Patent US3814640A successfully refreshed from Google Patents.
US3814640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing composite silvercadmium oxide alloy contact with silver-cadmium surface
Assignee: Chugai Electric Industrial Co Ltd
•
Filing: 1972-04-10
•
Granted: 1974-06-04
•
Expires: 1992-04-10
Abstract
Abstract A COMPOSITE ELECTRIC CONTACT COMPRISING A SILVERCADMIUM OXIDE ALLOY AS THE CONTACT MATERIAL OR ELEMENT AND HAVING A SILVER-CADMIUM LAYER INTEGRALLY FORMED ON THE FACE OPPOSITE TO THE CONTACT FACE IS PREPARED BY APPLYING AN ANTI-OXIDANT LAYER TO THE CONTACT-FORMING FACE, OXIDIZING THE CONTACT MATERIAL WITH AN OXIDIZING ATMOSPHERE, THEN REDUCING THE OXIDIZED FACE TO FORM AN INTEGRAL SILVER-CADMIUM LAYER ON THE FACE OPPOSITE SAID CONTACTFORMING FACE AND THEN REMOVING THE ANTI-OXIDANT LAYER.
Inventors
- 👤 A Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:54
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0231; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T428/00; Y10T428/26; Y10T428/263
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |