Patent US6646611B2 successfully refreshed from Google Patents.
US3697296A
Expired / Lapsed
US
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Electroless gold plating bath and process
Assignee: EIDP Inc
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Filing: 1971-03-09
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Granted: 1972-10-10
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Expires: 1991-03-09
Abstract
Abstract A GOLD CHEMICAL PLATING BATH IS PROVIDED FOR DEPOSITING GOLD ON A CATALYTIC SURFACE WHICH IS AN AQUEOUS SOLUTION HAVING A PH OF 1.5 TO 5 AND CONTAINS AS ESSENTIAL INGREDIENTS A SOLUBLE GOLD COMPOUND AND AN ALKALI METAL CYANOBOROHYDRIDE AS THE REDUCING AGENT. OPTIONAL, BUT PREFERRED, INGREDIENTS ARE A CHELATING AGENT AND AN ORGANIC MONOVALENT OR DIVALENT SULFUR COMPOUND. PLATING IS PREFERABLY CARRIED OUT AT A TEMPERATURE OF 80 TO 90*C.
Inventors
- 👤 Harold Edward Bellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:34
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42; C23C18/44
Claims Analysis
Total Claims: 0
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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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |