Patent US2980365A successfully refreshed from Google Patents.
US2980365A
Expired / Lapsed
US
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Aircraft with rotary lifting airfoils
Assignee: Individual
•
Filing: 1958-12-05
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Granted: 1961-04-18
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Expires: 1978-12-05
Abstract
No abstract record available.
Inventors
- 👤 Lester N Yohe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:02
CPC Classifications
B; B64; B64U; B64U10/00; B64U10/60; B64U30/00; B64U30/20; B64U30/26; B64U10/10; B64U10/13; B64U10/14; B64U2101/00; B64U2101/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1036122A
Cited
US1057225A
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US1191501A
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US1482690A
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US1389925A
Cited
DE750975C
Cited
DE944102C
Cited
US2876965A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |