Patent US3784620A successfully refreshed from Google Patents.
US3784620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of styrene from ethylbenzene
Assignee: Monsanto Co
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Filing: 1972-12-14
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Granted: 1974-01-08
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Expires: 1992-12-14
Abstract
Abstract WHEREIN R AND R'' ARE AROMATIC OR ALIPHATIC. EXEMPLARY OF THE POLYAMIDES ARE NYLON-6 AND NYLON 6, 10. -(NH-R-NH-CO-R-CO)A- AND -(NH-R-CO)A- STYRENE IS SEPARATED FROM ORGANIC MIXTURE COMPRISING STYRENE AND ETHYLBENZENE BY CONTACTING THE SAID MIXTURE UNDER PERVAPORATION PERMEATION CONDITIONS AGAINST ONE SIDE OF A POLYAMIDE PERMEATION MEMBRANE AND WITHDRAWING ON THE OTHER SIDE OF THE MEMBRANE A VAPOROUS MIXTURE HAVING AN INCREASED CONCENTRATION OF STYRENE. THE POLYAMIDES HAVE UNITS SELECTED FROM THE GROUP CONSISTING OF
Inventors
- 👤 E Perry
- 👤 W Strazik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:25
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D71/00; B01D71/06; B01D71/56; C; C07; C07C; C07C7/00; C07C7/144
Claims Analysis
Total Claims: 0
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |