Patent US4391668A successfully refreshed from Google Patents.
US4391668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed oxide oxygen electrode
Assignee: Department of National Defence
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Filing: 1981-04-22
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Granted: 1983-07-05
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Expires: 2001-04-22
Abstract
Abstract The invention disclosed is a novel method for the preparation of a nickel/cobalt oxide impregnated nickel plaque material involving a single oxidation step. The nickel plaque material is cleaned, impregnated with an aqueous cobalt nitrate solution and dried. The nickel/cobalt oxide is then formed in a single oxidation step.
Inventors
- 👤 William A. Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:25
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/86; H01M4/90; H01M4/9016; C; C25; C25B; C25B11/00; C25B11/04; C25B11/051; C25B11/055; C25B11/057; C25B11/073; C25B11/075; C25B11/077; C25B11/0771; C25B11/091; C25B11/095; H01M4/88; H01M4/8817; H01M4/8821; H01M4/8878; H01M4/8882; H01M4/8892; H01M4/8896; C25B11/061; H01M2004/8678; H01M2004/8689; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
A method for the preparation of a nickel/cobalt oxide impregnated nickel plaque material, comprising (a) providing a substantially oxide free sintered nickel plaque material; (b) dipping the nickel plaque in an aqueous solution of cobalt nitrate and polytetrafluoroethylene as a wet-proofing agent; (c) drying the cobalt nitrate impregnated plaque so formed; and (d) heat treating at about 200° to about 250° C. for about 1 to 8 hours, to form the nickel/cobalt oxide impregnated nickel plaque material.
Claim 2
Independent Claim
77 words
A method for the preparation of a nickel/cobalt oxide impregnated nickel plaque material, comprising (a) providing a substantially oxide free sintered nickel plaque material; (b) dipping the nickel plaque in an aqueous solution of cobalt nitrate and polytetrafluoroethylene as a wet-proofing agent; (c) drying the cobalt nitrate impregnated plaque so formed; and (d) heat treating at about 200° to about 250° C. for about 1 to 8 hours, to form the nickel/cobalt oxide impregnated nickel plaque material.
Claim 3
Dependent Claim
19 words
A method according to claim 1, wherein the concentration of the aqueous cobalt nitrate is 200 to 800 mg/ml.
Claim 4
Dependent Claim
18 words
A method according to claim 2, wherein the concentration of the aqueous cobalt nitrate is about 800 mg/ml.
Claim 5
Dependent Claim
24 words
A method according to claim 2, wherein the heat treatment is effected at about 250° C. for about 4 hours in a drying furnace.
Claim 6
Dependent Claim
22 words
A method according to claim 1 wherein step (c) the plaque is air dried at about 125° C. for about 12 hours.
Claim 7
Dependent Claim
36 words
A method according to claim 1, 2 or 4, wherein immediately prior to step (a) the nickel plaque is subjected to a cleaning treatment to remove oxides which may be on the surface of the plaque.
Claim 8
Dependent Claim
45 words
A method according to claim 1, wherein the nickel plaque material is in the form of a flat plate and including the additional steps of (g) covering one side of the plate with a polytetrafluoroethylene membrane; and (h) hot pressing the membrane onto the plate.
Claim 9
Independent Claim
167 words
A method for the preparation of a nickel/cobalt oxide impregnated nickel plaque material, comprising the steps of: (a) providing a substantially oxide-free sintered nickel plaque material; (b) dipping the nickel plaque in an aqueous solution of cobalt nitrate; (c) drying the cobalt nitrate impregnated plaque so formed; (d) heat treating at about 200° to 250° C. for about 1 to 8 hours, to form the nickel/cobalt oxide impregnated nickel plaque material; (e) covering one side of the plate with a polytetrafluoroethylene membrane; (f) cold pressing the membrane onto the plate; (g) exposing the other side of the plate to aqueous cobalt nitrate and polytetrafluoroethylene solution; (h) drying the plate; (i) removing the polytetrafluoroethylene covering from said one side of the plate; (j) heat treating the plate at about 250° C. for about 3 hours, to form a plate wet-proofed only on said other side of the plate; (k) covering the wet-proofed side of the plate with a polytetrafluoroethylene membrane; and (l) hot-pressing the membrane onto the plate.
Claim 10
Independent Claim
167 words
A method for the preparation of a nickel/cobalt oxide impregnated nickel plaque material, comprising the steps of: (a) providing a substantially oxide-free sintered nickel plaque material; (b) dipping the nickel plaque in an aqueous solution of cobalt nitrate; (c) drying the cobalt nitrate impregnated plaque so formed; (d) heat treating at about 200° to 250° C. for about 1 to 8 hours, to form the nickel/cobalt oxide impregnated nickel plaque material; (e) covering one side of the plate with a polytetrafluoroethylene membrane; (f) cold pressing the membrane onto the plate; (g) exposing the other side of the plate to aqueous cobalt nitrate and polytetrafluoroethylene solution; (h) drying the plate; (i) removing the polytetrafluoroethylene covering from said one side of the plate; (j) heat treating the plate at about 250° C. for about 3 hours, to form a plate wet-proofed only on said other side of the plate; (k) covering the wet-proofed side of the plate with a polytetrafluoroethylene membrane; and (l) hot-pressing the membrane onto the plate.
Claim 11
Dependent Claim
19 words
A method according to claim 8 wherein the concentration of the aqueous cobalt nitrate is 200 to 800 mg/ml.
References Cited (Backward Citations)
US4132619A
Cited
US4279713A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |