US3299639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbofan engine
Assignee: Individual
•
Filing: 1963-12-24
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Granted: 1967-01-24
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Expires: 1983-12-24
Abstract
No abstract record available.
Inventors
- 👤 Lagelbauer Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:46
CPC Classifications
F; F02; F02K; F02K3/00; F02K3/08; F02K3/105; F02K3/115
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A TURBOFAN ENGINE COMPRISING A CASING HAVING AN INLET AND AN OUTLET; A FAN RECEIVING AIR FROM SAID INLET; PRIMARY DUCT MEANS AND SECONDARY DUCT MEANS RECEIVING AIR COMPRESSED BY SAID FAN; SAID PRIMARY DUCT MEANS AND SAID SECONDARY DUCT MEANS BEING DISPOSED IN FLOW PARALLEL; SAID PRIMARY DUCT MEANS HAVING IN FLOW SERIES A COMPRESSOR, A COMBUSTION CHAMBER, A TURBINE FOR DRIVING SAID FAN AND SAID COMPRESSOR, A PLURALITY OF FIRST HEAT EXCHANGER PASSAGES AND ISENTROPIC EXPANSION NOZZLES FORMED AT THE UPSTREAM END OF SAID FIRST PASSAGES; SAID SECONDARY DUCT MEAN HAVING IN FLOW SERIES SECOND HEAT EXCHANGER PASSAGES, SAID SECOND HEAT EXCHANGER PASSAGES BEING PARALLEL TO AND DISPOSED ADJACENT SAID FIRST HEAT EXCHANGER PASSAGES TO BE IN HEAT EXCHANGE RELATION THERETO AROUND AN ANNULUS UPSTREAM OF SAID CASING OUTLET; AND SECOND ISENTROPIC EXPANSION NOZZLES FORMED AT THE DOWNSTREAM END OF SAID SECOND PASSAGES.
Claim 2
Dependent Claim
145 words
A TURBOFAN ENGINE COMPRISING A CASING HAVING AN INLET AND AN OUTLET; A FAN RECEIVING AIR FROM SAID INLET; PRIMARY DUCT MEANS AND SECONDARY DUCT MEANS RECEIVING AIR COMPRESSED BY SAID FAN; SAID PRIMARY DUCT MEANS AND SAID SECONDARY DUCT MEANS BEING DISPOSED IN FLOW PARALLEL; SAID PRIMARY DUCT MEANS HAVING IN FLOW SERIES A COMPRESSOR, A COMBUSTION CHAMBER, A TURBINE FOR DRIVING SAID FAN AND SAID COMPRESSOR, A PLURALITY OF FIRST HEAT EXCHANGER PASSAGES AND ISENTROPIC EXPANSION NOZZLES FORMED AT THE UPSTREAM END OF SAID FIRST PASSAGES; SAID SECONDARY DUCT MEAN HAVING IN FLOW SERIES SECOND HEAT EXCHANGER PASSAGES, SAID SECOND HEAT EXCHANGER PASSAGES BEING PARALLEL TO AND DISPOSED ADJACENT SAID FIRST HEAT EXCHANGER PASSAGES TO BE IN HEAT EXCHANGE RELATION THERETO AROUND AN ANNULUS UPSTREAM OF SAID CASING OUTLET; AND SECOND ISENTROPIC EXPANSION NOZZLES FORMED AT THE DOWNSTREAM END OF SAID SECOND PASSAGES.
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) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |