US5545994A
Expired / Lapsed
US
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Reduction of ambient susceptibility perturbations of an NMR spectrometer
Assignee: Agilent Technologies Inc
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Filing: 1995-05-02
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Granted: 1996-08-13
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Expires: 2015-05-02
Abstract
Abstract The volume magnetic susceptibility of an NMR probe is established and maintained at a desired value, such as a value characterizing other components of the probe, by a linear combination of partial pressures of respective fluids introduced into the sensitive volume of the probe.
Inventors
- 👤 Thomas M. Barbara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:54
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/30; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/565; G01R33/56527
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
An NMR apparatus for examining the constituents of an object, said object enclosed within a sensitive volume defined by rf probe apparatus, comprising first fluid introduction regulator for maintaining a partial concentration of said first fluid at partial concentration P 1 within said sensitive volume, second fluid introduction regulator for maintaining a partial concentration of said second fluid at partial concentration P 2 within said sensitive volume, said first and second fluids respectively having molar magnetic susceptibilities of x 1 and x 2 whereby the volume susceptibility of the resulting fluid mixture within said sensitive volume is a linear combination of said molar magnetic susceptibilities and exhibits a desired value.
Claim 2
Dependent Claim
110 words
An NMR apparatus for examining the constituents of an object, said object enclosed within a sensitive volume defined by rf probe apparatus, comprising first fluid introduction regulator for maintaining a partial concentration of said first fluid at partial concentration P 1 within said sensitive volume, second fluid introduction regulator for maintaining a partial concentration of said second fluid at partial concentration P 2 within said sensitive volume, said first and second fluids respectively having molar magnetic susceptibilities of x 1 and x 2 whereby the volume susceptibility of the resulting fluid mixture within said sensitive volume is a linear combination of said molar magnetic susceptibilities and exhibits a desired value.
Claim 3
Dependent Claim
24 words
The NMR apparatus of claim 1 wherein the number of fluids which are mixed to obtain said desired volume susceptibility is at least two.
Claim 4
Dependent Claim
26 words
The NMR apparatus of claim 1 wherein said desired value is substantially the magnetic susceptibility of a portion of the structural members forming said sensitive volume.
Claim 5
Dependent Claim
35 words
The NMR apparatus of claim 1 wherein said sensitive volume is in the interior of the bore of a superconducting magnet and said fluid mixture is allowed to flow through said bore and escape therefrom.
Claim 6
Dependent Claim
35 words
The NMR apparatus of claim 1 wherein said sensitive volume is in the interior of the bore of a superconducting magnet and said fluid mixture is allowed to flow through said bore and recirculate therethrough.
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) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |