US4968939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring the NMR spectrum of an orientationally disordered sample
Assignee: University of California
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Filing: 1989-06-27
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Granted: 1990-11-06
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Expires: 2009-06-27
Abstract
Abstract An improved NMR probe and method are described which substantially improve the resolution of NMR measurements made on powdered or amorphous or otherwise oreintationally disordered samples. The apparatus mechanically varies the orientation of the sample such that the time average of two or more sets of spherical harmonic functions is zero.
Inventors
- 👤 Alexander Pines
- 👤 Ago Samoson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:48
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/30; G01R33/307
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
An apparatus for measuring the NMR spectra of a sample, said apparatus comprising: means for holding said sample in a magnetic field, the orientation of said sample being specified by a set of angles, Ω, said set of angles being measured with reference to the direction of said magnetic field; and orientation means for causing the orientation of said sample to assume a succession of discrete orientations relative to said magnetic field direction, the ith said orientation being specified by a set of angles Ω i , where i runs from 1 to N, the time spent at Ω i being T i , wherein ##EQU12## and wherein Y pm and Y qm are generalized spherical harmonic functions of order p and q, respectively, p and q being greater than 0 and different from each other.
Claim 2
Independent Claim
136 words
An apparatus for measuring the NMR spectra of a sample, said apparatus comprising: means for holding said sample in a magnetic field, the orientation of said sample being specified by a set of angles, Ω, said set of angles being measured with reference to the direction of said magnetic field; and orientation means for causing the orientation of said sample to assume a succession of discrete orientations relative to said magnetic field direction, the ith said orientation being specified by a set of angles Ω i , where i runs from 1 to N, the time spent at Ω i being T i , wherein ##EQU12## and wherein Y pm and Y qm are generalized spherical harmonic functions of order p and q, respectively, p and q being greater than 0 and different from each other.
Claim 3
Dependent Claim
9 words
The apparatus of claim 1 wherein p=2 and q=4.
Claim 4
Dependent Claim
17 words
The apparatus of claim 2 wherein N=6 and T i =T, a constant, for i=1 to 6.
Claim 5
Independent Claim
132 words
A method for measuring the NMR spectra of a sample, comprising the steps of: placing said sample in a magnetic field, the orientation of said sample being specified by a set of angles, Ω, said set of angles being measured with reference to the direction of said magnetic field; and causing the orientation of said sample to assume a succession of discrete orientations relative to said magnetic field direction, the ith said orientation being specified by a set of angles Ω i , where i runs from 1 to N, the time spent at Ω i being T i , wherein ##EQU13## and wherein Y pm and Y qm are generalized spherical harmonic functions of order p and q, respectively, p and q being greater than 0 and different from each other.
Claim 6
Independent Claim
132 words
A method for measuring the NMR spectra of a sample, comprising the steps of: placing said sample in a magnetic field, the orientation of said sample being specified by a set of angles, Ω, said set of angles being measured with reference to the direction of said magnetic field; and causing the orientation of said sample to assume a succession of discrete orientations relative to said magnetic field direction, the ith said orientation being specified by a set of angles Ω i , where i runs from 1 to N, the time spent at Ω i being T i , wherein ##EQU13## and wherein Y pm and Y qm are generalized spherical harmonic functions of order p and q, respectively, p and q being greater than 0 and different from each other.
Claim 7
Dependent Claim
9 words
The method of claim 4 wherein p=2 and q=4.
Claim 8
Dependent Claim
17 words
The method of claim 5 wherein N=6 and T i =T, a constant, for i=1 to 6.
References Cited (Backward Citations)
US4301410A
Cited
US4352066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |