US3874941A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver-metal oxide contact materials
Assignee: Chugai Electric Industrial Co Ltd
•
Filing: 1974-02-14
•
Granted: 1975-04-01
•
Expires: 1994-02-14
Abstract
Abstract A composite electrical contact material consisting of an alloy composed of 6 to 12 weight percent of indium, and 0.5 to 5 weight percent of tin, the balance being silver, said alloy being formed into a strip or electrical contact shape and subjected to internal oxidation. Less than 0.5 weight percent of an element of the iron family is added to the alloy when it contains more than 2.5 weight percent of tin.
Inventors
- 👤 Akira Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:28
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0237; C; C22; C22C; C22C5/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
44 words
A COMPOSITE ELECTRICAL CONTACT MATERIAL CONSISTING OF AN ALLOY COMPOSED OF 6 TO 12 WEIGHT PERCENT OF INDIUM, AND 0.5 TO 5 WEIGHT PERCENT OF TIN, THE BALANCE BEING SILVER, SAID ALLOY BEING FORMED INTO A DESIRED CONFIGURATION AND SUBJECTED TO AN INTERNAL OXIDATION.
Claim 2
Dependent Claim
44 words
A COMPOSITE ELECTRICAL CONTACT MATERIAL CONSISTING OF AN ALLOY COMPOSED OF 6 TO 12 WEIGHT PERCENT OF INDIUM, AND 0.5 TO 5 WEIGHT PERCENT OF TIN, THE BALANCE BEING SILVER, SAID ALLOY BEING FORMED INTO A DESIRED CONFIGURATION AND SUBJECTED TO AN INTERNAL OXIDATION.
Claim 3
Dependent Claim
26 words
A composite electrical contact material as claimed in claim 1, in which the alloy contains less than 0.5 weight percent of element of the iron family.
Claim 4
Dependent Claim
34 words
A composite electrical contact material as claimed in claim 2, in which indium is contained in the alloy at 8 to 12 weight percent, and tin is contained at 2.6 to 5 weight percent.
Claim 5
Dependent Claim
21 words
A composite electrical contact material as claimed in claim 2, wherein the alloy contains more than 2.5 weight percent of tin.
Claim 6
Dependent Claim
19 words
A composite electrical contact material as claimed in claim 1, wherein the alloy contains less than 0.5% of nickel.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |