Patent US3733368A successfully refreshed from Google Patents.
US3733368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of polymers from a recycle stream that contains ethylene
Assignee: Shell USA Inc
•
Filing: 1971-07-02
•
Granted: 1973-05-15
•
Expires: 1991-07-02
Abstract
Abstract CONTAMINATING QUANTITIES OF C4+ HYDROCARBON POLYMERS ARE REMOVED FROM RECYCLE ETHYLENE IN THE PROCESS FOR CATALYTIC HYDRATION OF ETHYLENE BY (A) WASHING AT LEAST A PORTION OF THE TOTAL GASEOUS RECYCLE STREAM WITH AN AQUEOUS ABSORBANT IN A FIRST SCRUBBING ZONE TO PRODUCE A POLYMER-RICH ETHYLENE OVERHEAD, AND (B) SCRUBBING THE POLYMER-RICH ETHYLENE WITH A LEAN, HEAVY HYDROCARBON ABSORBANT IN A SECOND SCRUBBING ZONE TO PRODUCE AN ETHYLENE OVERHEAT SUBSTANTIALLY FREE OF POLYMERS.
Inventors
- 👤 Delwin Earl Dodd
- 👤 Kuei-Jung Li
- 👤 Robert Alexander Golding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:10
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/11
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 |