US4584549A
Expired / Lapsed
US
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Magnet system
Assignee: Oxford Instruments Superconductivity Ltd
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Filing: 1984-11-16
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Granted: 1986-04-22
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Expires: 2004-11-16
Abstract
Abstract A magnet system comprises magnetic field generating means such as a superconducting magnet (12) and a shield including a number of sheets (9) of magnetic material, the size (l z , l x ) and position (r) of the or each sheet (9) relatively to the magnetic field generating means (12) being such that in use at the edge of the sheet or sheets the component of magnetization (M z ) parallel to the sheet in the direction of the magnetic field is less than or substantially equal to zero.
Inventors
- 👤 Ian J. Brown
- 👤 John M. Bird
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
H; H05; H05K; H05K9/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A magnet system comprising magnetic field generating means; and a shield including at least one sheet of magnetic material positioned relatively to said magnetic field generating means whereby said magnetic field generating means generates a magnetic field which interacts with said at least one sheet, the dimensions defined by said at least one sheet and the position of said at least one sheet relatively to said magnetic field generating means being preselected such that at the edge of said at least one sheet the component of magnetisation parallel to said sheet in the direction of the magnetic field is less than zero.
Claim 2
Dependent Claim
102 words
A magnet system comprising magnetic field generating means; and a shield including at least one sheet of magnetic material positioned relatively to said magnetic field generating means whereby said magnetic field generating means generates a magnetic field which interacts with said at least one sheet, the dimensions defined by said at least one sheet and the position of said at least one sheet relatively to said magnetic field generating means being preselected such that at the edge of said at least one sheet the component of magnetisation parallel to said sheet in the direction of the magnetic field is less than zero.
Claim 3
Dependent Claim
13 words
A system according to claim 1, wherein said shield is made of iron.
Claim 4
Dependent Claim
14 words
A system according to claim 1, wherein the or each said sheet is rectangular.
Claim 5
Dependent Claim
40 words
A system according to claim 1, wherein said shield comprises a plurality of said sheets of magnetic material positioned around said magnetic field generating means parallel to the axis of said magnetic field generated by said magnetic field generating means.
Claim 6
Dependent Claim
103 words
A magnet system comprising magnetic field generating means; and a shield including at least one sheet of magnetic material positioned relatively to said magnetic field generating means whereby said magnetic field generating means generates a magnetic field which interacts with said at least one sheet, the dimensions defined by said at least one sheet and the position of said at least one sheet relatively to said magnetic field generating means being preselected such that at the edge of said at least one sheet the component of magnetisation parallel to said sheet in the direction of the magnetic field is substantially equal to zero.
Claim 7
Dependent Claim
103 words
A magnet system comprising magnetic field generating means; and a shield including at least one sheet of magnetic material positioned relatively to said magnetic field generating means whereby said magnetic field generating means generates a magnetic field which interacts with said at least one sheet, the dimensions defined by said at least one sheet and the position of said at least one sheet relatively to said magnetic field generating means being preselected such that at the edge of said at least one sheet the component of magnetisation parallel to said sheet in the direction of the magnetic field is substantially equal to zero.
Claim 8
Dependent Claim
13 words
A system according to claim 5, wherein said shield is made of iron.
Claim 9
Dependent Claim
14 words
A system according to claim 5, wherein the or each said sheet is rectangular.
Claim 10
Dependent Claim
40 words
A system according to claim 5, wherein said shield comprises a plurality of said sheets of magnetic material positioned around said magnetic field generating means parallel to the axis of said magnetic field generated by said magnetic field generating means.
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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |