US2667497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of cyclic carbonates
Assignee: Mathieson Chemical Corp
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Filing: 1951-12-12
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Granted: 1954-01-26
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Expires: 1971-12-12
Abstract
No abstract record available.
Inventors
- 👤 Warren K Cline
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:56
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
81 words
A PROCESS FOR MANUFACTURING AN ALKYLENE CARBONATE WHICH COMPRISES REACTING CARBON DIOXIDE WITH A LOWER ALKYLENE OXIDE AT ABOUT 150* TO 250* C. AND UNDER A PRESSURE OF ABOUT 500 TO 2000 POUNDS PER SQUARE INCH PRESSURE IN THE PRESENCE OF A SOLID CATALYST CONSISTING OF A HALIDES, BROMIDES FROM THE GROUP CONSISTING OF CHLORIDES, BROMIDES AND IODIDES OF AN ALKALINE EARTH METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM AND RECOVERING THE ALKYLENE CARBONATE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
81 words
A PROCESS FOR MANUFACTURING AN ALKYLENE CARBONATE WHICH COMPRISES REACTING CARBON DIOXIDE WITH A LOWER ALKYLENE OXIDE AT ABOUT 150* TO 250* C. AND UNDER A PRESSURE OF ABOUT 500 TO 2000 POUNDS PER SQUARE INCH PRESSURE IN THE PRESENCE OF A SOLID CATALYST CONSISTING OF A HALIDES, BROMIDES FROM THE GROUP CONSISTING OF CHLORIDES, BROMIDES AND IODIDES OF AN ALKALINE EARTH METAL SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM AND RECOVERING THE ALKYLENE CARBONATE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
DE740366C
Cited
US2518058A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-25 | 1957-07-27 | 1958-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-25 | 1961-07-27 | 1962-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-25 | 1965-07-27 | 1966-01-26 | $7700.00 | Window Closed / Lapsed |