US2497309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of ethyleneurea
Assignee: EIDP Inc
•
Filing: 1944-05-04
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Granted: 1950-02-14
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Expires: 1964-05-04
Abstract
No abstract record available.
Inventors
- 👤 Alfred T Larson
- 👤 Arthur G Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:51
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
96 words
A CONTINUOUS CYCLICAL PROCESS FOR THE PREPARATION OF ETHYLENUREA WHICH COMPRISES CONTINUOUSLY INTRODUCING ETHYLENEDIAMINE, CONTAINING FROM 10 TO 50% WATER, AND CARBON DIOXIDE INTO A REACTION ZONE, SUBJECTING THE RESULTING MIXTURE THEREIN TO A TEMPERATURE BETWEEN 200 AND 300*C. AND A PRESSURE ABOVE 10 ATMOSPHERES, CONTINUOUSLY DISCHARGING THE PRODUCTS FROM THE REACTION ZONE, SEPARATING THE ETHYLENEUREA FROM THE WATER, THE UNREACTED ETHYLENEDIAMINE AND CARBON DIOXIDE AND RETURNING THE UNREACTED ETHYLENEDIAMINE AND CARBON DIOXIDE, ADDING MORE CARBON DIOXIDE AND THE AMOUNT OF ETHYLENEDIAMINE CONSUMED IN THE CYCLE THERETO AND PASSING THE RESULTING MIXTURE INTO THE REACTION ZONE.
Claim 2
Dependent Claim
96 words
A CONTINUOUS CYCLICAL PROCESS FOR THE PREPARATION OF ETHYLENUREA WHICH COMPRISES CONTINUOUSLY INTRODUCING ETHYLENEDIAMINE, CONTAINING FROM 10 TO 50% WATER, AND CARBON DIOXIDE INTO A REACTION ZONE, SUBJECTING THE RESULTING MIXTURE THEREIN TO A TEMPERATURE BETWEEN 200 AND 300*C. AND A PRESSURE ABOVE 10 ATMOSPHERES, CONTINUOUSLY DISCHARGING THE PRODUCTS FROM THE REACTION ZONE, SEPARATING THE ETHYLENEUREA FROM THE WATER, THE UNREACTED ETHYLENEDIAMINE AND CARBON DIOXIDE AND RETURNING THE UNREACTED ETHYLENEDIAMINE AND CARBON DIOXIDE, ADDING MORE CARBON DIOXIDE AND THE AMOUNT OF ETHYLENEDIAMINE CONSUMED IN THE CYCLE THERETO AND PASSING THE RESULTING MIXTURE INTO THE REACTION ZONE.
References Cited (Backward Citations)
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US1307570A
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US1816087A
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US2212847A
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US1785730A
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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) | 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 |