Patent US4481303A successfully refreshed from Google Patents.
US4481303A
Expired / Lapsed
US
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Electrode material
Assignee: Dow Chemical Co
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Filing: 1983-08-08
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Granted: 1984-11-06
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Expires: 2003-08-08
Abstract
Abstract A particle suitable for use as an electrode material comprising a substrate at least partially coated with an admixture of a hydrophobic material and an electrochemically active, electrically conductive catalyst. The invention includes a method for producing the coated particles.
Inventors
- 👤 James A. McIntyre
- 👤 Robert F. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:37
CPC Classifications
C; C25; C25B; C25B9/00; C25B9/40; C25B11/00; C25B11/02; C25B11/04; C25B11/042; C25B11/043; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B9/47; C25B9/70; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
95 words
A particle suitable for use as an electrode material comprising: a generally spherical substrate selected from the group of materials consisting of steel, iron, graphite, nickel, platinum, copper and silver, said substrate being substantially completely coated with an admixture of a hydrophobic binder and an electrochemically active, electrically conductive catalyst selected from the group consisting of silver, carbon black, platinum, activated carbon and mixtures thereof wherein said particle has a diameter of from about 0.7 mm to about 2.5 cm and said coating has a thickness of from about 1 mil to about 5 mils.
Claim 2
Dependent Claim
95 words
A particle suitable for use as an electrode material comprising: a generally spherical substrate selected from the group of materials consisting of steel, iron, graphite, nickel, platinum, copper and silver, said substrate being substantially completely coated with an admixture of a hydrophobic binder and an electrochemically active, electrically conductive catalyst selected from the group consisting of silver, carbon black, platinum, activated carbon and mixtures thereof wherein said particle has a diameter of from about 0.7 mm to about 2.5 cm and said coating has a thickness of from about 1 mil to about 5 mils.
Claim 3
Dependent Claim
15 words
The material of claim 1 wherein the catalyst is active for the reduction of oxygen.
Claim 4
Dependent Claim
25 words
The material of claim 2 wherein the catalyst has a surface area of from about 100 to about 1,000 square meters per gram of catalyst.
Claim 5
Dependent Claim
25 words
The material of claim 3 wherein the catalyst has a surface area of from about 150 to about 500 square meters per gram of catalyst.
Claim 6
Dependent Claim
11 words
The material of claim 1 wherein the substrate is electrically conductive.
Claim 7
Dependent Claim
12 words
The material of claim 1 wherein the binder is a solid fluorocarbon.
Claim 8
Dependent Claim
11 words
The material of claim 6 wherein the solid fluorocarbon is polytetrafluoroethylene.
Claim 9
Dependent Claim
11 words
The material of claim 1 wherein the catalyst is carbon black.
References Cited (Backward Citations)
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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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |