US3948684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygen electrode and process for making the same
Assignee: Department of National Defence
•
Filing: 1973-10-29
•
Granted: 1976-04-06
•
Expires: 1993-10-29
Abstract
Abstract An improved gas permeable hydrophobic electrode structure and procedures for making it are provided. The electrode structure comprises an electrically conductive metal current collecting grid and catalyst substrate, for example, nickel. A manganese dioxide catalyst is deposited on, and is adhered to, both side faces of the grid. Such manganese dioxide is one which has been deposited in situ on a suitable substrate, for example, activated carbon or sintered nickel, and is bound together within the selected substrate by means of a fluorocarbon polymer, for example, polytetrafluoroethylene. A hydrophobic semipermeable membrane, for example, a fibrous polytetrafluoroethylene membrane or a microporous polypropylene membrane, is secured on one side of the coated nickel grid. The catalyst of manganese dioxide, formed in situ, for example, by specifically recited techniques on the above-noted selected substrate is bound together within the pore structure of the selected substrate by means of a fluorocarbon polymer, for example, polytetrafluoroethylene.
Inventors
- 👤 William A. Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:32
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
99 words
An improvement in a process for preparing a gas permeable hydrophobic electrode structure in which a manganese dioxide catalyst is bound to both faces of an electrically conductive metal current collecting grid, and in which a hydrophobic semi-permeable membrane is provided on one side of said coated grid, the improvement comprising: producing said manganese dioxide by the step of chemically decomposing an alkali metal permanganate in situ on an activated carbon substrate at a temperature below about 125°C.; and binding said manganese dioxide together within the pore structure of said activated carbon substrate by means of a fluorocarbon polymer.
Claim 2
Dependent Claim
99 words
An improvement in a process for preparing a gas permeable hydrophobic electrode structure in which a manganese dioxide catalyst is bound to both faces of an electrically conductive metal current collecting grid, and in which a hydrophobic semi-permeable membrane is provided on one side of said coated grid, the improvement comprising: producing said manganese dioxide by the step of chemically decomposing an alkali metal permanganate in situ on an activated carbon substrate at a temperature below about 125°C.; and binding said manganese dioxide together within the pore structure of said activated carbon substrate by means of a fluorocarbon polymer.
Claim 3
Dependent Claim
15 words
The improvement as claimed in claim 1, wherein the alkali metal permanganate is potassium permanganate.
Claim 4
Dependent Claim
32 words
The process of claim 2 wherein said manganese dioxide is produced by admixing said potassium permanganate with said activated carbon and heating said mixture to a temperature of up to about 125°C.
Claim 5
Dependent Claim
29 words
The process of claim 2 wherein said manganese dioxide is produced by chemically reacting potassium permanganate with hydrogen peroxide at room temperature in the presence of said activated carbon.
Claim 6
Dependent Claim
39 words
The process of claim 4 wherein said manganese dioxide catalyst is produced by admixing said activated carbon, said potassium permanganate and an aqueous suspension of said fluorocarbon and heating said mixture to a temperature of up to about 125°C.
Claim 7
Dependent Claim
33 words
The process of claim 4 wherein said manganese dioxide is produced by admixing said activated carbon, said potassium permanganate and an aqueous suspension of said fluorocarbon, and reacting said mixture with hydrogen peroxide.
Claim 8
Dependent Claim
101 words
The process of claim 1 wherein said manganese dioxide is produced by admixing said alkali metal permanganate with said activated carbon and heating said mixture up to a temperature of about 125°C, and including the further steps of: first applying the admixture of activated carbon, manganese dioxide and fluorocarbon polymer to both sides of an electrically conductive metal grid, which acts as a catalyst substrate and a current collector; and then drying said admixture; thereby to unite it to said grid and to bind said manganese dioxide to the pore structure of the activated carbon by means of said fluorocarbon polymer.
Claim 9
Dependent Claim
73 words
The process of claim 5 including the further steps of: first applying the admixture of activated carbon, manganese dioxide and fluorocarbon polymer to both sides of an electrically conductive metal grid, which acts as a catalyst substrate and a current collector; and then drying said admixture; thereby to unite it to said grid and to bind said manganese dioxide to the pore structure of the activated carbon by means of said fluorocarbon polymer.
Claim 10
Dependent Claim
73 words
The process of claim 6 including the further steps of: first applying the admixture of activated carbon, manganese dioxide and fluorocarbon polymer to both sides of an electrically conductive metal grid, which acts as a catalyst substrate and a current collector; and then drying said admixture; thereby to unite it to said grid and to bind said manganese dioxide to the pore structure of the activated carbon by means of said fluorocarbon polymer.
Claim 11
Dependent Claim
25 words
The process of claim 8 including the step of covering one face of said coated grid with a semi-permeable membrane formed of a hydrophobic material.
Claim 12
Dependent Claim
25 words
The process of claim 9 including the step of covering one face of said coated grid with a semi-permeable membrane formed of a hydrophobic material.
Claim 13
Dependent Claim
13 words
The process of claim 10 wherein said hydrophobic material is a fibrous polytetrafluoroethylene.
Claim 14
Dependent Claim
13 words
The process of claim 11 wherein said hydrophobic material is a fibrous polytetrafluoroethylene.
Claim 15
Dependent Claim
13 words
The process of claim 10 wherein said hydrophobic material is a microporous polypropylene.
Claim 16
Dependent Claim
13 words
The process of claim 11 wherein said hydrophobic material is a microporous polypropylene.
Claim 17
Dependent Claim
96 words
The process of claim 2 and comprising the steps of: i. admixing activated carbon and potassium permanganate; ii. chemically reducing the potassium permanganate to manganese dioxide in situ in the activated carbon by heating to a temperature not exceeding about 125°C.; iii. drying such mixture and preparing a paste comprising such dried mixture and an aqueous suspension of polytetrafluoroethylene; iv. spreading said paste on both sides of a nickel current collecting grid screen; v. drying said paste and then hot pressing the assembly; and vi. covering one side of said assembly with a polytetrafluoroethylene semi-permeable membrane.
Claim 18
Dependent Claim
92 words
The process of claim 4 and comprising the steps of: i. admixing activated carbon and potassium permanganate; ii. chemically reducing the potassium permanganate to manganese dioxide in situ in the activated carbon by reaction with hydrogen peroxide; iii. drying such mixture and preparing a paste comprising such dried mixture and an aqueous suspension of polytetrafluoroethylene; iv. spreading said paste on both sides of a nickel current collecting grid screen; v. drying said paste and then hot pressing the assembly; and vi. covering one side of said assembly with a polytetrafluoroethylene semi-permeable membrane.
References Cited (Backward Citations)
US1221991A
Cited
US1617230A
Cited
US1639985A
Cited
US3097974A
Cited
US3212936A
Cited
US3432355A
Cited
US3347668A
Cited
US3310434A
Cited
US3451856A
Cited
US3649361A
Cited
US3793083A
Cited
US3640683A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |