US3024280A
Expired / Lapsed
US
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Process and apparatus for the production of urea
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1958-05-14
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Granted: 1962-03-06
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Expires: 1978-05-14
Abstract
No abstract record available.
Inventors
- 👤 Braun Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:35
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/02; C07C273/04; Y; Y02; Y02P; Y02P20/00; Y02P20/141
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
A PROCESS FOR THE CONTINUOUS PRODUCTION OF UREA BY REACTION OF SUBSTANTIALLY STOICHIOMETERIC AMOUNTS OF TWO COMPONENTS CONSISTING OF CARBON DIOXIDE AND AMMONIA AT PRESSURE OF 100-300 ATMOSPHERES AND AT A TEMPERATURES OF 160-240* C. IN A REACTOR, WHICH CONSISTS OF FEEDING SAID AMMONIA CONTINUOUSLY INTO SAID REACTOR AT AN ENTRANCE TEMPERATURE OF -30 TO 40* C., ADDING THERETO APPROXIMATELY 40 PERCENT OF THE STOICHIOMETRIC AMOUNT OF SAID CARBON DIOXIDE, ADDING THE REMAINING CARBON DIOXIDE IN EQUAL PORTIONS OF APPROXIMATELY 33/4 PERCENT OF THE TOTAL AND IN DIFFERENT ZONES OF SAID REACTOR, AND CONTINUING THE REACTION AT SAID TEMPERATURES AND PRESSURES.
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) | 1965-03-05 | 1965-09-04 | 1966-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-05 | 1969-09-04 | 1970-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-05 | 1973-09-04 | 1974-03-06 | $7700.00 | Window Closed / Lapsed |