Patent US2347478A successfully refreshed from Google Patents.
Patent US4081644A successfully refreshed from Google Patents.
US4081644A
Expired / Lapsed
US
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Electrical contact material
Assignee: Plessey Handel und Investments AG
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Filing: 1975-10-09
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Granted: 1978-03-28
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Expires: 1995-10-09
Abstract
Abstract An electrical contact material which consists of at least one material selected from a first group which comprises any one of the precious metals, gold, palladium, ruthenium, rhodium and rhenium or their alloys and the silver/palladium series of contact alloys; and not more than three weight per cent of at least one material selected from a second group which comprises lithium, sodium, sodium chloride, potassium compounds, rubidium, caesium and cadmium sulphide spread uniformly throughout, or formed at discrete sites at the surface of, the said at least one material of the first group.
Inventors
- 👤 Terrence Ardern Davies
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:19
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
An electrical contact material which consists of at least one material selected from a first group which comprises any one of the precious metals, gold, palladium, ruthenium, rhodium and rhenium or their alloys and the silver/palladium series of contact alloys; and not more than three weight percent of at least one material selected from a second group which comprises occluded compounds of lithium, sodium, potassium, rubidium, caesium and cadmium, spread uniformly throughout, or formed at discrete sites at the surface of the at least one material of the first group, and a hardening metal when gold is combined with a compound of the second group.
Claim 2
Dependent Claim
105 words
An electrical contact material which consists of at least one material selected from a first group which comprises any one of the precious metals, gold, palladium, ruthenium, rhodium and rhenium or their alloys and the silver/palladium series of contact alloys; and not more than three weight percent of at least one material selected from a second group which comprises occluded compounds of lithium, sodium, potassium, rubidium, caesium and cadmium, spread uniformly throughout, or formed at discrete sites at the surface of the at least one material of the first group, and a hardening metal when gold is combined with a compound of the second group.
Claim 3
Dependent Claim
12 words
An electrical contact formed of the material set forth in claim 1.
Claim 4
Dependent Claim
31 words
An electrical contact material according to claim 1 wherein the concentration of the said at least one material of the second group is in the range 0.01 to 0.25 weight percent.
Claim 5
Dependent Claim
12 words
An electrical contact formed of the material set forth in claim 3.
Claim 6
Dependent Claim
20 words
An electrical contact material as claimed in claim 1 which consists of a mixture of gold and a potassium compound.
Claim 7
Dependent Claim
12 words
An electrical contact formed of the material set forth in claim 5.
Claim 8
Dependent Claim
19 words
An electrical contact material as claimed in claim 5 wherein the potassium concentration is greater than 0.1 weight percent.
Claim 9
Dependent Claim
12 words
An electrical contact formed of the material set forth in claim 7.
Claim 10
Dependent Claim
24 words
An electrical contact material as claimed in claim 1 wherein the hardening metal is selected from a group which consists of cobalt and nickel.
Claim 11
Dependent Claim
12 words
An electrical contact formed of the material set forth in claim 9.
Claim 12
Dependent Claim
26 words
An electrical contact material as claimed in claim 1 which consists of a mixture of gold and at least one material selected from the second group.
Claim 13
Dependent Claim
12 words
An electrical contact formed of the material set forth in claim 11.
Claim 14
Dependent Claim
87 words
An electrical contact material which consists of a mixture of at least one material selected from a first group which comprises palladium, ruthenium, rhodium and rhenium or their alloys and the silver/palladium series of contact alloys; and not more than three weight percent of at least one material selected from a second group which comprises occluded compounds of lithium, sodium, potassium, rubidium, caesium and cadmium spread uniformly throughout, or formed at discrete sites at the surface of, the said at least one material of the first group.
Claim 15
Dependent Claim
87 words
An electrical contact material which consists of a mixture of at least one material selected from a first group which comprises palladium, ruthenium, rhodium and rhenium or their alloys and the silver/palladium series of contact alloys; and not more than three weight percent of at least one material selected from a second group which comprises occluded compounds of lithium, sodium, potassium, rubidium, caesium and cadmium spread uniformly throughout, or formed at discrete sites at the surface of, the said at least one material of the first group.
Claim 16
Dependent Claim
12 words
An electrical contact formed of the material set forth in claim 13.
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) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |