US5572127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhomogeneities in static magnetic fields near superconducting coils
Assignee: Bruker Biospin Corp
•
Filing: 1995-06-07
•
Granted: 1996-11-05
•
Expires: 2015-06-07
Abstract
Abstract Inhomogeneities in the magnetic field in the vicinity of a superconducting NMR receiver coil are avoided by placing the probe, at about room temperature, within the magnetic field, cooling rapidly to just above the critical temperature of the superconductor and then controllably cooling the coil to operating temperature at a rate of 3 K./minute or less.
Inventors
- 👤 Wai H. Wong
- 👤 Vincent Y. Kotsubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:54
CPC Classifications
F; F25; F25D; F25D19/00; F25D19/006; G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/32; G01R33/34; G01R33/34015; G01R33/3403; G01R33/34023
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
A method of preventing inhomogeneities in a static magnetic field near a superconducting coil having a critical temperature T c and a critical field H c1 comprising: (a) placing the coil in a static magnetic field of at least H c1 ; (b) cooling the coil in the magnetic field from a temperature above the T c of the coil at a rate of less than 3 K./minute to a desired operational temperature for the coil; (c) maintaining the coil at the operational temperature.
Claim 2
Independent Claim
84 words
A method of preventing inhomogeneities in a static magnetic field near a superconducting coil having a critical temperature T c and a critical field H c1 comprising: (a) placing the coil in a static magnetic field of at least H c1 ; (b) cooling the coil in the magnetic field from a temperature above the T c of the coil at a rate of less than 3 K./minute to a desired operational temperature for the coil; (c) maintaining the coil at the operational temperature.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the superconducting coil is comprised of YBCO.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein the cooling is at a rate of about 2 K./minute.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the operational temperature is between 20 K. and 35 K.
Claim 6
Dependent Claim
13 words
The method of claim 4 wherein the operational temperature is about 30 K.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein the cooling is by use of a Gifford-McMahon refrigerator.
Claim 8
Dependent Claim
27 words
The method of claim 1, further comprising the step of rapidly cooling the coil from room temperature to a temperature above the T c of the coil.
Claim 9
Dependent Claim
13 words
The method of claim 1 wherein the slowly cooling is at constant rate.
Claim 10
Dependent Claim
11 words
The method of claim 1 wherein the slowly cooling is monotonic.
Claim 11
Dependent Claim
15 words
The method of claim 1, wherein the static field is between about 1T and 18T.
References Cited (Backward Citations)
US5276398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-05 | 2000-05-06 | 2000-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-05 | 2004-05-06 | 2004-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-05 | 2008-05-06 | 2008-11-05 | $7700.00 | Window Closed / Lapsed |