Patent US3666640A successfully refreshed from Google Patents.
US3666640A
Expired / Lapsed
US
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Gold plating bath and process
Assignee: Sel Rex Corp
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Filing: 1971-04-23
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Granted: 1972-05-30
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Expires: 1991-04-23
Abstract
Abstract AN ELECTROPLATING BATH AND PROCESS FOR OBTAINING NONHAZY, HARD BRILLIANT GOLD DEPOSITS BY THE ADDITION OF A SMALL QUANTITY OF A SOLUBLE ARSENIC, A SOLUBLE ANNTIMONY OR A SOLUBLE SELENIUM COMPOUND TO THE PLATING SOLUTION, OPTIONALLY INCLUDING THE ADDITION OF SOLUBLE BASE METAL SALTS AND CHELATING AGENTS TO FURTHER IMPROVE THE PROPERTIES OF THE DEPOSIT.
Inventors
- 👤 Paul T Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:55
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/48
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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |