Patent US2498538A successfully refreshed from Google Patents.
US2498538A
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Synthetic manufacture of urea
Assignee: Compagnie de Produits Chimiques et Electrometallurgiques Alais Froges et Camargue
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Filing: 1947-07-22
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Granted: 1950-02-21
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Expires: 1967-07-22
Abstract
No abstract record available.
Inventors
- 👤 Frejacques Jean Leon Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:03
CPC Classifications
C; C07; C07C; C07C275/00; C07C275/04; C07C273/00; C07C273/02; C07C273/04; Y; Y02; Y02P; Y02P20/00; Y02P20/141
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
IN A PROCESS FOR THE SYNTHETIC MANUFACTURE OF UREA BY HEATING CARBON DIOXIDE WITH AMMONIA UNDER PRESSURE IN AN INERT VISCOUS LIQUID, THE STEP OF SEPARATELY INJECTING A HEAT ABSORBENT CONSISTING OF AN INERT VISCOUS HYDROCARBON LIQUID INTO THE REACTION ZONE, AT THE SAME TIME AS THE CARBON DIOXIDE AND AMMONIA, WHEREBY THE CARBAMATE FORMATION TAKES PLACE UNDER PRESSURE IN THE SAID ZONE AND IN THE PRESENCE OF THE SAID HEAT ABSORBENT HYDROCARBON LIQUID, AND WHEREBY THE REACTION TEMPERATURE IS REGULATED BY REGULATING THE QUANTITY OF HYDROCARBON LIQUID INJECTED.
Claim 2
Dependent Claim
89 words
IN A PROCESS FOR THE SYNTHETIC MANUFACTURE OF UREA BY HEATING CARBON DIOXIDE WITH AMMONIA UNDER PRESSURE IN AN INERT VISCOUS LIQUID, THE STEP OF SEPARATELY INJECTING A HEAT ABSORBENT CONSISTING OF AN INERT VISCOUS HYDROCARBON LIQUID INTO THE REACTION ZONE, AT THE SAME TIME AS THE CARBON DIOXIDE AND AMMONIA, WHEREBY THE CARBAMATE FORMATION TAKES PLACE UNDER PRESSURE IN THE SAID ZONE AND IN THE PRESENCE OF THE SAID HEAT ABSORBENT HYDROCARBON LIQUID, AND WHEREBY THE REACTION TEMPERATURE IS REGULATED BY REGULATING THE QUANTITY OF HYDROCARBON LIQUID INJECTED.
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) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |