US3723138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of silvering solutions
Assignee: PPG Industries Inc
•
Filing: 1971-09-09
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Granted: 1973-03-27
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Expires: 1991-09-09
Abstract
Abstract ELECTROLESS PLATING SOLUTIONS CONTAINING SILVER CATIONS, WHICH HERETOFORE HAVE BEEN PLAGUED BY LIMITED POT LIFE AND BY THE PRECIPITATION OF DARK PRECIPITATES DURING USE, ARE STABILIZED BY THE INCLUSION THEREIN OF A PERSULFATE, PARTICULARLY AMMONIUM PERSULFATE.
Inventors
- 👤 H Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:29
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/42
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |