Patent US3911355A successfully refreshed from Google Patents.
US3911355A
Expired / Lapsed
US
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Nmr spectrometer probe with eddy current brake
Assignee: PerkinElmer Ltd
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Filing: 1974-05-16
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Granted: 1975-10-07
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Expires: 1994-05-16
Abstract
Abstract Disclosed is a sample spinning system for an NMR Spectrometer, the system comprising an electrically conductive device mounted for rotation with a spinnable sample tube and arranged to interfere in operation with stray magnetic field in the working gap of the spectrometer to produce an eddy current breaking effect. There is also described a spinner assembly comprising an air-turbine rotor in addition to the electrically conductive device and a probe adapted to be moved into and out of the working gap, the spinning system forming part of the probe.
Inventors
- 👤 John Bryant Leane
- 👤 Peter Higham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:03
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/30; G01R33/307; G01R33/32; G01R33/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
In a gyromagnetic resonance spectrometer provided with means for spinning a longitudinally extending sample holder around its longitudinal axis transversally to the lines of force extending between two opposed magnetic poles defining the working gap of a polarizing magnet, the combination with said sample holder of an eddy-current brake device mounted for rotation with the sample holder in the magnetic field external to the magnetic field volume within which the sample is to be accommodated, said device tending to stabilize sample spinning speed by virtue of the electromagnetic coupling set up between the spinning device and the magnetic field without causing significant magnetic field disturbances at the sample.
Claim 2
Dependent Claim
108 words
In a gyromagnetic resonance spectrometer provided with means for spinning a longitudinally extending sample holder around its longitudinal axis transversally to the lines of force extending between two opposed magnetic poles defining the working gap of a polarizing magnet, the combination with said sample holder of an eddy-current brake device mounted for rotation with the sample holder in the magnetic field external to the magnetic field volume within which the sample is to be accommodated, said device tending to stabilize sample spinning speed by virtue of the electromagnetic coupling set up between the spinning device and the magnetic field without causing significant magnetic field disturbances at the sample.
Claim 3
Dependent Claim
15 words
The combination of claim 1, wherein said device is an electrically conductive generally cylindrical member.
Claim 4
Dependent Claim
123 words
In a nuclear magnetic resonance (NMR) spectrometer provided with means for spinning a longitudinally extending sample holder within a probe around its longitudinal axis transversally to the lines of force extending between two opposed magnetic poles defining the working gap of a polarizing magnet, the combination with said probe, said sample holder and said magnet of an eddy-current brake device mounted for rotation with the sample holder in the magnetic field external to the magnetic field volume of the working gap within which the NMR sample is to be accommodated, said device tending to stabilize sample spinning speed by virtue of the electromagnetic coupling set up between the spinning device and the magnetic field without causing significant magnetic field disturbances at the sample.
Claim 5
Dependent Claim
123 words
In a nuclear magnetic resonance (NMR) spectrometer provided with means for spinning a longitudinally extending sample holder within a probe around its longitudinal axis transversally to the lines of force extending between two opposed magnetic poles defining the working gap of a polarizing magnet, the combination with said probe, said sample holder and said magnet of an eddy-current brake device mounted for rotation with the sample holder in the magnetic field external to the magnetic field volume of the working gap within which the NMR sample is to be accommodated, said device tending to stabilize sample spinning speed by virtue of the electromagnetic coupling set up between the spinning device and the magnetic field without causing significant magnetic field disturbances at the sample.
Claim 6
Dependent Claim
15 words
The combination of claim 3, wherein said device is an electrically conductive generally cyliNdrical member.
Claim 7
Dependent Claim
14 words
The combination of claim 4, wherein said device is positioned within the sample holder.
Claim 8
Dependent Claim
32 words
The combination of claim 5, wherein means are provided for enabling the position of the device to be adjusted by the user without having to remove the sample holder from the probe.
Claim 9
Dependent Claim
17 words
The combination of claim 4, wherein said device is positioned on the outside of the sample holder.
Claim 10
Dependent Claim
110 words
In a nuclear magnetic resonance spectrometer provided with means including an air-turbine rotor assembly mounted on a longitudinally extending sample holder for spinning said sample around its longitudinal axis transversally to the lines of force extending between two opposed magnetic poles defining the gap of a polarizing magnet, the combination with said assembly of an eddy-current brake device mounted on said assembly for rotation with the sample holder in the stray field barrelling out from the poles, said device tending to stabilize sample spinning speed by virtue of the electrogmagnetic coupling set up between the spinning device and the magnetic field without causing significant magnetic field disturbances at the sample.
Claim 11
Dependent Claim
110 words
In a nuclear magnetic resonance spectrometer provided with means including an air-turbine rotor assembly mounted on a longitudinally extending sample holder for spinning said sample around its longitudinal axis transversally to the lines of force extending between two opposed magnetic poles defining the gap of a polarizing magnet, the combination with said assembly of an eddy-current brake device mounted on said assembly for rotation with the sample holder in the stray field barrelling out from the poles, said device tending to stabilize sample spinning speed by virtue of the electrogmagnetic coupling set up between the spinning device and the magnetic field without causing significant magnetic field disturbances at the sample.
Claim 12
Dependent Claim
31 words
The combination as claimed in claim 8, wherein said assembly is a plastic moulding and the eddy-current brake device is an electrically conductive generally annular member forming part of said assembly.
References Cited (Backward Citations)
US3091732A
Cited
US3681683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |