US3989516A
Expired / Lapsed
US
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Method of making silver-cadmium oxide-tin oxide type contact materials
Assignee: Duracell Inc USA
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Filing: 1975-09-29
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Granted: 1976-11-02
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Expires: 1995-09-29
Abstract
Abstract A method of making silver-cadmium oxide-tin oxide type contact materials by oxidizing three-dimensional particles containing silver, cadmium, and tin and then consolidating the oxidized particles into bodies of the desired configuration. The resultant contact materials have a substantially uniform distribution of relatively coarse cadmium oxide particles, improved arc erosion properties, and little or no depleted or porous grain boundaries.
Inventors
- 👤 Fredrik O. Haarbye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:30
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; H01H1/02372; H01H1/02374; C; C22; C22C; C22C1/00; C22C1/10; C22C1/1078; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
59 words
A method of making silver-cadmium oxide-tin oxide type electrical contact materials comprising the steps of providing wire containing Ag-Cd-Sn, reducing the wire into a plurality of three-dimensional shapes, subjecting the three-dimensional shapes containing Ag-Cd-Sn to an oxygen containing atmosphere and heat to oxidize oxidizable constituents, consolidating the oxidized three-dimensional shapes, forming the consolidated three-dimensional shapes into the desired shape.
Claim 2
Independent Claim
59 words
A method of making silver-cadmium oxide-tin oxide type electrical contact materials comprising the steps of providing wire containing Ag-Cd-Sn, reducing the wire into a plurality of three-dimensional shapes, subjecting the three-dimensional shapes containing Ag-Cd-Sn to an oxygen containing atmosphere and heat to oxidize oxidizable constituents, consolidating the oxidized three-dimensional shapes, forming the consolidated three-dimensional shapes into the desired shape.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the three-dimensional shapes containing Ag-Cd-Sn are wire slugs.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein the forming step includes the step of extruding the consolidated three-dimensional shapes.
Claim 5
Dependent Claim
21 words
The method of claim 3, wherein the extruded shape is worked to the extent necessary to obtain the desired final size.
Claim 6
Dependent Claim
17 words
The method of claim 3, wherein the compacted wire slugs are extruded into either strip or wire.
Claim 7
Dependent Claim
36 words
The method of claim 1, wherein the three-dimensional shapes prior to the step of oxidation contain about 5 wt.% to about 25 wt.% Cd, about 0.01 wt.% to about 3 wt.% Sn, and the remainder Ag.
Claim 8
Dependent Claim
27 words
The method of claim 2 wherein the wire slugs have a length of about 0.5 inch or less and a diameter of about 0.14 inch or less.
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) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |