US2457255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stripping of spent catalyst in a hydrocarbon conversion process
Assignee: Standard Oil Co
•
Filing: 1945-04-20
•
Granted: 1948-12-28
•
Expires: 1965-04-20
Abstract
No abstract record available.
Inventors
- 👤 Paul F Mcelherne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:06
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2320273A
Cited
US2311564A
Cited
US2273076A
Cited
US2382472A
Cited
US2391944A
Cited
US2408943A
Cited
US2385326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |