US4502008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for nuclear magnetic resonance spectroscopy
Assignee: Jeol Ltd
•
Filing: 1983-02-09
•
Granted: 1985-02-26
•
Expires: 2003-02-09
Abstract
Abstract A method and apparatus for nuclear magnetic resonance spectroscopy is disclosed which expands the decoupling bandwidth. In the method, a pulse train containing a series of radiofrequency pulses joined without interval is applied repeatedly to a sample, each radiofrequency pulse being phased at 0°, 90°, 180°, or 270°, and the radiofrequency carrier of the pulse train is reversed in phase at the interval longer than the repetitive cycle of the pulse train asynchronously with the repetition of application of the pulse train.
Inventors
- 👤 Muneki Ohuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:27
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/46; G01R33/4616
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
76 words
A decoupling method for nuclear magnetic resonance spectroscopy comprising, repeatedly applying a pulse train to a sample for decoupling, said pulse train containing a series of radiofrequency pulses joined without interval, each radiofrequency pulse being phased at 0°, 90°, 180°, or 270°, and reversing the phase of the radiofrequency carrier of the pulse train at the interval longer than the repetitive cycle of the pulse train asynchronously with the repetition of application of the pulse train.
Claim 2
Dependent Claim
76 words
A decoupling method for nuclear magnetic resonance spectroscopy comprising, repeatedly applying a pulse train to a sample for decoupling, said pulse train containing a series of radiofrequency pulses joined without interval, each radiofrequency pulse being phased at 0°, 90°, 180°, or 270°, and reversing the phase of the radiofrequency carrier of the pulse train at the interval longer than the repetitive cycle of the pulse train asynchronously with the repetition of application of the pulse train.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein said pulse train consists of at least two kinds of radiofrequency pulses of A° pulse and B° pulse.
Claim 4
Dependent Claim
33 words
The method of claim 2 wherein the value A of said A° pulse is chosen from 90 to 45 and the value B of said B° pulse is chosen from 240 to 90.
Claim 5
Dependent Claim
73 words
The method of claim 2 wherein said pulse train contains at least either of two unit pulse trains R +1 and R +1' and either of two unit pulse trains R -1 and R -1' , where R +1 , R +1' , R -1 , and R -1' are unit pulse trains consisting of radiofrequency pulses such that R.sub.+1 ------A°.sub.x ·B°.sub.y ·A°.sub.x R.sub.+1' ------A°.sub.x ·B°.sub.y R.sub.-1 ------A°.sub.-x ·B°.sub.-y ·A°.sub.-x R.sub.-1' ------A°.sub.-x ·B°.sub.-y.
Claim 6
Dependent Claim
110 words
Nuclear magnetic resonance spectrometer employing means for applying a decoupling radiofrequency magnetic field to a sample said means including: means for generating radiofrequency carrier for decoupling; means for providing said radiofrequency carrier with 0°, 90°, 180°, and 270° phases; means for producing a pulse train repeatedly, said pulse train containing a series of radiofrequency pulses joined without interval, said radiofrequency pulses having the predetermined phases and pulse widths and being arranged in predetermined order; means for reversing the phase of the radiofrequency carrier of the pulse train at an interval longer than the repetitive cycle of the pulse train and asynchronously with the repetition of application of the pulse train.
Claim 7
Dependent Claim
110 words
Nuclear magnetic resonance spectrometer employing means for applying a decoupling radiofrequency magnetic field to a sample said means including: means for generating radiofrequency carrier for decoupling; means for providing said radiofrequency carrier with 0°, 90°, 180°, and 270° phases; means for producing a pulse train repeatedly, said pulse train containing a series of radiofrequency pulses joined without interval, said radiofrequency pulses having the predetermined phases and pulse widths and being arranged in predetermined order; means for reversing the phase of the radiofrequency carrier of the pulse train at an interval longer than the repetitive cycle of the pulse train and asynchronously with the repetition of application of the pulse train.
References Cited (Backward Citations)
US4068161A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |