Patent US3733367A successfully refreshed from Google Patents.
US3733367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of styrene from ethyl benzene
Assignee: Monsanto Co
•
Filing: 1972-03-08
•
Granted: 1973-05-15
•
Expires: 1992-03-08
Abstract
Abstract STYRENE IS SEPARATED FROM ORGANIC MIXTURES COMPRISING STYRENE AND ETHYLBENZENE BY CONTACTING THE MIXTURE AGAINST ONE SIDE OF A CYANOETHYL CELLULOSE MEMBRANE WITHDRAWING AT THE OTHER SIDE A VAPOROUS MIXTURE HAVING INCREASED STYRENE CONCENTRATION. THE CYANOETHYL CELLULOSE EMPLOYED PREFERABLY HAS A DEGREE OF SUBSTITUTION (D.S.) OF FROM ABOUT 0.5 TO 3.0.
Inventors
- 👤 E Perry
- 👤 W Strazik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:17
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/36; B01D61/362; B01D71/00; B01D71/06; B01D71/08; B01D71/10; C; C07; C07C; C07C7/00; C07C7/144
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |