US3839689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detachable leads for a superconducting magnet
Assignee: Individual
•
Filing: 1973-01-08
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Granted: 1974-10-01
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Expires: 1993-01-08
Abstract
Abstract A superconducting magnet coil has current supplied thereto through external connection leads. In the persistent current mode the leads are superfluous since current circulation is maintained by a superconducting link across the coil. Accordingly to prevent heat losses by heat conduction through the leads they have joints so that the leads can be detached from the coil by manipulation from outside the cryostat thus enabling the leads to be completely removed when the magnet is in use. The joints in the leads may comprise screw-threaded male and female members or else plug and socket members. In either case provision is made for reattachment of the leads from outside the cryostat without interruption of the persistent current.
Inventors
- 👤 P Hanley
- 👤 Kinnon J Mc
- 👤 R Wheatley
- 👤 M Biltcliffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:03
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/38; G01R33/381; G01R33/3815; H; H01; H01F; H01F6/00; H01F6/006; H01F6/06; H01F6/065; H02; H02H; H02H7/00; H02H7/001; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/879
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
86 words
A superconducting magnet comprising a cryostat containing a superconducting coil designed to carry current and generate a magnetic field, a short-circuiting superconducting link connected across the coil to enable current in the coil to persist, and electrical current supply leads extending through the cryostat to the coil, said leads including joints therein positioned within the cryostat for enabling the leads to be detached from the coil and removed from the cryostat without interrupting persistent current and thus reduce heat conduction to the cryostat through the leads.
Claim 2
Dependent Claim
86 words
A superconducting magnet comprising a cryostat containing a superconducting coil designed to carry current and generate a magnetic field, a short-circuiting superconducting link connected across the coil to enable current in the coil to persist, and electrical current supply leads extending through the cryostat to the coil, said leads including joints therein positioned within the cryostat for enabling the leads to be detached from the coil and removed from the cryostat without interrupting persistent current and thus reduce heat conduction to the cryostat through the leads.
Claim 3
Dependent Claim
37 words
The magnet as claimed in claim 1 in which the joints are positioned close to the coil and are arranged so that the leads can be readily detached and re-attached to the coil from outside the cryostat.
Claim 4
Dependent Claim
18 words
The magnet as claimed in claim 1 in which the joints comprise co-operating screw-threaded male and female members.
Claim 5
Dependent Claim
27 words
The magnet as claimed in claim 3 in which the female members have bell mouth openings to assist in location of the members when re-attaching the leads.
Claim 6
Dependent Claim
16 words
The magnet as claimed in claim 1 in which the joints comprise plug and socket members.
Claim 7
Dependent Claim
27 words
The magnet as claimed in claim 5 in which the socket members have bell mouth openings to assist in location of the members when re-attaching the leads.
Claim 8
Dependent Claim
24 words
The magnet as claimed in claim 1 in which gas-tight seals are provided where the leads pass through the outer wall of the cryostat.
Claim 9
Dependent Claim
32 words
The magnet as claimed in claim 7 in which the gas-tight seals are provided with means for enabling caps to be secured thereto in a gas-tight manner after removal of the leads.
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) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |