Patent US3717520A successfully refreshed from Google Patents.
US3717520A
Expired / Lapsed
US
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Composition and method for selectively stripping nickel and/or copper
Assignee: MacDermid Enthone Inc
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Filing: 1971-02-09
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Granted: 1973-02-20
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Expires: 1991-02-09
Abstract
Abstract STRIPPING SOLUTIONS FOR SELECTIVELY DISSOLVING NICKEL AND/OR COPPER FROM METAL AND PLASTIC SUBSTRATES AND WHICH ARE ALKALINE SOLUTIONS COMPRISING: (A) A NITRO-SUBSTITUTED AROMATIC COMPOUND HAVING AT LEAST ONE -MO2 GROUP ATTACHED TO THE AROMATIC RING AND A WATER-SOLUBILIZING SUBSTITUENT ALSO ATTACHED TO THE AROMATIC RING; (B) ELEMENTAL SULFUR; (C) AN ALKALI PHOSPHATE; (D) AN ALKALI CHLORIDE; (E) AN ALKYLENE POLYAMINE; AND (F) A CORROSION ATTACK INHIBITOR.
Inventors
- 👤 F Brindisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:01
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/44; C23F1/10; C23F1/14; C23F1/32; C23F1/34; C23F1/40
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |