Patent US3183139A successfully refreshed from Google Patents.
Patent US2669505A successfully refreshed from Google Patents.
US2669505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contacting plate for liquid-liquid extraction tower
Assignee: Standard Oil Development Co
•
Filing: 1948-12-18
•
Granted: 1954-02-16
•
Expires: 1968-12-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Cyril O Rhys
- 👤 William E Stanton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:06
CPC Classifications
B; B01; B01D; B01D11/00; B01D11/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1868618A
Cited
US1951787A
Cited
US1943822A
Cited
US2011186A
Cited
US2009347A
Cited
US2274030A
Cited
US2271462A
Cited
US2400962A
Cited
US2400378A
Cited
US2460019A
Cited
US2615792A
Cited
US2609276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |