Patent US4003757A successfully refreshed from Google Patents.
US4003757A
Expired / Lapsed
US
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Silver-II-oxide for galvanic elements
Assignee: VARTA Batterie AG
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Filing: 1975-06-23
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Granted: 1977-01-18
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Expires: 1995-06-23
Abstract
Abstract Silver-II-oxide for use in galvanic elements is produced by adding an oxidant to a metallic silver powder suspension in an alkaline solution. An exceptionally stable material results.
Inventors
- 👤 Walter Karl Lux
- 👤 Tsvetko Chobanov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:55
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/36; H01M4/48; H01M4/54; C; C01; C01G; C01G5/00; C30; C30B; C30B7/00; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
37 words
In a process for producing silver II-oxide for galvanic elements, the improvement which comprises adding an oxidant to an alkaline solution containing undissolved metallic silver powder, thereby oxidizing the powder to silver-II-oxide, the oxidant being potassium peroxidisulfate.
Claim 2
Dependent Claim
37 words
In a process for producing silver II-oxide for galvanic elements, the improvement which comprises adding an oxidant to an alkaline solution containing undissolved metallic silver powder, thereby oxidizing the powder to silver-II-oxide, the oxidant being potassium peroxidisulfate.
Claim 3
Dependent Claim
21 words
The process of claim 1 further comprising forming a suspension of the powder in the solution before the oxidant is added.
Claim 4
Dependent Claim
15 words
The process of claim 1 wherein the solution is an aqueous solution of sodium hydroxide.
Claim 5
Dependent Claim
21 words
The process of claim 1 further comprising heating the solution to approximately 50° to 95° C during the addition of oxidant.
Claim 6
Dependent Claim
22 words
The process of claim 1 wherein the solution is heated to a temperature of about 85° C during the addition of oxidant.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the oxidant is added in incremental portions.
Claim 8
Dependent Claim
23 words
The process of claim 1 wherein a quantity of oxidant is added in excess of that sufficient to oxidize all the silver powder.
Claim 9
Dependent Claim
22 words
The process of claim 1 further comprising filtering the solids from the solution, washing them to remove alkaline substances, and drying them.
Claim 10
Dependent Claim
21 words
The process of claim 7 wherein up to two times the quantity necessary to oxidize all the silver powder is added.
Claim 11
Dependent Claim
14 words
The process of claim 8 further comprising reducing the dried material to particle form.
Claim 12
Dependent Claim
18 words
The process of claim 10 further comprising incorporating the material reduced to particle form into a galvanic element.
Claim 13
Dependent Claim
41 words
A material for use in primary cells produced by the steps of forming a suspension of metallic silver powder in an alkaline solution, and adding an oxidant to the solution to oxidize the powder into silver-II-oxide, the oxidant being potassium peroxidisulfate.
Claim 14
Dependent Claim
41 words
A material for use in primary cells produced by the steps of forming a suspension of metallic silver powder in an alkaline solution, and adding an oxidant to the solution to oxidize the powder into silver-II-oxide, the oxidant being potassium peroxidisulfate.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |