US3420472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter having in horizontal flight the characteristics of an airplane
Assignee: Individual
•
Filing: 1967-02-20
•
Granted: 1969-01-07
•
Expires: 1987-02-20
Abstract
No abstract record available.
Inventors
- 👤 Jacques Boudes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:39
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/38; B; B64; B64C; B64C29/00; B64C29/0091; B64C29/02; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |