US2769841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ethylene polyamines
Assignee: Dow Chemical Co
•
Filing: 1953-12-23
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Granted: 1956-11-06
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Expires: 1973-12-23
Abstract
No abstract record available.
Inventors
- 👤 Stanley W Dylewski
- 👤 Harvey G Dulude
- 👤 Glenn W Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:16
CPC Classifications
C; C07; C07C; C07C209/00; C07C209/04; C07C209/06; C07C209/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
IN A PROCESS FOR MAKING AN ETHYLENE POLYAMINE WHEREIN A LIQUID MIXTURE OF ETHYLENE DICHLORIDE AND AN AQUEOUS SOLUTION OF AMMONIA IS REACTED BY HEATING THE SAME TO A REACTION TEMPERATURE UNDER PRESSURE, THE STEP WHICH CONSISTS IN FEEDING TO THE REACTION AT LEAST 0.05 MOLE OF DIETHYLENETRIAMINE PER MOLE OF THE ETHYLENE DICHLORIDE STARTING MATERIAL.
Claim 2
Dependent Claim
56 words
IN A PROCESS FOR MAKING AN ETHYLENE POLYAMINE WHEREIN A LIQUID MIXTURE OF ETHYLENE DICHLORIDE AND AN AQUEOUS SOLUTION OF AMMONIA IS REACTED BY HEATING THE SAME TO A REACTION TEMPERATURE UNDER PRESSURE, THE STEP WHICH CONSISTS IN FEEDING TO THE REACTION AT LEAST 0.05 MOLE OF DIETHYLENETRIAMINE PER MOLE OF THE ETHYLENE DICHLORIDE STARTING MATERIAL.
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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |