US4147909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered composite material as contact material for medium-voltage vacuum power circuit breakers
Assignee: Siemens AG
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Filing: 1977-04-13
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Granted: 1979-04-03
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Expires: 1997-04-13
Abstract
Abstract The invention relates to a sintered composite material as the contact material for medium-voltage vacuum power circuit breakers, particularly in the switching voltage range from 7.2 kV to 36 kV. The contact material is comprised of a sintered composite of a burn-off-resistant metal component such as iron, cobalt, chromium, nickel, zirconium or alloys or mixtures of these metals, and a component which lowers the breaking current. As the breaking current-lowering component are provided metals, compounds or alloys of metals having a boiling point above 2400° C. such as, for example, tin, chromium carbide (Cr 3 C 2 ) or copper zirconide (ZrCu 4 , ZrCu 3 ).
Inventors
- 👤 Heinrich Hassler
- 👤 Horst Kippenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:48
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; C; C22; C22C; C22C29/00; C22C29/02; C22C29/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
66 words
In a material for use as a medium-voltage vacuum power circuit breaker in the switching voltage range of from about 7.2 kV to 36 kV, comprising a sintered composite of a burnoff-resistant metal component having a melting temperature in the range of from about 1083° C. to about 2000° C., and a breaking current-lowering component, the improvement comprising utilizing chromium carbide as said breaking current-lowering component.
Claim 2
Dependent Claim
66 words
In a material for use as a medium-voltage vacuum power circuit breaker in the switching voltage range of from about 7.2 kV to 36 kV, comprising a sintered composite of a burnoff-resistant metal component having a melting temperature in the range of from about 1083° C. to about 2000° C., and a breaking current-lowering component, the improvement comprising utilizing chromium carbide as said breaking current-lowering component.
Claim 3
Dependent Claim
30 words
The sintered composite material according to claim 1 wherein said burnoff-resistant metal component is selected from the group consisting of iron, cobalt, chromium, nickel, zirconium, and alloys or mixtures thereof.
Claim 4
Dependent Claim
66 words
In a material for use as a medium-voltage vacuum power circuit breaker in the switching voltage range of from about 7.2 kV to 36 kV, comprising a sintered composite of a burnoff-resistant metal component having a melting temperature in the range of from about 1083° C. to about 2000° C., and a breaking current-lowering component, the improvement comprising utilizing copper zirconide as said breaking current-lowering component.
Claim 5
Dependent Claim
66 words
In a material for use as a medium-voltage vacuum power circuit breaker in the switching voltage range of from about 7.2 kV to 36 kV, comprising a sintered composite of a burnoff-resistant metal component having a melting temperature in the range of from about 1083° C. to about 2000° C., and a breaking current-lowering component, the improvement comprising utilizing copper zirconide as said breaking current-lowering component.
Claim 6
Dependent Claim
65 words
In a material for use as a medium-voltage vacuum power circuit breaker in the switching voltage range of from about 7.2 kV to 36 kV, comprising a sintered composite of a burnoff-resistant metal component having a melting temperature in the range of from about 1083° to about 2000° C., and a breaking current-lowering component, the improvement comprising a utilizing tin as said breaking current-lowering component.
Claim 7
Dependent Claim
65 words
In a material for use as a medium-voltage vacuum power circuit breaker in the switching voltage range of from about 7.2 kV to 36 kV, comprising a sintered composite of a burnoff-resistant metal component having a melting temperature in the range of from about 1083° to about 2000° C., and a breaking current-lowering component, the improvement comprising a utilizing tin as said breaking current-lowering component.
Claim 8
Dependent Claim
30 words
The sintered composite material according to claim 3 wherein said burnoff-resistant metal component is selected from the group consisting of iron, cobalt, chromium, nickel, zirconium, and alloys or mixtures thereof.
Claim 9
Dependent Claim
30 words
The sintered composite material according to claim 4 wherein said burnoff-resistant metal component is selected from the group consisting of iron, cobalt, chromium, nickel, zirconium, and alloys or mixtures thereof.
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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) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |