Patent US4041909A successfully refreshed from Google Patents.
US2933271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Landing gear for helicopters
Assignee: Menasco Manufacturing Co
•
Filing: 1954-07-09
•
Granted: 1960-04-19
•
Expires: 1974-07-09
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Maltby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:38
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/001; B64C2025/008
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1780531A
Cited
US1918697A
Cited
US1918426A
Cited
US2139192A
Cited
FR819026A
Cited
US2278081A
Cited
US2365387A
Cited
US2563194A
Cited
GB618914A
Cited
US2679827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |