Patent US4424429A successfully refreshed from Google Patents.
US4424429A
Expired / Lapsed
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Contactor for vacuum type circuit interrupter
Assignee: Mitsubishi Electric Corp
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Filing: 1981-12-30
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Granted: 1984-01-03
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Expires: 2001-12-30
Abstract
Abstract A contactor for a vacuum type circuit interrupter having a pair of detachable electrodes in a vacuum chamber comprises an electrode obtained by melting or sintering a composition of an electric conductive metal of copper or silver as a main component and at least one metal oxide having a melting point lower than that of said conductive metal of bismuth oxide, thallium oxide, indium oxide, antimony oxide or tellurium oxide as an additive, in vacuum or a reduced atmosphere or a nonoxidative atmosphere.
Inventors
- 👤 Takashi Yamanaka
- 👤 Kouichi Inagaki
- 👤 Eizo Naya
- 👤 Michinosuke Demizu
- 👤 Mitsuhiro Okumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
A contactor for a vacuum type circuit interrupter having a pair of detachable electrodes in a vacuum chamber which comprises an electrode obtained by sintering a composition comprising an electric conductive metal which is copper or silver as a main component and at least one metal oxide having a melting point lower than that of said conductive metal, said metal oxide being bismuth oxide, thallium oxide, indium oxide, antimony oxide or tellurium oxide, as an additive, in vacuum or a reduced atmosphere or a nonoxidative atmosphere with the resulting formation of a uniformly distributed continuous network of the metal of the metal oxide in the electrode.
Claim 2
Dependent Claim
106 words
A contactor for a vacuum type circuit interrupter having a pair of detachable electrodes in a vacuum chamber which comprises an electrode obtained by sintering a composition comprising an electric conductive metal which is copper or silver as a main component and at least one metal oxide having a melting point lower than that of said conductive metal, said metal oxide being bismuth oxide, thallium oxide, indium oxide, antimony oxide or tellurium oxide, as an additive, in vacuum or a reduced atmosphere or a nonoxidative atmosphere with the resulting formation of a uniformly distributed continuous network of the metal of the metal oxide in the electrode.
Claim 3
Dependent Claim
136 words
A contactor for a vacuum type circuit interrupter having a pair of detachable electrodes in a vacuum chamber which comprises an electrode obtained by sintering a composition comprising an electric conductive metal which is copper or silver as a main component, comprising an arc resistant metal having a melting point higher than that of said conductive metal, said arc resistant metal being chromium, molybdenum, tungsten, iron or cobalt, as a sub-component and at least one metal oxide, having a melting point lower than that of said conductive metal, said metal oxide being bismuth oxide, thallium oxide, indium oxide, antimony oxide or tellurium oxide as an additive, in vacuum or a reduced atmosphere or a nonoxidative atmosphere with the resulting formation of a uniformly distributed continuous network of the metal of the metal oxide in the electrode.
Claim 4
Dependent Claim
136 words
A contactor for a vacuum type circuit interrupter having a pair of detachable electrodes in a vacuum chamber which comprises an electrode obtained by sintering a composition comprising an electric conductive metal which is copper or silver as a main component, comprising an arc resistant metal having a melting point higher than that of said conductive metal, said arc resistant metal being chromium, molybdenum, tungsten, iron or cobalt, as a sub-component and at least one metal oxide, having a melting point lower than that of said conductive metal, said metal oxide being bismuth oxide, thallium oxide, indium oxide, antimony oxide or tellurium oxide as an additive, in vacuum or a reduced atmosphere or a nonoxidative atmosphere with the resulting formation of a uniformly distributed continuous network of the metal of the metal oxide in the electrode.
Claim 5
Dependent Claim
32 words
The contactor for a vacuum type circuit interrupter according to claim 1 or 2, wherein a low melting point metal, alloy or intermetallic compound is incorporated as a sub-additive in said electrode.
Claim 6
Dependent Claim
28 words
The contactor for a vacuum type circuit interrupter according to claim 3 wherein a titanium metal, alloy or intermetallic compound is incorporated as a sub-additive in said electrode.
Claim 7
Dependent Claim
30 words
The contactor for a vacuum type circuit interrupter according to claim 1 or 2 wherein a titanium metal, alloy or intermetallic compound is incorporated as a sub-additive in said electrode.
Claim 8
Dependent Claim
33 words
The contactor of claim 1 wherein the metal oxide having a melting point lower than that of said conductive oxide is Bi 2 O 3 in amounts of 2 to 30% by weight.
Claim 9
Dependent Claim
97 words
A contactor for a vacuum type circuit interrupter according to claim 1 having a pair of detachable electrodes in a vacuum chamber which comprises an electrode obtained by sintering in a nonoxidative atmosphere a composition comprising an electric conductive metal which is copper as a main component and bismuth oxide as a metal oxide having a melting point lower than that of said conductive metal at a temperature and for a time sufficient to decompose the bismuth oxide and liberate bismuth with the resulting formation of a uniformly distributed continuous network of the bismuth in the electrode.
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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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |