US4175055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry mix method for making an electrochemical cell electrode
Assignee: RTX Corp
•
Filing: 1978-06-28
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Granted: 1979-11-20
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Expires: 1998-06-28
Abstract
Abstract A method for making an electrochemical cell electrode involves depositing a layer of mechanically blended dry catalyzed carbon powder and dry hydrophobic polymer powder on the surface of a substrate by dispersing the mixture of powders as a cloud in a chamber over the substrate and pulling the powder onto the substrate by drawing a vacuum under the substrate. The method is particularly adapted to the high speed manufacture of electrodes.
Inventors
- 👤 Glen J. Goller
- 👤 Vincent J. Petraglia
- 👤 Joseph R. Salonia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:19
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/88; H01M4/8825; H01M4/886; H01M4/8878; H01M4/8882; H01M4/8885; H01M4/8896; H01M4/96; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
102 words
A method for making an electrochemical cell electrode comprising the steps of: blending together, in dry form, dry carbon particles and dry hydrophobic polymer particles to form a dry mixture; applying a uniform layer of the dry mixture on the surface of a porous electrode substrate with virtually none of the mixture within the pores of the substrate by dispersing the mixture as a cloud of particles in a chamber over said surface of the substrate and pulling the carbon and polymer particles onto said surface by drawing a vacuum under the substrate; compacting the applied layer; and sintering the compacted layer.
Claim 2
Independent Claim
102 words
A method for making an electrochemical cell electrode comprising the steps of: blending together, in dry form, dry carbon particles and dry hydrophobic polymer particles to form a dry mixture; applying a uniform layer of the dry mixture on the surface of a porous electrode substrate with virtually none of the mixture within the pores of the substrate by dispersing the mixture as a cloud of particles in a chamber over said surface of the substrate and pulling the carbon and polymer particles onto said surface by drawing a vacuum under the substrate; compacting the applied layer; and sintering the compacted layer.
Claim 3
Dependent Claim
12 words
The method according to claim 1 wherein the hydrophobic polymer is PTFE.
Claim 4
Dependent Claim
45 words
The method according to claim 2 wherein the PTFE in the dry mixture has a molecular weight of at least 10 6 and, prior to its being applied to the substrate the dry mixture has a maximum particle size of less than about ten microns.
Claim 5
Dependent Claim
16 words
The method according to claim 2 wherein the carbon particles in the dry mixture are precatalyzed.
Claim 6
Dependent Claim
18 words
The method according to claim 2 wherein the carbon particles in the dry mixture are precatalyzed with platinum.
Claim 7
Dependent Claim
47 words
The method according to claim 1 wherein the hydrophobic polymer in the dry mixture has a molecular weight of at least 10 6 and a mean particle size, prior to application to the substrate, of one micron or less with no particles greater than about five microns.
Claim 8
Dependent Claim
27 words
The method according to claim 3 wherein the electrode substrate is graphitized carbon paper made from carbon fibers and has an open porosity of at least 80%.
Claim 9
Dependent Claim
20 words
The method according to claim 7 wherein the dry mixture has a mean particle size of one micron or less.
Claim 10
Dependent Claim
18 words
The method according to claim 7 wherein the carbon particles in the dry mixture are precatalyzed with platinum.
References Cited (Backward Citations)
US3900607A
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GB1163479A
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US3573991A
Cited
US4044193A
Cited
US4129633A
Cited
US3829327A
Cited
US3857737A
Cited
US4017663A
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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) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |