Patent US4549398A successfully refreshed from Google Patents.
US4549398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas cleaning device for diesel engines
Assignee: Toyota Motor Corp
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Filing: 1982-02-10
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Granted: 1985-10-29
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Expires: 2002-02-10
Abstract
Abstract An exhaust particle cleaning device for a diesel engine includes a trap case provided in a passage way of exhaust gas. A filter material is disposed in the trap case so that carbon particles or other exhaust particles contained in the exhaust gas can be caught within the filter material during the time the exhaust gas is passed through the filter material. A plurality of electric heater elements are spread or dispersed on the upstream end face of the filter material, so that the exhaust gas passes through the areas defined between the plurality of heater elements. The electric heater element may be coated with a ceramic material.
Inventors
- 👤 Kiyohiko Oishi
- 👤 Kiyoshi Kobashi
- 👤 Kenichirou Takama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:57
CPC Classifications
F; F01; F01N; F01N9/00; F01N9/002; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/023; F01N3/027; F01N2390/00; F01N2390/02; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y10; Y10S; Y10S55/00; Y10S55/10; Y10S55/30
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
155 words
An exhaust particle cleaning device for a diesel engine comprising: a trap case provided in a passageway of exhaust gas; a filter material disposed in said trap case so that carbon particles or other exhaust particles contained in the exhaust can be caught within said filter material during the time the exhaust gas is passed through said filter material; a plurality of ceramic heater elements spread or dispersed on the upstream end face of said filter material, so that the exhaust gas passes through the areas between said plurality of ceramic heater elements; each of said ceramic heater elements being formed in the shape of a cross and being arranged so that the shape of the cross is seen from the direction of the exhaust gas flow; each of said ceramic heater elements comprising an electric filament or the like coated with a ceramic material; and means for electrically controlling said plurality of heater elements.
Claim 2
Dependent Claim
155 words
An exhaust particle cleaning device for a diesel engine comprising: a trap case provided in a passageway of exhaust gas; a filter material disposed in said trap case so that carbon particles or other exhaust particles contained in the exhaust can be caught within said filter material during the time the exhaust gas is passed through said filter material; a plurality of ceramic heater elements spread or dispersed on the upstream end face of said filter material, so that the exhaust gas passes through the areas between said plurality of ceramic heater elements; each of said ceramic heater elements being formed in the shape of a cross and being arranged so that the shape of the cross is seen from the direction of the exhaust gas flow; each of said ceramic heater elements comprising an electric filament or the like coated with a ceramic material; and means for electrically controlling said plurality of heater elements.
Claim 3
Dependent Claim
25 words
A device as set forth in claim 1, wherein a catalytic agent is provided on the outer surface of each of said ceramic heater elements.
Claim 4
Dependent Claim
24 words
A device as set forth in claim 1, wherein said means for electrically controlling are adapted and constructed to periodically energize said heater elements.
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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) | 1988-10-28 | 1989-04-29 | 1989-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-28 | 1993-04-29 | 1993-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-28 | 1997-04-29 | 1997-10-29 | $7700.00 | Window Closed / Lapsed |