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US3600244A
Expired / Lapsed
US
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Process of etching metal with recovery or regeneration and recycling
Assignee: International Business Machines Corp
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Filing: 1969-02-20
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Granted: 1971-08-17
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Expires: 1989-02-20
Abstract
Abstract THIS INVENTION REFERS TO A PROCESS WHEREBY THE REACTION PRODUCTS OF ETCHING COPPER, COBALT, IRON, NICKEL, ZINC, OR MAGNESIUM WITH CUPRIC CHLORIDE OR FERRIC CHLORIDE ARE PRECIPITATED AS A DOUBLE SALT OF THE DISSOLVED METAL CHLORIDE AND AMMONIUM CHLORIDE BY COOLING THE SOLUTION. THE DOUBLE SALT IS SEPARATED FROM THE REMAINING SOLUTION, THE ETCHING SOLUTION IS RECOVERED AND REGENERATED BY THE USE OF AN OXIDANT SUCH AS CHLORINE, MURIATIC ACID AND HYDROGEN PEROXIDE, MURIATIC ACID AND AIR, OR MURIATIC ACID AND OXYGEN.
Inventors
- 👤 Herbert Wegener
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:24
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/46
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |