US3661569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low energy contacts
Assignee: Battelle Memorial Institute Inc
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Filing: 1969-06-19
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Granted: 1972-05-09
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Expires: 1989-06-19
Abstract
Abstract High silver content (30 percent, by weight, or greater) gold base alloys are found to have exceptional resistance to silver sulfide tarnish when alloyed with from 0.25 to 10 percent, by weight, indium or preferably indium and cadmium each within the range of 0.25 to 10 percent and such alloys including those containing cadmium alone have been found to exhibit exceptional resistance to carbon film deposits in normal low energy switch applications and frictional polymer formation in sliding low energy applications.
Inventors
- 👤 William H Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:13
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; C; C22; C22C; C22C5/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
23 words
The alloy of claim 1 wherein both cadmium and indium are present, each within the range of 0.25 to 10 percent, by weight.
Claim 2
Dependent Claim
24 words
A gold-base alloy consisting of from 30 to 60 percent, by weight, silver, from 0.25 to 10 percent, by weight, indium, balance essentially gold.
Claim 3
Dependent Claim
71 words
An electrical contact formed of an alloy that consists essentially of from 30 to 60 percent, by weight, silver, 0.25 to 10 percent, by weight, of at least one element selected from the group cadmium and indium, balance gold, said contact having the properties of high resistance to carbon film build up on contacting surfaces in normal low energy applications and high resistance to frictional polymer formation in low energy applications.
Claim 4
Dependent Claim
25 words
The contact of claim 4 wherein the alloy contains both cadmium and indium each within a range of from 0.25 to 10 percent, by weight.
Claim 5
Dependent Claim
22 words
The contact of claim 4 wherein the alloy contains indium and has the property of a high resistance to silver sulfide tarnish.
Claim 6
Dependent Claim
24 words
The contact of claim 4 wherein the alloy contains indium plus cadmium and has the property of a high resistance to silver sulfide tarnish.
References Cited (Backward Citations)
US2371240A
Cited
US2400003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |