US4506506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust emission control device for diesel engine
Assignee: Hitachi Ltd
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Filing: 1983-07-27
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Granted: 1985-03-26
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Expires: 2003-07-27
Abstract
Abstract An exhaust emission control device for Diesel engines comprising a trap disposed in an exhaust pipe connected to an exhaust manifold and a trap-heating burner disposed outside the exhaust pipe, whereby a combustion gas from the burner is led to the outer peripheral portion of the trap to heat the same. According to the exhaust emission control device for Diesel engines of the present invention, the stable oxidation of particulates collected on the trap in the exhaust pipe is achieved independently of the flow rate of the exhaust gas, the exhaust pressure and the amount of O 2 in the exhaust gas.
Inventors
- 👤 Toshifumi Usui
- 👤 Syozo Yanagisawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:28
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/025; F01N3/0253; F01N3/0256; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S55/00; Y10S55/10; Y10S55/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
86 words
An exhaust emission control device for Diesel engines comprising: (a) an exhaust pipe for introducing the exhaust gas from a Diesel engine to the outside; (b) a trap disposed in said exhaust pipe for collecting particulates in the exhaust gas; (c) a burner disposed outside said exhaust pipe; and (d) a combustion gas passage for introducing the combustion gas from said burner to the outer periphery of said trap to superheat said trap while isolating the combustion gas from the exhaust gas in said exhaust pipe.
Claim 2
Dependent Claim
86 words
An exhaust emission control device for Diesel engines comprising: (a) an exhaust pipe for introducing the exhaust gas from a Diesel engine to the outside; (b) a trap disposed in said exhaust pipe for collecting particulates in the exhaust gas; (c) a burner disposed outside said exhaust pipe; and (d) a combustion gas passage for introducing the combustion gas from said burner to the outer periphery of said trap to superheat said trap while isolating the combustion gas from the exhaust gas in said exhaust pipe.
Claim 3
Dependent Claim
20 words
An exhaust emission control device for Diesel engines according to claim 1, wherein said trap is a ceramic honeycomb trap.
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) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |