US3409248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary winged aircraft with drag propelling rotors and controls
Assignee: HARVARD J BRYAN
•
Filing: 1965-10-22
•
Granted: 1968-11-05
•
Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Harvard J Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0016; B64C29/0025
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1973017A
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US2462459A
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US2668595A
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US2825514A
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US2845132A
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US2918978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-11-05 | 1972-05-06 | 1972-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-05 | 1976-05-06 | 1976-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-05 | 1980-05-06 | 1980-11-05 | $7700.00 | Window Closed / Lapsed |