Patent US2518697A successfully refreshed from Google Patents.
US2518697A
Expired / Lapsed
US
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Helicopter with antitorque tail jet
Assignee: RTX Corp
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Filing: 1944-10-30
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Granted: 1950-08-15
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Expires: 1964-10-30
Abstract
No abstract record available.
Inventors
- 👤 John G Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:16
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/82; B64C2027/8245
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR403730A
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US1572812A
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US1909450A
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US1623613A
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US1642752A
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FR687482A
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US1922167A
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FR818703A
Cited
US2177499A
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US2135073A
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FR883462A
Cited
US2318259A
Cited
US2369652A
Cited
US2390161A
Cited
GB556866A
Cited
US2503172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |