US3961907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic converter
Assignee: 3M Co
•
Filing: 1972-12-08
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Granted: 1976-06-08
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Expires: 1992-12-08
Abstract
Abstract Refractory catalyst supports are secured in metallic containers having different coefficients of thermal expansion by providing at least one layer of a resilient thermally resistant inorganic sheet material or paper between the support and casing and securing the paper and catalyst support in the container by foaming an inorganic material in the space between the sheet material or paper and catalyst support. A further layer of sheet material or paper may be provided adjacent the support with the foam between the separate layers of sheet material.
Inventors
- 👤 James R. Close
- 👤 William P. Wood
- 👤 Robert A. Hatch
- 👤 James R. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:02
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; F; F01; F01N; F01N13/00; F01N13/009; F01N13/0097; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N3/2825; F01N3/2828; F01N3/2839; F01N3/2853; F01N3/2864; F01N3/2867; F01N2330/00; F01N2330/06; F01N2470/00; F01N2470/22; F01N2470/24; F01N2530/00; F01N2530/02; F01N2530/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49345
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
99 words
A cannister comprising a casing having openings therein for introduction and exhaust of a gas stream, at least one frangible monolithic catalyst support within said casing and spaced therefrom, said catalyst support having passageways therethrough and containing catalyst thereon, said passageways providing open ends aligned with the openings of said casing, and said casing further comprising resilient inorganic sheet material and high temperature resistant cellular foam encircling the girth of said catalyst support within the space between said casing and said catalyst support, said cellular foam exerting pressure firmly securing said sheet material and said catalyst in said casing.
Claim 2
Dependent Claim
99 words
A cannister comprising a casing having openings therein for introduction and exhaust of a gas stream, at least one frangible monolithic catalyst support within said casing and spaced therefrom, said catalyst support having passageways therethrough and containing catalyst thereon, said passageways providing open ends aligned with the openings of said casing, and said casing further comprising resilient inorganic sheet material and high temperature resistant cellular foam encircling the girth of said catalyst support within the space between said casing and said catalyst support, said cellular foam exerting pressure firmly securing said sheet material and said catalyst in said casing.
Claim 3
Dependent Claim
12 words
A canister according to claim 1 wherein the cellular foam is inorganic.
Claim 4
Dependent Claim
15 words
A canister according to claim 2 wherein the cellular foam comprises alumina and aluminum phosphate.
Claim 5
Dependent Claim
36 words
A canister according to claim 1 wherein there are two sheets of resilient inorganic sheet material, one adjacent the casing and the other adjacent the catalyst support and the cellular foam is between the two sheets.
Claim 6
Dependent Claim
14 words
A canister according to claim 1 having a platinum catalyst on the catalyst support.
Claim 7
Dependent Claim
14 words
A cannister according to claim 1 wherein the catalyst support is a ceramic honeycomb.
Claim 8
Dependent Claim
11 words
A canister according to claim 1 wherein the foam is ceramic.
Claim 9
Dependent Claim
50 words
A canister according to claim 1 wherein three frangible monolithic catalyst supports are arranged in series within and spaced apart from the casing, said catalyst supports having resilient inorganic sheet material and high temperature resistant cellular foam encircling them at their girths within the space between them and the casing.
Claim 10
Dependent Claim
22 words
A canister according to claim 1 having cellular foam within the casing overlapping the ends of at least one catalyst support therein.
Claim 11
Dependent Claim
13 words
A canister according to claim 1 having oxidation catalyst on the catalyst support.
Claim 12
Dependent Claim
13 words
A canister according to claim 1 having reducing catalyst on the catalyst support.
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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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |