US2601258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter with jet-operated rotor
Assignee: STEFAN CZARNECKI
•
Filing: 1945-11-28
•
Granted: 1952-06-24
•
Expires: 1965-11-28
Abstract
No abstract record available.
Inventors
- 👤 Brzozowski Witold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:56
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/16; B64C27/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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GB227151A
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FR648107A
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GB275677A
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GB366450A
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US1932702A
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US2142601A
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US2092077A
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US2330056A
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FR859640A
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US2370181A
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US2371687A
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US2397357A
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GB556866A
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US2429646A
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US2457936A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-24 | 1955-12-24 | 1956-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-24 | 1959-12-24 | 1960-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-24 | 1963-12-24 | 1964-06-24 | $7700.00 | Window Closed / Lapsed |