US2993908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of cyclic alkylene carbonates
Assignee: Pure Oil Co
•
Filing: 1958-12-16
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Granted: 1961-07-25
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Expires: 1978-12-16
Abstract
No abstract record available.
Inventors
- 👤 Allen F Millikan
- 👤 Gifford W Crosby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:05
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/10; C07D317/32; C07D317/34; C07D317/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE PROCESS FOR PRODUCING ALKYLENE CARBONATES WHICH COMPRISES REACTING AN ALKYLENE OXIDE WITH CARBON DIOXIDE AT A TEMPERATURE OF ABOUT 200* TO 500*F. AND PRESSURES ABOVE ABOUT 100 P.S.I.G. IN THE PRESENCE OF A UREA SALT HAVING THE FORMULA:
Claim 2
Dependent Claim
39 words
THE PROCESS FOR PRODUCING ALKYLENE CARBONATES WHICH COMPRISES REACTING AN ALKYLENE OXIDE WITH CARBON DIOXIDE AT A TEMPERATURE OF ABOUT 200* TO 500*F. AND PRESSURES ABOVE ABOUT 100 P.S.I.G. IN THE PRESENCE OF A UREA SALT HAVING THE FORMULA:
References Cited (Backward Citations)
US2667497A
Cited
US2773070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |