US3785810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-metal oxide composite and method of manufacturing the same
Assignee: Doduco Solutions GmbH
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Filing: 1971-12-22
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Granted: 1974-01-15
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Expires: 1991-12-22
Abstract
Abstract The composite comprises a silver matrix having grain boundaries and metal oxide grains enriched at said grain boundaries of said silver matrix. An alloy is provided, which comprises silver, a second metallic component, and at least two alloying metals selected from the class consisting of calcium, antimony, magnesium, beryllium, aluminum, tin, manganese, and zirconium. Said second metallic component and said alloying metals are oxidized in said alloy to form said composite.
Inventors
- 👤 E Durrwachter
- 👤 U Harmsen
- 👤 W Merl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:00
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; H01H1/02372; H01H1/02374; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021; C22C5/00; C22C5/06; C22C5/10; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
Method according to claim 1, wherein the oxides of each of said other alloy components are present in amounts of from about 0.5% to about 2% by weight.
Claim 2
Dependent Claim
29 words
Method according to claim 1, wherein said alloy is formed from 86.7% silver, 12% cadmium, 0.5% antimony, 0.5% tin, and 0.3% calcium, all of said percents being by weight.
Claim 3
Dependent Claim
29 words
Method according to claim 1, wherein said alloy is formed from 88.5% silver, 10% cadmium, 0.7% calcium, 0.6% tin, and 0.2% nickel, all of said percents being by weight.
Claim 4
Dependent Claim
28 words
Method according to claim 1, wherein said alloy is formed from 87.4% silver, 11% cadmium, 1% tin, 0.3% calcium, 0.3% nickel, all of said percents being by weight.
Claim 5
Dependent Claim
28 words
Method according to claim 1, wherein said alloy is formed from 86.7% silver, 12% cadmium, 0.5% antimony, 0.5% tin, 0.3% calcium, all of said percents being by weight.
Claim 6
Dependent Claim
26 words
Method according to claim 1, wherein said alloy is formed from 87.2% silver, 12% cadmium, 0.5% tin, 0.3% calcium, all of said percents being by weight.
Claim 7
Dependent Claim
27 words
Method according to claim 1, wherein said alloy is formed from 87% silver, 12% cadmium, 0.5% antimony and 0.5% tin, all of said percents being by weight.
Claim 8
Dependent Claim
137 words
Method of manufacturing contact pieces for low voltage switching which comprises (1) forming an alloy from silver, cadmium and at least two alloy metals selected from the group consisting of calcium, antimony, magnesium, beryllium, aluminum, tin, manganese, and zirconium, (2) shaping said alloy into electrical contact pieces of desired size and shape, (3) internally oxidizing the contact pieces of said alloy in an oxidizing atmosphere at a temperature from about 600*C to about 850*C to precipitate extremely fine granulated oxide material in the grain boundaries of the silver, the proportions by weight of components in said oxidized alloy being from about 6% to about 15% of cadmium oxide, and from about 0.5% to about 6% of each oxide of said alloy metals, and (4) recovering the oxidized contact pieces suitable for long life low voltage switching operations.
Claim 9
Dependent Claim
97 words
Composite of silver-cadmium oxide with at least two oxides of alloy metals selected from the group consisting of calcium, antimony, magnesium, beryllium, aluminum, tin, manganese, and zirconium, said composite consisting essentially of a silver matrix, fine grains of oxide less than 0.1 micron diameter in the grain boundaries of the silver matrix and in considerably less extent in the silver grain, the amounts by weight of components other than silver in said composite being from about 6% to about 15% cadmium oxide, and from about 0.5% to about 6% of each of said oxides of alloy metals.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |