Patent US2628434A successfully refreshed from Google Patents.
US2628434A
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Aircraft training apparatus with vertical air-speed indication and control
Assignee: Individual
•
Filing: 1946-05-25
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Granted: 1953-02-17
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Expires: 1966-05-25
Abstract
No abstract record available.
Inventors
- 👤 Dehmel Richard Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:57
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/16; G09B9/20; G09B9/206
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US502399A
Cited
US2040086A
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US2123142A
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US2126910A
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US2149756A
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US2244369A
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US2366603A
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US2450261A
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US2352953A
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US2428767A
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US2395477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |