Patent US3163231A successfully refreshed from Google Patents.
US3163231A
Expired / Lapsed
US
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Two-part pitch changing mechanism
Assignee: RTX Corp
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Filing: 1963-04-29
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Granted: 1964-12-29
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Expires: 1983-04-29
Abstract
No abstract record available.
Inventors
- 👤 Philip E Barnes
- 👤 Seppo J Viikinsalo
- 👤 Richard B Pitbladdo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:28
CPC Classifications
B; B64; B64C; B64C11/00; B64C11/30; B64C11/306; B64C11/308
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
IN COMBINATION WITH A PROPELLER HAVING TWO AXIALLY SPACED BLADE PARTS MOUNTED IN THE SAME HUB, A FIRST HYDRAULICALLY ACTUATED PISTON, PITCH CHANGING MECHANISM CONNECTING SAID PISTON WITH ONE OF SAID PARTS, A SECOND HYDRAULICALLY ACTUATED PISTON, PITCH CHANGING MECHANISM CONNECTING SAID SECOND PISTON WITH THE OTHER BLADE PART, A CYLINDER IN SAID FIRST PISTON RECEIVING SAID SECOND PISTON, STOPS LIMITING MOVEMENT OF SAID SECOND PISTON IN SAID CYLINDER, AND VALVE MECHANISM CONTROLLED BY SAID FIRST PISTON, CONTROLLING HYDRAULIC FLUID IN SAID CYLINDER.
Claim 2
Dependent Claim
83 words
IN COMBINATION WITH A PROPELLER HAVING TWO AXIALLY SPACED BLADE PARTS MOUNTED IN THE SAME HUB, A FIRST HYDRAULICALLY ACTUATED PISTON, PITCH CHANGING MECHANISM CONNECTING SAID PISTON WITH ONE OF SAID PARTS, A SECOND HYDRAULICALLY ACTUATED PISTON, PITCH CHANGING MECHANISM CONNECTING SAID SECOND PISTON WITH THE OTHER BLADE PART, A CYLINDER IN SAID FIRST PISTON RECEIVING SAID SECOND PISTON, STOPS LIMITING MOVEMENT OF SAID SECOND PISTON IN SAID CYLINDER, AND VALVE MECHANISM CONTROLLED BY SAID FIRST PISTON, CONTROLLING HYDRAULIC FLUID IN SAID CYLINDER.
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) | 1967-12-29 | 1968-06-29 | 1968-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-29 | 1972-06-29 | 1972-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-29 | 1976-06-29 | 1976-12-29 | $7700.00 | Window Closed / Lapsed |