US4509030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Correction coil assembly for NMR magnets
Assignee: General Electric Co
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Filing: 1984-07-05
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Granted: 1985-04-02
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Expires: 2004-07-05
Abstract
Abstract An NMR magnet correction coil comprises a plurality of cylindrical coil forms coaxially disposed with radially exterior coil forms possessing saddle coils so as to provide slits in the exterior forms. The outermost coil form is wrapped with a non-magnetic wire in order to keep the forms in a fixed relationship. If three or more coil forms are employed, the inner forms are wrapped with a band of material which also serves to provide a spiral flowpath for cryogens such as liquid helium. A pair of keys is provided for tieoff and insulation of the outer wire band, as well as for positioning of the entire assembly.
Inventors
- 👤 Mark E. Vermilyea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:55
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/387; G01R33/3875; H01F6/00; H01F6/06; G01R33/381; G01R33/3815; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/879
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
A correction coil assembly, especially for use in superconductive magnets and other cryogenic environments, said assembly comprising: at least one electrical coil disposed on a first cylindrical form; at least one transverse coil disposed on a second cylindrical coil form, said second form having a longitudinal slit therein, said second form being disposed coaxially about said first form and over said coil disposed on said first form; an insulated, non-magnetic wire having a coefficient of thermal expansion greater than that of the material of said second coil form, said wire being tightly wrapped around said second coil form so as to securely hold said second form against said first form under cryogenic conditions; and a pair of insulative supports diposed at and fixed to each end of said assembly, each end of said wire being attached to a distinct one of said supports.
Claim 2
Dependent Claim
143 words
A correction coil assembly, especially for use in superconductive magnets and other cryogenic environments, said assembly comprising: at least one electrical coil disposed on a first cylindrical form; at least one transverse coil disposed on a second cylindrical coil form, said second form having a longitudinal slit therein, said second form being disposed coaxially about said first form and over said coil disposed on said first form; an insulated, non-magnetic wire having a coefficient of thermal expansion greater than that of the material of said second coil form, said wire being tightly wrapped around said second coil form so as to securely hold said second form against said first form under cryogenic conditions; and a pair of insulative supports diposed at and fixed to each end of said assembly, each end of said wire being attached to a distinct one of said supports.
Claim 3
Dependent Claim
76 words
The assembly of claim 1 further including: at least one transverse coil disposed on a third cylindrical coil form, said third form having a longitudinal slit therein, said third coil form also being disposed coaxially between said first and second coil forms; a flat, non-magnetic band, insulated from said coils on said third form, said band being wrapped around said third coil form so as to be disposed between said second and said third coil forms.
Claim 4
Dependent Claim
11 words
The assembly of claim 2 in which said band comprises aluminum.
Claim 5
Dependent Claim
23 words
The apparatus of claim 2 in which each end of said band is affixed to a distinct end of an underlying coil form.
Claim 6
Dependent Claim
23 words
The assembly of claim 4 in which said band is affixed by means of pins disposed through said slit in said second form.
Claim 7
Dependent Claim
18 words
The assembly of claim 2 in which said third coil form comprises glass, fiber and epoxy composite material.
Claim 8
Dependent Claim
11 words
The assembly of claim 1 wherein said wire comprises superconductive material.
Claim 9
Dependent Claim
25 words
The assembly of claim 1 in which said electrical coil on said first form and said transverse coils on said second form comprise superconductive material.
Claim 10
Dependent Claim
17 words
The assembly of claim 1 in which said first form comprises glass fiber and epoxy composite material.
Claim 11
Dependent Claim
17 words
The assembly of claim 1 in which said second form comprises glass, fiber and epoxy composite material.
Claim 12
Dependent Claim
64 words
The assembly of claim 1 in which said insulative supports comprise: a T-shaped key member affixed to said first form with an end thereof extending into a mating notch in said second form so as to provide axial and circumferential alignment of said second form with respect to said first form; an insulative bushing affixed to said key member for attachment of said wire.
Claim 13
Dependent Claim
13 words
The assembly of claim 11 in which said T-shaped key member comprises aluminum.
Claim 14
Dependent Claim
139 words
The assembly of claim 1 further including: at least one transverse coil disposed on a third cylindrical coil form, said third form having a longitudinal slit therein, said third coil form being disposed coaxially between and first and second coil forms; a flat, non-magnetic band, insulated from said coils on said third form, said band being wrapped around said third coil form so as to be disposed between said second coil form and said third coil form; a T-shaped key member affixed to said first coil form with an end thereof extending into a mating notch in said second and third coil forms so as to provide axial and circumferential alignment of said second and third coil forms with respect to said first coil form; and an insulative bushing affixed to said key member for attachment of said wire.
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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |