US2670375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of an isomer of amidone
Assignee: Mallinckrodt Chemical Works
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Filing: 1947-05-10
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Granted: 1954-02-23
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Expires: 1967-05-10
Abstract
No abstract record available.
Inventors
- 👤 Roger W Stoughton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
C; C07; C07C; C07C215/00; C07C215/46; C07C215/48; C07C215/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
THE METHOD OF FORMING THE ISOMER OF AMIDONE ND26 1.5565-1.5575 AND D25 1.03 WHOSE HYDROCHLORIDE HAS THE APPROXIMATE MELTING POINT 196-8* C. WHICH COMPRISES MIXING TOGETHER A DIMETHYLAMINOPROPYL-DIPHENYLACETONITRILE (M.P. 67-8* C.) AND AN ETHYL GRIGNARD REAGENT, HEATING THE MIXTURE TO A TEMPERATURE OF AT LAST APPROXMATELY 70* C. AND THEN HYDROLYZING THE PRODUCT.
Claim 2
Independent Claim
53 words
THE METHOD OF FORMING THE ISOMER OF AMIDONE ND26 1.5565-1.5575 AND D25 1.03 WHOSE HYDROCHLORIDE HAS THE APPROXIMATE MELTING POINT 196-8* C. WHICH COMPRISES MIXING TOGETHER A DIMETHYLAMINOPROPYL-DIPHENYLACETONITRILE (M.P. 67-8* C.) AND AN ETHYL GRIGNARD REAGENT, HEATING THE MIXTURE TO A TEMPERATURE OF AT LAST APPROXMATELY 70* C. AND THEN HYDROLYZING THE PRODUCT.
References Cited (Backward Citations)
US2387447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |