US2497308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ethyleneurea
Assignee: EIDP Inc
•
Filing: 1944-03-01
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Granted: 1950-02-14
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Expires: 1964-03-01
Abstract
No abstract record available.
Inventors
- 👤 Alfred T Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:56
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/28; C07D233/30; C07D233/32; C07D233/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A PROCESS FOR THE PREPARATION OF ETHYLENUREA WHICH COMPRISES SUBJECTING CARBON DIOXIDE AND ETHYLENE DIAMINE TO A REACTION AT A TEMPERATURE BETWEEN 175 AND 300*C. AND AT A PRESSURE OF AT LEAST 10 ATMOSPHRERES.
Claim 2
Dependent Claim
34 words
A PROCESS FOR THE PREPARATION OF ETHYLENUREA WHICH COMPRISES SUBJECTING CARBON DIOXIDE AND ETHYLENE DIAMINE TO A REACTION AT A TEMPERATURE BETWEEN 175 AND 300*C. AND AT A PRESSURE OF AT LEAST 10 ATMOSPHRERES.
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) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |