Patent US2472888A successfully refreshed from Google Patents.
US2472888A
Expired / Lapsed
US
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Apparatus for training pilots and other aircraft personnel
Assignee: International Business Machines Corp
•
Filing: 1945-02-21
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Granted: 1949-06-14
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Expires: 1965-02-21
Abstract
No abstract record available.
Inventors
- 👤 James M Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:25
CPC Classifications
F; F41; F41G; F41G9/00; F41G9/02; F41G9/025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2164412A
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US2292451A
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US2336711A
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US2366603A
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US2306429A
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US2307840A
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US2381872A
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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) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |