy storage and energy storage device |
US11715871B2 (en) * | 2019-12-17 | 2023-08-01 | Kymeta Corporation | Iris heater structure for uniform heating |
Family Cites Families (59)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3764938A (en) * | 1972-08-28 | 1973-10-09 | Bell Telephone Labor Inc | Resonance suppression in interdigital capacitors useful as dc bias breaks in diode oscillator circuits |
FR2220929B1 (en) | 1973-02-20 | 1976-06-11 | Minet Roger | |
US4409608A (en) * | 1981-04-28 | 1983-10-11 | The United States Of America As Represented By The Secretary Of The Navy | Recessed interdigitated integrated capacitor |
US4692705A (en) * | 1983-12-23 | 1987-09-08 | General Electric Company | Radio frequency field coil for NMR |
US4765055A (en) * | 1985-08-26 | 1988-08-23 | The Furukawa Electric Co., Ltd. | Method of fabricating a superconducting cavity |
JPH0618197B2 (en) * | 1987-07-30 | 1994-03-09 | 日本電気株式会社 | Superconducting monolithic microwave integrated circuit |
US4827536A (en) * | 1987-11-12 | 1989-05-09 | Sung Henry H | Necktie with holding means |
US4918049A (en) * | 1987-11-18 | 1990-04-17 | Massachusetts Institute Of Technology | Microwave/far infrared cavities and waveguides using high temperature superconductors |
US4881034A (en) * | 1988-01-19 | 1989-11-14 | The Regents Of The University Of California | Switchable MRI RF coil array with individual coils having different and overlapping fields of view |
US4869598A (en) * | 1988-03-11 | 1989-09-26 | Mcdonald Donald G | Temperature-sensitive multiple-layer thin film superconducting device |
US4981838A (en) * | 1988-03-17 | 1991-01-01 | The University Of British Columbia | Superconducting alternating winding capacitor electromagnetic resonator |
US4918050A (en) * | 1988-04-04 | 1990-04-17 | Motorola, Inc. | Reduced size superconducting resonator including high temperature superconductor |
US4872086A (en) * | 1988-10-20 | 1989-10-03 | Motorola, Inc. | Dielectric RF devices suited for use with superconductors |
US5036042A (en) * | 1988-12-29 | 1991-07-30 | International Superconductor Corp. | Switchable superconducting mirrors |
US5075281A (en) * | 1989-01-03 | 1991-12-24 | Testardi Louis R | Methods of making a high dielectric constant, resistive phase of YBA2 CU3 OX and methods of using the same |
US5061686A (en) * | 1989-05-15 | 1991-10-29 | Hewlett-Packard Company | Superconducting power distribution structure for integrated circuits |
US5097128A (en) * | 1989-07-31 | 1992-03-17 | Santa Barbara Research Center | Superconducting multilayer architecture for radiative transient discrimination |
JPH03286601A (en) * | 1990-04-03 | 1991-12-17 | Res Dev Corp Of Japan | Microwave resonator |
US5260398A (en) * | 1990-04-05 | 1993-11-09 | The Dow Chemical Company | Aromatic cyanate-siloxane |
FR2662856B1 (en) * | 1990-06-01 | 1997-01-24 | Thomson Csf | TUNABLE HIGH FREQUENCY DEVICES. |
US5168230A (en) * | 1990-08-17 | 1992-12-01 | General Electric | Dual frequency nmr surface coil pair with interleaved lobe areas |
US5215959A (en) * | 1990-09-21 | 1993-06-01 | University Of California, Berkeley | Devices comprised of discrete high-temperature superconductor chips disposed on a surface |
US5231327A (en) * | 1990-12-14 | 1993-07-27 | Tfr Technologies, Inc. | Optimized piezoelectric resonator-based networks |
ES2120951T3 (en) * | 1991-03-26 | 1998-11-16 | Mars Inc | DEVICE FOR THE DETECTION OF THE PRESENCE AND / OR FOR THE DETERMINATION OF THE APPEARANCE OF A MAGNETIC SUBSTANCE, EVEN IN SMALL AMOUNTS. |
US6335622B1 (en) * | 1992-08-25 | 2002-01-01 | Superconductor Technologies, Inc. | Superconducting control elements for RF antennas |
US5328893A (en) | 1991-06-24 | 1994-07-12 | Superconductor Technologies, Inc. | Superconducting devices having a variable conductivity device for introducing energy loss |
CA2073272C (en) | 1991-07-08 | 1997-04-01 | Kenjiro Higaki | Microwave resonator of compound oxide superconductor material |
US5231078A (en) * | 1991-09-05 | 1993-07-27 | Ael Defense Corp. | Thin film superconducting LC network |
US5276398A (en) | 1992-06-01 | 1994-01-04 | Conductus, Inc. | Superconducting magnetic resonance probe coil |
US5594342A (en) * | 1992-06-01 | 1997-01-14 | Conductus, Inc. | Nuclear magnetic resonance probe coil with enhanced current-carrying capability |
US5585723A (en) * | 1995-03-23 | 1996-12-17 | Conductus, Inc. | Inductively coupled superconducting coil assembly |
US5565778A (en) * | 1992-06-01 | 1996-10-15 | Conductus, Inc. | Nuclear magnetic resonance probe coil |
US5472935A (en) * | 1992-12-01 | 1995-12-05 | Yandrofski; Robert M. | Tuneable microwave devices incorporating high temperature superconducting and ferroelectric films |
US5682128A (en) * | 1996-04-23 | 1997-10-28 | Illinois Superconductor Corporation | Superconducting reentrant resonator |
US5888942A (en) * | 1996-06-17 | 1999-03-30 | Superconductor Technologies, Inc. | Tunable microwave hairpin-comb superconductive filters for narrow-band applications |
US7047059B2 (en) * | 1998-08-18 | 2006-05-16 | Quantum Magnetics, Inc | Simplified water-bag technique for magnetic susceptibility measurements on the human body and other specimens |
WO1998025163A1 (en) * | 1996-12-02 | 1998-06-11 | The Trustees Of Columbia University In The City Of New York | Multiple resonance superconducting probe |
US6198284B1 (en) * | 1997-04-14 | 2001-03-06 | Doty Scientific Inc. | High power flexible leads for DAS NMR |
US5949311A (en) * | 1997-06-06 | 1999-09-07 | Massachusetts Institute Of Technology | Tunable resonators |
US5882128A (en) * | 1997-09-02 | 1999-03-16 | Hewlett-Packard Company | Self-adjusting wheel for directly positioning and holding media during a cutting operation in a printer |
US6025719A (en) * | 1997-11-07 | 2000-02-15 | Varian, Inc. | Nuclear magnetic resonance method and apparatus |
US6347237B1 (en) * | 1999-03-16 | 2002-02-12 | Superconductor Technologies, Inc. | High temperature superconductor tunable filter |
EP1230559A2 (en) * | 1999-05-21 | 2002-08-14 | The General Hospital Corporation | Rf coil for imaging system |
US6377047B1 (en) * | 2000-06-08 | 2002-04-23 | Varian, Inc. | Superconducting birdcage coils |
EP1344076A1 (en) * | 2000-10-09 | 2003-09-17 | Regents Of The University Of Minnesota | Method and apparatus for magnetic resonance imaging and spectroscopy using microstrip transmission line coils |
DE10056807A1 (en) * | 2000-11-16 | 2002-05-23 | Philips Corp Intellectual Pty | HF planar resonator for transmitting/receiving circularly polarized electromagnetic waves has conductor structures stretching from a central area in radial directions and a conductor loop around this area for a return current. |
US6420871B1 (en) * | 2001-03-02 | 2002-07-16 | Varian, Inc. | Multiple tuned birdcage coils |
US6556013B2 (en) * | 2001-03-09 | 2003-04-29 | Bruker Biospin Corp. | Planar NMR coils with localized field-generating and capacitive elements |
US6771070B2 (en) * | 2001-03-30 | 2004-08-03 | Johns Hopkins University | Apparatus for magnetic resonance imaging having a planar strip array antenna including systems and methods related thereto |
DE10150131C2 (en) * | 2001-10-11 | 2003-10-09 | Bruker Biospin Ag Faellanden | RF receiver coil arrangement for an NMR resonator with macroscopically homogeneous distribution of the conductor structures |
DE10157972B4 (en) * | 2001-11-27 | 2004-01-08 | Bruker Biospin Ag | NMR spectrometer and operating method with stabilization of the transverse magnetization in superconducting NMR resonators |
US7088104B2 (en) * | 2001-12-31 | 2006-08-08 | The John Hopkins University | MRI tunable antenna and system |
US6700459B2 (en) * | 2002-05-29 | 2004-03-02 | Superconductor Technologies, Inc. | Dual-mode bandpass filter with direct capacitive couplings and far-field suppression structures |
US6894584B2 (en) * | 2002-08-12 | 2005-05-17 | Isco International, Inc. | Thin film resonators |
US7560927B2 (en) * | 2003-08-28 | 2009-07-14 | Massachusetts Institute Of Technology | Slitted and stubbed microstrips for high sensitivity, near-field electromagnetic detection of small samples and fields |
KR101192907B1 (en) * | 2004-07-23 | 2012-10-18 | 더 리젠트스 오브 더 유니이버시티 오브 캘리포니아 | Metamaterials |
US7514926B2 (en) * | 2005-11-14 | 2009-04-07 | Regents Of The University Of Minnesota | Spatially reconfigurable magnetic resonance coil |
US7420371B2 (en) * | 2006-01-04 | 2008-09-02 | Enh Research Institute | Slab-selective RF coil for MR system |
US7446534B2 (en) * | 2006-12-20 | 2008-11-04 | Varian, Inc. | Cold normal metal and HTS NMR probe coils with electric field shields |
-
1992
- 1992-08-25 US US07/934,921 patent/US6335622B1/en not_active Expired - Lifetime
-
1993
- 1993-08-16 WO PCT/US1993/007701 patent/WO1994005022A1/en active Application Filing
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2001
- 2001-10-03 US US09/970,842 patent/US6538445B2/en not_active Expired - Fee Related
-
2003
- 2003-03-19 US US10/393,089 patent/US6727702B2/en not_active Expired - Fee Related
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2004
- 2004-04-12 US US10/823,273 patent/US7190165B2/en not_active Expired - Fee Related
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2007
- 2007-03-12 US US11/717,596 patent/US8030925B2/en not_active Expired - Fee Related
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