US3951872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact material
Assignee: Duracell Inc USA
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Filing: 1973-12-03
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Granted: 1976-04-20
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Expires: 1993-12-03
Abstract
Abstract An electrical contact material consisting essentially of a highly conductive metal such as gold or silver, a refractory constituent such as tungsten, molybdenum, tantalum, titanium, their carbides, or mixtures thereof and a bonding constituent of at least two metals that form an alloy selected from the iron group (Group VIII of the Periodic Table of the Elements), and copper. The material has improved properties including improved resistance to arc erosion, resistance to bleeding of the highly conductive metal, and resistance to welding or sticking when used as an electrical contact material.
Inventors
- 👤 Lloyd F. Neely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:08
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0233; H01B; H01B1/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A highly conductive-refractory metal containing type electrical contact material consisting essentially of about 12 wt. % to about 69 wt. % of electrically conductive metal selected from Ag and An and mixtures thereof, about 30 wt. % to about 85 wt. % total of at least two refractory constituents selected from W, Mo and Ta, and an effective amount up to about 6 wt. % of a bonding constituent consisting essentially of at least two metals that are capable of forming an alloy with each other selected from the group of Cu and the metals of Group VIII of the Periodic Table of the Elements.
Claim 2
Dependent Claim
105 words
A highly conductive-refractory metal containing type electrical contact material consisting essentially of about 12 wt. % to about 69 wt. % of electrically conductive metal selected from Ag and An and mixtures thereof, about 30 wt. % to about 85 wt. % total of at least two refractory constituents selected from W, Mo and Ta, and an effective amount up to about 6 wt. % of a bonding constituent consisting essentially of at least two metals that are capable of forming an alloy with each other selected from the group of Cu and the metals of Group VIII of the Periodic Table of the Elements.
Claim 3
Dependent Claim
34 words
The highly conductive-refractory metal containing type electrical contact material of claim 1, wherein the electrically conductive metal is Ag, the refractory constituent is W and Mo, and the bonding constituent is Ni and Cu.
Claim 4
Dependent Claim
39 words
The highly conductive-refractory metal containing type electrical contact material of claim 1, wherein the refractory constituent is W and Mo in a wt. ratio of W to Mo of from about 1 to 4 to about 4 to 1.
Claim 5
Dependent Claim
69 words
The highly conductive-refractory metal containing type electrical contact material of claim 2, wherein the material consists essentially of about 20 wt. % to about 55 wt. % Ag, about 53 wt. % to about 40 wt. % W, about 26 wt. % to about 14 wt. % Mo, an effective amount up to about 1.0 wt. % Ni, and an effective amount up to about 1.0 wt. % Cu.
Claim 6
Dependent Claim
46 words
The highly conductive refractory-metal containing type electrical contact material of claim 1, wherein the bonding constituent consists essentially of Cu and at least one metal that is capable of forming an alloy with Cu selected from the Group VIII metals of the Periodic Table of Elements.
Claim 7
Dependent Claim
55 words
The highly conductive-refractory metal containing type electrical contact material of claim 2, wherein the material consists essentially of about 12 wt. % to about 69 wt. % Ag, about 30 wt. % to about 85 wt. % of the refractory constituent and an effective amount to about 3 wt. % each of Ni and Cu.
Claim 8
Dependent Claim
44 words
The highly conductive-refractory metal containing type electrical contact material of claim 4 wherein the material consists essentially of about 53 wt. % Ag, about 30 wt. % W, about 15 wt. % Mo, about 1 wt. % Ni and about 1 wt. % Cu.
Claim 9
Dependent Claim
44 words
The highly conductive-refractory metal containing type electrical contact material of claim 4, wherein the material consists essentially of about 43.9 wt. % Ag, about 37.1 wt. % W, about 18.0 wt. % Mo, about 0.9 wt. % Ni and about 0.9 wt. % Cu.
Claim 10
Dependent Claim
44 words
The highly conductive-refractory metal containing type electrical contact material of claim 4, wherein the material consists essentially of about 41.8 wt. % Ag, about 38.1 wt. % W, about 19.0 wt. % Mo, about 0.9 wt. % Ni and about 0.2 wt. % Cu.
Claim 11
Dependent Claim
44 words
The highly conductive-refractory metal containing type electrical contact material of claim 2, wherein the material consists essentially of about 43.4 wt. % Ag, about 51.8 wt. % W, about 4.0 wt. % Mo, about 0.8 wt. % Ni and about 0.2 wt. % Cu.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-20 | 1979-10-20 | 1980-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-20 | 1983-10-20 | 1984-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-20 | 1987-10-20 | 1988-04-20 | $7700.00 | Window Closed / Lapsed |