Patent US4292197A successfully refreshed from Google Patents.
US4292197A
Expired / Lapsed
US
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Method of preparing electrocatalyst for an oxygen depolarized cathode electrolytic cell
Assignee: PPG Industries Inc
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Filing: 1979-10-09
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Granted: 1981-09-29
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Expires: 1999-10-09
Abstract
Abstract Disclosed is a method of preparing a cathodic electrocatalyst where the cathode is a bed of porous particles having HO2- disproportionation catalyst dispersed on the surfaces and pores thereof.
Inventors
- 👤 Ronald D. Chamberlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:43
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/48; B01J23/50; B01J31/00; B01J31/02; B01J31/06; C; C25; C25B; C25B11/00; C25B11/02; C25B11/037; C25B11/04; C25B11/042; C25B11/046; C25B11/048; C25B11/051; C25B9/00; C25B9/40; C25B9/47; C25B9/70
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A method of preparing electroconductive, catalytic particles comprising the steps of: (a) forming a slurry of activated carbon and a thermally decomposable silver compound; (b) impregnating the activated carbon with the thermally decomposable silver compound; (c) drying the slurry whereby to form dried carbon product; (d) thereafter mixing the dried carbon product with a dispersion of a hydrophobic compound to form a second slurry; (e) impregnating the hydrophobic compound into the carbon product; (f) forming the second slurry into particles; and (g) thereafter heating the particles formed from the second slurry whereby to dry the particles, sinter the hydrophobic compound, and form electroconductive, catalytic, sintered particles having silver HO 2 - disproportionation catalyst impregnated carbon and hydrophobic material.
Claim 2
Independent Claim
118 words
A method of preparing electroconductive, catalytic particles comprising the steps of: (a) forming a slurry of activated carbon and a thermally decomposable silver compound; (b) impregnating the activated carbon with the thermally decomposable silver compound; (c) drying the slurry whereby to form dried carbon product; (d) thereafter mixing the dried carbon product with a dispersion of a hydrophobic compound to form a second slurry; (e) impregnating the hydrophobic compound into the carbon product; (f) forming the second slurry into particles; and (g) thereafter heating the particles formed from the second slurry whereby to dry the particles, sinter the hydrophobic compound, and form electroconductive, catalytic, sintered particles having silver HO 2 - disproportionation catalyst impregnated carbon and hydrophobic material.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the activated carbon has a surface area of about 100 to 1,000 square meters per gram.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the activated carbon is acetylene black.
Claim 5
Dependent Claim
17 words
The method of claim 1 comprising vacuum impregnating the activated carbon with the thermally decomposable silver compound.
Claim 6
Dependent Claim
17 words
The method of claim 1 comprising heating the dried carbon to form HO 2 - disproportionation catalyst.
Claim 7
Dependent Claim
15 words
The method of claim 1 comprising vacuum impregnating the hydrophobic compound into the carbon product.
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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) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |