Patent US4394925A successfully refreshed from Google Patents.
EP0766993A2
Expired / Lapsed
EP
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Filter for purifying exhaust gases
Assignee: Toyota Motor Corp
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Filing: 1996-09-24
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Granted: —
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Expires: 2016-09-24
Abstract
Abstract A wall-flow type filter for purifying exhaust gases having a number of cells formed in a direction of flow of exhaust gases, wherein every other cell is plugged on the exhaust gas inlet side but is opened on the exhaust gas outlet side, and the cells that are opened on the exhaust gas inlet side are plugged on the exhaust gas outlet side, and wherein a catalyst is carried in the pores formed in the porous walls among the cells. <IMAGE>
Inventors
- 👤 Yasushi Araki
- 👤 Tatsuji Mizuno
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 23:09
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2418; B01D46/2425; B01D46/2429; B01D46/0027; B01D46/0036; B01D46/24492; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0222; F01N3/08; F01N3/0807; F01N3/0814; F01N3/0821; F01N3/0828; F01N3/0835; F01N3/0842; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N3/2828; B01D2255/00; B01D2255/90; B01D2255/91; B01D2255/912; F01N2250/00; F01N2250/12; F01N2250/14; F01N2510/00; F01N2510/06; F01N2570/00; F01N2570/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A wall-flow type filter for purifying exhaust gases having a number of cells formed in a direction of flow of exhaust gases, wherein every other cell is plugged on the exhaust gas inlet side but is opened on the exhaust gas outlet side, and the cells that are opened on the exhaust gas inlet side are plugged on the exhaust gas outlet side, and wherein a catalyst is carried in the pores formed in the porous walls between the cells.
Claim 2
Dependent Claim
40 words
A wall-flow type filter for purifying exhaust gases according to claim 1, wherein the diameter of the pores decreases from the exhaust gas inlet side toward the exhaust gas outlet side in the direction of thickness of the porous walls.
Claim 3
Dependent Claim
42 words
A wall-flow type filter for purifying exhaust gases according to claim 1 or 2, wherein the amount of the carrier increases from the exhaust gas inlet side toward the exhaust gas outlet side in the direction of thickness of the porous walls.
Claim 4
Dependent Claim
46 words
A filter for purifying exhaust gases according to any one of claims 1 to 3, wherein an NO x -absorbing material that releases NO x components absorbed in the form of NO 2 at a temperature higher than a predetermined temperature, is carried in said pores.
Claim 5
Dependent Claim
68 words
A wall-flow type filter for purifying exhaust gases according to any one of claims 1 to 4, wherein an HC-adsorbing material that releases the adsorbed HC at a temperature higher than a predetermined temperature is applied to the pores near the exhaust gas inlets in the direction of thickness of the porous walls or onto the porous wall surfaces in the cells on the exhaust gas inlet side.
Claim 6
Dependent Claim
37 words
A wall-flow type filter for purifying exhaust gases according to any one of claims 1 to 5, wherein an oxidizing catalyst is carried on the porous wall surfaces of the cells on the exhaust gas outlet side.
References Cited (Backward Citations)
No citation records indexed.
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