US3959865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of containing a resiliently supported rigid ceramic catalyst support
Assignee: 3M Co
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Filing: 1974-09-09
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Granted: 1976-06-01
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Expires: 1994-09-09
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
2026-11-05 05:48
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; F01N3/2867; 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: 6
Claim 1
Independent Claim
90 words
Process for mounting a rigid ceramic catalyst support in a metallic casing, said catalyst support and casing having different coefficients of thermal expansion, comprising, 1. interposing between said support and said casing at least one ply of thermally insulating, resilient, inorganic bonded refractory fiber sheet material so that there is open space on one side thereof, 2. providing a foamable inorganic composition in said open space, and thereafter 3. effecting foaming of said inorganic composition at elevated temperatures whereby said catalyst support is securely and resiliently retained in said casing.
Claim 2
Dependent Claim
90 words
Process for mounting a rigid ceramic catalyst support in a metallic casing, said catalyst support and casing having different coefficients of thermal expansion, comprising, 1. interposing between said support and said casing at least one ply of thermally insulating, resilient, inorganic bonded refractory fiber sheet material so that there is open space on one side thereof, 2. providing a foamable inorganic composition in said open space, and thereafter 3. effecting foaming of said inorganic composition at elevated temperatures whereby said catalyst support is securely and resiliently retained in said casing.
Claim 3
Dependent Claim
22 words
Process according to claim 1 wherein constraining means are provided during the foaming step whereby pressure exerted by the foam is increased.
Claim 4
Dependent Claim
14 words
Process according to claim 1 wherein the rigid ceramic catalyst support includes platinum catalyst.
Claim 5
Dependent Claim
19 words
Process according to claim 1 wherein the rigid catalyst support contains catalyst for oxidation of carbon monoxide or hydrocarbons.
Claim 6
Dependent Claim
17 words
Process according to claim 1 wherein the rigid catalyst support contains catalyst for reduction of nitrogen oxides.
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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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |