US4579787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for low voltage current contacts
Assignee: Evonik Operations GmbH
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Filing: 1984-12-06
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Granted: 1986-04-01
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Expires: 2004-12-06
Abstract
Abstract Low voltage current contacts should have good tarnish resistance and resistance to wear at the smallest possible gold content. Such materials consist of 330 to 50 wt. % palladium, 18 to 48 wt. % silver, 19 to 33 wt. % gold, 0.01 to 1 wt. % iridium, osmium, or a mixture of iridium and osmium and either 0.5 to 5 wt. % lead or a mixture of 0.5 to 3 wt. % lead and 0.1 to 3 wt. % tin.
Inventors
- 👤 Horst Heidsiek
- 👤 Hartmuth Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:53
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01R; H01R13/00; H01R13/02; H01R13/03; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12875
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A material suitable for use as a low voltage current contact which can be applied to a carrier made of a base metal over a nickel intermediate layer consisting essentially of 33 to 50 wt. % palladium, 18 to 48 wt. % silver, 19 to 33 wt. % gold, 0.01 to 1 wt. % iridium, osmium or a mixture of iridium and osmium and either 0.5 to 5 wt. % lead or a mixture of 0.5 to 3 wt. % lead and 0.1 to 3 wt. % tin.
Claim 2
Dependent Claim
88 words
A material suitable for use as a low voltage current contact which can be applied to a carrier made of a base metal over a nickel intermediate layer consisting essentially of 33 to 50 wt. % palladium, 18 to 48 wt. % silver, 19 to 33 wt. % gold, 0.01 to 1 wt. % iridium, osmium or a mixture of iridium and osmium and either 0.5 to 5 wt. % lead or a mixture of 0.5 to 3 wt. % lead and 0.1 to 3 wt. % tin.
Claim 3
Dependent Claim
63 words
A material according to claim 1 consisting essentially of 33 to 45 wt. % palladium, 25 to 40 wt. % silver, 20 to 30 wt. % gold, 0.01 to 1 wt. % iridium, osmium, or a mixture of iridium and osmium and either 0.5 to 4 wt. % lead or 0.5 to 2 wt. % lead and 0.2 to 2 wt. % tin.
Claim 4
Dependent Claim
24 words
A low voltage current contact comprising a base metal layer, a nickel intermediate layer, and an outer layer of the material of claim 1.
Claim 5
Dependent Claim
12 words
A contact according to claim 3 which is a separable electric connector.
Claim 6
Dependent Claim
11 words
A contact according to claim 3 which is a slide contact.
Claim 7
Dependent Claim
24 words
A low voltage current contact comprising a base metal layer, a nickel intermediate layer, and an outer layer of the material of claim 2.
Claim 8
Dependent Claim
12 words
A contact according to claim 6 which is a separable electric connector.
Claim 9
Dependent Claim
11 words
A contact according to claim 6 which is a slide contact.
Claim 10
Dependent Claim
24 words
A low voltage contact comprising a layer of the material of claim 1, said layer having good tarnish resistance and good resistance to wear.
Claim 11
Dependent Claim
24 words
A low voltage contact comprising a layer of the material of claim 2, said layer having good tarnish resistance and good resistance to wear.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |