Patent US4808956A successfully refreshed from Google Patents.
US4808956A
Expired / Lapsed
US
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Coreless solenoidal magnet
Assignee: General Electric CGR SA
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Filing: 1985-11-29
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Granted: 1989-02-28
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Expires: 2005-11-29
Abstract
Abstract A coreless solenoidal magnet is provided formed by a Bitter coil with improved field homogeneity. According to the invention the tie rods of the stack of disks are used for bringing the current back towards one of the axial ends of the magnet without creating a parasite field.
Inventors
- 👤 Guy Aubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:23
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/20; H01F7/202
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A solenoidal magnet having at least one Bitter type coil, including essentially a substantially helical winding formed by a stack, with interpositioning of insulators, of conducting disks each having a cut so as to form a turn, said turns being connected to each other, which magnet further includes at least one conductor ensuring the return of the current to one of the axial ends of the magnet, arranged so as to distribute the flow of said current longitudinally over a cylindrical surface coaxial with said coil.
Claim 2
Dependent Claim
86 words
A solenoidal magnet having at least one Bitter type coil, including essentially a substantially helical winding formed by a stack, with interpositioning of insulators, of conducting disks each having a cut so as to form a turn, said turns being connected to each other, which magnet further includes at least one conductor ensuring the return of the current to one of the axial ends of the magnet, arranged so as to distribute the flow of said current longitudinally over a cylindrical surface coaxial with said coil.
Claim 3
Dependent Claim
65 words
The solenoidal magnet as claimed in claim 1, including several longitudinal rods evenly spaced apart over said cylindrical surface and said rods are connected together so as to define a sort of squirrel cage, this cage being connected in series, as a whole, with said coil so that said rods have flowing therethrough substantially equal fractions of the total current which passes through said coil.
Claim 4
Dependent Claim
40 words
The magnet as claimed in claim 2 of a type in which said stack of disks is held in position by means of insulated tie rods, wherein said longitudinal rods are formed by at least some of said tie rods.
Claim 5
Dependent Claim
59 words
The magnet as claimed in claim 2 or 3, of the type in which said stack is clamped between two conducting end plates, wherein the longitudinal rods in the vicinity of the end plates situated at the other axial end of said magnet are connected electrically to this plate so as to distribute the current between said longitudinal rods.
Claim 6
Dependent Claim
75 words
The magnet as claimed in claim 4, wherein said longitudinal rods pass through the end plate situated at the first axial end mentioned of the magnet while being electrically insulated therefrom and this end plate has as many connecting terminals as there are such rods situated respectively in the vicinity of each of them so as to allow said magnet to be supplied with electricity from an equal number of pairs of parallel conducting wires.
Claim 7
Dependent Claim
20 words
The magnet as claimed in claim 5, wherein each pair of conducting wires is a cable with a coaxial structure.
Claim 8
Dependent Claim
38 words
The coil magnet as claimed in one of claims 1-4, wherein each turn end has a tongue and groove joint and two adjacent turns are connected end to end by welding such tongue and grooves of complementary shapes.
Claim 9
Dependent Claim
28 words
The coil magnet as claimed in one of claims 1-3, wherein said conducting disks are made from aluminum and said insulator is formed by anodization of these rings.
References Cited (Backward Citations)
US3281737A
Cited
US4506224A
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US4517516A
Cited
US4694255A
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US4591818A
Cited
US4602234A
Cited
US4500860A
Cited
US4686473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |