Patent US3783213A successfully refreshed from Google Patents.
US3783213A
Expired / Lapsed
US
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Vacuum type electric circuit interrupter
Assignee: General Electric Co
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Filing: 1972-04-27
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Granted: 1974-01-01
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Expires: 1992-04-27
Abstract
Abstract A vacuum-type circuit interrupter comprises separable contacts, each comprising a body of iron having one or more recesses therein and a material within the recesses consisting essentially of copper and bismuth, the bismuth being present in an amount of a few percent or less by weight of the material. When the interrupter is first operated, the arcing surface of each contact is constituted by portions of copper-bismuth and by portions of iron.
Inventors
- 👤 V Amoth
- 👤 G Mitchell
- 👤 C Popadick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:23
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H2001/0205
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
The vacuum interrupter of claim 1 wherein said second metal is bismuth.
Claim 2
Dependent Claim
12 words
The vacuum interrupter of claim 1 wherein said second metal is lead.
Claim 3
Dependent Claim
53 words
The vacuum interrupter of claim 1 in which operation of said interrupter produceS on each contact a film of an alloy of copper, iron, and said second metal covering said surfaces of said recess material and said body bordering said gap and thereafter serving as the arcing and contact-making surface of said contact.
Claim 4
Dependent Claim
13 words
The vacuum interrupter of claim 4 in which said second metal is bismuth.
Claim 5
Dependent Claim
13 words
The vacuum interrupter of claim 4 in which said second metal is lead.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |