US3672788A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch aerofoil blades
Assignee: Rolls Royce PLC
•
Filing: 1970-05-04
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Granted: 1972-06-27
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Expires: 1990-05-04
Abstract
Abstract VARIABLE PITCH AEROFOIL BLADES ARE PROVIDED WITH A GEAR DRIVE HAVING A FEEDBACK SO THAT WHEN THE MECHANISM REACHES AN EQUILIBRIUM (FEATHERED) CONDITION ANY DISTURBANCE AFFECTING THE BLADE CAUSES THE GEAR DRIVE TO ADJUST THE BLADES TO CANCEL THE EFFECT OF THE DISTRUBANCE.
Inventors
- 👤 John Henry Ellinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:06
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F02K3/06; F01; F01D; F01D7/00; F05; F05D; F05D2220/00; F05D2220/30; F05D2220/36; F05D2260/00; F05D2260/70; F05D2260/74; F05D2260/76; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |