US3944505A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic structure
Assignee: Comptoir Lyon-Alemand Louyot and Cie
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Filing: 1974-07-22
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Granted: 1976-03-16
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Expires: 1994-07-22
Abstract
Abstract A catalytic device is made up of a stack of expanded metal sheets held spaced apart by wires between the sheets. The assembly is welded together to form a rigid block and the expanded metal sheets having a coating of metal aluminide covered with alpha alumina which in turn has a catalytic surface thereon.
Inventors
- 👤 Roger Claude LaCroix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:29
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/28; F01N3/2839; F01N3/2853; B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J; B01J23/00; B01J23/70; B01J23/74; B01J37/00; B01J37/02; B01J37/024; B01J37/0244; F01N3/2803; F01N3/2807; F01N3/281; F01N3/2817; F01N2330/00; F01N2330/02; F01N3/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A catalytic structure comprising: a stack of expanded metal sheets arranged in generally parallel relation and spaced apart a distance of about 0.5 to 2.5 mm, the transparency of each sheet being from 20 to 80% and the thickness of the sheets before expansion being from 0.05 to 0.25 mm; means holding said sheets in said spaced relation in the form of a rigid block; and each sheet having thereon a layer of at least one metal aluminide, wherein the metal of said metal aluminide is selected from the group consisting of nickel and cobalt, said metal aluminide layer being covered with a layer of alpha alumina supporting a catalytic surface layer of platinum.
Claim 2
Dependent Claim
114 words
A catalytic structure comprising: a stack of expanded metal sheets arranged in generally parallel relation and spaced apart a distance of about 0.5 to 2.5 mm, the transparency of each sheet being from 20 to 80% and the thickness of the sheets before expansion being from 0.05 to 0.25 mm; means holding said sheets in said spaced relation in the form of a rigid block; and each sheet having thereon a layer of at least one metal aluminide, wherein the metal of said metal aluminide is selected from the group consisting of nickel and cobalt, said metal aluminide layer being covered with a layer of alpha alumina supporting a catalytic surface layer of platinum.
Claim 3
Dependent Claim
22 words
A structure as defined in claim 1 wherein said means holding said sheets in spaced relation include wires extending between adjacent sheets.
Claim 4
Dependent Claim
15 words
A structure as defined in claim 2 wherein said sheets and wires are welded together.
Claim 5
Dependent Claim
45 words
A structure as defined in claim 1 wherein the transparency of said sheets is from 45 to 60%, wherein their openings have a largest diagonal dimension of from 1.2 to 4 mm, and wherein the spacing between said sheets is from 0.1 to 0.4 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |