US2997257A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aircraft with vertical lift engines and deflecting intakes therefor
Assignee: Rolls Royce PLC
•
Filing: 1960-01-05
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Granted: 1961-08-22
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Expires: 1980-01-05
Abstract
No abstract record available.
Inventors
- 👤 Kerry Thomas Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:25
CPC Classifications
B; B64; B64C; B64C29/00; B64C29/0008; B64C29/0041; B64C29/0058
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR24412E
Cited
US2936969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |