US3657147A
Expired / Lapsed
US
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Novel standards for n.m.r. spectroscopy
Assignee: Merck Patent GmbH
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Filing: 1969-07-22
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Granted: 1972-04-18
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Expires: 1989-07-22
Abstract
Abstract FOR N.M.R. DETERMINATIONS, THERE ARE PROVIDED IMPROVED STANDARDS AS FOLLOWS: (A) 1,1,3,3,5,5 - HEXAKIS - (TRIDEUTEROMETHYL)-1,3,5-TRISILA-CYCLOHEXANE, (B) A,A,B,B, - TETRADEUTERO - B - (TRIMETHYLSILYL) - PROPIONIC ACID, (C) A,A,B,B,O - PENTADEUTERO - B - (TRIMETHYLSILYL) - PROPIONIC ACID, (D) AN ALKALI METAL SALT OF (B), (E) AN ALKALI METAL SALT OF (C), (F) B-(TRIMETHYLSILYL)-PROPIONIC ACID, AND (G) AN ALKALI METAL SALT OF (F).
Inventors
- 👤 Ludwig Pohl
- 👤 Manfred Eckle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:36
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/28; G01R33/281; Y; Y10; Y10T; Y10T436/00; Y10T436/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |