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US4526002A
Expired / Lapsed
US
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Exhaust relief system
Assignee: Brunswick Corp
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Filing: 1983-12-27
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Granted: 1985-07-02
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Expires: 2003-12-27
Abstract
Abstract The engine (11) of a stern drive (10) is provided with a vacuum relief valve (28) to relieve any vacuum which may occur in the exhaust manifold (16), thus preventing water from entering the engine through the exhaust system. The relief valve (28) is connected to allow one-way flow from the intake manifold (15) to the exhaust system, thus providing an essentially closed system.
Inventors
- 👤 Lawrence C. Bibow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:41
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/12; F01N13/08; F01N13/085; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B61/00; F02B61/04; F02B61/045
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
In a four cycle engine having an intake manifold for supplying air to the engine and an exhaust system for discharging engine exhaust underwater, the improvement comprising: a vacuum relief means connected to said exhaust system to relieve any vacuum created in said exhaust system, thereby preventing water from entering said engine through said exhaust system, and vacuum relief means including a passageway connecting said intake manifold with said exhaust system and a one-way valve mounted in said passageway allowing flow into said exhaust system.
Claim 2
Dependent Claim
85 words
In a four cycle engine having an intake manifold for supplying air to the engine and an exhaust system for discharging engine exhaust underwater, the improvement comprising: a vacuum relief means connected to said exhaust system to relieve any vacuum created in said exhaust system, thereby preventing water from entering said engine through said exhaust system, and vacuum relief means including a passageway connecting said intake manifold with said exhaust system and a one-way valve mounted in said passageway allowing flow into said exhaust system.
Claim 3
Dependent Claim
19 words
The device defined in claim 1 wherein said passageway is connected to said exhaust system above the water surface.
Claim 4
Dependent Claim
24 words
The device defined in claim 2 wherein the passageway is connected to said exhaust system at approximately the highest point of said exhaust system.
Claim 5
Dependent Claim
39 words
The device defined in claim 3 wherein said exhaust system includes an exhaust manifold, an exhaust elbow from said manifold, and an exhaust discharge passage from said exhaust elbow, and wherein said passageway is connected to said exhaust elbow.
Claim 6
Dependent Claim
22 words
The device defined in claim 4 wherein said exhaust elbow includes a water jacket and said passageway passes through said water jacket.
References Cited (Backward Citations)
US3552121A
Cited
US3921398A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |