Patent US2923499A successfully refreshed from Google Patents.
US2923499A
Expired / Lapsed
US
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Anti-stall system for airplanes
Assignee: Individual
•
Filing: 1957-05-31
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Granted: 1960-02-02
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Expires: 1977-05-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth J Dinard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:22
CPC Classifications
B; B64; B64C; B64C13/00; B64C13/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1832159A
Cited
US1897285A
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US2297412A
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US2265524A
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US2630284A
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US2678177A
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US2798911A
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US2780686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |