US3203179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine control systems
Assignee: De Havilland Aircraft Co Ltd
•
Filing: 1964-08-10
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Granted: 1965-08-31
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Expires: 1984-08-10
Abstract
No abstract record available.
Inventors
- 👤 Benjamin E Blackaby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A CONTROL SYSTEM FOR STARTING A GAS TURBINE ENGINE, THE SYSTEM INCLUDING A CONTROL VALVE FOR CONTROLLING THE FUEL SUPPLY TO SAID ENGINE, ACTUATING MEANS OPERABLE IN RESPONSE TO AN ELECTRICAL INPUT SIGNAL TO CHANGE THE SETTING OF SAID CONTROL VALVE, FIRST MEANS RESPONSIVE TO ENGINE SPEED AND TO AMBIENT TEMPREATURE AND TO ENGINE TEMPREATURE TO DERIVE AN ELECTRICAL TEMPREATURE SIGNAL REPRESENTING THE AMOUNT BY WHICH SAID ENGINE TEMPREATURE IS EXCEEDED BY A DATUM TEMPREATURE WHICH IS A FUNCTION OF ENGINE SPEED AND OF AMBIENT TEMPREATURE, SECOND MEANS RESPONSIVE TO/ ENGINE SPEED AND TO THE DIFFERENCE BETWEEN THE ACTUAL AND DESIRED SETTINGS OF SAID CONTROL VALVE TO DERIVE AN ELECTRICAL RATE-CONTROL SIGNAL, THIRD MEANS RESPONSIVE TO THE ENGINE SPEED AND SUPPLIED WITH SAID TEMPREATURE SIGNAL TO DERIVE AN ELECTRICAL BIASSING SIGNAL AND
Claim 2
Dependent Claim
132 words
A CONTROL SYSTEM FOR STARTING A GAS TURBINE ENGINE, THE SYSTEM INCLUDING A CONTROL VALVE FOR CONTROLLING THE FUEL SUPPLY TO SAID ENGINE, ACTUATING MEANS OPERABLE IN RESPONSE TO AN ELECTRICAL INPUT SIGNAL TO CHANGE THE SETTING OF SAID CONTROL VALVE, FIRST MEANS RESPONSIVE TO ENGINE SPEED AND TO AMBIENT TEMPREATURE AND TO ENGINE TEMPREATURE TO DERIVE AN ELECTRICAL TEMPREATURE SIGNAL REPRESENTING THE AMOUNT BY WHICH SAID ENGINE TEMPREATURE IS EXCEEDED BY A DATUM TEMPREATURE WHICH IS A FUNCTION OF ENGINE SPEED AND OF AMBIENT TEMPREATURE, SECOND MEANS RESPONSIVE TO/ ENGINE SPEED AND TO THE DIFFERENCE BETWEEN THE ACTUAL AND DESIRED SETTINGS OF SAID CONTROL VALVE TO DERIVE AN ELECTRICAL RATE-CONTROL SIGNAL, THIRD MEANS RESPONSIVE TO THE ENGINE SPEED AND SUPPLIED WITH SAID TEMPREATURE SIGNAL TO DERIVE AN ELECTRICAL BIASSING SIGNAL AND
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |