Patent US1548773A successfully refreshed from Google Patents.
Patent US5474745A successfully refreshed from Google Patents.
US5474745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic converter for purifying exhaust gas
Assignee: Toyota Central R&D Labs Inc
•
Filing: 1994-09-12
•
Granted: 1995-12-12
•
Expires: 2014-09-12
Abstract
Abstract An apparatus for efficiently purifying NOx in the exhaust gas or soluble organic substance in the exhaust gas from a diesel engine. A plurality of purification units are arranged in a housing, each of which is composed of a catalytic layer for reducing NOx and a cooling core for cooling the exhaust gas admitted through the catalytic layer. The multi-staged purification units are so constructed to admit the exhaust gas to flow therethrough. The catalytic layer in the form of a porous carrier such as a honeycomb structure carries catalytic components. Upon purifying soluble organic substance in the exhaust gas from a diesel engine, the catalytic components carried on the catalytic layer serve to efficiently purify such substance, as well as inhibiting the reaction to form sulfate.
Inventors
- 👤 Masayuki Fukui
- 👤 Koji Yokota
- 👤 Yutaka Yokoi
- 👤 Yujiro Oshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:47
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2046; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9431; F01N13/00; F01N13/011; F01N3/24; F01N3/28; F01N3/2882; F01N3/2889; B01J; B01J35/00; B01J35/50; B01J35/56; F01N2240/00; F01N2240/18; F01N2250/00; F01N2250/12; F01N2260/00; F01N2260/02; F01N2260/022; F01N2570/00; F01N2570/04; F01N2570/12; F01N2570/14; F01N2610/00; F01N2610/04; F01N3/02; F01N3/206; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
66 words
A catalytic converter for exhaust gas NOx purification comprising a plurality of purification units serially arranged in a housing, each of which comprises a catalytic layer for reducing NOx and a separate cooling core without catalyst for cooling exhaust gas admitted through said catalytic layer, through which said exhaust gas flows sequentially, wherein said cooling core transfers heat from said exhaust gas to outside said converter.
Claim 2
Dependent Claim
66 words
A catalytic converter for exhaust gas NOx purification comprising a plurality of purification units serially arranged in a housing, each of which comprises a catalytic layer for reducing NOx and a separate cooling core without catalyst for cooling exhaust gas admitted through said catalytic layer, through which said exhaust gas flows sequentially, wherein said cooling core transfers heat from said exhaust gas to outside said converter.
Claim 3
Dependent Claim
33 words
The catalytic converter for NOx purification as in claim 1 wherein an oxidation catalytic layer for oxidizing hydrocarbons in exhaust gas is provided on the downstream side of said plurality of purification units.
Claim 4
Dependent Claim
34 words
The catalytic converter for NOx purification as in claim 2, wherein said catalytic component of said oxidation catalytic layer is one or more materials selected from the group consisting of platinum, palladium and rhodium.
Claim 5
Dependent Claim
28 words
The catalytic converter for NOx purification as in claim 1 wherein said catalytic layer is composed of catalytic component and a porous carrier which carries said catalytic component.
Claim 6
Dependent Claim
33 words
The catalytic converter for NOx purification as in claim 4, wherein said catalytic component is one or more kinds of materials selected from the group consisting of platinum, palladium, rhodium, copper, and nickel.
Claim 7
Dependent Claim
38 words
The catalytic converter for NOx purification as in claim 4, wherein said porous carrier is one or more structures selected from the group consisting of ceramic or metal honeycomb, metal wire netting, and perforated metal with air slits.
Claim 8
Dependent Claim
23 words
The catalytic converter for NOx purification as in claim 1, wherein said catalytic layer has a thickness ranging from 1 to 20 mm.
Claim 9
Dependent Claim
36 words
The catalytic converter for NOx purification as in claim 1, wherein said cooling core comprises one or more structures selected from the group consisting of metal honeycomb, metal wire netting, and perforated metal with air slits.
Claim 10
Dependent Claim
32 words
The catalytic converter for NOx purification as in claim 1, wherein said cooling core is one or more materials selected from the group consisting of stainless steel, heat-resistance steel, copper, and aluminum.
Claim 11
Dependent Claim
24 words
The catalytic converter for NOx purification as in claim 1, wherein said housing is provided with a plurality of fins on its outer periphery.
Claim 12
Dependent Claim
37 words
The catalytic converter for NOx purification as in claim 1, wherein the amount of said catalytic component carried on each of said catalytic layer is incremented from upstream to downstream along the flow of said exhaust gas.
Claim 13
Dependent Claim
31 words
The catalytic converter for NOx purification as in claim 1, wherein a space is provided between said catalytic layers and said cooling cores which ranges from 4 mm to 20 mm.
Claim 14
Dependent Claim
19 words
The catalytic converter for NO x purification as in claim 1, further comprising means for introducing a reducing agent.
Claim 15
Dependent Claim
80 words
A catalytic converter for purifying exhaust gas, comprising a plurality of purification units serially arranged in a housing, each of which comprises an exhaust oxidation catalytic layer for oxidizing a soluble organic substance in exhaust gas from a diesel engine, and a separate cooling core without catalyst for cooling said exhaust gas admitted through said exhaust oxidation catalytic layer, through which said exhaust gas flows sequentially, wherein said cooling core transfers heat from said exhaust gas to outside said converter.
Claim 16
Dependent Claim
80 words
A catalytic converter for purifying exhaust gas, comprising a plurality of purification units serially arranged in a housing, each of which comprises an exhaust oxidation catalytic layer for oxidizing a soluble organic substance in exhaust gas from a diesel engine, and a separate cooling core without catalyst for cooling said exhaust gas admitted through said exhaust oxidation catalytic layer, through which said exhaust gas flows sequentially, wherein said cooling core transfers heat from said exhaust gas to outside said converter.
Claim 17
Dependent Claim
30 words
The catalytic converter for purifying exhaust gas as in claim 14, wherein said exhaust oxidation catalytic layer comprises a catalytic component and a porous carrier which carries said catalytic component.
Claim 18
Dependent Claim
34 words
The catalytic converter for purifying exhaust gas as in claim 14, wherein said catalytic component comprises one or more materials selected from the group consisting of platinum, palladium, rhodium, and transition metals combined therewith.
Claim 19
Dependent Claim
25 words
The catalytic converter for purifying exhaust gas as in claim 14, wherein said catalytic layer has a thickness ranging from 1 mm to 20 mm.
Claim 20
Dependent Claim
63 words
The catalytic converter for purifying exhaust gas as in claim 14, wherein said cooling core comprises one or more structures selected from the group consisting of metal honeycomb, metal wire netting, and perforated metal with air slits, wherein the temperature of exhaust gas within the converter remains below a temperature at which sulfur is converted to sulfate during purification of said exhaust gas.
Claim 21
Dependent Claim
62 words
The catalytic converter for purifying exhaust gas as in claim 14, wherein said cooling core is formed of one or more materials selected from the group consisting of stainless steel, heat resistance steel, copper, and aluminum, wherein the temperature of exhaust gas within the converter remains below a temperature at which sulfur is converted to sulfate during purification of said exhaust gas.
Claim 22
Dependent Claim
25 words
The catalytic converter for purifying exhaust gas as in claim 14, wherein said housing is provided with a plurality of fins on its outer periphery.
Claim 23
Dependent Claim
37 words
The catalytic converter for purifying exhaust gas as in claim 14, wherein the amount of catalytic component carried on each of said catalytic layers is incremented from upstream to downstream along the flow of said exhaust gas.
Claim 24
Dependent Claim
36 words
The catalytic converter for purifying exhaust gas as in claim 14 wherein a space is provided between each of said exhaust oxidation catalytic layers and said cooling cores which ranges from 4 mm to 20 mm.
References Cited (Backward Citations)
US2547916A
Cited
US4175107A
Cited
US4900517A
Cited
US5041270A
Cited
US4843056A
Cited
US5108716A
Cited
US4945721A
Cited
US4948774A
Cited
US4988483A
Cited
US5113653A
Cited
US5346675A
Cited
US5270024A
Cited
US5272871A
Cited
US5302355A
Cited
US5308501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |