US3659547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust system for tunnel stern boat
Assignee: PENN YAN BOATS Inc
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Filing: 1970-06-01
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Granted: 1972-05-02
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Expires: 1990-06-01
Abstract
Abstract In a tunnel stern boat having a propeller in the tunnel and a spray plate and rudder aft of the tunnel, the exhaust from an inboard engine is piped to a transom opening from which it is guided downward and directed under the spray plate into the high speed stream of water thrust aft from the propeller.
Inventors
- 👤 Robert B Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:31
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A marine exhaust system for a tunnel stern, planing boat having an inboard engine for driving a propeller recessed in said tunnel, said system comprising: a. a spray plate extending aft from the transom of said boat closely over the stream of water thrust aft from said tunnel by said propeller; b. said transom having an opening; c. an exhaust pipe for conducting exhaust from said engine to said transom opening; and d. means aft of said transom opening for guiding said exhaust downward to the region of said spray plate and for directing said exhaust into the water under said spray plate.
Claim 2
Dependent Claim
103 words
A marine exhaust system for a tunnel stern, planing boat having an inboard engine for driving a propeller recessed in said tunnel, said system comprising: a. a spray plate extending aft from the transom of said boat closely over the stream of water thrust aft from said tunnel by said propeller; b. said transom having an opening; c. an exhaust pipe for conducting exhaust from said engine to said transom opening; and d. means aft of said transom opening for guiding said exhaust downward to the region of said spray plate and for directing said exhaust into the water under said spray plate.
Claim 3
Dependent Claim
43 words
The exhaust system of claim 1 wherein said spray plate has an opening and said guiding means encloses a space between said transom opening and said spray plate opening for directing said exhaust through said spray plate opening into said stream of water.
Claim 4
Dependent Claim
23 words
The exhaust system of claim 2 wherein said opening in said spray plate is in the central after region of said spray plate.
Claim 5
Dependent Claim
19 words
The exhaust system of claim 2 including a cowling generally angled downward and aft from said spray plate opening.
Claim 6
Dependent Claim
16 words
The exhaust system of claim 2 wherein said spray plate has a pair of said openings.
Claim 7
Dependent Claim
23 words
The exhaust system of claim 2 wherein said enclosing means comprises a pipe extending from said transom opening to said spray plate opening.
Claim 8
Dependent Claim
32 words
The exhaust system of claim 1 wherein said transom opening is above said spray plate, and said guiding means comprises a shroud secured to said transom and fitting over said spray plate.
Claim 9
Dependent Claim
19 words
The exhaust system of claim 7 wherein said shroud is formed of relatively resilient material to muffle said exhaust.
Claim 10
Dependent Claim
23 words
The exhaust system of claim 7 including means for sealing said shroud to said transom, said shroud being loosely adjacent said spray plate.
Claim 11
Dependent Claim
34 words
The exhaust system of claim 7 wherein said spray plate has an opening in its after central region beneath said shroud so that said exhaust passes through said opening into said stream of water.
Claim 12
Dependent Claim
19 words
The exhaust system of claim 10 including a cowling generally angled downward and aft from said spray plate opening.
Claim 13
Dependent Claim
23 words
The exhaust system of claim 11 including means for sealing said shroud to said transom, said shroud being loosely adjacent said spray plate.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |