Patent US3496069A successfully refreshed from Google Patents.
US3496069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of unsaturated hydrocarbons by extractive distillation with recycle of stripper overhead
Assignee: Texas Petrochemicals Corp
•
Filing: 1967-11-09
•
Granted: 1970-02-17
•
Expires: 1987-11-09
Abstract
No abstract record available.
Inventors
- 👤 Lloyd D Tschopp
- 👤 Rudolph C Woerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:19
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3000794A
Cited
US3242227A
Cited
US3230157A
Cited
US3320138A
Cited
US3317627A
Cited
US3293316A
Cited
US3436438A
Cited
US3436436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |