Process for the electrolytic reclamation of spent etching fluids
Abstract
Abstract THIS INVENTION IS DIRECTED TO THE METHOD AND APPARATUS FOR THE ELECTROLYTIC RECLAMATION OF SPENT COPPER ETCHING FLUIDS, AND ALSO TO OVERCOMING THE PROBLEM OF WASTE DISCHARGE STREAM POLLUTION OF AQUEOUS SOLUTIONS OF IRON AND CHROMIUM METAL, BY PASSING THE SPENT ETCHANT, AS THE CATHOLYTE, INTO THE CATHODE CHAMBER OF A TWO CHAMBER ELECTROLYTIC CELL HAVING AN ANION PERMSELECTIVE ION EXCHANGE MEMBRANE SEPARATING SAID CATHODE CHAMBER FROM THE ANODE CHAMBER. THE CHEMICALLY REDUCED SPENT ETCHANT OF A PREVIOUS BATCH COMPRISES THE ANOLYTE. WHEN A DIRECT ELECTRIC CURRENT IS PASSED THROUGH THE CELL, COPPER IS REDUCED AND DEPOSITED ON THE CATHODE, AND THE CHEMICALLY REDUCED SPENT ETCHING FLUID IS OXIDIZED IN THE ANODE CHAMBER TO COMPRISE THE RECLAIMED ETCHING FLUID FOR FURTHER USE. THIS INVENTION IS ALSO DIRECTED TO THE ELECTROLYTIC CELL AND THE SYSTEM OF CARRYING OUT THE INVENTION AS NOTED ABOVE.
Inventors
- 👤 C Tirrell
Bibliographic Details
Claims Analysis
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |