US4575451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact material for vacuum circuit breaker
Assignee: Mitsubishi Electric Corp
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Filing: 1983-11-16
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Granted: 1986-03-11
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Expires: 2003-11-16
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 niobium, the total quantity of chromium and niobium in said contact material being 10% by weight and above.
Inventors
- 👤 Eizo Naya
- 👤 Mitsuhiro Okumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:52
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H1/0206
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
56 words
A contact material for a vacuum circuit breaker, which consists essentially of: copper as the basic component, and, as the other component, from 5 to 35% by weight of chromium and from 1% to 40% by weight of niobium, the total quantity of chromium and niobium in said contact material being at least 10% by weight.
Claim 2
Dependent Claim
56 words
A contact material for a vacuum circuit breaker, which consists essentially of: copper as the basic component, and, as the other component, from 5 to 35% by weight of chromium and from 1% to 40% by weight of niobium, the total quantity of chromium and niobium in said contact material being at least 10% by weight.
Claim 3
Dependent Claim
27 words
The contact material for a vacuum circuit breaker according to claim 1, wherein the niobium content is in a range of from 1 to 30% by weight.
Claim 4
Dependent Claim
58 words
The contact material for a vacuum circuit breaker according to claim 1, wherein copper, chromium and niobium are distributed therein as a single metal, as a ternary alloy of these metals, as a binary alloy of these metals, as a ternary intermetallic compound of these metals, as a binary intermetallic compound of these metals, or as combinations thereof.
Claim 5
Dependent Claim
63 words
The contact material for a vacuum circuit breaker according to claim 1, further containing no more than 20% by weight of at least one low melting point metal selected from the group consisting of bismuth, tellurium, antimony, thallium, lead, selenium, cerium, and calcium, at least one alloy of said low melting point metals or an intermetallic compound of said low melting point metals.
Claim 6
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 components, 10 to 35% by weight of chromium, from 1% to 15% by weight of niobium, and no more than 1% by weight of titanium.
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 components, 10 to 35% by weight of chromium, from 1% to 15% by weight of niobium, and no more than 1% by weight of titanium.
Claim 8
Dependent Claim
24 words
The contact material for a vacuum circuit breaker according to claim 5, wherein the quantity of titanium is no more than 0.8% by weight.
Claim 9
Dependent Claim
25 words
The contact material for a vacuum circuit breaker according to claim 5, wherein niobium is in the range of from 2 to 7% by weight.
Claim 10
Dependent Claim
73 words
The contact material for a vacuum circuit breaker according to claim 5, further containing no more than 20% by weight of at least one low melting point metal selected from the group consisting of bismuth, tellurium, antimony, thallium, lead, selenium, cerium, and calcium, at least one alloy of said low melting point metals, an intermetallic compound of said low melting point metals, or at least one oxide of said low melting point metals.
Claim 11
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 components, 10 to 35% by weight of chromium, from 1% to 15% by weight of niobium, and no more than 0.8% by weight of zirconium.
Claim 12
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 components, 10 to 35% by weight of chromium, from 1% to 15% by weight of niobium, and no more than 0.8% by weight of zirconium.
Claim 13
Dependent Claim
24 words
The contact material for a vacuum circuit breaker according to claim 9, wherein the quantity of zirconium is no more than 0.65% by weight.
Claim 14
Dependent Claim
28 words
The contact material for a vacuum circuit breaker according to claim 9, wherein niobium is in the range of from no more than 2 to 7% by weight.
Claim 15
Dependent Claim
73 words
The contact material for a vacuum circuit breaker according to claim 9, further containing no more than 20% by weight of at least one low melting point metal selected from the group consisting of bismuth, tellurium, antimony, thallium, lead, selenium, cerium, and calcium, at least one alloy of said low melting point metals, an intermetallic compound of said low melting point metals, or at least one oxide of said low melting point metals.
Claim 16
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 components, 10 to 35% by weight of chromium, from 1% to 20% by weight of niobium, and no more than 1% by weight of aluminum.
Claim 17
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 components, 10 to 35% by weight of chromium, from 1% to 20% by weight of niobium, and no more than 1% by weight of aluminum.
Claim 18
Dependent Claim
24 words
The contact material for a vacuum circuit breaker according to claim 13, wherein the quantity of aluminum is no more than 0.6% by weight.
Claim 19
Dependent Claim
25 words
The contact material for a vacuum circuit breaker according to claim 13, wherein niobium is in the range of from 2 to 7% by weight.
Claim 20
Dependent Claim
73 words
The contact material for a vacuum circuit breaker according to claim 13, further containing no more than 20% by weight of at least one low melting point metal selected from the group consisting of bismuth, tellurium, antimony, thallium, lead, selenium, cerium, and calcium, at least one alloy of said low melting point metals, an intermetallic compound of said low melting point metals or at least one oxide of said low melting point metals.
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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) | 1989-03-10 | 1989-09-09 | 1990-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-10 | 1993-09-09 | 1994-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-10 | 1997-09-09 | 1998-03-11 | $7700.00 | Window Closed / Lapsed |