US2961052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system for helicopters
Assignee: Unisys Corp
•
Filing: 1958-06-03
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Granted: 1960-11-22
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Expires: 1978-06-03
Abstract
No abstract record available.
Inventors
- 👤 Harry D Smith
- 👤 Robert C Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:23
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; G; G05; G05D; G05D1/00; G05D1/08; G05D1/0808; G05D1/0858; H; H02; H02P; H02P23/00; H02P23/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |