US3655368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum switch contacts
Assignee: General Electric Co
•
Filing: 1970-01-07
•
Granted: 1972-04-11
•
Expires: 1990-01-07
Abstract
Abstract Improved vacuum switch contact members have been fabricated from an electrically conductive hard metallic matrix containing a dispersoid of an electrically conductive metallic material which is insoluble in the matrix and which has a relatively high vapor pressure when heated by an arc developed between two such contact members. A specific example of a 96 weight per cent nickel, two per cent beryllium and 2 per cent bismuth composition is disclosed.
Inventors
- 👤 John L Walter
- 👤 Harvey E Cline
- 👤 James D Cobine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:55
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/007; H; H01; H01H; H01H1/00; H01H1/02; H01H1/0203
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
104 words
An article of manufacture comprising an electrically conductive contact member having a contact surface consisting essentially of an electrically conductive hard metallic matrix and a dispersoid of an electrically conductive metallic material which has a high vapor pressure when exposed to the heat of an electric arc at a surface of said member, said dispersaid material being substantially insoluble in said matrix material and substantially evenly distributed therethrough, said matrix being composed primarily of nickel and said dispersoid being bismuth, said contact member surface being composed essentially of about 96 per cent by wt. nickel, 2 per cent beryllium and 2 per cent bismuth.
References Cited (Backward Citations)
US3437479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |