Patent US2933270A successfully refreshed from Google Patents.
US2933270A
Expired / Lapsed
US
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Landing gear for helicopters
Assignee: Menasco Manufacturing Co
•
Filing: 1954-06-04
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Granted: 1960-04-19
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Expires: 1974-06-04
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Maltby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:01
CPC Classifications
B; B64; B64C; B64C25/00; B64C25/32; B64C25/34; B64C25/001; B64C2025/008; B64C2025/325
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2100445A
Cited
FR819026A
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FR829039A
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GB544493A
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US2347959A
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US2316682A
Cited
US2599690A
Cited
US2520266A
Cited
GB618914A
Cited
US2630989A
Cited
DE818734C
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 |