US4032697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of producing electrodes for alkaline batteries
Assignee: AT&T Inc
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Filing: 1975-11-07
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Granted: 1977-06-28
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Expires: 1995-11-07
Abstract
Abstract A process is described for making alkaline batteries in which particular attention is given to the pretreatment of nickel plaques prior to impregnation. This pretreatment involves production of a uniform thin oxide film on the nickel plaque surface under carefully controlled conditions. This pretreatment prevents corrosion under conditions for commercial production of electrodes for alkaline batteries and permits not only higher loadings but more uniform loadings of the electrodes.
Inventors
- 👤 Richard Lawrence Beauchamp
- 👤 Dean William Maurer
- 👤 Thomas Denis O'Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:49
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/24; H01M4/26; H01M4/28; H01M4/64; H01M4/70; H01M4/80; H01M50/00; H01M50/50; H01M50/531; H01M50/534; H01M50/54; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49108; Y10T29/49115
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
121 words
A process for the fabrication of cadmium electrodes for batteries in which the cadmium electrodes are made by impregnating a nickel plaque by a series of steps comprising (a) wetting the porous nickel plaque in a solution which contains cadmium cations with the solution having an acidic pH, (b) precipitating the cadmium ions in the form of a cadmium-ion compound from the solution in the porous nickel plaque characterized in that prior to impregnating the nickel plaque, the nickel plaque is first wetted with a water-containing solution and then air-oxidized in the temperature range between 200° and 500° C. for a time period between 1 minute and 5 hours so as to passivate the nickel plaque against acidic attack during impregnation.
Claim 2
Dependent Claim
121 words
A process for the fabrication of cadmium electrodes for batteries in which the cadmium electrodes are made by impregnating a nickel plaque by a series of steps comprising (a) wetting the porous nickel plaque in a solution which contains cadmium cations with the solution having an acidic pH, (b) precipitating the cadmium ions in the form of a cadmium-ion compound from the solution in the porous nickel plaque characterized in that prior to impregnating the nickel plaque, the nickel plaque is first wetted with a water-containing solution and then air-oxidized in the temperature range between 200° and 500° C. for a time period between 1 minute and 5 hours so as to passivate the nickel plaque against acidic attack during impregnation.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the precipitation is carried out by electrolysis.
Claim 4
Dependent Claim
13 words
The process of claim 1 in which the precipitation is carried out chemically.
Claim 5
Dependent Claim
21 words
The process of claim 3 in which the chemical precipitation is carried out by wetting the plaque with an alkaline solution.
Claim 6
Dependent Claim
16 words
The process of claim 3 in which the chemical precipitation is carried out by thermal decomposition.
Claim 7
Dependent Claim
13 words
The process of claim 1 in which the battery is a nickel-cadmium battery.
Claim 8
Dependent Claim
15 words
The process of claim 1 in which a continuous process is used for electrolytic impregnation.
Claim 9
Dependent Claim
15 words
The process of claim 1 in which a batch process is used for electrolytic impregnation.
Claim 10
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 11
Dependent Claim
12 words
A battery containing an electrode produced by the process of claim 1.
Claim 12
Dependent Claim
13 words
The battery of claim 1 in which the electrode is a cadmium electrode.
Claim 13
Dependent Claim
29 words
The process of claim 1 in which the nickel plaque is wetted by immersing in a water-containing solution with temperature between the boiling and freezing point of the solution.
Claim 14
Dependent Claim
43 words
The process of claim 12 in which the nickel plaque is immersed in the water-containing solution for a time period of up to 30 minutes and the temperature of the water-containing solution is between 40° C. and the boiling temperature of the solution.
References Cited (Backward Citations)
US2007170A
Cited
US2952570A
Cited
US3356534A
Cited
US3284237A
Cited
US3573101A
Cited
US3679481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |