US4536375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of gases
Assignee: MP United Drug Co Ltd
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Filing: 1983-10-18
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Granted: 1985-08-20
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Expires: 2003-10-18
Abstract
Abstract A carbon monoxide-contaminated breathable gas (that is a gas or gas mixture containing sufficient oxygen to support human life) is purified by bringing it into contact with a bed of a catalyst, whereby to oxidize carbon monoxide to carbon dioxide and reduce the carbon monoxide contamination of gas, the catalyst being a promoted tin IV oxide-support precious metal catalyst in which the promoter is one or more metals of group 1b, 3b, 7bb and 8 of the Periodic Table (especially copper, nickel, manganese, silica or lanthanum) and the precious metal is platinum, palladium, rhodium, iridium or ruthenium.
Inventors
- 👤 Andrew Holt
- 👤 David W. White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:53
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/8986; A; A62; A62B; A62B19/00; A62B19/02; A62D; A62D9/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/656; B01J23/6562; B01J23/62; B01J23/622; B01J23/626
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A method of reducing the carbon monoxide content of a carbon monoxide-contaminated breathable gas by bringing the contaminated gas into contact with a bed of catalyst, whereby to oxidise carbon monoxide in the gas to carbon dioxide, in which method the catalyst comprises a promoted tin IV oxide-supported precious metal catalyst, the promoter being one or more metals of group 1b, 3b, 7b and 8 of the Periodic Table and the precious metal being platinum, palladium, rhodium, iridium or ruthenium.
Claim 2
Independent Claim
80 words
A method of reducing the carbon monoxide content of a carbon monoxide-contaminated breathable gas by bringing the contaminated gas into contact with a bed of catalyst, whereby to oxidise carbon monoxide in the gas to carbon dioxide, in which method the catalyst comprises a promoted tin IV oxide-supported precious metal catalyst, the promoter being one or more metals of group 1b, 3b, 7b and 8 of the Periodic Table and the precious metal being platinum, palladium, rhodium, iridium or ruthenium.
Claim 3
Dependent Claim
18 words
A method as claimed in claim 1 in which the promoter is copper, nickel, manganese, silver or lanthanum.
Claim 4
Dependent Claim
28 words
A method as claimed in claim 1 in which the catalyst contains from 0.1 to 5% by weight of promoter, based on the weight of tin IV oxide.
Claim 5
Dependent Claim
33 words
A method as claimed in claim 3 in which the catalyst contains from 0.1 to 2%, preferably from 0.3 to 0.8%, by weight of promoter, based on the weight of tin IV oxide.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 4 in which the catalyst contains from 0.3 to 0.8% by weight of promoter, based on the weight of tin IV oxide.
Claim 7
Dependent Claim
42 words
A method as claimed in claim 1 in which the catalyst contains up to 5% by weight of each precious metal, to a total of from 1 to 10% by weight of precious metal, based on the weight of tin IV oxide.
Claim 8
Dependent Claim
37 words
A method as claimed in claim 6 in which the catalyst contains, as precious metals, platinum and/or palladium, each in an amount of from 0.5 to 5% by weight, based on the weight of tin IV oxide.
Claim 9
Dependent Claim
41 words
A method as claimed in claim 7 in which the precious metal component of the catalyst comprises a mixture of platinum and palladium in a total of from 3 to 5% by weight, based on the weight of tin IV oxide.
Claim 10
Dependent Claim
25 words
A method as claimed in claim 1 in which the contaminated gas contains moisture and is dried before being brought into contact with the catalyst.
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) | 1988-08-19 | 1989-02-18 | 1989-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-19 | 1993-02-18 | 1993-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-19 | 1997-02-18 | 1997-08-20 | $7700.00 | Window Closed / Lapsed |