Patent US3693880A successfully refreshed from Google Patents.
US3693880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared suppressor means
Assignee: United States Department of the Navy
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Filing: 1970-11-02
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Granted: 1972-09-26
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Expires: 1990-11-02
Abstract
Abstract An air-cooled contoured plug fitted within the exhaust pipe of a gas turbine engine is designed also for use with an afterburning turbojet type having variable position nozzle leaves. The plug is large enough in diameter to hide from view hot engine parts forward of the plug, such as the turbine wheel, exhaust cone, flameholders, and the exhaust pipe wall. By reducing the intensity of radiation from a turbojet engine when operating in non-afterburning power, the detection of a turbojet-powered aircraft by a heat-seeking missile is minimized.
Inventors
- 👤 Edward F Versaw
- 👤 Herbert C Moe
- 👤 Jerry L Reed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:24
CPC Classifications
B; B64; B64D; B64D33/00; B64D33/04; B64D33/06; F; F02; F02K; F02K1/00; F02K1/04; F02K1/78; F02K1/82; F02K1/822; F02K1/825
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
In a device for attenuating the radiation emitted from an engine exhaust pipe comprising a contoured plug fixed within and spaced from the walls of said exhaust pipe; means for cooling said walls and said plug; said plug being attached to said walls by means of hollow struts; said cooling means including means for causing air to be distributed around the after end of said plug through said hollow struts; the improvement comprising: said after end of said plug being separated from the forward portion of said plug by a heat shield; and said heat shield comprising a disc orthogonal to and substantially bisecting the longitudinal axis of said plug.
Claim 2
Dependent Claim
110 words
In a device for attenuating the radiation emitted from an engine exhaust pipe comprising a contoured plug fixed within and spaced from the walls of said exhaust pipe; means for cooling said walls and said plug; said plug being attached to said walls by means of hollow struts; said cooling means including means for causing air to be distributed around the after end of said plug through said hollow struts; the improvement comprising: said after end of said plug being separated from the forward portion of said plug by a heat shield; and said heat shield comprising a disc orthogonal to and substantially bisecting the longitudinal axis of said plug.
Claim 3
Dependent Claim
19 words
The device of claim 1 wherein said shield comprises two sheets of stainless steel separated by a honeycomb core.
References Cited (Backward Citations)
US3210934A
Cited
US3332243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |