US3648355A
Expired / Lapsed
US
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Method for making an electric contact material
Assignee: Panasonic Holdings Corp
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Filing: 1970-06-30
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Granted: 1972-03-14
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Expires: 1990-06-30
Abstract
Abstract Novel electrical contact materials are provided. The materials are comprised of three bonded layers including a top layer of palladium, an intermediate layer of a silver alloy and a nickelcopper alloy spring layer.
Inventors
- 👤 Sankichi Shida
- 👤 Tsunehiko Todoroki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:56
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B32B15/018; H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12868; Y10T428/12896; Y10T428/12903
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
60 words
A method for making an electric contact material defined by claim 1, wherein said silver alloy sheet consists essentially of 95 to 97 wt. percent of silver and 3 to 5 wt. percent of copper and each of said bonding layer and said another bonding layer consists essentially of a coppeR layer in a thickness of 20 to 50 microns.
Claim 2
Dependent Claim
57 words
A method for making an electric contact material defined claim 1, wherein said silver alloy sheet consists essentially of 60 to 94 wt. percent of silver and 6 to 40 wt. percent of copper and each of said bonding layer and said another bonding layer consists of a combination of a copper layer and an indium layer.
Claim 3
Dependent Claim
39 words
A method for making an electric contact material defined in claim 3, said combination has a thickness of 20 to 50 microns whereby a thickness ratio of said indium layer to said copper layer ranges from 1:1 to 1:2.
Claim 4
Dependent Claim
38 words
A method for making an electric contact material defined by claim 3, wherein said another bonding layer consists essentially of a combination of an indium layer and a copper layer which is adhered to said nickel-copper alloy sheet.
Claim 5
Dependent Claim
32 words
A method for making an electric contact material defined by claim 1, wherein said three layer bonded sheet has the palladium alloy top layer including 40 to 95 wt. percent of palladium.
Claim 6
Dependent Claim
57 words
A method for making an electric contact material defined by claim 1, wherein said original palladium alloy sheet is in a composition consisting essentially of 1 to 6 wt. percent of a metal selected from the group consisting of nickel and cobalt, 2 to 39 wt. percent of silver and 60 to 95 wt. percent of palladium.
Claim 7
Dependent Claim
57 words
A method for making an electric contact material defined by claim 1, wherein said original palladium alloy sheet is in a composition consisting essentially of 1 to 6 wt. percent of a metal selected from the group consisting of nickel and cobalt, 2 to 15 wt. percent of copper and 79 to 95 wt. percent of palladium.
Claim 8
Dependent Claim
53 words
A method for making an electric contact metal defined by claim 1, wherein said original palladium alloy sheet is in a composition consisting essentially of 3 to 15 wt. percent of copper, 2 to 37 wt. percent copper, 2 to 37 wt. percent of silver and 60 to 95 wt. percent of palladium.
Claim 9
Dependent Claim
47 words
A method for making an electric contact material defined by claim 1, wherein said original silver alloy sheet is in a composition consisting essentially of 60 to 96.8 wt. percent of silver, 3 to 39.95 wt. percent of copper and 0.05 to 0.2 wt. percent of phosphorous.
Claim 10
Dependent Claim
46 words
A method for making an electric contact material defined by claim 1, wherein said original silver alloy sheet is in a composition consisting essentially of 60 to 96.5 wt. percent of silver, 3 to 37 wt. percent copper and 0.5 to 3 wt. percent of nickel.
Claim 11
Dependent Claim
71 words
A method for making an electric contact material defined by claim 1, wherein said original nickel-copper alloy sheet is in a composition consisting essentially of 63.0 to 70.0 wt. percent of nickel, less than 2.5 wt. percent of iron, less than 1.25 wt. percent of manganese, less than 0.5 wt. percent of silicon, less than 0.024 wt. percent of sulfur, less than 0.08 wt. percent of carbon and the remainder copper.
Claim 12
Dependent Claim
33 words
A method for making an electric contact material defined by claim 1, wherein the rolled three layer bonded sheet has the palladium alloy top layer in a thickness of 0.5 to 5 microns.
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) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |