US3341583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthesis of symmetrical ureas
Assignee: Signal Oil and Gas Co
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Filing: 1964-05-04
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Granted: 1967-09-12
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Expires: 1984-05-04
Abstract
No abstract record available.
Inventors
- 👤 John E Anderson
- 👤 Clyde E Parish
- 👤 George H Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:04
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1809
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
AN IMPROVED METHOD OF PREPARING UREAS COMPRISING TREATING AN ADDUCT CONSISTING OF CARBONYL SULFIDE AND A NITROGEN COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA, A PRIMARY AMINE AND A SECONDARY AMINE, SAID ADDUCT HAVING A MOLECULAR RATIO OF CARBONYL SULFIDE TO NITROGEN COMPOUND OF 1:2, IN AN INERT LIQUID MEDIUM WITH MOLECULAR OXYGEN AND FROM ABOUT 1-5% BY WEIGHT OF SAID ADDUCT OF AN INORGANIC SALT OF A METAL WHICH READILY UNDERGOES A CHANGE IN VALENCE AT A TEMPERATURE BELOW THE HEAT DECOMPOSITION TEMPERATURE OF SAID ADDUCT, SAID TEMPERATURE BEING NOT MORE THAN ABOUT 60*C.
Claim 2
Dependent Claim
96 words
AN IMPROVED METHOD OF PREPARING UREAS COMPRISING TREATING AN ADDUCT CONSISTING OF CARBONYL SULFIDE AND A NITROGEN COMPOUND SELECTED FROM THE GROUP CONSISTING OF AMMONIA, A PRIMARY AMINE AND A SECONDARY AMINE, SAID ADDUCT HAVING A MOLECULAR RATIO OF CARBONYL SULFIDE TO NITROGEN COMPOUND OF 1:2, IN AN INERT LIQUID MEDIUM WITH MOLECULAR OXYGEN AND FROM ABOUT 1-5% BY WEIGHT OF SAID ADDUCT OF AN INORGANIC SALT OF A METAL WHICH READILY UNDERGOES A CHANGE IN VALENCE AT A TEMPERATURE BELOW THE HEAT DECOMPOSITION TEMPERATURE OF SAID ADDUCT, SAID TEMPERATURE BEING NOT MORE THAN ABOUT 60*C.
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) | 1970-09-11 | 1971-03-13 | 1971-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-11 | 1975-03-13 | 1975-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-11 | 1979-03-13 | 1979-09-12 | $7700.00 | Window Closed / Lapsed |