Patent US2549313A successfully refreshed from Google Patents.
US2549313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Changeable pitch propeller
Assignee: Individual
•
Filing: 1948-11-01
•
Granted: 1951-04-17
•
Expires: 1968-11-01
Abstract
No abstract record available.
Inventors
- 👤 Grant W Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:56
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/54; B64C27/58; B64C27/59; B64C27/605
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1852499A
Cited
US1837318A
Cited
US1973598A
Cited
US2137952A
Cited
US2256635A
Cited
US2444070A
Cited
US2402349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |