Patent US4517033A successfully refreshed from Google Patents.
US4517033A
Expired / Lapsed
US
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Contact material for vacuum circuit breaker
Assignee: Mitsubishi Electric Corp
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Filing: 1983-10-31
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Granted: 1985-05-14
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Expires: 2003-10-31
Abstract
Abstract A contact material for a vacuum circuit breaker consists essentially of copper as the basic component, and, as the other components, 35% by weight or below of chromium and 50% by weight or below of tantalum, the total quantity of chromium and tantalum in said contact material being 10% by weight and above.
Inventors
- 👤 Mitsuhiro Okumura
- 👤 Eizo Naya
- 👤 Michinosuke Demizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:50
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H1/0206
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
62 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other component, an amount of chromium between 0.0 and up to 35% weight and an amount of tantalum between 0.0 and up to 50% weight, the total quantity of chromium and tantalum in said contact material being 10% by weight and above.
Claim 2
Dependent Claim
62 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other component, an amount of chromium between 0.0 and up to 35% weight and an amount of tantalum between 0.0 and up to 50% weight, the total quantity of chromium and tantalum in said contact material being 10% by weight and above.
Claim 3
Dependent Claim
30 words
The contact materiaL for a vacuum circuit breaker according to claim 1, wherein the total quantity of chromium and tantalum is in a range of 65% by weight or below.
Claim 4
Dependent Claim
38 words
The contact material for a vacuum circuit breaker according to claim 1, wherein chromium is in a range of from 5 to 30% by weight, and tantalum is in a range of from 5 to 30% by weight.
Claim 5
Dependent Claim
66 words
The contact material for a vacuum circuit breaker according to claim 1, wherein copper, chromium and tantalum are distributed therein in the form of a single metal or as at least one kind of a ternary alloy of these metals, a binary alloy of these metals, a ternary intermetallic compound of these metals, a binary intermetallic compound of these metals, and a composite body of these.
Claim 6
Dependent Claim
60 words
The contact material for a vacuum circuit breaker according to claim 1, further containing 20% by weight or below of at least one kind of low melting point metals selected from the group consisting of bismuth, tellurium, antimony, thallium, lead, selenium, cerium, and calcium, and at least one kind of alloys and intermetallic compounds of said low melting point metals.
Claim 7
Dependent Claim
46 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other component, 10-35% by weight of chromium, an amount of tantalum between 0.0 and up to 20% weight and up to 5% by weight of titanium.
Claim 8
Dependent Claim
46 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other component, 10-35% by weight of chromium, an amount of tantalum between 0.0 and up to 20% weight and up to 5% by weight of titanium.
Claim 9
Dependent Claim
23 words
The contact material for a vacuum circuit breaker according to claim 6, wherein the quantity of titanium is 3% by weight or below.
Claim 10
Dependent Claim
23 words
The contact material for a vacuum circuit breaker according to claim 6, wherein the quantity of titanium is 0.8% by weight or below.
Claim 11
Dependent Claim
38 words
The contact material for a vacuum circuit breaker according to claim 6, wherein tantalum is in the range of from 3.5 to 18% by weight, and titanium is in the range of from 0.8% by weight or below.
Claim 12
Dependent Claim
37 words
The contact material for a vacuum circuit breaker according to claim 6, wherein tantalum is in the range of from 3.5 to 15% by weight, and titanium is in the range of 0.8% by weight or below.
Claim 13
Dependent Claim
47 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other components, 10 to 35% by weight of chromium, an amount of tantalum between 0.0 and up to 20% weight and 3% by weight or of aluminum.
Claim 14
Dependent Claim
47 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other components, 10 to 35% by weight of chromium, an amount of tantalum between 0.0 and up to 20% weight and 3% by weight or of aluminum.
Claim 15
Dependent Claim
24 words
The contact material for a vacuum circuit breaker according to claim 11, wherein aluminum is in a range of 0.8% by weight or below.
Claim 16
Dependent Claim
25 words
The contact material for a vacuum circuit breaker according to claim 11, wherein tantalum is in the range of from 5 to 18% by weight.
Claim 17
Dependent Claim
25 words
The contact material for a vacuum circuit breaker according to claim 11, wherein tantalum is in the range of from 5 to 15% by weight.
Claim 18
Dependent Claim
60 words
The contact material for a vacuum circuit breaker according to claim 11, further containing 20% by weight or below of at least one kind of low melting metals selected from the group consisting of bismuth, tellurium, antimony, thallium, lead, selenium, cerium, and calcium, and at least one kind of alloys, intermetallic compounds, and oxides of said low melting point metals.
Claim 19
Dependent Claim
48 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other components, 10 to 35% by weight of chromium, an amount of tantalum between 0.0 and up to 20% weight and 2% by weight or below of zirconium.
Claim 20
Dependent Claim
48 words
A contact material for a vacuum circuit breaker which consists essentially of copper as the basic component, and, as the other components, 10 to 35% by weight of chromium, an amount of tantalum between 0.0 and up to 20% weight and 2% by weight or below of zirconium.
Claim 21
Dependent Claim
24 words
The contact material for a vacuum circuit breaker according to claim 16, wherein zirconium is in the range of 0.65% by weight or below.
Claim 22
Dependent Claim
27 words
The contact material for a vacuum circuit breaker according to claim 16, wherein tantalum is in the range of from 4.5 to 18% by weight or below.
Claim 23
Dependent Claim
27 words
The contact material for a vacuum circuit breaker according to claim 16, wherein tantalum is in the range of from 4.5 to 15% by weight or below.
Claim 24
Dependent Claim
61 words
The contact material for a vacuum circuit breaker according to claim 16, further containing 20% by weight or below of at least one kind of low melting point metals selected from the group consisting of bismuth, tellurium, antimony, thallium, lead, selenium, cerium, and calcium, and at least one kind of alloys, intermetallic compounds, and oxides of said low melting point metals.
References Cited (Backward Citations)
US2281691A
Cited
US2218073A
Cited
JPS499294A
Cited
US4007039A
Cited
US4008081A
Cited
JPS5822345A
Cited
GB2106141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-13 | 1988-11-12 | 1989-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-13 | 1992-11-12 | 1993-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-13 | 1996-11-12 | 1997-05-14 | $7700.00 | Window Closed / Lapsed |