Patent US2487239A successfully refreshed from Google Patents.
US2487239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propeller for aircraft
Assignee: Marquette Metal Products Co
•
Filing: 1943-02-19
•
Granted: 1949-11-08
•
Expires: 1963-02-19
Abstract
No abstract record available.
Inventors
- 👤 Gordon W Hardy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:45
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/32; B64C11/34; B64C11/343
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1203557A
Cited
GB230162A
Cited
US1690034A
Cited
US1964102A
Cited
US1776650A
Cited
US1851874A
Cited
US1833843A
Cited
US1875598A
Cited
US1936677A
Cited
US1857392A
Cited
US1915465A
Cited
US2144007A
Cited
US1985041A
Cited
FR772115A
Cited
US2138339A
Cited
US2164489A
Cited
US2223081A
Cited
US2248590A
Cited
US2197814A
Cited
US2315213A
Cited
US2276347A
Cited
US2346007A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-07 | 1953-05-09 | 1953-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-07 | 1957-05-09 | 1957-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-07 | 1961-05-09 | 1961-11-08 | $7700.00 | Window Closed / Lapsed |