US5538698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heater and catalytic converter
Assignee: NGK Insulators Ltd
•
Filing: 1993-11-16
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Granted: 1996-07-23
•
Expires: 2013-11-16
Abstract
Abstract A heater is composed of (a) a honeycomb structure having a large number of passages, (b) an adsorbent composed mainly of zeolite or an adsorbent-catalyst composition comprising adsorbent and a catalyst component supported on the adsorbent, the adsorbent or adsorbent-catalyst composition being coated on the honeycomb structure, and (c) at least two electrodes fixed to the honeycomb structure for electrification of the honeycomb structure, wherein a gas is flowed through the passages in the honeycomb structure and is heated. A catalytic converter has at least one main monolith catalyst and the above heater provided upstream or downstream of the main monolith catalyst or between two main monolith catalysts. A catalytic converter for purification of automobile exhaust gas, has (a) at least one main monolith catalyst, (b) a honeycomb heater comprising a honeycomb structure having a large number of passages and at least two electrodes for electrification fixed to the honeycomb structure, and (c) an adsorbent composed mainly of zeolite. Each of the at least one main monolith catalyst (a), the honeycomb heater (b) and the adsorbent (c) being provided in the exhaust gas system of an automobile.
Inventors
- 👤 Fumio Abe
- 👤 Keiji Noda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:48
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; B01D53/9481; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/46; B01J35/00; B01J35/30; B01J35/33; B01J35/50; B01J35/56; B01J35/57; F; F01; F01N; F01N13/00; F01N13/009; F01N3/00; F01N3/08; F01N3/0807; F01N3/0814; F01N3/0828; F01N3/0835; F01N3/10; F01N3/18; F01N3/20; F01N3/2006; F01N3/2013; F01N3/2026; F01N3/24; F01N3/28; F01N3/2803; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/141; B01J2229/00; B01J2229/30; B01J2229/42; F01N2240/00; F01N2240/16; F01N2250/00; F01N2250/12; F01N2330/00; F01N2330/02; F01N2330/06; F01N2330/14; F01N2370/00; F01N2370/02; F01N2370/04; F01N2370/22; F01N2370/24; F01N2510/00; F01N2510/06; F01N2510/063; F01N2570/00; F01N2570/16; F01N3/30; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
69 words
A catalytic converter, comprising: at least one main catalyst; and a heater provided upstream or downstream of the main catalyst or between two main catalysts, said heater including (a) a honeycomb structure having a plurality of passages, (b) an adsorbent comprised mainly of zeolite, said adsorbent being coated on the honeycomb structure, and (c) at least two electrodes fixed to the honeycomb structure for electrification of the honeycomb structure.
Claim 2
Dependent Claim
69 words
A catalytic converter, comprising: at least one main catalyst; and a heater provided upstream or downstream of the main catalyst or between two main catalysts, said heater including (a) a honeycomb structure having a plurality of passages, (b) an adsorbent comprised mainly of zeolite, said adsorbent being coated on the honeycomb structure, and (c) at least two electrodes fixed to the honeycomb structure for electrification of the honeycomb structure.
Claim 3
Dependent Claim
15 words
The catalytic converter of claim 1, further comprising a resistance-adjusting means provided between the electrodes.
Claim 4
Dependent Claim
15 words
The catalytic converter of claim 2, wherein the resistance-adjusting means comprises at least one slit.
Claim 5
Dependent Claim
22 words
The catalytic converter of claim 1, wherein said zeolite is a high-silica zeolite having an Si/Al ratio of not less than 40.
Claim 6
Dependent Claim
15 words
The catalytic converter of claim 1, wherein said heater is provided between two main catalysts.
Claim 7
Dependent Claim
81 words
A catalytic converter, comprising: at least one main catalyst; and a heater provided upstream or downstream of the main catalyst or between two main catalysts, said heater including (a) a honeycomb structure comprising a plurality of passages, (b) an adsorbent-catalyst composition coated on the honeycomb structure, said adsorbent-catalyst composition comprising an adsorbent comprised mainly of zeolite and a catalyst component supported on the adsorbent, and (c) at least two electrodes fixed to the honeycomb structure for electrification of the honeycomb structure.
Claim 8
Dependent Claim
81 words
A catalytic converter, comprising: at least one main catalyst; and a heater provided upstream or downstream of the main catalyst or between two main catalysts, said heater including (a) a honeycomb structure comprising a plurality of passages, (b) an adsorbent-catalyst composition coated on the honeycomb structure, said adsorbent-catalyst composition comprising an adsorbent comprised mainly of zeolite and a catalyst component supported on the adsorbent, and (c) at least two electrodes fixed to the honeycomb structure for electrification of the honeycomb structure.
Claim 9
Dependent Claim
14 words
The catalytic converter of claim 6, further comprising resistance-adjusting means provided between the electrodes.
Claim 10
Dependent Claim
15 words
The catalytic converter of claim 7, wherein said resistance-adjusting means comprises at least one slit.
Claim 11
Dependent Claim
22 words
The catalytic converter of claim 6, wherein said zeolite is a high-silica zeolite having an Si/Al ratio of not less than 40.
Claim 12
Dependent Claim
55 words
The catalytic converter of claim 9, wherein said zeolite is ion-exchanged with at least one noble metal selected from the group consisting of Pt, Pd, Rh, Ir and Ru, said adsorbent-catalyst composition further comprising a heat-resistant oxide containing at least one noble metal selected from the group consisting of Pt, Pd, Rh, Ir and Ru.
Claim 13
Dependent Claim
15 words
The catalytic converter of claim 6, wherein said heater is provided between two main catalysts.
Claim 14
Dependent Claim
88 words
A catalytic converter for purification of automobile exhaust gas, comprising: at least one main catalyst; a honeycomb heater comprised of a honeycomb structure having a large number of passages and at least two electrodes fixed to the honeycomb structure for electrification of the honeycomb structure; and an adsorbent structure provided separately from said honeycomb heater, said adsorbent structure being comprised mainly of zeolite, wherein said at least one main monolith catalyst, said honeycomb heater and said adsorbent structure are provided in an exhaust gas system of an automobile.
Claim 15
Dependent Claim
88 words
A catalytic converter for purification of automobile exhaust gas, comprising: at least one main catalyst; a honeycomb heater comprised of a honeycomb structure having a large number of passages and at least two electrodes fixed to the honeycomb structure for electrification of the honeycomb structure; and an adsorbent structure provided separately from said honeycomb heater, said adsorbent structure being comprised mainly of zeolite, wherein said at least one main monolith catalyst, said honeycomb heater and said adsorbent structure are provided in an exhaust gas system of an automobile.
Claim 16
Dependent Claim
15 words
The catalytic converter of claim 12, further comprising a catalyst supported on the honeycomb heater.
Claim 17
Dependent Claim
23 words
The catalytic converter of claim 13, wherein the honeycomb heater is provided in a furthermost downstream position in the automobile exhaust gas system.
Claim 18
Dependent Claim
55 words
The catalytic converter of claim 12, further comprising at least one of (a) an adsorbent composition comprised mainly of zeolite, and (b) an adsorbent-catalyst composition comprised mainly of zeolite and a catalyst component supported on said zeolite, said at least one of said adsorbent composition and said adsorbent-catalyst composition being supported on said honeycomb heater.
Claim 19
Dependent Claim
32 words
The catalytic converter of claim 15, wherein said adsorbent-catalyst composition is supported on said honeycomb heater, said honeycomb heater being provided in a furthermost downstream position in the automobile exhaust gas system.
Claim 20
Dependent Claim
23 words
The catalytic converter of claim 12, wherein the main catalyst is provided in a furthermost downstream position in the automobile exhaust gas system.
Claim 21
Dependent Claim
19 words
The catalytic converter of claim 12, further comprising a resistance-adjusting means provided between the electrodes of the honeycomb heater.
Claim 22
Dependent Claim
22 words
The catalytic converter of claim 12, wherein said zeolite is a high-silica zeolite having an Si/Al ratio of not less than 40.
Claim 23
Dependent Claim
15 words
The catalytic converter of claim 12, further comprising a catalyst supported on the adsorbent structure.
Claim 24
Dependent Claim
17 words
The catalytic converter of claim 26, further comprising a catalyst which is supported on said honeycomb heater.
Claim 25
Dependent Claim
23 words
The catalytic converter of claim 21, wherein said honeycomb heater is provided in a furthermost downstream position in the automobile exhaust gas system.
Claim 26
Dependent Claim
52 words
The catalytic converter of claim 20, further comprising at least one of (a) an adsorbent composition comprised mainly of zeolite and (b) an adsorbent-catalyst composition comprised mainly of zeolite and a catalyst component supported thereon, at least one of said adsorbent composition and said adsorbent-catalyst composition being supported on the honeycomb heater.
Claim 27
Dependent Claim
32 words
The catalytic converter of claim 23, wherein the adsorbent-catalyst composition is supported on said honeycomb heater, said honeycomb heater being provided in a furthermost downstream position of the automobile exhaust gas system.
Claim 28
Dependent Claim
29 words
The catalytic converter of claim 26, wherein one of the main catalyst and the adsorbent structure is provided in a furthermost downstream position of the automobile exhaust gas system.
Claim 29
Dependent Claim
18 words
The catalytic converter of claim 20, further comprising resistance-adjusting means provided between the electrodes of the honeycomb heater.
Claim 30
Dependent Claim
21 words
The catalytic converter of claim 20, wherein the zeolite is high-silica zeolite having an Si/Al ratio of not less than 40.
Claim 31
Dependent Claim
69 words
The catalytic converter of claim 20, wherein said catalyst comprises (a) a high-silica zeolite having an Si/Al ratio of not less than 40, said high-silica zeolite being ion-exchanged with at least one noble metal selected from the group consisting of Pt, Pd, Rh, Ir and Ru, and (b) a heat-resistance oxide containing at least one noble metal selected from the group consisting of Pt, Pd, Rh, Ir and Ru.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |