US2874149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ureas
Assignee: Monsanto Chemicals Ltd
•
Filing: 1957-03-18
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Granted: 1959-02-17
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Expires: 1977-03-18
Abstract
No abstract record available.
Inventors
- 👤 Applegath Fred
- 👤 Raymond A Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:15
CPC Classifications
C; C07; C07D; C07D239/00; C07D239/02; C07D239/06; C07D239/08; C07D239/10; C07D235/00; C07D235/02; C07D235/04; C07D235/24; C07D235/26; C07D243/00; C07D243/04; C07D245/00; C07D245/02; C08; C08L; C08L75/00; C08L75/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR PREPARING CYCLIC AND POLYMERIC UREAS WHICH COMPRISES MIXTURE CARBON MONOXIDE, SULFUR AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC COMPOUNDS CONTAINING AT LEAST TWO -NH2 SUBSTITUENT RADICALS ATTACHED TO DIFFERENT CARBON ATOMS AND ORGANIC COMPOUNDS CONTAINING AT LEAST ONE -NH2 SUBSTITUENT RADICAL AND AT LEAST ONE -NH- SUBSTITUENT RADICAL ATTACHED TO DIFFERENT CARBON ATOMS AND SUBJECTING THE RESULTANT MIXTURE TO A TEMPERATURE IN THE RANGE OF FROM ABOUT 60* C. TO ABOUT 300* C. AND A PRESSURE OF AT LEAST 30 P. S. I. A. FOR A TIME SUFFICIENT TO PRODUCE THE UREA
Claim 2
Dependent Claim
98 words
A PROCESS FOR PREPARING CYCLIC AND POLYMERIC UREAS WHICH COMPRISES MIXTURE CARBON MONOXIDE, SULFUR AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC COMPOUNDS CONTAINING AT LEAST TWO -NH2 SUBSTITUENT RADICALS ATTACHED TO DIFFERENT CARBON ATOMS AND ORGANIC COMPOUNDS CONTAINING AT LEAST ONE -NH2 SUBSTITUENT RADICAL AND AT LEAST ONE -NH- SUBSTITUENT RADICAL ATTACHED TO DIFFERENT CARBON ATOMS AND SUBJECTING THE RESULTANT MIXTURE TO A TEMPERATURE IN THE RANGE OF FROM ABOUT 60* C. TO ABOUT 300* C. AND A PRESSURE OF AT LEAST 30 P. S. I. A. FOR A TIME SUFFICIENT TO PRODUCE THE UREA
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) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |