US2456707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for stripping spent fluid catalysts
Assignee: Hydrocarbon Research Inc
•
Filing: 1944-08-17
•
Granted: 1948-12-21
•
Expires: 1964-08-17
Abstract
No abstract record available.
Inventors
- 👤 Percival C Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:05
CPC Classifications
B; B01; B01J; B01J38/00; B01J38/04; B01J38/12
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB543838A
Cited
US2377512A
Cited
US2320273A
Cited
US2311564A
Cited
US2273076A
Cited
US2302209A
Cited
US2341193A
Cited
US2394814A
Cited
US2378342A
Cited
US2388055A
Cited
US2391434A
Cited
US2374151A
Cited
US2391944A
Cited
US2391344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |