US3665351A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconductive magnets
Assignee: General Electric Co
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Filing: 1970-07-09
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Granted: 1972-05-23
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Expires: 1990-07-09
Abstract
Abstract Superconductive tape-wound solenoids used for the production of high magnetic fields are susceptible to being driven into the normal resistance state by flux jumping occurring in the end coils. This is caused by the high concentration of magnetic flux components perpendicular to the planes of the tapes in these coils. The performance of such solenoids may be substantially improved by providing an alternative path for such flux components through a body having a relatively high saturation magnetization such as iron or mild steel closely adjacent the end coils but electrically isolated therefrom.
Inventors
- 👤 Gordon W Donaldson
- 👤 Charles D Graham Jr
- 👤 Howard R Hart Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:54
CPC Classifications
H; H01; H01F; H01F6/00; H01F6/02; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/879
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
115 words
A superconductive solenoid comprised of a stacked array of disc-like superconductive members, each said disc-like superconductive member being formed of a spirally wound superconductive tape, and at least one disc-like body member of ferromagnetic material being positioned at at least one end portion of said stacked array where components of magnetic flux perpendicular to the tape surface are high as an alternate path for said components of magnetic flux, each of said members and said disc-like body of ferromagnetic material having a central opening therethrough, and each being stacked to form a solenoid having a central continuous open space therethrough, said disclike body member of ferromagnetic material being electrically isolated from said disc-like superconductive members.
Claim 2
Dependent Claim
115 words
A superconductive solenoid comprised of a stacked array of disc-like superconductive members, each said disc-like superconductive member being formed of a spirally wound superconductive tape, and at least one disc-like body member of ferromagnetic material being positioned at at least one end portion of said stacked array where components of magnetic flux perpendicular to the tape surface are high as an alternate path for said components of magnetic flux, each of said members and said disc-like body of ferromagnetic material having a central opening therethrough, and each being stacked to form a solenoid having a central continuous open space therethrough, said disclike body member of ferromagnetic material being electrically isolated from said disc-like superconductive members.
Claim 3
Dependent Claim
24 words
A superconductive solenoid according to Claim 1 wherein said disc-like body of ferromagnetic material is positioned as the end member of said stacked array.
Claim 4
Dependent Claim
32 words
A superconductive solenoid according to claim 2 wherein a second disc-like body member of ferromagnetic material is positioned between two adjacent superconductive members at the same end portion as said end member.
Claim 5
Dependent Claim
28 words
A superconductive solenoid according to Claim 1 wherein a disc-like body member of ferromagnetic material is positioned as an end member at each end of said stacked array.
Claim 6
Dependent Claim
35 words
A superconductive solenoid according to claim 4 wherein at least one adDitional disc-like body member of ferromagnetic material is positioned between two adjacent superconductive members at at least one end portion of said stacked array.
Claim 7
Dependent Claim
23 words
A superconductive solenoid according to Claim 1 wherein said superconductive tape is comprised of niobium having a coating comprised of superconductive niobium-tin compound.
Claim 8
Dependent Claim
19 words
A superconductive solenoid according to Claim 1 wherein said superconductive tape is laminated to a tape of non-superconductive metal.
Claim 9
Dependent Claim
13 words
A superconductive solenoid according to Claim 7 wherein said non-superconductive metal is copper.
Claim 10
Dependent Claim
13 words
A superconductive solenoid according to Claim 1 wherein said ferromagnetic material is iron.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |