US4310067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optimized diesel engine exhaust silencer
Assignee: United States Department of the Navy
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Filing: 1968-11-27
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Granted: 1982-01-12
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Expires: 1988-11-27
Abstract
Abstract An exhaust silencer system for piston type internal combustion engines hag a wet-exhaust, having a muffler and a muffler bypass which contains water at slow and moderate engine speeds, the water being expelled by the exhaust gas pressure at high engine speed, opening said bypass to the flow of exhaust gases thus reducing the exhaust back pressure occurring in the muffler.
Inventors
- 👤 Donald C. Thomson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:00
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/04; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
An exhaust silencer system for piston type internal combustion engines comprising: a fluid conduit comprising in tandem an exhaust pipe, a muffler, and a tail pipe; and a bypass tube capable of trapping a liquid under the force of gravity, fluidly coupled to said fluid conduit to bypass at least a portion of said muffler, whereby at low exhaust pressure the liquid is held in said bypass, and at a predetermined higher exhaust pressure the water is expelled.
Claim 2
Dependent Claim
78 words
An exhaust silencer system for piston type internal combustion engines comprising: a fluid conduit comprising in tandem an exhaust pipe, a muffler, and a tail pipe; and a bypass tube capable of trapping a liquid under the force of gravity, fluidly coupled to said fluid conduit to bypass at least a portion of said muffler, whereby at low exhaust pressure the liquid is held in said bypass, and at a predetermined higher exhaust pressure the water is expelled.
Claim 3
Dependent Claim
26 words
The exhaust silencer system of claim 1 wherein said bypass tube interconnects with said exhaust pipe and said tail pipe thereby selectively bypassing the entire muffler.
Claim 4
Dependent Claim
27 words
The exhaust silencer system of claim 1 wherein said muffler comprises three expansion chambers and said bypass tube interconnects with a first chamber and a third chamber.
Claim 5
Dependent Claim
17 words
The exhaust silencer system of claim 1 further comprising a water inlet connection to said exhaust pipe.
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) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |