US3794137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for attenuating the noise generated by the expansion of gases into the atmosphere
Assignee: INST PENTRU CREATIC STIINTIFICA SI TEHNICA RU
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Filing: 1972-09-15
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Granted: 1974-02-26
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Expires: 1992-09-15
Abstract
Abstract A device for attenuating the noise generated by the expansion into the atmosphere of the gases an industrial installation. The device utilizes an exterior type Coanda ejector, the body of which has an annular cavity followed by a slot and further by an outer curving profile and a converging cone; the ejector lies in an attenuator ending in an exhaust cone.
Inventors
- 👤 C Teodorescu
- 👤 C Ceauselu
- 👤 G Vasilescu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:20
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/14; F01N1/08; F01N1/10; Y; Y10; Y10S; Y10S239/00; Y10S239/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A device for attenuating the noise generated upon expansion of a gas into the atmosphere, comprising: a duct lined with sound-absorbing material and having an inlet end open to the atmosphere and an outlet end opposite said inlet end; a body in said duct between said ends and defining a constriction therein, said body having an outwardly bulging portion turned toward said inlet end and curving complexly toward the inner walL of said duct in the direction of said outlet end, and a tapering portion converging toward said outlet end and merging with the surface of said bulging portion, said tapering portion defining with said wall of said duct a progressively increasing flow cross-section in the direction of said outlet end, and means forming an annular outwardly open slot immediately adjacent said bulging portion for distributing the expandable gas onto the surfaces of said portions for Coanda flow therealong; and means communicating with said slot for delivering said gas thereto.
Claim 2
Independent Claim
160 words
A device for attenuating the noise generated upon expansion of a gas into the atmosphere, comprising: a duct lined with sound-absorbing material and having an inlet end open to the atmosphere and an outlet end opposite said inlet end; a body in said duct between said ends and defining a constriction therein, said body having an outwardly bulging portion turned toward said inlet end and curving complexly toward the inner walL of said duct in the direction of said outlet end, and a tapering portion converging toward said outlet end and merging with the surface of said bulging portion, said tapering portion defining with said wall of said duct a progressively increasing flow cross-section in the direction of said outlet end, and means forming an annular outwardly open slot immediately adjacent said bulging portion for distributing the expandable gas onto the surfaces of said portions for Coanda flow therealong; and means communicating with said slot for delivering said gas thereto.
Claim 3
Dependent Claim
47 words
The device defined in claim 2 further comprising an outwardly diverging discharge nozzle lined with sound-absorbing material and connected to said duct at said outlet end, and a sound-absorbing screen affixed to said duct and spaced from said inlet end thereof while extending transversely to said duct.
Claim 4
Dependent Claim
43 words
The device defined in claim 2 wherein said means communicating with said slot includes a pipe extending axially through said duct between said inlet end and said slot, said device further comprising a sheath of sound-absorbing material around said pipe in said duct.
Claim 5
Dependent Claim
21 words
The device defined in claim 3 wherein said duct is provided in at least two axially aligned and interconnected tubular sections.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |