US2614637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air screw with automatic pitch mechanism
Assignee: Individual
•
Filing: 1948-03-26
•
Granted: 1952-10-21
•
Expires: 1968-03-26
Abstract
No abstract record available.
Inventors
- 👤 Landgraf Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:06
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/22; B64C27/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1405643A
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US1364755A
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US1857036A
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US1852500A
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US2054947A
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US2021999A
Cited
US2216162A
Cited
US2219288A
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US2233747A
Cited
US2359265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |