US2609053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shrouded tail rotor
Assignee: RTX Corp
•
Filing: 1946-10-31
•
Granted: 1952-09-02
•
Expires: 1966-10-31
Abstract
No abstract record available.
Inventors
- 👤 John G Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:54
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/82; B64C2027/8254; B64C2027/8263; B64C2027/8272
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190911090A
Cited
US1971734A
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US2123657A
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US2322715A
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US2369652A
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US2475022A
Cited
GB572417A
Cited
US2378617A
Cited
US2385889A
Cited
US2415622A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-09-02 | 1956-03-03 | 1956-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-02 | 1960-03-03 | 1960-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-02 | 1964-03-03 | 1964-09-02 | $7700.00 | Window Closed / Lapsed |