Patent US4419551A successfully refreshed from Google Patents.
US4419551A
Expired / Lapsed
US
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Vacuum circuit interrupter and method of producing the same
Assignee: Mitsubishi Electric Corp
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Filing: 1980-10-01
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Granted: 1983-12-06
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Expires: 2000-10-01
Abstract
Abstract An improved vacuum circuit interrupter, the electrode contacts of which are formed from a sintered copper-chromium alloy, with chromium dispersed in a copper matrix. The chromium particles having a mean particle size of not more than 100 μm, the copper particles having a mean particle size of not less than 5 μm, the electrode contacts have a density of not less than 90% relative to the theoretical density thereof, the copper is present at 80 to 20 wt. % and the chromium is present at 20 to 80 wt. %.
Inventors
- 👤 Masaru Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:33
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H1/0206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A vacuum circuit interrupter comprising a pair of electrode contacts engagable and disengagable from each other, each of said electrode contacts consisting of an aggregate structure formed by sintering copper particles and chromium particles together in the solid phase, whereby said chromium particles are uniformly dispersed amongst said copper particles: said chromium particles having a mean particle size of not more than 100 μm; said copper particles having a mean particle size of not less than 5 μm; said electrode contacts having a density of not less than 90% relative to the theoretical density thereof and said copper being present at 80 to 20 wt. % and said chromium being present at 20 to 80 wt. %.
Claim 2
Dependent Claim
117 words
A vacuum circuit interrupter comprising a pair of electrode contacts engagable and disengagable from each other, each of said electrode contacts consisting of an aggregate structure formed by sintering copper particles and chromium particles together in the solid phase, whereby said chromium particles are uniformly dispersed amongst said copper particles: said chromium particles having a mean particle size of not more than 100 μm; said copper particles having a mean particle size of not less than 5 μm; said electrode contacts having a density of not less than 90% relative to the theoretical density thereof and said copper being present at 80 to 20 wt. % and said chromium being present at 20 to 80 wt. %.
Claim 3
Dependent Claim
19 words
The vacuum circuit interrupter of claim 1 wherein the copper is present at from 75 to 80% by weight.
Claim 4
Dependent Claim
21 words
The vacuum circuit interrupter of claim 2 wherein copper is present at 75% by weight and chromium at 25% by weight.
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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) | 1986-12-05 | 1987-06-06 | 1987-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-05 | 1991-06-06 | 1991-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-05 | 1995-06-06 | 1995-12-06 | $7700.00 | Window Closed / Lapsed |