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Patent US2642946A successfully refreshed from Google Patents.
US2642946A
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Reversible propeller
Assignee: Vinters Armstrongs Ltd
•
Filing: 1947-07-30
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Granted: 1953-06-23
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Expires: 1967-07-30
Abstract
No abstract record available.
Inventors
- 👤 Wood George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:37
CPC Classifications
B; B63; B63H; B63H3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1875598A
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US1898697A
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US1961671A
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US2423191A
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US2388276A
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US2378938A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |