US3429527A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical take-off winged aircraft structure and method
Assignee: De Havilland Aircraft of Canada Ltd
•
Filing: 1966-01-19
•
Granted: 1969-02-25
•
Expires: 1986-01-19
Abstract
No abstract record available.
Inventors
- 👤 Donald Charles Whittley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:53
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0041; B64C23/00; B64C23/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2918233A
Cited
US3062483A
Cited
US2974904A
Cited
US3117643A
Cited
US3085770A
Cited
US3259341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |