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US4059541A
Expired / Lapsed
US
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Platinum colloid sol and method of forming same
Assignee: Prototech Inc
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Filing: 1976-05-06
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Granted: 1977-11-22
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Expires: 1996-05-06
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 substrata, and produced from a new platinum sulfite acid and a sol derived therefrom, with novel methods of preparation thereof being disclosed.
Inventors
- 👤 Henry G. Petrow
- 👤 Robert J. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:23
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/92; B; B01; B01J; B01J13/00; B01J13/0004; B01J13/0043; B01J23/00; B01J23/38; B01J23/40; B01J23/42; C; C01; C01G; C01G55/00; H01M4/925; H01M4/926; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0005; H01M2300/0008; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
A method of forming a platinum colloid sol of finely divided particles of average size of substantially 15-25 Angstroms, that comprises, oxidizing, by heating in air to dryness, a complex sulfite acid represented substantially by the empirical formula H 3 Pt(SO 3 ) 2 OH to produce a black, glossy, oxidized material, and dispersing said glossy material in water.
Claim 2
Independent Claim
59 words
A method of forming a platinum colloid sol of finely divided particles of average size of substantially 15-25 Angstroms, that comprises, oxidizing, by heating in air to dryness, a complex sulfite acid represented substantially by the empirical formula H 3 Pt(SO 3 ) 2 OH to produce a black, glossy, oxidized material, and dispersing said glossy material in water.
Claim 3
Independent Claim
157 words
A method of forming a platinum colloid sol of finely divided particles of average size of substantially 15-25 Angstroms, that comprises, adding sodium bisulfite to a substantially neutral solution of sodium chloroplatinate until the pH drops to at least about 4, adding sodium carbonate to bring the pH back to substantially 7 thereby precipitating a complex sodium platinum sulfite salt containing substantially six atoms of sodium and four moles of sulfite per atom of platinum, subjecting said precipiate to strong hydrogen-form ion exchange resin to exchange six atoms of sodium with hydrogen and to liberate substantially two moles of sulfite per atom of platinum thereby producing a solution of a complex platinum sulfite acid comprising substantially two moles of sulfite per atom of platinum, concentrating said complex platinum sulfite acid solution, oxidizing said complex acid by heating the same to dryness in air to produce a black, glossy, oxidized material, and dispersing said glossy material in water.
Claim 4
Independent Claim
157 words
A method of forming a platinum colloid sol of finely divided particles of average size of substantially 15-25 Angstroms, that comprises, adding sodium bisulfite to a substantially neutral solution of sodium chloroplatinate until the pH drops to at least about 4, adding sodium carbonate to bring the pH back to substantially 7 thereby precipitating a complex sodium platinum sulfite salt containing substantially six atoms of sodium and four moles of sulfite per atom of platinum, subjecting said precipiate to strong hydrogen-form ion exchange resin to exchange six atoms of sodium with hydrogen and to liberate substantially two moles of sulfite per atom of platinum thereby producing a solution of a complex platinum sulfite acid comprising substantially two moles of sulfite per atom of platinum, concentrating said complex platinum sulfite acid solution, oxidizing said complex acid by heating the same to dryness in air to produce a black, glossy, oxidized material, and dispersing said glossy material in water.
Claim 5
Independent Claim
121 words
A method of forming a platinum colloid sol of finely divided particles of average size of substantially 15-25 Angstroms, that comprises, subjecting a complex platinum sulfite salt containing substantially six atoms of sodium and four mols of sulfite per atom of platinum to strong hydrogen-form ion exchange resin to exchange six atoms of sodium with hydrogen and to liberate substantially two moles of sulfite per atom of platinum thereby producing a solution of a complex platinum sulfite acid comprising substantially two moles of sulfite per atom of platinum, concentrating said complex platinum sulfite acid solution, oxidizing said complex acid by heating the same to dryness in air to produce a black, glossy, oxidized material, and dispersing said glossy material in water.
Claim 6
Independent Claim
121 words
A method of forming a platinum colloid sol of finely divided particles of average size of substantially 15-25 Angstroms, that comprises, subjecting a complex platinum sulfite salt containing substantially six atoms of sodium and four mols of sulfite per atom of platinum to strong hydrogen-form ion exchange resin to exchange six atoms of sodium with hydrogen and to liberate substantially two moles of sulfite per atom of platinum thereby producing a solution of a complex platinum sulfite acid comprising substantially two moles of sulfite per atom of platinum, concentrating said complex platinum sulfite acid solution, oxidizing said complex acid by heating the same to dryness in air to produce a black, glossy, oxidized material, and dispersing said glossy material in water.
Claim 7
Dependent Claim
35 words
A platinum colloidal sol of finely divided particles of oxidized complex platinum sulfite acid, said particles having an average size of substantially 15-25 Angstroms and being prepared in accordance with the method of claim 1.
Claim 8
Dependent Claim
35 words
A platinum colloidal sol of finely divided particles of oxidized complex platinum sulfite acid, said particles having an average size of substantially 15-25 Angstroms and being prepared in accordance with the method of claim 2.
Claim 9
Dependent Claim
35 words
A platinum colloidal sol of finely divided particles of oxidized complex platinum sulfite acid, said particles having an average size of substantially 15-25 Angstroms and being prepared in accordance with the method of claim 3.
Claim 10
Dependent Claim
35 words
A platinum colloidal sol consisting essentially of black, glossy, oxidized complex platinum sulfite acid dispersed in water, said oxidized acid being in the form of finely divided particles of average size of substantially 15-25 Angstroms.
Claim 11
Dependent Claim
35 words
A platinum colloidal sol consisting essentially of black, glossy, oxidized complex platinum sulfite acid dispersed in water, said oxidized acid being in the form of finely divided particles of average size of substantially 15-25 Angstroms.
Claim 12
Dependent Claim
23 words
A platinum colloidal sol in accordance with claim 7, wherein said sulfite acid comprises substantially two moles of sulfite per atom of platinum.
Claim 13
Dependent Claim
28 words
A platinum colloidal sol in accordance with claim 8, wherein said complex sulfite acid is represented substantially by the empirical formula H 3 Pt(SO 3 ) 2 OH.
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) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |