US4213092A
Expired / Lapsed
US
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NMR Spectrometer with superconducting coil having rectangular cross-section wire
Assignee: Varian Medical Systems Inc
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Filing: 1978-02-21
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Granted: 1980-07-15
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Expires: 1998-02-21
Abstract
Abstract An NMR spectrometer includes a superconducting, solenoid coil formed of superconducting wire having a rectangular cross-section. The wire is formed of a non superconducting metal surrounding superconducting material having a small enough cross sectional area that a magnetic field resulting from current flowing in the superconductor material has a relatively constant position relative to the cross section of the wire. In one embodiment, the wire has a monofilament configuration including a core of the superconducting material surrounded by a sheath of the metal. In a second embodiment, the wire includes a copper block of the metal through which a multiplicity of superconductive strands extend.
Inventors
- 👤 George D. Kneip, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:34
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/381; G01R33/3815; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/842; Y10S505/843; Y10S505/844
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
186 words
An NMR spectrometer for testing a sample comprising a transmitting coil for applying an rf field to the sample, a receiver coil coupled to the sample for deriving a signal indicative of the NMR properties of the sample, a solenoid coil having a longitudinal axis about which the coil is wound and a central core in which said transmitting and receiver coils and said sample are positioned, said coil applying a homogeneous DC magnetic field to the sample, said coil being formed of superconducting wire having a rectangular cross-section, said wire being formed of a non-superconducting metal having a relatively low room temperature material surrounding superconductor material having a small enough cross sectional area that a magnetic field resulting from current flowing in the superconductor material has a relatively constant location relative to the cross section of the wire, said wire being wound as a plurality of helices each of which is concentric with the coil longitudinal axis, immediately adjacent helices having oppositely directed pitches and faces that abut substantially against each other, adjacent turns of the same helix having faces that abut against each other.
Claim 2
Dependent Claim
186 words
An NMR spectrometer for testing a sample comprising a transmitting coil for applying an rf field to the sample, a receiver coil coupled to the sample for deriving a signal indicative of the NMR properties of the sample, a solenoid coil having a longitudinal axis about which the coil is wound and a central core in which said transmitting and receiver coils and said sample are positioned, said coil applying a homogeneous DC magnetic field to the sample, said coil being formed of superconducting wire having a rectangular cross-section, said wire being formed of a non-superconducting metal having a relatively low room temperature material surrounding superconductor material having a small enough cross sectional area that a magnetic field resulting from current flowing in the superconductor material has a relatively constant location relative to the cross section of the wire, said wire being wound as a plurality of helices each of which is concentric with the coil longitudinal axis, immediately adjacent helices having oppositely directed pitches and faces that abut substantially against each other, adjacent turns of the same helix having faces that abut against each other.
Claim 3
Dependent Claim
19 words
The spectrometer of claim 1 wherein the superconductor material has a maximum cross section dimension of approximately 0.016 inches.
Claim 4
Dependent Claim
33 words
The spectrometer of claim 1 wherein adjacent faces of the wire differ in length so that the longer and shorter faces respectively extend transversely and parallel to the longitudinal axis of the coil.
Claim 5
Dependent Claim
27 words
The spectrometer of claim 3 wherein the wire has a monofilament configuration including a core of the superconducting material surrounded by a sheath of the non-superconducting metal.
Claim 6
Dependent Claim
19 words
The spectrometer of claim 4 wherein the longer and shorter faces respectively have dimensions of approximately 0.016" and 0.013".
Claim 7
Dependent Claim
15 words
The spectrometer of claim 5 wherein the core has a diameter of approximately 0.01 inches.
Claim 8
Dependent Claim
33 words
The spectrometer of claim 3 wherein the wire includes a block of the non-superconducting metal having relatively high room temperature conductivity, a multiplicity of strands of the superconductor material extending through the block.
Claim 9
Dependent Claim
33 words
The spectrometer of claim 7 wherein the longer and shorter faces respectively have dimensions of approximately 1 mil and 0.36 mils, each of said strands having a cross-sectional thickness of approximately 5 microns.
Claim 10
Dependent Claim
21 words
The spectrometer of claim 1 further including a layer of dielectric material between adjacent faces of adjacent ones of said helices.
Claim 11
Dependent Claim
27 words
The spectrometer of claim 1 wherein the wire has a monofilament configuration including a core of the superconducting material surrounded by a sheath of the non-superconducting metal.
Claim 12
Dependent Claim
34 words
The spectrometer of claim 1 wherein the wire includes a block of the non-superconducting metal having a relatively high room temperature conductivity, a multiplicity of strands of the superconductor material extending through the block.
Claim 13
Dependent Claim
100 words
In combination with an NMR spectrometer for testing a sample, a solenoid coil having a longitudinal axis, said coil applying a homogeneous DC magnetic field to the sample, said coil being formed of superconducting wire having a rectangular cross-section, said wire being formed of a non-superconducting metal having a relatively low room temperature material surrounding superconductor material having a small enough cross sectional area that a magnetic field resulting from current flowing in the superconductor material has a relatively constant position relative to the cross section of the wire, and means for maintaining said coil at cryogenic, liquid helium temperatures.
Claim 14
Dependent Claim
100 words
In combination with an NMR spectrometer for testing a sample, a solenoid coil having a longitudinal axis, said coil applying a homogeneous DC magnetic field to the sample, said coil being formed of superconducting wire having a rectangular cross-section, said wire being formed of a non-superconducting metal having a relatively low room temperature material surrounding superconductor material having a small enough cross sectional area that a magnetic field resulting from current flowing in the superconductor material has a relatively constant position relative to the cross section of the wire, and means for maintaining said coil at cryogenic, liquid helium temperatures.
Claim 15
Dependent Claim
33 words
The combination of claim 12 wherein adjacent faces of the wire differ in length so that the longer and shorter faces respectively extend transversely and parallel to the longitudinal axis of the coil.
Claim 16
Dependent Claim
27 words
The combination of claim 13 wherein the wire has a monofilament configuration including a core of the superconducting material surrounded by a sheath of the non-superconducting metal.
Claim 17
Dependent Claim
28 words
The combination of claim 13 wherein the wire includes a block of the non-superconducting metal, and a multiplicity of strands of the superconductor material extending through the block.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |