US3018228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation process
Assignee: Monsanto Chemicals Ltd
•
Filing: 1958-08-04
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Granted: 1962-01-23
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Expires: 1978-08-04
Abstract
No abstract record available.
Inventors
- 👤 Cornell David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:48
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
THE METHOD OF SEPARATING STYRENE AND ETHYLBENZENE FROM A CRUDE HYDROCARBON FRACTION CONTAINING THE SAME WHICH COMPRISES SUBJECTING SUCH CRUDE MIXTURE TO EXTRACTIVE DISTILLATION IN THE PRESENCE OF ETHYLENE CARBONATE, WITHDRAWING A VAPOR FRACTION COMPRISING ETHYLBENZENE, AND A LIQUID FRACTION COMPRISING THE SAID ETHYLENE CARBONATE CONTAINING STYRENE, AND STRIPPING THE STYRENE FROM THE SAID ETHYLENE CARBONATE.
Claim 2
Independent Claim
56 words
THE METHOD OF SEPARATING STYRENE AND ETHYLBENZENE FROM A CRUDE HYDROCARBON FRACTION CONTAINING THE SAME WHICH COMPRISES SUBJECTING SUCH CRUDE MIXTURE TO EXTRACTIVE DISTILLATION IN THE PRESENCE OF ETHYLENE CARBONATE, WITHDRAWING A VAPOR FRACTION COMPRISING ETHYLBENZENE, AND A LIQUID FRACTION COMPRISING THE SAID ETHYLENE CARBONATE CONTAINING STYRENE, AND STRIPPING THE STYRENE FROM THE SAID ETHYLENE CARBONATE.
References Cited (Backward Citations)
US2688645A
Cited
US2837585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-01-22 | 1965-07-24 | 1966-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-22 | 1969-07-24 | 1970-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-22 | 1973-07-24 | 1974-01-23 | $7700.00 | Window Closed / Lapsed |