US2857431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous process for making urea
Assignee: Monsanto Chemicals Ltd
•
Filing: 1955-04-29
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Granted: 1958-10-21
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Expires: 1975-04-29
Abstract
No abstract record available.
Inventors
- 👤 King I Glass
- 👤 Richard L Meek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:12
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; Y; Y02; Y02P; Y02P20/00; Y02P20/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
IN A CONTINUOUS PROCESS FOR THE PRODUCTION OF UREA WHEREIN CARBON MONOXIDE IS CONTINUOUSLY REACTED IN A REACTION ZONE WITH A MIXTURE OF AMMONIA AND SULFUR CONTAINED IN AN INERT SOLVENT, A REACTION PRODUCT MIXTURE CONTAINING UREA, AMMONIA, SAID INERT SOLVENT AND A PORTION OF THE HYDROGEN SULFIDE FORMED IN THE REACTION CONTINUOUSLY REMOVED FROM THE REACTION ZONE AND UREA RECOVERED FROM SAID REACTION PRODUCT MIXTURE, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY COUNTERCURRENTLY REACTING CARBON MONOXIDE WITH SAID MIXTURE OF AMMONIA AND SULFUR CONTAINED IN AN INERT SOLVENT.
Claim 2
Dependent Claim
87 words
IN A CONTINUOUS PROCESS FOR THE PRODUCTION OF UREA WHEREIN CARBON MONOXIDE IS CONTINUOUSLY REACTED IN A REACTION ZONE WITH A MIXTURE OF AMMONIA AND SULFUR CONTAINED IN AN INERT SOLVENT, A REACTION PRODUCT MIXTURE CONTAINING UREA, AMMONIA, SAID INERT SOLVENT AND A PORTION OF THE HYDROGEN SULFIDE FORMED IN THE REACTION CONTINUOUSLY REMOVED FROM THE REACTION ZONE AND UREA RECOVERED FROM SAID REACTION PRODUCT MIXTURE, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY COUNTERCURRENTLY REACTING CARBON MONOXIDE WITH SAID MIXTURE OF AMMONIA AND SULFUR CONTAINED IN AN INERT SOLVENT.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |