US4587504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet assembly for use in NMR apparatus
Assignee: Oxford Instruments Superconductivity Ltd
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Filing: 1984-11-07
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Granted: 1986-05-06
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Expires: 2004-11-07
Abstract
Abstract A magnet assembly (1) particularly for use in NMR apparatus comprises a first superconducting coil assembly (A,A'-C,C') for generating a first magnetic field; and a second superconducting coil assembly (D-F) for generating a second magnetic field. The second superconducting coil assembly (D-F) is electrically connected in series with the first superconducting coil assembly (A,A'-C,C'). Each coil assembly (A,A'-C,C'; D-F) generates magnetic fields where corresponding components are of substantially the same order of magnitude whereby a resultant, uniform magnetic field is generated in a working volume (3). The second magnetic field opposes the first magnetic field externally of the magnet assembly (1).
Inventors
- 👤 Ian J. Brown
- 👤 John M. Bird
- 👤 Ian L. McDougall
- 👤 David Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:47
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/42; G01R33/421; G01R33/38; G01R33/381; G01R33/3815; G01R33/387; G01R33/3875; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/879
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
112 words
A magnet assembly comprising a first superconducting coil assembly defining a working volume and adapted to generate a first magnetic field in said working volume; and a second superconducting coil assembly adapted to generate a second magnetic field, said second superconducting coil assembly being electrically connected in series with said first superconducting coil assembly, wherein said first and second superconducting coil assemblies are each adapted to generate magnetic fields whose corresponding components are of substantially the same order of magnitude, said assemblies being arranged such that a resultant, uniform magnetic field is generated in said working volume, and said second magnetic field opposes said first magnetic field externally of said magnet assembly.
Claim 2
Dependent Claim
112 words
A magnet assembly comprising a first superconducting coil assembly defining a working volume and adapted to generate a first magnetic field in said working volume; and a second superconducting coil assembly adapted to generate a second magnetic field, said second superconducting coil assembly being electrically connected in series with said first superconducting coil assembly, wherein said first and second superconducting coil assemblies are each adapted to generate magnetic fields whose corresponding components are of substantially the same order of magnitude, said assemblies being arranged such that a resultant, uniform magnetic field is generated in said working volume, and said second magnetic field opposes said first magnetic field externally of said magnet assembly.
Claim 3
Dependent Claim
40 words
An assembly according to claim 1, wherein said assembly defines a mid-plane, said first superconducting coil assembly comprising a plurality of coaxial coils defining an axis and arranged symmetrically about said mid-plane of said magnet assembly normal to said axis.
Claim 4
Dependent Claim
40 words
An assembly according to claim 1, wherein said assembly defines a mid-plane, said second superconducting coil assembly comprising a plurality of coaxial coils defining an axis and arranged symmetrically about said mid-plane of said magnet assembly normal to said axis.
Claim 5
Dependent Claim
85 words
An assembly according to claim 1, wherein said assembly defines a mid-plane, said first superconducting coil assembly comprising a plurality of coaxial coils defining an axis and arranged symmetrically about said mid-plane of said magnet assembly normal to said axis and said second superconducting coil assembly comprising a plurality of coaxial coils defining an axis and arranged symmetrically about said mid-plane of said magnet assembly normal to said axis, wherein said axes of said coils of said first and second superconducting coil assemblies are coincident.
Claim 6
Dependent Claim
22 words
An assembly according to claim 1, further comprising a shield of magnetic material arranged around at least said first superconducting coil assembly.
Claim 7
Dependent Claim
13 words
An assembly according to claim 5, wherein said shield is made of iron.
Claim 8
Dependent Claim
22 words
An assembly according to claim 5, further comprising a former supporting said second superconducting assembly; said shield being constituted by said former.
Claim 9
Dependent Claim
13 words
An assembly according to claim 7, wherein said former is made of iron.
Claim 10
Dependent Claim
52 words
An assembly according to claim 1, wherein said working volume defines opposed ends, said assembly further comprising a pair of additional coils positioned adjacent to each of said ends of said working volume and arranged to oppose the resultant magnet field generated by said first and second coil assemblies at these positions.
Claim 11
Dependent Claim
137 words
NMR imaging apparatus incorporating a magnet assembly comprising a first superconducting coil assembly defining a working volume and adapted to generate a first magnetic field in said working volume; and a second superconducting coil assembly adapted to generate a second magnetic field, said second superconducting coil assembly being electrically connected in series with said first superconducting coil assembly, wherein said first and second superconducting coil assemblies are each adapted to generate magnetic fields whose corresponding components are of substantially the same order of magnitude, said assemblies being arranged such that a resultant, uniform magnetic field is generated in said working volume, and said second magnetic field opposes said first magnetic field externally of said magnet assembly; a power supply for activating said first and second superconducting coil assemblies; and control means for controlling operation of the apparatus.
Claim 12
Dependent Claim
137 words
NMR imaging apparatus incorporating a magnet assembly comprising a first superconducting coil assembly defining a working volume and adapted to generate a first magnetic field in said working volume; and a second superconducting coil assembly adapted to generate a second magnetic field, said second superconducting coil assembly being electrically connected in series with said first superconducting coil assembly, wherein said first and second superconducting coil assemblies are each adapted to generate magnetic fields whose corresponding components are of substantially the same order of magnitude, said assemblies being arranged such that a resultant, uniform magnetic field is generated in said working volume, and said second magnetic field opposes said first magnetic field externally of said magnet assembly; a power supply for activating said first and second superconducting coil assemblies; and control means for controlling operation of the apparatus.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |