US2615657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter engine-rotor support
Assignee: Bell Aircraft Corp
•
Filing: 1946-08-28
•
Granted: 1952-10-28
•
Expires: 1966-08-28
Abstract
No abstract record available.
Inventors
- 👤 Arthur M Young
- 👤 Kelley Bartram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:56
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/001; B64C2027/002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1491310A
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US2175999A
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US2175825A
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US2393141A
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US2395143A
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US2368334A
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US2418407A
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US2457340A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-28 | 1956-04-28 | 1956-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-28 | 1960-04-28 | 1960-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-28 | 1964-04-28 | 1964-10-28 | $7700.00 | Window Closed / Lapsed |