Patent US4483349A successfully refreshed from Google Patents.
US5570073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
NMR slice coil
Assignee: Bruker Biospin GmbH
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Filing: 1995-04-13
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Granted: 1996-10-29
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Expires: 2015-04-13
Abstract
Abstract A magnet system for a nuclear spin tomograph having at least one field producing magnet coil S 1 with radius r s1 arranged in a middle plane which produces a homogeneous magnetic field in an investigational volume directed along a z-axis perpendicular to the middle plane, is characterized in that at least one, preferentially at least two, ferromagnetic rings R i with radius r Ri are provided in the middle plane concentric to the magnetic coil S 1 . A system of this kind can be substantially more compact in construction than conventional systems with equal produced field strength. In addition substantially reduced currents are required through the coil or coils for field production.
Inventors
- 👤 Wolfgang Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:06
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/383; G01R33/3806; G01R33/387; G01R33/3875; G01R33/42; G01R33/421
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils; and a second ferromagnetic ring, generally concentric and coplanar with the first and second magnet coils and the first ferromagnetic ring.
Claim 2
Dependent Claim
124 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils; and a second ferromagnetic ring, generally concentric and coplanar with the first and second magnet coils and the first ferromagnetic ring.
Claim 3
Dependent Claim
172 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils; a second ferromagnetic ring, generally concentric and coplanar with the first and second magnet coils and the first ferromagnetic ring, wherein the first coil has a radius larger than a radius of the first ring, the second ring has a radius larger than the first coil radius and the second coil has a radius larger than the second ring radius; and a ferromagnetic yoke surrounding the first magnet coil.
Claim 4
Dependent Claim
172 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils; a second ferromagnetic ring, generally concentric and coplanar with the first and second magnet coils and the first ferromagnetic ring, wherein the first coil has a radius larger than a radius of the first ring, the second ring has a radius larger than the first coil radius and the second coil has a radius larger than the second ring radius; and a ferromagnetic yoke surrounding the first magnet coil.
Claim 5
Dependent Claim
114 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; and a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils, wherein the first magnet coil is a resistive magnet coil.
Claim 6
Dependent Claim
114 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; and a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils, wherein the first magnet coil is a resistive magnet coil.
Claim 7
Dependent Claim
117 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; and a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils, wherein the first ferromagnetic ring is partially integrated into the first magnet coil.
Claim 8
Dependent Claim
117 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; and a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils, wherein the first ferromagnetic ring is partially integrated into the first magnet coil.
Claim 9
Dependent Claim
112 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; and a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils, wherein the first ferromagnetic ring is permanent magnet.
Claim 10
Dependent Claim
112 words
A magnet system for producing, in an investigational volume, a homogeneous magnetic field directed along a z-axis, the system comprising: a first field producing magnet coil located in a middle plane perpendicular to the z-axis, the middle plane passing through the investigational volume; a second field producing magnet coil, generally concentric and coplanar with the first magnet coil and electrically connected therewith to have a first current flow in the first magnet coil directed in a same direction as a second current flow through the second magnet coil; and a first ferromagnetic ring generally concentric and coplanar with the first and second magnet coils, wherein the first ferromagnetic ring is permanent magnet.
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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) | 1999-10-29 | 2000-04-29 | 2000-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-29 | 2004-04-29 | 2004-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-29 | 2008-04-29 | 2008-10-29 | $7700.00 | Window Closed / Lapsed |