US4501941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum interrupter contact material
Assignee: Westinghouse Electric Corp
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Filing: 1982-10-26
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Granted: 1985-02-26
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Expires: 2002-10-26
Abstract
Abstract A vacuum interrupter electrical contact which exhibits an improved voltage withstand characteristic. The electrical contact comprises a minor portion of selected refractory metal and a major portion of dispersion strengthened copper.
Inventors
- 👤 Sidney J. Cherry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:43
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H1/0206
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
31 words
An improved vacuum interrupter electrical contact which exhibits an improved high voltage withstand characteristic and comprises a minor proportion of selected refractory metal, and a major proportion of dispersion strengthened copper.
Claim 2
Dependent Claim
31 words
An improved vacuum interrupter electrical contact which exhibits an improved high voltage withstand characteristic and comprises a minor proportion of selected refractory metal, and a major proportion of dispersion strengthened copper.
Claim 3
Dependent Claim
15 words
The electrical contact set forth in claim 1, wherein the selected refractory metal is chromium.
Claim 4
Dependent Claim
23 words
The electrical contact set forth in claim 2, wherein the weight ratio of dispersion strengthened copper to chromium is about 3 to 1.
Claim 5
Dependent Claim
20 words
The electrical contact set forth in claim 1, wherein the dispersion strengthened copper includes aluminum oxide as the dispersing medium.
Claim 6
Dependent Claim
29 words
The electrical contact set forth in claim 4, wherein the weight ratio of copper to aluminum oxide in the dispersion strengthened copper is greater than about 98.9 to 1.1.
Claim 7
Dependent Claim
65 words
An improved vacuum interrupter electrical contact which exhibits an improved high voltage withstand characteristic, which contact comprises dispersion strengthened copper and chromium, with the weight ratio of dispersion strengthened copper to chromium being about 3 to 1, and wherein aluminum oxide is the dispersing agent with the copper, and wherein the weight ratio of copper to aluminum oxide is greater than about 98.9 to 1.1.
Claim 8
Dependent Claim
65 words
An improved vacuum interrupter electrical contact which exhibits an improved high voltage withstand characteristic, which contact comprises dispersion strengthened copper and chromium, with the weight ratio of dispersion strengthened copper to chromium being about 3 to 1, and wherein aluminum oxide is the dispersing agent with the copper, and wherein the weight ratio of copper to aluminum oxide is greater than about 98.9 to 1.1.
References Cited (Backward Citations)
US3818163A
Cited
US4190723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |