US2772312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of n:n'-dibenzyl ethylene diamine
Assignee: Distillers Co Yeast Ltd
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Filing: 1954-12-20
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Granted: 1956-11-27
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 Southwood John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:34
CPC Classifications
C; C07; C07D; C07D219/00; C07D219/14; C07C; C07C209/00; C07C209/30; C07C209/32; C07C209/36; C07C211/00; C07C211/43; C07C211/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PROCESS FOR THE PRODUCTION OF N:N''DIBENZYL ETHYLENE DIAMINE WHICH COMPRISES REDUCING N:N''DIBENZYLIDENE ETHYLENE DIAMINE WITH AN EXCESS OF METALLIC SODIUM AND A MIXTURE OF METHANOL AND ISOPROPANOL, THE PROPORTION METHANOL:ISOPROPANOL BEING IN THE RANGE 1:4 TO 1:6 BY WEITH AND THE WEIGHT OF SAID MIXTURE BEING FROM 4 TO 5 1/2 TIMES THE WEIGHT OF THE N:N''-DIBENZYLIDENE ETHYLENE DIAMINE, AT A TEMPERATURE APPROXIMATING THE REFLUXING TEMPERATURE OF THE REACTION MIXTURE AT ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
74 words
A PROCESS FOR THE PRODUCTION OF N:N''DIBENZYL ETHYLENE DIAMINE WHICH COMPRISES REDUCING N:N''DIBENZYLIDENE ETHYLENE DIAMINE WITH AN EXCESS OF METALLIC SODIUM AND A MIXTURE OF METHANOL AND ISOPROPANOL, THE PROPORTION METHANOL:ISOPROPANOL BEING IN THE RANGE 1:4 TO 1:6 BY WEITH AND THE WEIGHT OF SAID MIXTURE BEING FROM 4 TO 5 1/2 TIMES THE WEIGHT OF THE N:N''-DIBENZYLIDENE ETHYLENE DIAMINE, AT A TEMPERATURE APPROXIMATING THE REFLUXING TEMPERATURE OF THE REACTION MIXTURE AT ATMOSPHERIC PRESSURE.
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) | 1959-11-27 | 1960-05-28 | 1960-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-27 | 1964-05-28 | 1964-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-27 | 1968-05-28 | 1968-11-27 | $7700.00 | Window Closed / Lapsed |