Patent US5699431A successfully refreshed from Google Patents.
Patent US4289855A successfully refreshed from Google Patents.
US4289855A
Expired / Lapsed
US
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Safety catalyst systems
Assignee: Oxoid Ltd
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Filing: 1978-12-19
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Granted: 1981-09-15
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Expires: 1998-12-19
Abstract
Abstract Safety catalyst systems and their use in chemical reactions carried out in the gas phase, wherein the safety catalyst system comprises pelleted catalyst held loose in and throughout the holes and folds of a folded or rolled up metal foil net which is inside a container having holes for the inflow and outflow of gases. The safety catalyst system of the invention does not allow the formation of localized hot-spots or allow free catalyst dust to escape from the system, both of which are known disadvantages of prior art systems.
Inventors
- 👤 Donald C. Whitley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:28
CPC Classifications
C; C01; C01B; C01B5/00; C12; C12M; C12M41/00; C12M41/30; C12M41/34; Y; Y10; Y10S; Y10S435/00; Y10S435/801
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
In a system comprising an anaerobic jar containing an explosive mixture of oxygen and hydrogen and a catalytic device for catalyzing a reaction between the oxygen and hydrogen, the improvement wherein said catalytic device comprises: a container having holes for the inflow and outflow of gases, a metal foil net folded or rolled up inside said container, and a pelleted catalyst held loose in and throughout the holes and folds of said metal foil net, the ratio of metal foil net to catalyst being not less than 0.75:1 by weight, whereby said metal foil net constitutes a heat-sink material which, by preventing the formation of localized hotspots, reduces the risk of an explosion between the oxygen and hydrogen.
Claim 2
Dependent Claim
118 words
In a system comprising an anaerobic jar containing an explosive mixture of oxygen and hydrogen and a catalytic device for catalyzing a reaction between the oxygen and hydrogen, the improvement wherein said catalytic device comprises: a container having holes for the inflow and outflow of gases, a metal foil net folded or rolled up inside said container, and a pelleted catalyst held loose in and throughout the holes and folds of said metal foil net, the ratio of metal foil net to catalyst being not less than 0.75:1 by weight, whereby said metal foil net constitutes a heat-sink material which, by preventing the formation of localized hotspots, reduces the risk of an explosion between the oxygen and hydrogen.
Claim 3
Dependent Claim
27 words
The improvement according to claim 1 wherein the metal foil net constitutes a heat-sink material which prevents a temperature rise above 150° C. within said anaerobic jar.
Claim 4
Dependent Claim
31 words
The improvement according to claim 1, wherein the metal foil net is formed from a metal sheet punched with slots of length of about 0.5 to 2 cm and then expanded.
Claim 5
Dependent Claim
15 words
The improvement according to claim 3, wherein the slots are about 1 cm in length.
Claim 6
Dependent Claim
14 words
The improvement according to claim 3, wherein the metal sheet is made of aluminium.
Claim 7
Dependent Claim
26 words
The improvement according to claim 1, wherein the container is in the form of a bag, sachet or envelope formed from steel gauze or fine mesh.
Claim 8
Dependent Claim
20 words
The improvement according to claim 6, wherein the steel gauze or fine mesh has spark shield or flame retardant properties.
Claim 9
Dependent Claim
17 words
The improvement according to claim 1, wherein the pelleted catalyst is palladium metal coated on alumina pellets.
Claim 10
Dependent Claim
11 words
The improvement according to claim 8, wherein the pellets are spherical.
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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) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |