Patent US2614637A successfully refreshed from Google Patents.
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 22:08
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/22; B64C27/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1405643A
Cited
US1364755A
Cited
US1857036A
Cited
US1852500A
Cited
US2054947A
Cited
US2021999A
Cited
US2216162A
Cited
US2219288A
Cited
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 |