US2559767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch propeller
Assignee: Stone J and Co Ltd
•
Filing: 1945-10-02
•
Granted: 1951-07-10
•
Expires: 1965-10-02
Abstract
No abstract record available.
Inventors
- 👤 Hatcher Ernest Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:13
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/02; B63H3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1174244A
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US1510436A
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AT123453B
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US1832493A
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US1832335A
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US1898659A
Cited
US2007417A
Cited
US2261915A
Cited
US2279633A
Cited
US2285050A
Cited
US2368191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |