Patent US4748429A successfully refreshed from Google Patents.
US4748429A
Expired / Lapsed
US
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Solenoidal magnet with homogeneous magnetic field
Assignee: General Electric CGR SA
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Filing: 1985-11-29
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Granted: 1988-05-31
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Expires: 2005-11-29
Abstract
Abstract A resistive solenoid magnet with homogeneous field is provided more particularly for NMR image formation. According to the invention, the magnet comprises several coils preferably Bitter coils and some parameters such as the lengths of the coils, the distances which separate them and their outer diameter are chosen for optimizing the power-mass product of the magnet.
Inventors
- 👤 Guy Aubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:54
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/202; G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/381; G01R33/3804
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
104 words
A solenoidal magnet, particularly for NMR applications, of the type including an assembly of Bitter type coils disposed along a common longitudinal axis and symmetrically with respect to a median transverse plane of a zone of interest where the magnetic field reigns, wherein all the coils have substantially the same inner and outer diameter and are connected so as to have the same current flowing therethrough and the lengths of the coils, the distances which separate them axially and their outer diameter are determined so as to give to said field a prescribed homogeneity in said zone of interest with an optimized Power-Mass product.
Claim 2
Dependent Claim
104 words
A solenoidal magnet, particularly for NMR applications, of the type including an assembly of Bitter type coils disposed along a common longitudinal axis and symmetrically with respect to a median transverse plane of a zone of interest where the magnetic field reigns, wherein all the coils have substantially the same inner and outer diameter and are connected so as to have the same current flowing therethrough and the lengths of the coils, the distances which separate them axially and their outer diameter are determined so as to give to said field a prescribed homogeneity in said zone of interest with an optimized Power-Mass product.
Claim 3
Dependent Claim
21 words
The magnet as claimed in claim 1, wherein the disks of all said Bitter coils all have substantially the same thickness.
Claim 4
Dependent Claim
131 words
An NMR image forming installation including more especially a solenoid magnet for creating a basic field and a gradient coil system, said magnet being formed of an assembly of Bitter type coils disposed along a common longitudinal axis and symmetrically with respect to a median transverse plane of a zone of interest where the magnetic field reigns, wherein said coils have substantially the same inner and outer diameter and are connected so as to have the same current passing therethrough, the length of said coils and the distance which separate them axially and their outer diameter are determined so as to give to said field a prescribed homogeneity in said zone of interest with an optimized power-mass product and said gradient coil system is arranged outside said coils of said magnet.
Claim 5
Dependent Claim
131 words
An NMR image forming installation including more especially a solenoid magnet for creating a basic field and a gradient coil system, said magnet being formed of an assembly of Bitter type coils disposed along a common longitudinal axis and symmetrically with respect to a median transverse plane of a zone of interest where the magnetic field reigns, wherein said coils have substantially the same inner and outer diameter and are connected so as to have the same current passing therethrough, the length of said coils and the distance which separate them axially and their outer diameter are determined so as to give to said field a prescribed homogeneity in said zone of interest with an optimized power-mass product and said gradient coil system is arranged outside said coils of said magnet.
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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |