US3933485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical contact material
Assignee: Chugai Electric Industrial Co Ltd
•
Filing: 1974-05-29
•
Granted: 1976-01-20
•
Expires: 1994-05-29
Abstract
Abstract An alloy for composite electrical contact materials which is composed of 5 to 10 weight percent of tin and 1.0 to 6 weight percent of indium, the balance being silver, said alloy being subjected to an internal oxidation. The alloy may contain, when added by one or more other solute metal elements selected from zinc, antimony, lead and bismuth, as much as 6 to 15 weight percent of tin and said other solute metal elements in total in which the latter are less than 30 percent of the former. The alloy may also comprise up to 0.5 weight percent of ferrous or alkali earth metals.
Inventors
- 👤 Akira Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:45
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; H01H1/02372; H01H1/02376; C; C22; C22C; C22C5/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
42 words
Electrical contact materials comprising an alloy having metal oxides precipitated therein as the result of internal oxidation and being composed of about 5 to about 10% by weight of tin, and 1.0 to 6% by weight of indium, the balance being silver.
Claim 2
Dependent Claim
42 words
Electrical contact materials comprising an alloy having metal oxides precipitated therein as the result of internal oxidation and being composed of about 5 to about 10% by weight of tin, and 1.0 to 6% by weight of indium, the balance being silver.
Claim 3
Dependent Claim
26 words
Electrical contact materials as claimed in claim 1, the alloy containing a trace amount of less than 0.5% by weight of ferrous or alkali earth metals.
Claim 4
Dependent Claim
87 words
Electrical contact materials comprising an alloy having metal oxides precipitated therein as the result of internal oxidation at a pressure of more than 1.5 atm., and composed of 6 to 15% by weight of tin and one or more solute metal elements selected from the group consisting of zinc, antimony, lead and bismuth, said solute metal elements being less than 30% of said tin, and indium, the total amount of said tin, solute metal elements and indium being 8 to 17% by weight, the balance being silver.
Claim 5
Dependent Claim
87 words
Electrical contact materials comprising an alloy having metal oxides precipitated therein as the result of internal oxidation at a pressure of more than 1.5 atm., and composed of 6 to 15% by weight of tin and one or more solute metal elements selected from the group consisting of zinc, antimony, lead and bismuth, said solute metal elements being less than 30% of said tin, and indium, the total amount of said tin, solute metal elements and indium being 8 to 17% by weight, the balance being silver.
Claim 6
Dependent Claim
26 words
Electrical contact materials as claimed in claim 3, the alloy containing a trace amount of less than 0.5% by weight of ferrous or alkali earth metals.
References Cited (Backward Citations)
US2486341A
Cited
US2572662A
Cited
GB611813A
Cited
US2796346A
Cited
DE1153178B
Cited
US3472654A
Cited
US3607244A
Cited
DE2012910A1
Cited
DE2011002A1
Cited
US3694197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |