Patent US3973954A successfully refreshed from Google Patents.
Patent US3857765A successfully refreshed from Google Patents.
US3857765A
Expired / Lapsed
US
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Purification of nickel and cobalt electroplating solutions
Assignee: Metalux Corp
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Filing: 1973-09-20
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Granted: 1974-12-31
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Expires: 1993-09-20
Abstract
Abstract Zinc, copper and/or iron impurities ordinarily associated with nickel or cobalt electroplating baths can be removed from solution by introducing an amount of a predetermined and selected mercaptobenzothiazole compound into the electroplating bath sufficient to convert the zinc, copper and/or iron impurities into relatively insoluble metal salts. The insoluble salts may then be removed from the bath by passing the treated solution through a standard filtering system.
Inventors
- 👤 R Merker
- 👤 S Lucca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:04
CPC Classifications
C; C25; C25D; C25D21/00; C25D21/16; C25D21/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
IN THE PROCESS WHEREIN A METAL SELECTED FROM NICKEL AND COBALT IS ELECTRODEPOSITED FROM AN AQUEOUS ACIDIC SOLUTION CONTAINING IONS THEREOF, WHEREIN SAID SOLUTION IS AT LEAST PERIODICALLY FED THROUGH A FILTRATION CHAMBER TO REMOVE IMPURITIES THEREFROM, AND WHEREIN, DURING USE, METALLIC IMPURITIES SELECTED FROM THE GROUP CONSISTING OF ZINC, COPPER AND IRON BUILD UP IN SOLUTION; THE IMPROVEMENT IN SAID PROCESS WHEREIN THERE IS ADDED TO THE SOLUTION IN AMOUNTS SUFFICIENT TO PRECIPITATE THE METALLIC IMPURITIES, WHEREBY THE METALLIC IMPURITIES ARE FILTERED OUT OF SAID SOLUTION, AN ORGANIC COMPOUND HAVING THE GENERAL FORMULA A-S-X, WHEREIN A REPRESENTS THE RADICAL
Claim 2
Dependent Claim
100 words
IN THE PROCESS WHEREIN A METAL SELECTED FROM NICKEL AND COBALT IS ELECTRODEPOSITED FROM AN AQUEOUS ACIDIC SOLUTION CONTAINING IONS THEREOF, WHEREIN SAID SOLUTION IS AT LEAST PERIODICALLY FED THROUGH A FILTRATION CHAMBER TO REMOVE IMPURITIES THEREFROM, AND WHEREIN, DURING USE, METALLIC IMPURITIES SELECTED FROM THE GROUP CONSISTING OF ZINC, COPPER AND IRON BUILD UP IN SOLUTION; THE IMPROVEMENT IN SAID PROCESS WHEREIN THERE IS ADDED TO THE SOLUTION IN AMOUNTS SUFFICIENT TO PRECIPITATE THE METALLIC IMPURITIES, WHEREBY THE METALLIC IMPURITIES ARE FILTERED OUT OF SAID SOLUTION, AN ORGANIC COMPOUND HAVING THE GENERAL FORMULA A-S-X, WHEREIN A REPRESENTS THE RADICAL
Claim 3
Dependent Claim
45 words
The improvement in the process according to claim 1, wherein the metal electrodeposited from the aqueous acidic solution is nickel and the additive to precipitate the metallic impurities is selected from the group consisting of 2-mercapto-benzothiazole, sodium 2-mercapto-benzothiazole, benzothiazyl-monosulfide, benzothiazyl-disulfide, nickel 2-mercapto-benzothiazole and cobalt 2-mercapto-benzothiazole.
Claim 4
Dependent Claim
29 words
The improvement in the process according to claim 2, wherein the additive is cobalt 2-mercapto-benzothiazole in an amount of about 1 gram of additive per gallon of bath solution.
References Cited (Backward Citations)
US3518171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |