US4049471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for stabilizing contact resistance of gold plated electrical contacts
Assignee: AT&T Inc
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Filing: 1976-07-26
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Granted: 1977-09-20
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Expires: 1996-07-26
Abstract
Abstract A technique is described for stabilizing gold plated electrical contacts wherein the contacts are treated with an oxidizing agent at elevated temperatures, so resulting in a contact structure which does not evidence resistance drift during subsequent thermal aging. Additionally, the technique may be used to reduce the contact resistance of thermally aged contacts which were not subjected to the foregoing preparative process.
Inventors
- 👤 Donald Eldridge Koontz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:06
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H11/00; H01H11/04; H01H11/041; H01H2011/046
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
41 words
Technique for stabilizing the resistance of gold plated electrical contacts which comprises immersing the contact in a boiling oxidizing agent for a time period ranging from 1-3 minutes, the reduction products of the oxidizing agent being water soluble at elevated temperatures.
Claim 2
Dependent Claim
41 words
Technique for stabilizing the resistance of gold plated electrical contacts which comprises immersing the contact in a boiling oxidizing agent for a time period ranging from 1-3 minutes, the reduction products of the oxidizing agent being water soluble at elevated temperatures.
Claim 3
Dependent Claim
14 words
Technique in accordance with claim 1 wherein stabilization is effected prior to thermal aging.
Claim 4
Dependent Claim
14 words
Technique in accordance with claim 1 wherein stabilization is effected subsequent to thermal aging.
Claim 5
Dependent Claim
13 words
Technique in accordance with claim 1 wherein the oxidizing agent is hydrogen peroxide.
Claim 6
Dependent Claim
21 words
Technique in accordance with claim 4 wherein said hydrogen peroxide has a concentration ranging from 1-5 percent, by volume in water.
References Cited (Backward Citations)
US3314827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |