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US2434276A
Expired / Lapsed
US
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Tiltable counter-rotating rotor system for helicopters and control means therefor
Assignee: Individual
•
Filing: 1943-01-06
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Granted: 1948-01-13
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Expires: 1963-01-06
Abstract
No abstract record available.
Inventors
- 👤 Isidor B Laskowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:27
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1014643A
Cited
US1055533A
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US1578833A
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US1718577A
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US1788218A
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US1957813A
Cited
US2172334A
Cited
US2352342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-01-12 | 1951-07-14 | 1952-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-01-12 | 1955-07-14 | 1956-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-01-12 | 1959-07-14 | 1960-01-13 | $7700.00 | Window Closed / Lapsed |