US4345130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact
Assignee: Toshiba Corp
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Filing: 1980-12-03
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Granted: 1982-08-17
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Expires: 2000-12-03
Abstract
Abstract Disclosed is an electrical contact of composite layer type which comprises an interrupting layer consisting of Cu-W alloy, Cu-WC alloy or Cu-W-WC alloy containing 20 to 60 wt % of Cu and being bonded to the top surface of a base plate, and a contacting layer consisting of Ag-WC alloy, Ag-W alloy or Ag-W-WC alloy containing 20 to 60 wt % of Ag and being bonded to the top surface of said interrupting layer.
Inventors
- 👤 Tsutomu Okutomi
- 👤 Masachika Iida
- 👤 Kazuyoshi Kuwabara
- 👤 Hisashi Yoshino
- 👤 Eiichi Takayanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:43
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12771; Y10T428/12861; Y10T428/12896
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
80 words
An electrical contact which comprises an interrupting layer for interrupting a large short-circuit current in a circuit breaker consisting essentially of Cu-W alloy, Cu-WC alloy or Cu-W-WC alloy containing 20 to 60 wt % of Cu and being bonded to the top surface of a base plate, and a contacting layer consisting essentially of Ag-WC alloy, Ag-W alloy or Ag-W-WC alloy containing 20 to 60 wt % of Ag and being bonded to the top surface of said interrupting layer.
Claim 2
Dependent Claim
80 words
An electrical contact which comprises an interrupting layer for interrupting a large short-circuit current in a circuit breaker consisting essentially of Cu-W alloy, Cu-WC alloy or Cu-W-WC alloy containing 20 to 60 wt % of Cu and being bonded to the top surface of a base plate, and a contacting layer consisting essentially of Ag-WC alloy, Ag-W alloy or Ag-W-WC alloy containing 20 to 60 wt % of Ag and being bonded to the top surface of said interrupting layer.
Claim 3
Dependent Claim
23 words
An electrical contact according to claim 1, wherein said interrupting layer consists of Cu-W alloy and said contacting layer consists of Ag-WC alloy.
Claim 4
Dependent Claim
23 words
An electrical contact according to claim 1, wherein said interrupting layer consists of Cu-WC alloy and said contacting layer consists of Ag-WC alloy.
Claim 5
Dependent Claim
23 words
An electrical contact according to claim 1, wherein said interrupting layer consists of Cu-W alloy and said contacting layer consists of Ag-W alloy.
Claim 6
Dependent Claim
23 words
An electrical contact according to claim 1, wherein said interrupting layer consists of Cu-WC alloy and said contacting layer consists of Ag-W alloy.
Claim 7
Dependent Claim
23 words
An electrical contact according to claim 1, wherein said interrupting layer consists of Cu-W-WC alloy and said contacting layer consists of Ag-W-WC alloy.
Claim 8
Dependent Claim
97 words
In a circuit breaker suitable for interrupting a large short-circuit current and for use as a no-fuse circuit breaker, the improvement comprising an interrupting layer for interrupting a large short-circuit current in a circuit breaker consisting essentially of Cu-W alloy, Cu-WC alloy or Cu-W-WC alloy containing 20 to 60 wt % of Cu and being bonded to the top surface of a base plate, and a contacting layer consisting essentially of Ag-WC alloy, Ag-W alloy or Ag-W-WC alloy containing 20 to 60 wt % of Ag and being bonded to the top surface of said interrupting layer.
Claim 9
Dependent Claim
97 words
In a circuit breaker suitable for interrupting a large short-circuit current and for use as a no-fuse circuit breaker, the improvement comprising an interrupting layer for interrupting a large short-circuit current in a circuit breaker consisting essentially of Cu-W alloy, Cu-WC alloy or Cu-W-WC alloy containing 20 to 60 wt % of Cu and being bonded to the top surface of a base plate, and a contacting layer consisting essentially of Ag-WC alloy, Ag-W alloy or Ag-W-WC alloy containing 20 to 60 wt % of Ag and being bonded to the top surface of said interrupting layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |