Patent US3308889A successfully refreshed from Google Patents.
US3308889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable pitch propeller with automatic adjustment
Assignee: FINN BERGISHAGEN
•
Filing: 1965-07-06
•
Granted: 1967-03-14
•
Expires: 1985-07-06
Abstract
No abstract record available.
Inventors
- 👤 Henrik G Langhjelm
- 👤 Gioia Charles J Di
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:44
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A VARIABLE PITCH PROPELLER COMPRISING AN AXIALLY EXTENDING HUB, A POWER SHAFT DISPOSED COAXIALLY WITHIN SAID HUB, SAID HUB HAVING AN INTERNAL AND AXIALLY ELONGATED EXTENSION AT WHICH SAID SHAFT IS DRIVINGLY CONNECTED THERETO, A PLURALITY OF PROPELLER BLADES JOURNALED BY SAID HUB ON AXES EACH IN A PLANE RADIAL TO THE HUB TO PERMIT ROTATION OF EACH BLADE TO VARY ITS PITCH ANGLE, AND RESILIENT MEANS IN SAID HUB FOR APPLYING BIASING TORQUE TO SAID BLADES ABOUT THE AXES THEREOF IN A DIRECTION TO URGE THE SAME TOWARD THEIR GREATEST PITCH ANGLE, SAID MEANS BEING RESPONSIVE TO ROTATIVE BLADE ADJUSTMENT IN THE OPPOSITE DIRECTION UNDER INCREASING FLUID PRESSURE LOAD ON THE BLADES
Claim 2
Dependent Claim
113 words
A VARIABLE PITCH PROPELLER COMPRISING AN AXIALLY EXTENDING HUB, A POWER SHAFT DISPOSED COAXIALLY WITHIN SAID HUB, SAID HUB HAVING AN INTERNAL AND AXIALLY ELONGATED EXTENSION AT WHICH SAID SHAFT IS DRIVINGLY CONNECTED THERETO, A PLURALITY OF PROPELLER BLADES JOURNALED BY SAID HUB ON AXES EACH IN A PLANE RADIAL TO THE HUB TO PERMIT ROTATION OF EACH BLADE TO VARY ITS PITCH ANGLE, AND RESILIENT MEANS IN SAID HUB FOR APPLYING BIASING TORQUE TO SAID BLADES ABOUT THE AXES THEREOF IN A DIRECTION TO URGE THE SAME TOWARD THEIR GREATEST PITCH ANGLE, SAID MEANS BEING RESPONSIVE TO ROTATIVE BLADE ADJUSTMENT IN THE OPPOSITE DIRECTION UNDER INCREASING FLUID PRESSURE LOAD ON THE BLADES
References Cited (Backward Citations)
NL36986C
Cited
FR24707E
Cited
FR614716A
Cited
US1750778A
Cited
US1851874A
Cited
US2097643A
Cited
US1931710A
Cited
US2440046A
Cited
US3054458A
Cited
US3145780A
Cited
US3204702A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |