US4140596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the electrolytic refining of copper
Assignee: Montanwerke Brixlegg GmbH
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Filing: 1977-07-22
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Granted: 1979-02-20
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Expires: 1997-07-22
Abstract
Abstract A process for the electrolytic refining of metals, especially copper, in which the copper is deposited from an electrolyte on the cathode of an electrolytic cell which comprises periodically reversing the current with a forward pulse time of 2 to 9 seconds and a reverse pulse time of 0.1 to 0.45 seconds.
Inventors
- 👤 Hans Wobking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:39
CPC Classifications
C; C25; C25C; C25C1/00; C25C1/12; Y; Y10; Y10S; Y10S204/00; Y10S204/09
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
In a process for the electrolytic deposition of copper at a cathode from an electrolytic bath at an effective temperature by passing an electric current and a suitable current density through said bath between an anode and a cathode, the improvement wherein: the current flow is periodically reversed and has a forward pulse time of 2 to 9 seconds and a reverse pulse time of 0.1 to 0.45 seconds; the ratio of the metal-deposition current to the reverse current is between 10:1 and 1:1; the anode has the following composition:
Claim 2
Dependent Claim
90 words
In a process for the electrolytic deposition of copper at a cathode from an electrolytic bath at an effective temperature by passing an electric current and a suitable current density through said bath between an anode and a cathode, the improvement wherein: the current flow is periodically reversed and has a forward pulse time of 2 to 9 seconds and a reverse pulse time of 0.1 to 0.45 seconds; the ratio of the metal-deposition current to the reverse current is between 10:1 and 1:1; the anode has the following composition:
Claim 3
Dependent Claim
59 words
5 to 99.0% by weight copper 0.35 to 0.40% by weight nickel about 0.20% by weight arsenic about 0.15% by weight lead, and about 0.04% by weight antimony; and the bath is aqueous and consists essentially of: 40 to 48 g/l copper 150 to 200 g/l sulfuric acid 2 to 10 g/l arsenic; and 15 to 25 g/l nickel.
Claim 4
Dependent Claim
59 words
5 to 99.0% by weight copper 0.35 to 0.40% by weight nickel about 0.20% by weight arsenic about 0.15% by weight lead, and about 0.04% by weight antimony; and the bath is aqueous and consists essentially of: 40 to 48 g/l copper 150 to 200 g/l sulfuric acid 2 to 10 g/l arsenic; and 15 to 25 g/l nickel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |