Patent US3302724A successfully refreshed from Google Patents.
US3302724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control apparatus for variable pitch propellers
Assignee: Westinghouse Air Brake Co
•
Filing: 1965-06-11
•
Granted: 1967-02-07
•
Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 Ralph C Brooks
- 👤 Paul E Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:58
CPC Classifications
B; B63; B63H; B63H3/00; B63H3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
AN AUTOMATIC CONTROL APPARATUS FOR VARIABLE PITCH PROPELLERS, COMPRISING: (A) MEANS FOR PROVIDING A FIRST PRESSURE SELECTIVELY VARIABLE IN MAGNITUDE, (B) MEANS RESPONSIVE TO SAID FIRST PRESSURE TO VARY THE PITCH OF A PROPELLER IN ACCORDANCE WITH THE MAGNITUDE OF SAID PRESSURE, (C) MEANS RESPONSIVE TO SAID FIRST PRESSURE FOR CONTROLLING THE SPEED OF AN ENGINE IN ACCORDANCE WITH THE MAGNITUDE OF SAID PRESSURE, (D) MEANS FOR PROVIDING A SECOND PRESSURE SELECTIVELY VARIABLE IN MAGNITUDE IN ACCORDANCE WITH THE ENGINE LOAD, AND (E) MEANS RESPONSIVE TO PRESSURE DIFFERENTIAL BETWEEN SAID FIRST PRESSURE AND SAID SECOND PRESSURE TO MODIFY THE EFFECT OF SAID FIRST PRESSURE UPON SAID PITCH VARYING MEANS TO INCREASE OR DECREASE THE PROPELLER PITCH DEPENDING UPON WHETHER SAID SECOND PRESSURE IS LESS THAN OR GREATER THAN, RESPECTIVELY, SAID FIRST PRESSURE AND UNTIL SAID FIRST PRESSURE AND SAID SECOND PRESSURE ASSUME A PREDETERMINED MINIMUM PRESSURE DIFFERENTIAL THEREBETWEEN.
Claim 2
Dependent Claim
148 words
AN AUTOMATIC CONTROL APPARATUS FOR VARIABLE PITCH PROPELLERS, COMPRISING: (A) MEANS FOR PROVIDING A FIRST PRESSURE SELECTIVELY VARIABLE IN MAGNITUDE, (B) MEANS RESPONSIVE TO SAID FIRST PRESSURE TO VARY THE PITCH OF A PROPELLER IN ACCORDANCE WITH THE MAGNITUDE OF SAID PRESSURE, (C) MEANS RESPONSIVE TO SAID FIRST PRESSURE FOR CONTROLLING THE SPEED OF AN ENGINE IN ACCORDANCE WITH THE MAGNITUDE OF SAID PRESSURE, (D) MEANS FOR PROVIDING A SECOND PRESSURE SELECTIVELY VARIABLE IN MAGNITUDE IN ACCORDANCE WITH THE ENGINE LOAD, AND (E) MEANS RESPONSIVE TO PRESSURE DIFFERENTIAL BETWEEN SAID FIRST PRESSURE AND SAID SECOND PRESSURE TO MODIFY THE EFFECT OF SAID FIRST PRESSURE UPON SAID PITCH VARYING MEANS TO INCREASE OR DECREASE THE PROPELLER PITCH DEPENDING UPON WHETHER SAID SECOND PRESSURE IS LESS THAN OR GREATER THAN, RESPECTIVELY, SAID FIRST PRESSURE AND UNTIL SAID FIRST PRESSURE AND SAID SECOND PRESSURE ASSUME A PREDETERMINED MINIMUM PRESSURE DIFFERENTIAL THEREBETWEEN.
References Cited (Backward Citations)
US2958381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |