US2961051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotor hub and drive system
Assignee: Individual
•
Filing: 1955-11-17
•
Granted: 1960-11-22
•
Expires: 1975-11-17
Abstract
No abstract record available.
Inventors
- 👤 Wilford Edward Burke
- 👤 Jr Harold E Lemont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:29
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/37; B64C27/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2067633A
Cited
US2648387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |