US3377383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing n, n-bis-(3-aminopropyl)-ethanolamine
Assignee: Air Products and Chemicals Inc
•
Filing: 1961-08-30
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Granted: 1968-04-09
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Expires: 1981-08-30
Abstract
No abstract record available.
Inventors
- 👤 Farkas Adalbert
- 👤 Miller Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:34
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G59/00; C08G59/18; C08G59/40; C08G59/62; C08G59/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
THE METHOD OF PREPARING N,N-BIS-(3-AMINOPROPYL) ETHANOLAMINE WHICH COMPRISES REACTING DI-(2-CYANOETHYL) ETHANOLAMINE WITH HYDROGEN AT TEMPERATURE ABOVE 30*C. AND BELOW ABOUT 80*C. IN THE PRESENCE OF (A) AMMONIA, (B) A HYDROGENATION CATALYST, AND (C) AN INERT SOLVENT,
Claim 2
Independent Claim
36 words
THE METHOD OF PREPARING N,N-BIS-(3-AMINOPROPYL) ETHANOLAMINE WHICH COMPRISES REACTING DI-(2-CYANOETHYL) ETHANOLAMINE WITH HYDROGEN AT TEMPERATURE ABOVE 30*C. AND BELOW ABOUT 80*C. IN THE PRESENCE OF (A) AMMONIA, (B) A HYDROGENATION CATALYST, AND (C) AN INERT SOLVENT,
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |