Patent US3992331A successfully refreshed from Google Patents.
US3992331A
Expired / Lapsed
US
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Catalytic platinum metal particles on a substrate and method of preparing the catalyst
Assignee: Prototech Inc
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Filing: 1974-12-20
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Granted: 1976-11-16
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Expires: 1994-12-20
Abstract
Abstract This disclosure deals with novel very fine, particulated colloidal platinum of the 15-25 Angstrom size range of unusual catalytic activity and particularly adapted for adsorption upon various substrate for use as catalytic structures and the like, and produced from a new platinum sulfite acid and a sol derived therefrom.
Inventors
- 👤 Henry G. Petrow
- 👤 Robert J. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:26
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; H01M4/925; H01M4/926; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J35/00; B01J35/30; B01J35/391; B01J35/393; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
64 words
In a method of preparing a catalytic structure suitable for high-temperature operation, the steps of applying a complex platinum sulfite acid having the empirical formula H 3 Pt(SO 3 ) 2 OH to a substrate, thermally decomposing said applied acid in air, and reducing the decomposed acid to form platinum metal particles having an average particle size of the order of substantially 15-25 Angstroms.
Claim 2
Dependent Claim
64 words
In a method of preparing a catalytic structure suitable for high-temperature operation, the steps of applying a complex platinum sulfite acid having the empirical formula H 3 Pt(SO 3 ) 2 OH to a substrate, thermally decomposing said applied acid in air, and reducing the decomposed acid to form platinum metal particles having an average particle size of the order of substantially 15-25 Angstroms.
Claim 3
Dependent Claim
29 words
A method in accordance with claim 1, wherein said acid is formed by reacting an aqueous solution of a substantially sulfite-free platinum acid or salt with a sulfiting agent.
Claim 4
Dependent Claim
33 words
A method in accordance with claim 2, wherein said platinum acid is hydroxyplatinic acid and said platinum salt is sodium chloroplatinate and said sulfiting agent is one of sodium bisulfite and sulfurous acid.
Claim 5
Dependent Claim
82 words
In a method of preparing a catalytic structure suitable for high-temperature operation, the steps of thermally decomposing in air a complex platinum sulfite acid having the empirical formula H 3 Pt(SO 3 ) 2 OH, dispersing said decomposed acid in water to form a colloidal platinum-containing sol, applying said sol to a substrate, and reducing the decomposed acid in the applied sol, thereby depositing on said substrate platinum metal particles having an average particle size of the order of substantially 15-25 Angstroms.
Claim 6
Dependent Claim
82 words
In a method of preparing a catalytic structure suitable for high-temperature operation, the steps of thermally decomposing in air a complex platinum sulfite acid having the empirical formula H 3 Pt(SO 3 ) 2 OH, dispersing said decomposed acid in water to form a colloidal platinum-containing sol, applying said sol to a substrate, and reducing the decomposed acid in the applied sol, thereby depositing on said substrate platinum metal particles having an average particle size of the order of substantially 15-25 Angstroms.
Claim 7
Dependent Claim
29 words
A method in accordance with claim 4, wherein said acid is formed by reacting an aqueous solution of a substantially sulfite-free platinum acid or salt with a sulfiting agent.
Claim 8
Dependent Claim
33 words
A method in accordance with claim 5, wherein said platinum acid is hydroxyplatinc acid and said platinum salt is sodium chloroplatinate and said sulfiting agent is one of sodium bisulfite and sulfurous acid.
Claim 9
Dependent Claim
60 words
A chloride-free catalytic structure suitable for high-temperature operation, comprising a substrate having adsorbed thereon platinum metal particles substantially all of the order of substantially 15-25 Angstroms in particle size derived from the thermal decomposition in air and subsequent reduction to platinum metal particles of a complex platinum sulfite acid having the empirical formula H 3 Pt(SO 3 ) 2 OH.
Claim 10
Dependent Claim
60 words
A chloride-free catalytic structure suitable for high-temperature operation, comprising a substrate having adsorbed thereon platinum metal particles substantially all of the order of substantially 15-25 Angstroms in particle size derived from the thermal decomposition in air and subsequent reduction to platinum metal particles of a complex platinum sulfite acid having the empirical formula H 3 Pt(SO 3 ) 2 OH.
References Cited (Backward Citations)
US3531329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-16 | 1980-05-17 | 1980-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-16 | 1984-05-17 | 1984-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-16 | 1988-05-17 | 1988-11-16 | $7700.00 | Window Closed / Lapsed |