US4867768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Muffler apparatus with filter trap and method of use
Assignee: Donaldson Co Inc
•
Filing: 1988-03-28
•
Granted: 1989-09-19
•
Expires: 2008-03-28
Abstract
Abstract Muffler apparatus for reducing both sound and particulates from exhaust gases from an engine. The apparatus includes resonating chambers, flow distribution structure and a cellular ceramic core filter module. Filter regeneration mechanism includes a heating element for heating the carbon on the inlet end of the ceramic core to combustion temperature. Particulate ignition resulting in regeneration occurs when combustion air is provided; in alternate embodiments, combustion air first flows through a preheater system. A processor unit with particular logic controls the apparatus.
Inventors
- 👤 Wayne M. Wagner
- 👤 Bruce B. Hoppenstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:13
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/033; F01N3/0335; F01N3/0211; F01N3/023; F01N3/027; F01N3/031; F01N3/032; F01N9/00; F01N9/002; F01N2230/00; F01N2230/02; F01N2310/00; F01N2310/12; F01N2330/00; F01N2330/06; F01N2350/00; F01N2350/02; F01N2350/04; F01N2350/06; F01N2410/00; F01N2410/04; F01N2450/00; F01N2450/02; F01N2470/00; F01N2470/02; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y10; Y10S; Y10S55/00; Y10S55/05; Y10S55/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
Cleaning apparatus for exhaust gases from an engine, comprising: a housing having an inlet, an outlet, and a fluid flow path leading from said inlet upstream to said outlet downstream; means, within said housing along said fluid flow path, for filtering particulates from said exhaust gases, said filtering means including a ceramic filter element having an inlet end; means for regenerating said ceramic filter element including means for igniting said particulates near the inlet end of said ceramic filter element; primary flow means for providing combustible gases including oxygen upstream from said ceramic filter element for ignition and subsequent sustained combustion of said particulates; and secondary flow means for diluting said oxygen thereby slowing said combustion, said secondary flow means including means for directing combustion gases from downstream of said ceramic filter element to upstream of said ceramic filter element.
Claim 2
Dependent Claim
140 words
Cleaning apparatus for exhaust gases from an engine, comprising: a housing having an inlet, an outlet, and a fluid flow path leading from said inlet upstream to said outlet downstream; means, within said housing along said fluid flow path, for filtering particulates from said exhaust gases, said filtering means including a ceramic filter element having an inlet end; means for regenerating said ceramic filter element including means for igniting said particulates near the inlet end of said ceramic filter element; primary flow means for providing combustible gases including oxygen upstream from said ceramic filter element for ignition and subsequent sustained combustion of said particulates; and secondary flow means for diluting said oxygen thereby slowing said combustion, said secondary flow means including means for directing combustion gases from downstream of said ceramic filter element to upstream of said ceramic filter element.
Claim 3
Dependent Claim
24 words
Apparatus in accordance with claim 1, wherein said primary flow means includes means for aspirating said combustion gases to combine with said combustible gases.
Claim 4
Dependent Claim
31 words
Apparatus in accordance with claim 2, wherein said secondary flow means further includes valve means for controlling volume rate of combustion gases combined at said aspirating means with said combustible gases.
Claim 5
Dependent Claim
33 words
Apparatus in accordance with claim 1, wherein said directing means includes valve means for preventing bypass of exhaust gases from upstream of said ceramic filter element to downstream of said ceramic filter element.
Claim 6
Dependent Claim
124 words
Cleaning apparatus for exhaust gases from an engine, comprising: a housing having an inlet, an outlet and a fluid flow path leading from said inlet upstream to said outlet downstream; means, within said housing long said fluid flow path, for filtering particulates from said exhaust gases, said filtering means including a ceramic filter element having an inlet end; means for regenerating said ceramic filter element including means for igniting said particulates near the inlet end of said ceramic filter element; means for injecting combustible gases including oxygen upstream from said ceramic filter element for ignition and subsequent sustained combustion of said particulates; and means for recirculating combustion gases and heat from downstream of said ceramic filter element to upstream of said ceramic filter element.
Claim 7
Dependent Claim
124 words
Cleaning apparatus for exhaust gases from an engine, comprising: a housing having an inlet, an outlet and a fluid flow path leading from said inlet upstream to said outlet downstream; means, within said housing long said fluid flow path, for filtering particulates from said exhaust gases, said filtering means including a ceramic filter element having an inlet end; means for regenerating said ceramic filter element including means for igniting said particulates near the inlet end of said ceramic filter element; means for injecting combustible gases including oxygen upstream from said ceramic filter element for ignition and subsequent sustained combustion of said particulates; and means for recirculating combustion gases and heat from downstream of said ceramic filter element to upstream of said ceramic filter element.
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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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |