US4816962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniform magnetic field coil
Assignee: Mitsubishi Electric Corp
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Filing: 1987-11-20
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Granted: 1989-03-28
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Expires: 2007-11-20
Abstract
Abstract A uniform magnetic field coil assembly having a plurality of pairs of coil elements each included in circuit comprising the parallel connection of a permanent current switch and its protecting means and an individual exciting power source, wherein the plurality of pairs of coil elements are symmetrically disposed against a plane perpendicular to the central axis of the uniform magnetic field coil assembly in the longitudinal direction and the plurality of pairs of coil elements are connected in series, thereby regulating the current flowing to each of the plurality of pairs of coil assembly elements for forming the uniform magnetic field coil as predetermined.
Inventors
- 👤 Tadatoshi Yamada
- 👤 Masao Morita
- 👤 Shunji Yamamoto
- 👤 Tetsuya Matsuda
- 👤 Masatami Iwamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:43
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/387; G01R33/3875; G01R33/381; G01R33/3815; G01R33/389; H; H02; H02H; H02H7/00; H02H7/001; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
A superconducting uniform magnetic field coil assembly for generating a uniform magnetic field, said assembly having a longitudinal axis and comprising: pairs of coil elements arranged along a longitudinal axis wherein said coil elements in each pair are symmetrically disposed about a plane perpendicular to the longitudinal axis and said coil elements are electrically connected in series; a plurality of permanent current switch means, respectively electrically connected in parallel with corresponding ones of said coil elements, for controlling a current flowing through said corresponding ones of said coil elements; a plurality of protection means, respectively electrically connected in parallel with corresponding ones of said coil elements, for respectively protecting said corresponding ones of said current switch means; and individual exciting power source means, respectively electrically connected in parallel with each corresponding one of said coil elements, for respectively providing current to said corresponding individual ones of said coil elements and for regulating current flowing to said individual coil elements to compensate for irregularities in the magnetic field produced by said assembly.
Claim 2
Dependent Claim
171 words
A superconducting uniform magnetic field coil assembly for generating a uniform magnetic field, said assembly having a longitudinal axis and comprising: pairs of coil elements arranged along a longitudinal axis wherein said coil elements in each pair are symmetrically disposed about a plane perpendicular to the longitudinal axis and said coil elements are electrically connected in series; a plurality of permanent current switch means, respectively electrically connected in parallel with corresponding ones of said coil elements, for controlling a current flowing through said corresponding ones of said coil elements; a plurality of protection means, respectively electrically connected in parallel with corresponding ones of said coil elements, for respectively protecting said corresponding ones of said current switch means; and individual exciting power source means, respectively electrically connected in parallel with each corresponding one of said coil elements, for respectively providing current to said corresponding individual ones of said coil elements and for regulating current flowing to said individual coil elements to compensate for irregularities in the magnetic field produced by said assembly.
Claim 3
Dependent Claim
38 words
A superconducting uniform magnetic field coil assembly according to claim 1 wherein said plurality of permanent current switch means includes heater means for selectively varying the temperature of individual ones of said plurality of permanent current switch means.
Claim 4
Dependent Claim
34 words
A superconducting uniform magnetic field coil assembly according to claim 2 further comprising a cryostat housing said pairs of coil elements, said plurality of permanent current switch means, and said plurality of protection means.
Claim 5
Dependent Claim
23 words
A superconducting uniform magnetic field coil assembly according to claim 1 having a common exciting power source connected in parallel with said assembly.
Claim 6
Dependent Claim
23 words
A superconducting uniform magnetic field coil assembly according to claim 4 having a common permanent current switch connected in parallel with said assembly.
Claim 7
Dependent Claim
22 words
A superconducting uniform magnetic field coil assembly according to claim 1 wherein there are three to five pairs of said coil elements.
Claim 8
Dependent Claim
40 words
A superconducting uniform magnetic field coil assembly according to claim 1 wherein each of said coil elements in a said pair is substantially the same size, but not all of said coil elements in said assembly are the same size.
References Cited (Backward Citations)
US3406333A
Cited
US3474294A
Cited
US3419904A
Cited
US3510832A
Cited
US3568002A
Cited
DE2301152A1
Cited
US3711744A
Cited
US4467384A
Cited
US4535291A
Cited
US4683434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-03-27 | 1992-09-26 | 1993-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-27 | 1996-09-26 | 1997-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-27 | 2000-09-26 | 2001-03-28 | $7700.00 | Window Closed / Lapsed |