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US2589030A
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Helicopter rotor system
Assignee: Individual
•
Filing: 1949-04-26
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Granted: 1952-03-11
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Expires: 1969-04-26
Abstract
No abstract record available.
Inventors
- 👤 Alde Murray William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:25
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1294361A
Cited
US1189680A
Cited
CH198878A
Cited
GB538621A
Cited
US2434276A
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US2404014A
Cited
US2437165A
Cited
US2481748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-03-11 | 1955-09-10 | 1956-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-03-11 | 1959-09-10 | 1960-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-03-11 | 1963-09-10 | 1964-03-11 | $7700.00 | Window Closed / Lapsed |