US2589826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epicyclic helicopter rotor system
Assignee: Glenn L Martin Co
•
Filing: 1949-05-26
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Granted: 1952-03-18
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Expires: 1969-05-26
Abstract
No abstract record available.
Inventors
- 👤 Agnew E Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:59
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US153314A
Cited
FR366150A
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DE581610C
Cited
US1797713A
Cited
DE586411C
Cited
US1892036A
Cited
US1922167A
Cited
FR826798A
Cited
US2366321A
Cited
US2472947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-18 | 1955-09-17 | 1956-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-18 | 1959-09-17 | 1960-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-18 | 1963-09-17 | 1964-03-18 | $7700.00 | Window Closed / Lapsed |