US2814589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of plating silicon
Assignee: AT&T Inc
•
Filing: 1955-08-02
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Granted: 1957-11-26
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Expires: 1975-08-02
Abstract
No abstract record available.
Inventors
- 👤 Maynard C Waltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
C; C25; C25D; C25D7/00; C25D7/12; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/38; H; H10; H10P; H10P14/00; H10P14/40; H10P14/46; H10P14/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
THE PROCESS OF COATING A PREDOMINATLY SILICON BODY COMPRISING ELECTROPLATING A GOLD-ANTIMONY LAYER ON A MAJOR FACE OF WAFER OF SEMICONDUCTIVE MATERIAL COMPRISING SILICONE, HEATING SAID WAFER TO ABOUT 920 DEGREES CONTIGRADE FOR FIVE TO TEN MINUTES TO FORM A GOLD-ANTIMONY-SILICON ALLOY BOND, COOLING SAID WAFER TO ABOUT 100 DEGREES CENTIGRADE OVER A TEN MINUTE PERIOD, AND DEPOSITING A LAYER OF COPPER ON SAID GOLD-ANTIMONY LAYER BY DISPLACEMENT OF COPPER IONS FROM AN ELECTROLYTE BY IMMERSING THE WAFER IN AN ELECTROLYTE COMPRISING COPPER SULFATE AND HYDROFLUORIC ACID.
Claim 2
Dependent Claim
87 words
THE PROCESS OF COATING A PREDOMINATLY SILICON BODY COMPRISING ELECTROPLATING A GOLD-ANTIMONY LAYER ON A MAJOR FACE OF WAFER OF SEMICONDUCTIVE MATERIAL COMPRISING SILICONE, HEATING SAID WAFER TO ABOUT 920 DEGREES CONTIGRADE FOR FIVE TO TEN MINUTES TO FORM A GOLD-ANTIMONY-SILICON ALLOY BOND, COOLING SAID WAFER TO ABOUT 100 DEGREES CENTIGRADE OVER A TEN MINUTE PERIOD, AND DEPOSITING A LAYER OF COPPER ON SAID GOLD-ANTIMONY LAYER BY DISPLACEMENT OF COPPER IONS FROM AN ELECTROLYTE BY IMMERSING THE WAFER IN AN ELECTROLYTE COMPRISING COPPER SULFATE AND HYDROFLUORIC ACID.
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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) | 1960-11-25 | 1961-05-27 | 1961-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-25 | 1965-05-27 | 1965-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-25 | 1969-05-27 | 1969-11-26 | $7700.00 | Window Closed / Lapsed |