US5280708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas purifying device for an outboard motor
Assignee: Yamaha Marine Co Ltd
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Filing: 1992-10-13
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Granted: 1994-01-25
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Expires: 2012-10-13
Abstract
Abstract An exhaust gas purifying arrangement is provided for an outboard motor for a watercraft. At least one exhaust port is provided which opens into a first exhaust passage having a first catalyst member lining at least a portion of its inner wall. The first exhaust passage then opens into an exhaust expansion chamber. Next, a second exhaust passage originates just beyond the expansion chamber. A second catalyst member is mounted within and across a section of exhaust passage beyond the first exhaust passage and at a location above the water line within which the outboard motor operates. A first passageway is provided which leads from the second exhaust passage, from a position beyond the second catalyst member, to an exhaust outlet located at a position below a body of water in which the watercraft operates. And a second passageway leads from the second exhaust passage, also from a position beyond the second catalyst member, to an exhaust outlet located at a position above the body of water in which the watercraft operates. The catalyzer system of the invention is particularly useful for the treating of exhaust gases without introducing undesirable restrictions to exhaust gas flow.
Inventors
- 👤 Masafumi Sougawa
- 👤 Atsushi Isogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:47
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/12; F01N13/004; F01N3/00; F01N3/02; F01N3/04; F01N3/043; F01N3/046; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F02; F02B; F02B61/00; F02B61/04; F02B61/045; B; B63; B63H; B63H20/00; B63H20/24; B63H20/26; F01N2590/00; F01N2590/02; F01N2590/021; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
186 words
An exhaust gas purifying arrangement for a marine engine for a watercraft comprising: an exhaust port and an exhaust conduit system, said conduit system including a first exhaust passage positioned downstream of said exhaust port and communicating at one end with said exhaust port; said conduit system further including an expansion chamber positioned downstream of said first exhaust passage and communicating with a second end of said first exhaust passage; said conduit system further including a second exhaust passage positioned downstream of said expansion chamber and communicating at one end with said expansion chamber; said exhaust gas purifying arrangement also comprising at least one discharge passageway in communication with said conduit system and employable for discharging exhaust gas out of said marine engine; and further comprising a catalyst member mounted within a section of said exhaust conduit system downstream of said expansion chamber; wherein said catalyst member is positioned higher than the level of a body of water within which said watercraft is operable; said exhaust gas purifying arrangement also including means for precluding water from reaching back up through said conduit system towards said engine.
Claim 2
Dependent Claim
186 words
An exhaust gas purifying arrangement for a marine engine for a watercraft comprising: an exhaust port and an exhaust conduit system, said conduit system including a first exhaust passage positioned downstream of said exhaust port and communicating at one end with said exhaust port; said conduit system further including an expansion chamber positioned downstream of said first exhaust passage and communicating with a second end of said first exhaust passage; said conduit system further including a second exhaust passage positioned downstream of said expansion chamber and communicating at one end with said expansion chamber; said exhaust gas purifying arrangement also comprising at least one discharge passageway in communication with said conduit system and employable for discharging exhaust gas out of said marine engine; and further comprising a catalyst member mounted within a section of said exhaust conduit system downstream of said expansion chamber; wherein said catalyst member is positioned higher than the level of a body of water within which said watercraft is operable; said exhaust gas purifying arrangement also including means for precluding water from reaching back up through said conduit system towards said engine.
Claim 3
Dependent Claim
23 words
The exhaust gas purifying arrangement of claim 1 wherein said expansion chamber is operable at least for quieting operation of said outboard motor.
Claim 4
Dependent Claim
19 words
The exhaust gas purifying arrangement of claim 2 wherein said catalyst member is an across the duct type element.
Claim 5
Dependent Claim
48 words
The exhaust gas purifying arrangement of claim 3 wherein said discharge passageway comprises a first passageway leading from said second exhaust passage, from a position downstream of said catalyst member, to an exhaust outlet located at a position below a body of water in which said watercraft operates.
Claim 6
Dependent Claim
49 words
The exhaust gas purifying arrangement of claim 4 wherein said discharge passageway further comprises a second passageway leading from said second exhaust passage, from a position downstream of said catalyst member, to an exhaust outlet located at a position above said body of water in which said watercraft operates.
Claim 7
Dependent Claim
34 words
The exhaust gas purifying arrangement of claim 1 wherein said catalyst member is positioned at least as high within said outboard motor as a level of a downstream outlet of said first exhaust passage.
Claim 8
Dependent Claim
36 words
The exhaust gas purifying arrangement of claim 6 wherein said expansion chamber has a larger flow cross-sectional area between said downstream outlet of said first exhaust passage and said catalyst member than said first exhaust passage.
Claim 9
Dependent Claim
19 words
The exhaust gas purifying arrangement of claim 7 wherein said catalyst member is an across the duct type element.
Claim 10
Dependent Claim
48 words
The exhaust gas purifying arrangement of claim 8 wherein said discharge passageway comprises a first passageway leading from said second exhaust passage, from a position downstream of said catalyst member, to an exhaust outlet located at a position below a body of water in which said watercraft operates.
Claim 11
Dependent Claim
49 words
The exhaust gas purifying arrangement of claim 9 wherein said discharge passageway further comprises a second passageway leading from said second exhaust passage, from a position downstream of said catalyst member, to an exhaust outlet located at a position above said body of water in which said watercraft operates.
Claim 12
Dependent Claim
125 words
An exhaust gas purifying arrangement for a marine engine for a watercraft comprising: an exhaust port and an exhaust conduit system and an exhaust outlet; wherein said conduit system is positioned downstream of said exhaust port and communicates with said exhaust port at one end; and wherein said outlet is positioned downstream of said conduit system and communicates with said exhaust conduit system; and further comprising a catalyst member disposed within said conduit system; wherein said conduit system includes a trap which precludes water from reaching back to said catalyst; and wherein said catalyst is located in an upstream region of said trap; and wherein said conduit system is positioned below the surface level of a body of water within which the watercraft is operable.
Claim 13
Dependent Claim
125 words
An exhaust gas purifying arrangement for a marine engine for a watercraft comprising: an exhaust port and an exhaust conduit system and an exhaust outlet; wherein said conduit system is positioned downstream of said exhaust port and communicates with said exhaust port at one end; and wherein said outlet is positioned downstream of said conduit system and communicates with said exhaust conduit system; and further comprising a catalyst member disposed within said conduit system; wherein said conduit system includes a trap which precludes water from reaching back to said catalyst; and wherein said catalyst is located in an upstream region of said trap; and wherein said conduit system is positioned below the surface level of a body of water within which the watercraft is operable.
Claim 14
Dependent Claim
29 words
The exhaust gas purifying arrangement of claim 11 wherein said exhaust outlet is positioned below the surface level of a body of water within which the watercraft is operated.
Claim 15
Dependent Claim
54 words
The exhaust gas purifying arrangement of claim 11 wherein said trap includes a first downwardly extending passage located downstream of said exhaust port and an upwardly extending passage located downstream of said first downwardly extending passage; said trap further including a bridging passageway communicating said first downwardly extending passage with said upwardly extending passage.
Claim 16
Dependent Claim
28 words
The exhaust gas purifying arrangement of claim 13 wherein said conduit system further includes an expansion chamber between said first downwardly extending passage and said upwardly extending passage.
Claim 17
Dependent Claim
32 words
The exhaust gas purifying arrangement of claim 14 wherein said expansion chamber comprises at least a portion of said bridging passageway communicating said first downwardly extending passage with said upwardly extending passage.
Claim 18
Dependent Claim
23 words
The exhaust gas purifying arrangement of claim 14 wherein said expansion chamber is at least operable for quieting operation of said outboard motor.
Claim 19
Dependent Claim
56 words
The exhaust gas purifying arrangement of claim 14 wherein said bridging passageway is located beneath the surface of a body of water within which said watercraft is operated; and wherein said upwardly extending passage extends from said bridging passageway to a location above the surface of said body of water within which said watercraft is operated.
Claim 20
Dependent Claim
20 words
The exhaust gas purifying arrangement of claim 17 wherein said catalyst member is located within said first downwardly extending passage.
Claim 21
Dependent Claim
18 words
The exhaust gas purifying arrangement of claim 18 wherein said catalyst lines an inner wall of said passage.
Claim 22
Dependent Claim
38 words
The exhaust gas purifying arrangement of claim 11 further comprising a second downwardly extending passage of said conduit system, wherein said second downwardly extending passage is located downstream of said trap and communicates said trap with said outlet.
Claim 23
Dependent Claim
77 words
The exhaust gas purifying arrangement of claim 20 wherein said watercraft includes a transom; and wherein said marine engine is an outboard motor; and further comprising a clamp bracket mounting said outboard motor upon said transom; and wherein a region of said conduit system communicating said upwardly extending passage and said second downwardly extending passage is located within a generally horizontally extending plane within which said clamp bracket and an upper region of said transom are located.
Claim 24
Dependent Claim
185 words
An exhaust gas purifying arrangement for a marine engine for a watercraft comprising: an exhaust port and an exhaust conduit system, said conduit system including a first exhaust passage positioned downstream of said exhaust port and communicating at one end with said exhaust port; said conduit system further including an expansion chamber positioned downstream of said first exhaust passage and communicating with a second end of said first exhaust passage; said conduit system further including a second exhaust passage positioned downstream of said expansion chamber and communicating at one end with said expansion chamber; said exhaust gas purifying arrangement also comprising at least one discharge passageway in communication with said conduit system and employable for discharging exhaust gas out of said marine engine; and further including a trap within said second exhaust passage; said trap operable for precluding water from reaching back to said expansion chamber; and further comprising a catalyst member mounted within a section of said exhaust conduit system upstream of said trap; wherein said trap is positioned higher than the level of a body of water within which said watercraft is operable.
Claim 25
Dependent Claim
185 words
An exhaust gas purifying arrangement for a marine engine for a watercraft comprising: an exhaust port and an exhaust conduit system, said conduit system including a first exhaust passage positioned downstream of said exhaust port and communicating at one end with said exhaust port; said conduit system further including an expansion chamber positioned downstream of said first exhaust passage and communicating with a second end of said first exhaust passage; said conduit system further including a second exhaust passage positioned downstream of said expansion chamber and communicating at one end with said expansion chamber; said exhaust gas purifying arrangement also comprising at least one discharge passageway in communication with said conduit system and employable for discharging exhaust gas out of said marine engine; and further including a trap within said second exhaust passage; said trap operable for precluding water from reaching back to said expansion chamber; and further comprising a catalyst member mounted within a section of said exhaust conduit system upstream of said trap; wherein said trap is positioned higher than the level of a body of water within which said watercraft is operable.
Claim 26
Dependent Claim
30 words
The exhaust gas purifying arrangement of claim 22 wherein a portion of said conduit system upstream of said trap is positioned below the surface level of said body of water.
Claim 27
Dependent Claim
19 words
The exhaust gas purifying arrangement of claim 22 wherein said catalyst member is mounted within said first exhaust passage.
Claim 28
Dependent Claim
19 words
The exhaust gas purifying arrangement of claim 22 wherein said catalyst member is mounted within said second exhaust passage.
Claim 29
Dependent Claim
38 words
The exhaust gas purifying arrangement of claim 22 wherein said portion of said conduit system upstream of said trap which is positioned below the surface level of said body of water is a part of said expansion chamber.
Claim 30
Dependent Claim
23 words
The exhaust gas purifying arrangement of claim 22 wherein said expansion chamber is operable at least for quieting operation of said outboard motor.
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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) | 1997-01-24 | 1997-07-26 | 1998-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-01-24 | 2001-07-26 | 2002-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-01-24 | 2005-07-26 | 2006-01-25 | $7700.00 | Window Closed / Lapsed |