US3972735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making electrodes for electrochemical cells
Assignee: RTX Corp
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Filing: 1975-04-04
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Granted: 1976-08-03
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Expires: 1995-04-04
Abstract
Abstract A novel method for making an electrode for use in an electrochemical cell comprises forming a substrate by coating the fibers of a fibrous carbon paper with pyrolytic carbon, wet proofing the coated paper with a hydrophobic polymer, sintering the wet proofed paper, and applying a catalyst/hydrophobic polymer layer thereon.
Inventors
- 👤 Richard D. Breault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:22
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A method for making an electrode for an electrochemical cell, comprising: forming a substrate including the step of coating the fibers of a fibrous carbon paper with pyrolytic carbon wherein said pyrolytic carbon forms electrically conductive bonds between said fibers, wet proofing said coated paper by impregnating said paper with a hydrophobic polymer, and sintering the impregnated paper at a temperature of about 580° to 630°F; and applying a layer to the sintered paper consisting of a catalyst and a hydrophobic polymer.
Claim 2
Independent Claim
82 words
A method for making an electrode for an electrochemical cell, comprising: forming a substrate including the step of coating the fibers of a fibrous carbon paper with pyrolytic carbon wherein said pyrolytic carbon forms electrically conductive bonds between said fibers, wet proofing said coated paper by impregnating said paper with a hydrophobic polymer, and sintering the impregnated paper at a temperature of about 580° to 630°F; and applying a layer to the sintered paper consisting of a catalyst and a hydrophobic polymer.
Claim 3
Dependent Claim
36 words
The method for making an electrode as defined in claim 1, wherein said step of impregnating the coated paper with a hydrophobic polymer includes impregnating the coated paper with 5 to 40% by weight hydrophobic polymer.
Claim 4
Dependent Claim
30 words
The method for making an electrode as defined in claim 1 wherein said step of impregnating said coated paper with a hydrophobic polymer includes impregnating said coated paper with polytetrafluoroethylene.
Claim 5
Dependent Claim
33 words
The method for making an electrode as defined in claim 1 wherein the step of impregnating said coated paper with a hydrophobic polymer comprises impregnating said coated paper with a hydrophobic fluorocarbon polymer.
Claim 6
Independent Claim
84 words
A method for making an electrode for an electrochemical cell, comprising: forming a substrate including the steps of coating the fibers of a fibrous carbon paper with pyrolytic carbon wherein said pyrolytic carbon forms electrically conductive bonds between said fibers, wet proofing said coated paper by impregnating said paper with 5 to 40% by weight polytetrafluoroethylene, and sintering the impregnated paper at a temperature of about 580° to 630°F; and applying a layer to the sintered paper consisting essentially of a catalyst and polytetrafluoroethylene.
Claim 7
Independent Claim
84 words
A method for making an electrode for an electrochemical cell, comprising: forming a substrate including the steps of coating the fibers of a fibrous carbon paper with pyrolytic carbon wherein said pyrolytic carbon forms electrically conductive bonds between said fibers, wet proofing said coated paper by impregnating said paper with 5 to 40% by weight polytetrafluoroethylene, and sintering the impregnated paper at a temperature of about 580° to 630°F; and applying a layer to the sintered paper consisting essentially of a catalyst and polytetrafluoroethylene.
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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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |