US3056457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch propeller
Assignee: Individual
•
Filing: 1961-03-03
•
Granted: 1962-10-02
•
Expires: 1981-03-03
Abstract
No abstract record available.
Inventors
- 👤 Macfarland Robin Adair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:20
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/06; B63H3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1777254A
Cited
DE518181C
Cited
US2355039A
Cited
US2353773A
Cited
US2433990A
Cited
US2703147A
Cited
US2844127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |