US5366401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust cleaning system for marine propulsion engine
Assignee: Yamaha Marine Co Ltd
•
Filing: 1993-06-04
•
Granted: 1994-11-22
•
Expires: 2013-06-04
Abstract
Abstract An exhaust cleaning system for a marine propulsion engine that includes a catalyst positioned within a tube that communicates with an expansion chamber. A cooling jacket extends around at least a portion of the exhaust system and the liquid coolant is discharged into the exhaust system for flow with the exhaust gases. A number of different arrangements are shown for precluding the coolant from flowing back into the exhaust system and contacting the catalyst bed either when the watercraft is inverted and righted or in the event the engine is stopped and restarted.
Inventors
- 👤 Masayoshi Nanami
- 👤 Atsushi Isogawa
- 👤 Honda Masahiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:40
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/12; B; B63; B63B; B63B34/00; B63B34/10; B63H; B63H21/00; B63H21/24; B63H21/32; F01N13/004; F01N3/00; F01N3/02; F01N3/04; F01N3/043; F01N3/046; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2882; F01N3/2885; F02; F02B; F02B61/00; F02B61/04; F02B61/045; B63H21/12; B63H21/14; F01N2590/00; F01N2590/02; F01N2590/022; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
128 words
An exhaust system for a watercraft comprised of a hull containing an internal combustion engine mounted within said hull and having at least one exhaust port, said exhaust system being comprised of an exhaust conduit having an inlet end communicating with said exhaust port for receiving exhaust gases therefrom and an outlet end exiting through said hull for discharging the exhaust gases to the atmosphere in proximity to the body of water in which the watercraft is operating in at least some conditions of said watercraft, said exhaust conduit including means defining an expansion chamber and a tube containing a catalyst bed contained within said expansion chamber and through which exhaust gases must pass, and means for precluding water in said exhaust conduit from entering said tube end.
Claim 2
Dependent Claim
128 words
An exhaust system for a watercraft comprised of a hull containing an internal combustion engine mounted within said hull and having at least one exhaust port, said exhaust system being comprised of an exhaust conduit having an inlet end communicating with said exhaust port for receiving exhaust gases therefrom and an outlet end exiting through said hull for discharging the exhaust gases to the atmosphere in proximity to the body of water in which the watercraft is operating in at least some conditions of said watercraft, said exhaust conduit including means defining an expansion chamber and a tube containing a catalyst bed contained within said expansion chamber and through which exhaust gases must pass, and means for precluding water in said exhaust conduit from entering said tube end.
Claim 3
Dependent Claim
26 words
An exhaust system for a watercraft as set forth in claim 1 wherein the means for precluding water from entering the tube end comprises baffle means.
Claim 4
Dependent Claim
29 words
An exhaust system for a watercraft as set forth in claim 2 wherein the baffle means is positioned in the expansion chamber in confronting relationship to the tube end.
Claim 5
Dependent Claim
27 words
An exhaust system for a watercraft as set forth in claim 2 wherein the baffle means is disposed downstream of the expansion chamber in the exhaust conduit.
Claim 6
Dependent Claim
30 words
An exhaust system for a watercraft as set forth in claim 1 wherein the means for precluding water in the exhaust conduit from entering the tube end comprises valve means.
Claim 7
Dependent Claim
23 words
An exhaust system for a watercraft as set forth in claim 5 wherein the valve means is positioned downstream of the expansion chamber.
Claim 8
Dependent Claim
34 words
An exhaust system for a watercraft as set forth in claim 6 wherein the valve means is moveable between an open position and a closed position and is biased to one of said positions.
Claim 9
Dependent Claim
37 words
An exhaust system for a watercraft as set forth in claim 7 wherein the valve means is biased to its closed position and is opened by the pressure of the exhaust gases when the engine is running.
Claim 10
Dependent Claim
32 words
An exhaust system for a watercraft as set forth in claim 7 wherein the valve means is biased to its opened position and is closed in response to inversion of the watercraft.
Claim 11
Dependent Claim
44 words
An exhaust system for a watercraft as set forth in claim 1 wherein the means for precluding water in the exhaust conduit from entering the tube end comprises a further expansion chamber disposed downstream in the exhaust conduit from the first mentioned expansion chamber.
Claim 12
Dependent Claim
61 words
An exhaust system for a watercraft as set forth in claim 10 wherein the first expansion chamber communicates with the second expansion chamber through a first pipe section and the second expansion chamber communicates with the downstream end of the exhaust conduit with a second pipe section and wherein the first and second pipe sections are offset relative to each other.
Claim 13
Dependent Claim
32 words
An exhaust system for a watercraft as set forth in claim 10 wherein there is provided baffle means in the further expansion chamber for precluding water from impending on the catalyst bed.
Claim 14
Dependent Claim
61 words
An exhaust system for a watercraft as set forth in claim 12 wherein the first expansion chamber communicates with the second expansion chamber through a first pipe section and the second expansion chamber communicates with the downstream end of the exhaust conduit with a second pipe section and wherein the first and second pipe sections are offset relative to each other.
Claim 15
Dependent Claim
26 words
An exhaust system for a watercraft as set forth in claim 13 further including valve means for controlling the flow through one of the pipe sections.
Claim 16
Dependent Claim
23 words
An exhaust system for a watercraft as set forth in claim 14 wherein the valve means is disposed in the first pipe section.
Claim 17
Dependent Claim
34 words
An exhaust system for a watercraft as set forth in claim 15 wherein the valve means is moveable between an open position and a closed position and is biased to one of said positions.
Claim 18
Dependent Claim
37 words
An exhaust system for a watercraft as set forth in claim 16 wherein the valve means is biased to its closed position and is opened by the pressure of the exhaust gases when the engine is running.
Claim 19
Dependent Claim
32 words
An exhaust system for a watercraft as set forth in claim 16 wherein the valve means is biased to its opened position and is closed in response to inversion of the watercraft.
Claim 20
Dependent Claim
28 words
An exhaust system for a watercraft as set forth in claim 10 further including means in the expansion chamber to form a well in which water may accumulate.
Claim 21
Dependent Claim
26 words
An exhaust system for a watercraft as set forth in claim 19 wherein the expansion chamber includes a pipe section around which the well is formed.
Claim 22
Dependent Claim
40 words
An exhaust system for a watercraft as set forth in claim 20 further including means in the additional expansion chamber for forming a further well in which water may accumulate to a level higher than that of the pipe section.
Claim 23
Dependent Claim
24 words
An exhaust system for a watercraft as set forth in claim 1 wherein the tub divides the expansion chamber into two expansion chamber sections.
Claim 24
Dependent Claim
22 words
An exhaust system for a watercraft as set forth in claim 22 wherein the expansion chamber are formed in a common housing.
Claim 25
Dependent Claim
23 words
An exhaust system for a watercraft as set forth in claim 23 further including means defining a cooling jacket around the expansion chamber.
Claim 26
Dependent Claim
20 words
An exhaust system for a watercraft as set forth in claim 24 wherein the cooling jacket further encircles the pipe.
Claim 27
Dependent Claim
26 words
An exhaust system for a watercraft as set forth in claim 24 wherein the means for precluding water from entering the tube end comprises baffle means.
Claim 28
Dependent Claim
29 words
An exhaust system for a watercraft as set forth in claim 26 wherein the baffle means is positioned in the expansion chamber in confronting relationship to the tube end.
Claim 29
Dependent Claim
27 words
An exhaust system for a watercraft as set forth in claim 26 wherein the baffle means is disposed downstream of the expansion chamber in the exhaust conduit.
Claim 30
Dependent Claim
30 words
An exhaust system for a watercraft as set forth in claim 24 wherein the means for precluding water in the exhaust conduit from entering the tube end comprises valve means.
Claim 31
Dependent Claim
23 words
An exhaust system for a watercraft as set forth in claim 29 wherein the valve means is positioned downstream of the expansion chamber.
Claim 32
Dependent Claim
34 words
An exhaust system for a watercraft as set forth in claim 30 wherein the valve means is moveable between an open position and a closed position and is biased to one of said positions.
Claim 33
Dependent Claim
37 words
An exhaust system for a watercraft as set forth in claim 31 wherein the valve means is biased to its closed position and is opened by the pressure of the exhaust gases when the engine is running.
Claim 34
Dependent Claim
32 words
An exhaust system for a watercraft as set forth in claim 31 wherein the valve means is biased to its opened position and is closed in response to inversion of the watercraft.
Claim 35
Dependent Claim
44 words
An exhaust system for a watercraft as set forth in claim 24 wherein the means for precluding water in the exhaust conduit from entering the tube end comprises a further expansion chamber disposed downstream in the exhaust conduit from the first mentioned expansion chamber.
Claim 36
Dependent Claim
61 words
An exhaust system for a watercraft as set forth in claim 34 wherein the first expansion chamber communicates with the second expansion chamber through a first pipe section and the second expansion chamber communicates with the downstream end of the exhaust conduit with a second pipe section and wherein the first and second pipe sections are offset relative to each other.
Claim 37
Dependent Claim
32 words
An exhaust system for a watercraft as set forth in claim 34 wherein there is provided baffle means in the further expansion chamber for precluding water from impending on the catalyst bed.
Claim 38
Dependent Claim
61 words
An exhaust system for a watercraft as set forth in claim 36 wherein the first expansion chamber communicates with the second expansion chamber through a first pipe section and the second expansion chamber communicates with the downstream end of the exhaust conduit with a second pipe section and wherein the first and second pipe sections are offset relative to each other.
Claim 39
Dependent Claim
26 words
An exhaust system for a watercraft as set forth in claim 37 further including valve means for controlling the flow through one of the pipe sections.
Claim 40
Dependent Claim
23 words
An exhaust system for a watercraft as set forth in claim 38 wherein the valve means is disposed in the first pipe section.
Claim 41
Dependent Claim
34 words
An exhaust system for a watercraft as set forth in claim 39 wherein the valve means is moveable between an open position and a closed position and is biased to one of said positions.
Claim 42
Dependent Claim
37 words
An exhaust system for a watercraft as set forth in claim 40 wherein the valve means is biased to its closed position and is opened by the pressure of the exhaust gases when the engine is running.
Claim 43
Dependent Claim
32 words
An exhaust system for a watercraft as set forth in claim 40 wherein the valve means is biased to its opened position and is closed in response to inversion of the watercraft.
Claim 44
Dependent Claim
28 words
An exhaust system for a watercraft as set forth in claim 34 further including means in the expansion chamber to form a well in which water may accumulate.
Claim 45
Dependent Claim
26 words
An exhaust system for a watercraft as set forth in claim 43 wherein the expansion chamber includes a pipe section around which the well is formed.
Claim 46
Dependent Claim
40 words
An exhaust system for a watercraft as set forth in claim 44 further including means in the additional expansion chamber for forming a further well in which water may accumulate to a level higher than that of the pipe section.
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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) | 1997-11-21 | 1998-05-23 | 1998-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-21 | 2002-05-23 | 2002-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-21 | 2006-05-23 | 2006-11-22 | $7700.00 | Window Closed / Lapsed |