Patent US4554425A successfully refreshed from Google Patents.
US4554425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact of vacuum interrupter and manufacturing process therefor
Assignee: Meidensha Corp
•
Filing: 1984-09-07
•
Granted: 1985-11-19
•
Expires: 2004-09-07
Abstract
Abstract A contact of a vacuum interrupter and a manufacturing process therefor are disclosed. The contact can greatly reduce the chopping current of the interrupter, can greatly increase the dielectric strength thereof and can improve the large- and small-current interrupting capabilities thereof. The contact is made of a material containing 29 to 74 weight % copper, 15 to 60 weight % chromium, 10 to 35 weight % iron, 0.5 to 15 weight % carbon and 0.5 to 15 weight % silicon. The process contains the steps of producing a porous matrix by sintering a mixture of all of the elements except copper under a nonoxidizing atmosphere, impregnating the matrix with copper and machining the resultant material.
Inventors
- 👤 Yoshiyuki Kashiwagi
- 👤 Yasushi Noda
- 👤 Kaoru Kitakizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:38
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; H01H1/0206
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
A contact of a vacuum interrupter, wherein a material of the contact consists essentially of between 29 and 74% by weight copper, between 15 and 60% by weight chromium, between 10 and 35% by weight iron, between 0.5 and 15% by weight carbon, and between 0.5 and 15% by weight silicon.
Claim 2
Dependent Claim
51 words
A contact of a vacuum interrupter, wherein a material of the contact consists essentially of between 29 and 74% by weight copper, between 15 and 60% by weight chromium, between 10 and 35% by weight iron, between 0.5 and 15% by weight carbon, and between 0.5 and 15% by weight silicon.
Claim 3
Dependent Claim
23 words
A contact as defined in claim 1, wherein all of the chromium, iron, carbon and silicon are derived from a commercial ferrochromium powder.
Claim 4
Dependent Claim
23 words
A contact as defined in claim 1, wherein part of the chromium, iron, carbon and silicon are derived from a commercial ferrochromium powder.
Claim 5
Dependent Claim
24 words
A contact as defined in claim 1, wherein the chromium, iron, carbon and silicon components form a porous matrix which is impregnated with copper.
Claim 6
Dependent Claim
24 words
A contact as defined in claim 4, wherein the porous matrix contains the chromium, iron, carbon and silicon derived from a commercial ferrochromium mixture.
Claim 7
Dependent Claim
131 words
A process for manufacturing a contact of a vacuum interrupter which comprises the steps of: producing a porous matrix consisting essentially of between 15 and 60% by weight chromium, between 10 and 35% by weight iron, between 0.5 and 15% by weight carbon, and between 0.5 and 15% by weight silicon, the respective proportions of these elements being based on a finished product and the total proportion of these elements amounting to between 26 and 71% by weight of the finished product, and a mixture of these elements being heated at a temperature below the melting point of silicon under a nonoxidizing atmosphere; impregnating the porous matrix with between 29 and 74% by weight copper on the basis of the finished product under a nonoxidizing atmosphere; and machining the resultant material.
Claim 8
Dependent Claim
131 words
A process for manufacturing a contact of a vacuum interrupter which comprises the steps of: producing a porous matrix consisting essentially of between 15 and 60% by weight chromium, between 10 and 35% by weight iron, between 0.5 and 15% by weight carbon, and between 0.5 and 15% by weight silicon, the respective proportions of these elements being based on a finished product and the total proportion of these elements amounting to between 26 and 71% by weight of the finished product, and a mixture of these elements being heated at a temperature below the melting point of silicon under a nonoxidizing atmosphere; impregnating the porous matrix with between 29 and 74% by weight copper on the basis of the finished product under a nonoxidizing atmosphere; and machining the resultant material.
References Cited (Backward Citations)
US3246979A
Cited
US3596927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |