US4067379A
Expired / Lapsed
US
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Method for the manufacture of multilayered contacts for medium-voltage vacuum power circuit breakers
Assignee: Siemens AG
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Filing: 1976-08-11
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Granted: 1978-01-10
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Expires: 1996-08-11
Abstract
Abstract A method for producing multilayered contacts for medium-voltage vacuum power circuit breakers is provided comprising impregnating under vacuum with oxygen-free, liquid copper, a composite body of metal powders consisting of at least 35% by volume of a metal selected from the group consisting of chromium and vanadium and at least one metal selected from the group consisting of chromium, vanadium, cobalt, nickel and iron, in a crucible comprised of a metal selected from the group consisting of iron, steel, and chromium-nickel steel; and removing at least part of the crucible to expose a contact surface.
Inventors
- 👤 Heinrich Hassler
- 👤 Horst Kippenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:14
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; B22F3/26; H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
97 words
A method for preparing pore-free, multilayered contacts for medium-voltage vacuum power circuit breakers which comprises: a. impregnating under vacuum with oxygen-free, liquid copper a composite body of metal powders consisting of at least 35% by volume of a metal selected from the group consisting of chromium and vanadium and at least one metal selected from the group consisting of chromium, vanadium, cobalt, nickel and iron, in a crucible comprised of a metal selected from the group consisting of iron, steel and chromium-nickel steel; and b. removing at least part of the crucible to expose a contact surface.
Claim 2
Independent Claim
97 words
A method for preparing pore-free, multilayered contacts for medium-voltage vacuum power circuit breakers which comprises: a. impregnating under vacuum with oxygen-free, liquid copper a composite body of metal powders consisting of at least 35% by volume of a metal selected from the group consisting of chromium and vanadium and at least one metal selected from the group consisting of chromium, vanadium, cobalt, nickel and iron, in a crucible comprised of a metal selected from the group consisting of iron, steel and chromium-nickel steel; and b. removing at least part of the crucible to expose a contact surface.
Claim 3
Dependent Claim
13 words
The method according to claim 1 wherein the body is a sintered body.
Claim 4
Dependent Claim
14 words
The method according to claim 1 wherein the body is a pressed powder blank.
Claim 5
Dependent Claim
14 words
The method according to claim 1 wherein the walls of the crucible are removed.
Claim 6
Dependent Claim
40 words
The method according to claim 1 in which the crucible is made from deep-drawn sheet metal and has a central cup-shaped reentrant salient on the crucible bottom and the part of the crucible removed is the walls of the crucible.
Claim 7
Dependent Claim
96 words
The method according to claim 1 in which the crucible is made from deep-drawn sheet metal and contains means integral with the inner wall of the crucible to retain the composite body at a definite spacing above the bottom of the crucible; the body having such dimensions that the composite body fits inside the crucible, and is held at a definite spacing from the bottom of the crucible by said retaining means, said copper filling said spacing above the bottom of the crucible; and the part of the crucible removed is the walls of the crucible.
Claim 8
Dependent Claim
13 words
The method according to claim 6 wherein the crucible is a stepped crucible.
Claim 9
Dependent Claim
56 words
The method according to claim 1 wherein a flat piece of metal selected from the group consisting of iron and chromium-nickel steel is located on the bottom of the crucible, the crucible is made from deep-drawn sheet metal, the composite body is a sintered body, and the walls and the bottom of the crucible are removed.
Claim 10
Dependent Claim
15 words
The method according to claim 1 in which said body is formed outside the vessel.
Claim 11
Dependent Claim
15 words
The method according to claim 1 in which said body is formed inside the vessel.
Claim 12
Independent Claim
120 words
A method for preparing pore-free, multilayered contacts for medium voltage vacuum power circuit breakers which comprises: a. forming a composite body of sintered or pressed metal powders, consisting of at least 35% by volume of an element selected from the group consisting of chromium and vanadium and at least one element selected from the group consisting of chromium, vanadium, cobalt, nickel and iron; b. heating the composite body under vacuum with oxygen-free copper in a crucible made from deep-drawn sheet metal said metal selected from the group consisting of iron, steel and chromium-nickel steel to a temperature above the melting point of copper until said composite body is impregnated with said copper; and c. removing the walls of the crucible.
Claim 13
Independent Claim
120 words
A method for preparing pore-free, multilayered contacts for medium voltage vacuum power circuit breakers which comprises: a. forming a composite body of sintered or pressed metal powders, consisting of at least 35% by volume of an element selected from the group consisting of chromium and vanadium and at least one element selected from the group consisting of chromium, vanadium, cobalt, nickel and iron; b. heating the composite body under vacuum with oxygen-free copper in a crucible made from deep-drawn sheet metal said metal selected from the group consisting of iron, steel and chromium-nickel steel to a temperature above the melting point of copper until said composite body is impregnated with said copper; and c. removing the walls of the crucible.
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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |