US3568694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet engine installation for noise control
Assignee: Lockheed Martin Corp
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Filing: 1968-05-08
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Granted: 1971-03-09
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Expires: 1988-05-08
Abstract
Abstract A jet or fan-jet engine installation wherein inlet noise is reduced on takeoff and landing by changing the direction of the noise radiated from the inlet and by using an inlet duct having soundproofing. Exhaust noise is reduced by use of tertiary air bleed (or quaternary bleed) to reduce the shearing velocity of the final jet.
Inventors
- 👤 Clarence L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:43
CPC Classifications
B; B64; B64D; B64D33/00; B64D33/02; F; F02; F02C; F02C7/00; F02C7/04; F02C7/045; F02K; F02K1/00; F02K1/38; B64D2033/0206; B64D2033/0266; B64D2033/0286; Y; Y10; Y10T; Y10T137/00; Y10T137/0536
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
The combination comprising a nacelle, an engine mounted in said nacelle, an inlet on the forward end of the nacelle, an upwardly opening inlet, a deflector at the rear of the last mentioned inlet for deflecting air into the nacelle, and a vane positioned in the first mentioned inlet and rotatable about a horizontal axis in the center of the inlet and transverse to the longitudinal axis of the inlet, said vane when closed sloping down toward the rear of the inlet.
Claim 2
Dependent Claim
82 words
The combination comprising a nacelle, an engine mounted in said nacelle, an inlet on the forward end of the nacelle, an upwardly opening inlet, a deflector at the rear of the last mentioned inlet for deflecting air into the nacelle, and a vane positioned in the first mentioned inlet and rotatable about a horizontal axis in the center of the inlet and transverse to the longitudinal axis of the inlet, said vane when closed sloping down toward the rear of the inlet.
References Cited (Backward Citations)
US2869670A
Cited
US3347496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |