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Patent US3521838A successfully refreshed from Google Patents.
US3521838A
Expired / Lapsed
US
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Control apparatus for vtol craft
Assignee: Honeywell Inc
•
Filing: 1967-08-09
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Granted: 1970-07-28
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Expires: 1987-08-09
Abstract
No abstract record available.
Inventors
- 👤 Robert S Buffum
- 👤 John C Dendy
- 👤 Wilburn T Robertson
- 👤 Everett R Tribken
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0061; G05D1/08; G05D1/0808; G05D1/0816
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3132828A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |