Patent US2523216A successfully refreshed from Google Patents.
US2523216A
Expired / Lapsed
US
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Sustaining propeller for flying machines and parachutes
Assignee: Individual
•
Filing: 1946-11-16
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Granted: 1950-09-19
•
Expires: 1966-11-16
Abstract
No abstract record available.
Inventors
- 👤 Isacco Vittorio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:00
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE22595E
Cited
US905538A
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US1088250A
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GB191516788A
Cited
US1922866A
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US2110563A
Cited
US2056188A
Cited
US2108245A
Cited
US2231524A
Cited
US2278259A
Cited
US2261337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-18 | 1954-03-20 | 1954-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-18 | 1958-03-20 | 1958-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-18 | 1962-03-20 | 1962-09-19 | $7700.00 | Window Closed / Lapsed |