US2600930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter control
Assignee: RTX Corp
•
Filing: 1946-09-24
•
Granted: 1952-06-17
•
Expires: 1966-09-24
Abstract
No abstract record available.
Inventors
- 👤 Igor I Sikorsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:05
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/04; B64C27/12; B64C27/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1409850A
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US1491310A
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FR637938A
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US1783011A
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GB317059A
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CH155974A
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US1879323A
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US2023105A
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US2233747A
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US2225002A
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US2317341A
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US2273303A
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US2385889A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-17 | 1955-12-17 | 1956-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-17 | 1959-12-17 | 1960-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-17 | 1963-12-17 | 1964-06-17 | $7700.00 | Window Closed / Lapsed |