US4279649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact material
Assignee: NTT Inc
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Filing: 1979-06-11
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Granted: 1981-07-21
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Expires: 1999-06-11
Abstract
Abstract An electrical contact material and method of producing the same are provided. The material is an internally oxidized silver eutectic alloy system with a main component of silver to which at least one of silicon and germanium is added and, for characteristic improvement purpose, at least one selected from at least one of the groups consisting respectively of gold, platinum and the like, titanium, rhenium and the like, and iron, cobalt and the like is further added. In producing the material, an ingot of said alloy is hot-worked and then internally oxidized at a temperature in a range from 250 DEG C. to the eutectic temperature of the alloy.
Inventors
- 👤 Koichi Fujiwara
- 👤 Coro Yamauchi
- 👤 Kishio Arita
- 👤 Shigeyuki Tsurumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:15
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; H01H2001/0208
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
An electrical contact material comprising a silver eutectic alloy comprising Ag as the main component and an additive comprising: (a) at least one element selected from the group consisting of Si and Ge in an amount of 1 to 17 at.%; and (b) at least one element selected from the group consisting of Au, Pt, Pd, Rh, Ru, Os and Ir in an amount of 1 to 10 at.%. said elements being in the form of fine crystals uniformly dispersed in said Ag and internally oxidized and said at.% based on the weight of the material.
Claim 2
Dependent Claim
96 words
An electrical contact material comprising a silver eutectic alloy comprising Ag as the main component and an additive comprising: (a) at least one element selected from the group consisting of Si and Ge in an amount of 1 to 17 at.%; and (b) at least one element selected from the group consisting of Au, Pt, Pd, Rh, Ru, Os and Ir in an amount of 1 to 10 at.%. said elements being in the form of fine crystals uniformly dispersed in said Ag and internally oxidized and said at.% based on the weight of the material.
Claim 3
Dependent Claim
37 words
The electrical contact material of claim 1 further including at least one additional element selected from the group consisting of Ti, V, Zr, Nb, Mo, Ta, W and Re in an amount of 1 to 5 at.%.
Claim 4
Dependent Claim
33 words
The electrical contact material of claim 1 further including at least one additional element selected from the group consisting of Fe, Co, Ni, and Cu in an amount of 1 to 5 at.%.
Claim 5
Dependent Claim
97 words
An electrical contact material comprising a silver eutectic alloy comprising Ag as the main component and an additive comprising: (a) at least one element selected from the group consisting of Si and Ge in an amount of 1 to 17% at.%; and (b) at least one element selected from the group consisting of Ti, V, Zr, Nb, Mo, Ta, W, and Re in an amount of 1 to 5 at.%. said elements being in the form of fine crystals uniformly dispersed in said Ag and internally oxidized and said at.% based on the weight of the material.
Claim 6
Dependent Claim
97 words
An electrical contact material comprising a silver eutectic alloy comprising Ag as the main component and an additive comprising: (a) at least one element selected from the group consisting of Si and Ge in an amount of 1 to 17% at.%; and (b) at least one element selected from the group consisting of Ti, V, Zr, Nb, Mo, Ta, W, and Re in an amount of 1 to 5 at.%. said elements being in the form of fine crystals uniformly dispersed in said Ag and internally oxidized and said at.% based on the weight of the material.
Claim 7
Dependent Claim
93 words
An electrical contact material comprising a silver eutectic alloy comprising Ag as the main component and an additive comprising: (a) at least one element selected from the group consisting of Si and Ge in an amount of 1 to 17 at.%; and (b) at least one element selected from the group consisting of Fe, Co, Ni and Cu in an amount of 1 to 5 at.%; said elements being in the form of fine crystals uniformly dispersed in said Ag and internally oxidized and said at.% based on the weight of the material.
Claim 8
Dependent Claim
93 words
An electrical contact material comprising a silver eutectic alloy comprising Ag as the main component and an additive comprising: (a) at least one element selected from the group consisting of Si and Ge in an amount of 1 to 17 at.%; and (b) at least one element selected from the group consisting of Fe, Co, Ni and Cu in an amount of 1 to 5 at.%; said elements being in the form of fine crystals uniformly dispersed in said Ag and internally oxidized and said at.% based on the weight of the material.
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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |