US2761664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple rotor head mounting for mining machine
Assignee: Westinghouse Air Brake Co
•
Filing: 1953-07-21
•
Granted: 1956-09-04
•
Expires: 1973-07-21
Abstract
No abstract record available.
Inventors
- 👤 Bowman Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:31
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US504179A
Cited
US674415A
Cited
US1357510A
Cited
US1984373A
Cited
US2379137A
Cited
US2415205A
Cited
US2675996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |