US3685134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electrical contact materials
Assignee: Duracell Inc USA
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Filing: 1970-05-15
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Granted: 1972-08-22
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Expires: 1990-05-15
Abstract
Abstract An electrical contact material consisting of a thin cold rolled material constructed of a high electrically and thermally conductive material and a refractory wherein particles of the refractory are dispersed within a matrix of the high electrically and thermally conductive material and also are layered in a predetermined direction.
Inventors
- 👤 Philip L Blue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:37
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/025; B; B22; B22F; B22F3/00; B22F3/12; B22F3/16; C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052; H01B; H01B1/00; Y; Y10; Y10S; Y10S29/00; Y10S29/031; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T29/49206
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
12 words
A process according to claim 1, wherein said refractory material is tungsten.
Claim 2
Dependent Claim
33 words
A process according to claim 1, wherein said high electrically and thermally conductive material is in an amount of from about 50-80 percent by weight of said body, the balance being tungsten carbide.
Claim 3
Dependent Claim
30 words
A process according to claim 1, wherein said high electrically and thermally conductive material is in an amount of from about 50-80 percent of said body, the balance being molybdenum.
Claim 4
Dependent Claim
37 words
A process according to claim 1, wherein said material of high electrically and thermally conductive material is copper in an amount of from about 20-50 percent by weight of said body, the balance being said refractory material.
Claim 5
Dependent Claim
20 words
A process according to claim 5, wherein said refractory material is taken from the group consisting of tungsten and molybdenum.
Claim 6
Dependent Claim
34 words
A process according to claim 1, wherein said high electrically and thermally conductive material is copper in an amount of from about 25-50 percent by weight of said body, the balance being tungsten carbide.
Claim 7
Dependent Claim
13 words
A process according to claim 1, wherein said non-oxidizing atmosphere is dissociated ammonia.
Claim 8
Dependent Claim
34 words
A process according to claim 1, wherein said refractory material has a particle size of from 4-20 microns and said high electrically and thermally conductive material has a particle size of from 4-10 microns.
Claim 9
Dependent Claim
39 words
A process according to claim 1, wherein said sintering is carried out at a temperature which is inversely proportional to the refractory particle size such that there will be no bleed-out of the high electrically and thermally conductive material.
Claim 10
Dependent Claim
12 words
A process according to claim 1, wherein said rolling is cold rolling.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |