§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4374311A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrical multilayer contact

Assignee: SDS Elektro GmbH
•
Filing: 1981-07-13
•
Granted: 1983-02-15
•
Expires: 2001-07-13
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An electrical multilayer contact, specifically for relays, comprises the following layers disposed upon each other on a contact support member: a first layer of a copper-nickel alloy for mechanically and electrically connecting the further layers to the support member, a second layer consisting of silver or having a very high silver content for adhering the further layers to the first layer, a third layer of a silver-tin oxide composition, a fourth layer of silver or a silver alloy, and a fifth layer of gold or an alloy having a high gold content. This multilayer structure is preferably used for both, the fixed contact member and the movable contact member of a relay contact couple. In this case, the upper surface of the multilayer contact structure disposed on the fixed contact is plane, while that on the movable contact is curved in one direction to cooperate with the opposite plane surface in forming a line contact.

Inventors

  • 👤 Keiji Okahashi
  • 👤 Masanori Motoyama
  • 👤 Satoru Furukawa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 08:16
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12882; Y10T428/12889; Y10T428/12896

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 81 words
An electrical multilayer contact, comprising the following layers disposed upon each other on a contact support member: a first layer of a copper-nickel alloy forming a mechanical and electrical connection to said support member, a second layer having a very high silver content of up to 100%, a third layer of a silver-tin oxide composition, a fourth layer of a silver alloy containing up to a 100% silver, and a fifth layer of a gold alloy containing up to 100% gold.
Claim 2
Dependent Claim 81 words
An electrical multilayer contact, comprising the following layers disposed upon each other on a contact support member: a first layer of a copper-nickel alloy forming a mechanical and electrical connection to said support member, a second layer having a very high silver content of up to 100%, a third layer of a silver-tin oxide composition, a fourth layer of a silver alloy containing up to a 100% silver, and a fifth layer of a gold alloy containing up to 100% gold.
Claim 3
Dependent Claim 23 words
The contact of claim 1, wherein said fourth layer contains 85% silver and 15% nickel and has a thickness of about 0.06 mm.
Claim 4
Dependent Claim 16 words
The contact of claim 1, wherein said third layer contains 90.7% silver and 9.3% tin oxide.
Claim 5
Dependent Claim 16 words
The contact of claim 1, wherein said third layer has a thickness of about 0.14 mm.
Claim 6
Dependent Claim 17 words
The contact of claim 1, wherein said second layer has a silver content of at least 99%.
Claim 7
Dependent Claim 16 words
The contact of claim 1, wherein said second layer has a thickness of about 0.025 mm.
Claim 8
Dependent Claim 23 words
The contact of claim 1, wherein said first layer contains 70% copper and 30% nickel and has a thickness of about 0.07 mm.
Claim 9
Dependent Claim 38 words
A contact system comprising a fixed contact member and a movable contact member cooperating with said fixed contact member, wherein either one of said fixed and movable contact members comprises the multilayer contact structure defined in claim 1.
Claim 10
Dependent Claim 56 words
The contact system of claim 8, wherein the multilayer contact structure provided on said fixed contact member has a plane upper surface and the multilayer contact structure provided on said movable contact member has an upper surface curved in one plane so that the upper surfaces of both contact members cooperate to form a line contact.
Claim 11
Dependent Claim 30 words
The contact system of claim 8, wherein said movable contact member is provided with a longitudinal slot at its end carrying said multilayer contact structure, to form a double contact.

References Cited (Backward Citations)

CH238227A Cited
US2486341A Cited
US3576415A Cited
DE2259792A1 Cited
DE2403048A1 Cited
DE2524743A1 Cited
JPS5566812A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1986-02-14 1986-08-16 1987-02-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1990-02-14 1990-08-16 1991-02-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1994-02-14 1994-08-16 1995-02-15 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag