US4457953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode material
Assignee: Dow Chemical Co
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Filing: 1983-01-10
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Granted: 1984-07-03
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Expires: 2003-01-10
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
2026-10-24 18:10
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/02; C25B1/04; C25B11/00; C25B11/02; C25B11/04; C25B11/042; C25B11/043; C25B11/051; C25B11/073; C25B11/091; C25B11/095; C25B9/00; C25B9/40; C25B9/43; C25B9/70
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
65 words
A method for the production of coated particles suitable for use as an electrode material comprising: forming a fluid admixture of a particulated substrate, an electrochemically active, electrically conductive catalyst and a binder, and bonding the catalyst to the substrate by solidifying the fluid admixture, wherein said substrate is selected from the group of materials consisting of steel, iron, graphite, nickel, platinum, copper and silver.
Claim 2
Independent Claim
65 words
A method for the production of coated particles suitable for use as an electrode material comprising: forming a fluid admixture of a particulated substrate, an electrochemically active, electrically conductive catalyst and a binder, and bonding the catalyst to the substrate by solidifying the fluid admixture, wherein said substrate is selected from the group of materials consisting of steel, iron, graphite, nickel, platinum, copper and silver.
Claim 3
Dependent Claim
25 words
The method of claim 1 including forming the fluid admixture by heating the binder to a temperature at least as high as its softening temperature.
Claim 4
Dependent Claim
20 words
The method of claim 1 including forming the fluid admixture by dispersing the catalyst, binder and substrate in a liquid.
Claim 5
Dependent Claim
10 words
The method of claim 3 where the liquid is water.
Claim 6
Dependent Claim
17 words
The method of claim 1 including forming the fluid admixture by dissolving the binder in a solvent.
Claim 7
Dependent Claim
17 words
The method of claim 3 wherein bonding is accomplished by heating the admixture to evaporate the liquid.
Claim 8
Dependent Claim
17 words
The method of claim 5 wherein bonding is accomplished by heating the admixture to evaporate the solvent.
Claim 9
Dependent Claim
23 words
The method of claim 2 wherein bonding is accomplished by cooling the admixture to a temperature below the softening temperature of the binder.
Claim 10
Dependent Claim
11 words
The method of claim 1 wherein the catalyst is carbon black.
Claim 11
Dependent Claim
10 words
The method of claim 1 wherein the binder is polytetrafluoroethylene.
Claim 12
Dependent Claim
20 words
The method of claim 9 wherein the weight ratio of carbon black to binder is from about 4:1 to 1:4.
Claim 13
Dependent Claim
21 words
The method of claim 9 wherein the weight ratio of carbon black to binder is from about 1:1.5 to about 1.5:1.
Claim 14
Dependent Claim
12 words
The method of claim 1 including adding a surfactant to the admixture.
Claim 15
Dependent Claim
12 words
The method of claim 13 where the surfactant is a non-ionic surfactant.
Claim 16
Dependent Claim
13 words
The method of claim 1 wherein the catalyst is a peroxide decomposition catalyst.
Claim 17
Dependent Claim
22 words
The method of claim 15 wherein the volume ratio of peroxide decomposition catalyst to binder is from about 4:1 to about 1:4.
Claim 18
Dependent Claim
22 words
The method of claim 15 wherein the volume ratio of peroxide decomposition catalyst to binder is from about 1:1.5 to about 1.5:1.
Claim 19
Dependent Claim
16 words
The method of claim 9 including adding a second catalyst which is a peroxide decomposition catalyst.
Claim 20
Dependent Claim
35 words
The method of claim 18 wherein the total amount of catalyst in the admixture is about 1 to about 35 weight percent peroxide decomposition catalyst and about 65 to about 99 weight percent carbon black.
Claim 21
Dependent Claim
35 words
The method of claim 18 wherein the total amount of catalyst in the admixture is about 3 to about 10 weight percent peroxide decomposition catalyst and about 90 to about 97 weight percent carbon black.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |