US2638579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stall warning apparatus for airplanes
Assignee: Westinghouse Electric Corp
•
Filing: 1948-06-01
•
Granted: 1953-05-12
•
Expires: 1968-06-01
Abstract
No abstract record available.
Inventors
- 👤 Jr Howard E Dyche
- 👤 Gilbert P Cardwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:12
CPC Classifications
B; B64; B64D; B64D43/00; B64D43/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE23042E
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US1615677A
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US1997011A
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US2057384A
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US2116960A
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US2297412A
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US2373088A
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US2356847A
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US2385616A
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US2450450A
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US2454587A
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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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |