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Patent US4859238A successfully refreshed from Google Patents.
US4859238A
Expired / Lapsed
US
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Silver-iron material for electrical contacts
Assignee: Evonik Operations GmbH
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Filing: 1988-06-03
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Granted: 1989-08-22
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Expires: 2008-06-03
Abstract
Abstract Electrical contacts are formed from a silver-iron material which contains 3 to 30% by weight of iron and one or more of the components manganese, copper, zinc, antimony, bismuth oxide, molybdenum oxide, tungsten oxide or chromium nitride in amount totalling 0.05 to 5 weight percent, the balance being silver. These materials are suitable for forming electrical contacts of a wide variety. Tantalum is an optional component which may also be utilized particularly when 0.2 percent to 2 percent zinc is present.
Inventors
- 👤 Wolfgang Weise
- 👤 Roger Wolmer
- 👤 Peter Braumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:20
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
50 words
A material suitable for the formation of electrical contacts comprising 3 to 30 weight percent iron, and one or more of the additives manganese, copper, zinc, antimony, bismuth oxide, molybdenum oxide, tungsten oxide, chromium nitride in a total amount of 0.05 to 5 weight percent and the balance being silver.
Claim 2
Dependent Claim
50 words
A material suitable for the formation of electrical contacts comprising 3 to 30 weight percent iron, and one or more of the additives manganese, copper, zinc, antimony, bismuth oxide, molybdenum oxide, tungsten oxide, chromium nitride in a total amount of 0.05 to 5 weight percent and the balance being silver.
Claim 3
Dependent Claim
22 words
The material as set forth in claim 1, wherein the additives are present in an amount of 0.2 to 2 weight percent.
Claim 4
Dependent Claim
20 words
The material of claim 1 which contain 0.2 to 2 percent manganese, copper, zinc, and/or antimony and the balance silver.
Claim 5
Dependent Claim
25 words
The material as set forth in claim 1 which contains 0.2 to 2 percent bismuth oxide, molybdenum oxide and/or tungsten oxide and the balance silver.
Claim 6
Dependent Claim
14 words
The material of claim 1 which additionally contains from 0 to 2 percent tantalum.
Claim 7
Dependent Claim
25 words
The material as set forth in claim 5 which contains 0.2 to 2 percent zinc and 0 to 2 percent copper, antimony and or tantalum.
Claim 8
Dependent Claim
19 words
The material in accordance with claim 1 which contains 0.2 to 2 percent molybdenum oxide and the balance silver.
Claim 9
Dependent Claim
12 words
An electrical contact made from the composition in accordance with claim 1.
Claim 10
Independent Claim
69 words
A method of making an electrical contact comprising forming a mixture of powdered components having the following composition: 3 to 30% by weight iron, one or more finely divided manganese, copper, zinc, antimony, bismuth oxide, molybdenum oxide, tungsten oxide and chromium nitride in a total amount of 0.05 to 5 weight percent and the balance silver, shaping the powdered mixture and forming the desired electrical contact from said mixture.
Claim 11
Independent Claim
69 words
A method of making an electrical contact comprising forming a mixture of powdered components having the following composition: 3 to 30% by weight iron, one or more finely divided manganese, copper, zinc, antimony, bismuth oxide, molybdenum oxide, tungsten oxide and chromium nitride in a total amount of 0.05 to 5 weight percent and the balance silver, shaping the powdered mixture and forming the desired electrical contact from said mixture.
Claim 12
Dependent Claim
12 words
A rectangular bar electrical contact formed from a composition of claim 1.
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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) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |