US3514952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable bypass turbofan engine
Assignee: United States Department of the Air Force
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Filing: 1964-07-01
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Granted: 1970-06-02
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Expires: 1984-07-01
Abstract
No abstract record available.
Inventors
- 👤 Howard E Schumacher
- 👤 Jack Richens
- 👤 Marvin F Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/02; F02K3/04; F02K3/075
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
215 words
A VARIABLE BYPASS TURBOFAN ENGINE COMPRISING IN COMBINATION: A FIRST COMPRESSOR SECTION HAVING VARIABLE STATOR BLADES, A TRANSITION CHAMBER, A SECOND COMPRESSOR SECTION HAVING VARIABLE STATOR BLADES, A FIRST COMBUSTION APPARATUS, A FIRST TURBINE SECTION HAVING VARIABLE STATOR BLADES, A SECOND TURBINE SECTION HAVING VARIABLE STATOR BLADES, AND AN EXHAUST NOZZLE ARRANGED COAXIALLY FOR SERIES FLOW THERETHROUGH IN THE ORDER NAMED, AND WITH SAID FIRST TURBINE SECTION ROTATABLY JOINED TO SAID SECOND COMPRESSOR SECTION AND SECOND TURBINE SECTION ROTATABLY JOINED TO SAID FIRST COMPRESSOR SECTION; AN AFTERBURNER SECTION TERMINATING AT THE REAR IN A VARIABLE AREA EXHAUST NOZZLE COAXIALLY SURROUNDING SAID EXHAUST NOZZLE AND ADJUSTABLE BETWEEN ZERO AREA AND FULL AREA POSITIONS; A BYPASS DUCT MEANS JOINING SAID TRANSISTION CHAMBER TO SAID AFTERBURNER SECTION; A VALVE MEANS JOINED TO SAID BYPASS DUCT; THE VARIABLE ARE EXHAUST NOZZLE ON SAID AFTERBUNER SECTION AND SAID VALVE, MEANS SINGLY AND IN COMBINATION, CONTROLLING THE FLOW IN SAID BYPASS DUCT BETWEEN THE LIMITS OF ZERO FLOW AND A PREDETERMINED MAXIMUM PERCENTAGE OF THE TOTAL THROUGH SAID FIRST COMPRESSOR SECTION; A SECOND COMBUSTION APPARATUS WITHIN SAID AFTERBURNER SECTION; MEANS FOR SELECTIVELY AND VARIABLY ADJUSTING THE STATOR VANES IN SAID COMPRESSOR AND SAID TURBINE SECTIONS; AND MEANS FOR SELECTIVELY AND VARIABLY SUPPLYING FUEL LTO SAID FIRST AND SAID SECOND COMBUSTION APPARATUSES.
Claim 2
Dependent Claim
215 words
A VARIABLE BYPASS TURBOFAN ENGINE COMPRISING IN COMBINATION: A FIRST COMPRESSOR SECTION HAVING VARIABLE STATOR BLADES, A TRANSITION CHAMBER, A SECOND COMPRESSOR SECTION HAVING VARIABLE STATOR BLADES, A FIRST COMBUSTION APPARATUS, A FIRST TURBINE SECTION HAVING VARIABLE STATOR BLADES, A SECOND TURBINE SECTION HAVING VARIABLE STATOR BLADES, AND AN EXHAUST NOZZLE ARRANGED COAXIALLY FOR SERIES FLOW THERETHROUGH IN THE ORDER NAMED, AND WITH SAID FIRST TURBINE SECTION ROTATABLY JOINED TO SAID SECOND COMPRESSOR SECTION AND SECOND TURBINE SECTION ROTATABLY JOINED TO SAID FIRST COMPRESSOR SECTION; AN AFTERBURNER SECTION TERMINATING AT THE REAR IN A VARIABLE AREA EXHAUST NOZZLE COAXIALLY SURROUNDING SAID EXHAUST NOZZLE AND ADJUSTABLE BETWEEN ZERO AREA AND FULL AREA POSITIONS; A BYPASS DUCT MEANS JOINING SAID TRANSISTION CHAMBER TO SAID AFTERBURNER SECTION; A VALVE MEANS JOINED TO SAID BYPASS DUCT; THE VARIABLE ARE EXHAUST NOZZLE ON SAID AFTERBUNER SECTION AND SAID VALVE, MEANS SINGLY AND IN COMBINATION, CONTROLLING THE FLOW IN SAID BYPASS DUCT BETWEEN THE LIMITS OF ZERO FLOW AND A PREDETERMINED MAXIMUM PERCENTAGE OF THE TOTAL THROUGH SAID FIRST COMPRESSOR SECTION; A SECOND COMBUSTION APPARATUS WITHIN SAID AFTERBURNER SECTION; MEANS FOR SELECTIVELY AND VARIABLY ADJUSTING THE STATOR VANES IN SAID COMPRESSOR AND SAID TURBINE SECTIONS; AND MEANS FOR SELECTIVELY AND VARIABLY SUPPLYING FUEL LTO SAID FIRST AND SAID SECOND COMBUSTION APPARATUSES.
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) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |