US3620329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet engine noise suppressor
Assignee: Glasrock Products Inc
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Filing: 1969-12-31
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Granted: 1971-11-16
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Expires: 1989-12-31
Abstract
Abstract A jet engine noise suppressor for use during ground run up of a jet engine comprising a tube having thick inner walls of a highly porous open cell ceramic material such as porous fused silica. The tube is constructed of numerous blocks of the ceramic material arranged in a circle to form a substantially circular passageway, alternate blocks extending further into the passageway to form recesses in the tube that create sounddissipating eddys.
Inventors
- 👤 Karl Wenzlaff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:59
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/26
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
Apparatus for suppressing the sound from a jet engine exhaust comprising: a tube for receiving said exhaust, said tube having inner walls of a highly porous open cell ceramic material, said inner walls including numerous blocks of said ceramic material arranged in a circle to form a substantially circular passageway, some of said blocks extending radially inwardly further into said passageway than others to form grooves extending along the length of said tube, whereby to better absorb sound.
Claim 2
Dependent Claim
78 words
Apparatus for suppressing the sound from a jet engine exhaust comprising: a tube for receiving said exhaust, said tube having inner walls of a highly porous open cell ceramic material, said inner walls including numerous blocks of said ceramic material arranged in a circle to form a substantially circular passageway, some of said blocks extending radially inwardly further into said passageway than others to form grooves extending along the length of said tube, whereby to better absorb sound.
Claim 3
Dependent Claim
132 words
A jet engine noise suppressor comprising: a tube having a first end for receiving the exhaust from a jet engine and a second end for directing said exhaust into the atmosphere, said tube including an outer casing, and walls within said casing forming a tube portion for carrying gases received from said engine; said walls constructed of a porous ceramic material of at least several inches thickness with a majority of its volume occupied by pores that are connected to one another, said material being of open cell construction, with cells of an average diameter of less than one-eighth inch, and said walls having a plurality of depressions of at least an inch in width and extending along the length of said tube, whereby to absorb high and low frequency sound components.
Claim 4
Dependent Claim
132 words
A jet engine noise suppressor comprising: a tube having a first end for receiving the exhaust from a jet engine and a second end for directing said exhaust into the atmosphere, said tube including an outer casing, and walls within said casing forming a tube portion for carrying gases received from said engine; said walls constructed of a porous ceramic material of at least several inches thickness with a majority of its volume occupied by pores that are connected to one another, said material being of open cell construction, with cells of an average diameter of less than one-eighth inch, and said walls having a plurality of depressions of at least an inch in width and extending along the length of said tube, whereby to absorb high and low frequency sound components.
Claim 5
Dependent Claim
65 words
A jet engine noise suppressor comprising: a tube having a first end for receiving the exhaust from a jet engine and a second end for directing said exhaust into the atmosphere, said tube having inner walls constructed of porous material forming a passageway for said exhaust, said inner walls forming a plurality of grooves extending in a direction axially along the length of said passageway.
Claim 6
Dependent Claim
65 words
A jet engine noise suppressor comprising: a tube having a first end for receiving the exhaust from a jet engine and a second end for directing said exhaust into the atmosphere, said tube having inner walls constructed of porous material forming a passageway for said exhaust, said inner walls forming a plurality of grooves extending in a direction axially along the length of said passageway.
Claim 7
Dependent Claim
21 words
The jet engine described in claim 3 wherein: said passageway is substantially circular, and said grooves extend radially into said walls.
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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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |