US4285909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst assembly for cleaning an exhaust gas
Assignee: Toyota Motor Corp
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Filing: 1980-06-18
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Granted: 1981-08-25
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Expires: 2000-06-18
Abstract
Abstract This invention relates to a catalyst assembly for cleaning an exhaust gas wherein the catalyst and the carrier therefor are secured inside a catalyst muffler by means of expandable ceramic material. This invention also provides a method for making such a catalyst assembly.
Inventors
- 👤 Shinichiro Mizusawa
- 👤 Hideaki Akamatsu
- 👤 Fumiyoshi Noda
- 👤 Yuji Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/16; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2839; F01N3/2853; F01N3/2857; F01N13/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
164 words
An assembly comprising in combination (a) an outer casing in the form of a hollow tube having gas inlet and gas outlet sections, (b) a honeycomb type catalyst unit mounted within said outer casing, the outer walls of said catalyst unit being located a spaced distance inwardly from the interior walls of said outer casing so as to form an annular space therebetween, said catalyst unit having passageways extending therethrough to accommodate the flow of engine exhaust gas into one end and out of the other, (c) a cured cellular ceramic mass completely filling said annular space between said casing and said catalyst unit, said cellular ceramic mass exerting both an outward force toward the interior walls of said casing and an inward force against the exterior walls of said catalyst unit by virtue of the fact that an uncured cellular ceramic mass was introduced into said annular space and then expanded in situ and cured in situ after introduction into said annular space.
Claim 2
Dependent Claim
164 words
An assembly comprising in combination (a) an outer casing in the form of a hollow tube having gas inlet and gas outlet sections, (b) a honeycomb type catalyst unit mounted within said outer casing, the outer walls of said catalyst unit being located a spaced distance inwardly from the interior walls of said outer casing so as to form an annular space therebetween, said catalyst unit having passageways extending therethrough to accommodate the flow of engine exhaust gas into one end and out of the other, (c) a cured cellular ceramic mass completely filling said annular space between said casing and said catalyst unit, said cellular ceramic mass exerting both an outward force toward the interior walls of said casing and an inward force against the exterior walls of said catalyst unit by virtue of the fact that an uncured cellular ceramic mass was introduced into said annular space and then expanded in situ and cured in situ after introduction into said annular space.
Claim 3
Dependent Claim
17 words
An assembly according to claim 1 wherein said casing is in the form of a metal tube.
Claim 4
Dependent Claim
34 words
The assembly of claim 1 in which said cellular ceramic mass is a mixture of heat expanded sodium silicate powders and a constituent selected from the group consisting of "Shirasu balloons", perlite and vermiculite.
Claim 5
Dependent Claim
15 words
The assembly of claim 3 wherein said mixture is in a 1 to 1 ratio.
Claim 6
Dependent Claim
24 words
The assembly of claim 1 in which said cellular ceramic mass is a mixture comprising heat expanded sodium silicate powders and ceramic fiber powders.
Claim 7
Dependent Claim
15 words
The assembly of claim 5 wherein said mixture is in a 1 to 1 ratio.
Claim 8
Dependent Claim
23 words
The assembly of either claim 3 or 5 wherein said sodium silicate powders are also mixed with powders of a light metal hydroxide.
Claim 9
Dependent Claim
20 words
The assembly of claim 1 wherein said outer casing has a plurality of fins extending inwardly into said annular space.
References Cited (Backward Citations)
US3284209A
Cited
US3150988A
Cited
GB962180A
Cited
US3148996A
Cited
US3268350A
Cited
US3211534A
Cited
US3330675A
Cited
US3382082A
Cited
US3574646A
Cited
US3959865A
Cited
US3961907A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |