US2805491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control system for catalyst elevator
Assignee: California Research LLC
•
Filing: 1955-01-04
•
Granted: 1957-09-10
•
Expires: 1975-01-04
Abstract
No abstract record available.
Inventors
- 👤 Ludwig Milton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:22
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/10; B01J8/001
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US864186A
Cited
US1502186A
Cited
US1738890A
Cited
US1844782A
Cited
US2275442A
Cited
US2331938A
Cited
US2409376A
Cited
US2531192A
Cited
US2471398A
Cited
US2490774A
Cited
US2676095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-09 | 1961-03-11 | 1961-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-09 | 1965-03-11 | 1965-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-09 | 1969-03-11 | 1969-09-10 | $7700.00 | Window Closed / Lapsed |