Patent US2961778A successfully refreshed from Google Patents.
US2961778A
Expired / Lapsed
US
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Helicopter flight simulation and pilot training device
Assignee: Bell Aerospace Corp
•
Filing: 1955-09-30
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Granted: 1960-11-29
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Expires: 1975-09-30
Abstract
No abstract record available.
Inventors
- 👤 Florez Luis De
- 👤 Jr Edwin K Smith
- 👤 Jr Clarence P Andrade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:03
CPC Classifications
G; G09; G09B; G09B9/00; G09B9/02; G09B9/08; G09B9/46
Claims Analysis
Total Claims: 0
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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) | 1963-11-29 | 1964-05-30 | 1964-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-29 | 1968-05-30 | 1968-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-29 | 1972-05-30 | 1972-11-29 | $7700.00 | Window Closed / Lapsed |