US3671171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annular combustors
Assignee: Avco Corp
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Filing: 1970-11-27
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Granted: 1972-06-20
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Expires: 1990-11-27
Abstract
Abstract THE DISCLOSURE ILLUSTRATES AN ANNULAR COMBUSTOR HAVING AIR INLETS IN THE UPSTREAM END OF THE COMBUSTOR TO ESTABLISH A VORTES FLOW OF COMBUSTION GASES ADJACENT THE COMBUSTOR FUEL NOZZLES. A PAIR OF RELATIVELY LARGE LATERALLY SPACED DUCTS DOWNSTREAM OF EACH FUEL NOZZLE DIRECT A FLOW OF AIR TOWARD THE HEAD END OF THE COMBUSTOR TO REINFORCE THE VORTEX FLOW AND DEFLECT IT INTO A HORSESHOE SHAPE HAVING DOWNSTREAM EXTENDING LEGS. THE AIR FROM THE LATERALLY POSITIONED DUCTS PROMOTES CIRCUMFERENTIAL RECIRCULATION NEAR THE FUEL NOZZLES TO STABILIZE COMBUSTION. A PAIR OF RELATIVE SMALLER DOWNSTREAM DUCTS PROVIDE STREAMS OF VORTEX FLOW.
Inventors
- 👤 Brian W Doyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:53
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/42; F23R3/50; F23C; F23C3/00; F23C7/00; F23C7/02; F23R3/02; F23R3/04; F23R3/10; F23R3/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |