US4026953A
Expired / Lapsed
US
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Solvents for NMR spectroscopy
Assignee: Merck Patent GmbH
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Filing: 1975-10-24
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Granted: 1977-05-31
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Expires: 1995-10-24
Abstract
Abstract Organic solvents containing less than 0.2 atom percent of 13 C and which preferably are at least partially deuterated are produced from 13 C-depleted gaseous carbon compounds and are advantageously employed as solvents for 13 C NMR spectroscopy.
Inventors
- 👤 Ludwig Pohl
- 👤 Werner Theysohn
- 👤 Richard Unger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:34
CPC Classifications
G; G01; G01N; G01N24/00; G01N24/08; C; C07; C07C; C07C17/00; C07C17/093; C07C17/10; C07C19/00; C07C19/01; C07C19/03; C07C19/041; C07C275/00; C07C275/04; C07C275/06; C07C31/00; C07C31/02; C07C31/04; C07C31/08; C07B; C07B2200/00; C07B2200/05; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/942
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
19 words
An at least partially deuterated methanol or ethanol having a carbon-13 content of not more than 0.2 atom percent.
Claim 2
Dependent Claim
19 words
An at least partially deuterated methanol or ethanol having a carbon-13 content of not more than 0.2 atom percent.
Claim 3
Dependent Claim
7 words
A perdeuterated methanol according to claim 1.
Claim 4
Dependent Claim
7 words
A perdeuterated ethanol according to claim 1.
Claim 5
Dependent Claim
18 words
A perdeuterated methanol according to claim 1 having a carbon-13 content of not more than 0.1 atom percent.
Claim 6
Dependent Claim
18 words
A perdeuterated ethanol according to claim 1 having a carbon-13 content of not more than 0.1 atom percent.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |