US3914160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bath for the electrodeposition of birght tin-cobalt alloy
Assignee: Sony Corp
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Filing: 1973-05-15
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Granted: 1975-10-21
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Expires: 1993-05-15
Abstract
Abstract A bright electroplated tin-cobalt alloy is obtained with an aqueous pyrophosphate electroplating bath which contains a brightening agent selected from the group which consists of amino carboxylic acid with sulphur, neutral amino acid, basic amino acid, peptone, protein, organo-sulphur compound, ammonia, ammonium salt, amine, and mixtures thereof.
Inventors
- 👤 Shimetomo Fueki
- 👤 Junichi Tada
- 👤 Kenji Osawa
- 👤 Naomi Sakai
- 👤 Kazuhiro Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:57
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/60
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A BRIGHT TIN-COBALT ALLOY ELECTROPLATING BATH CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF: A. A STANNOUS SALT PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 2 TO 70 GRAMS OF STANNOUS METAL PER LITER OF SAID SOLUTION, B. A COBALT SALT PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 1 TO 40 GRAMS OF COBALT METAL PER LITER OF SAID SOLUTION, WITH THE TOTAL AMOUNT OF SAID STANNOUS AND COBALT METALS BEING LESS THAN 75 GRAMS PER LITER OF SAID SOLUTION, C. AN ALKALI METAL PYROPHOSPHATE PRESENT IN AN AMOUNT PROVIDING MORE THAN 2 MOLTS THEREOF FOR EACH MOL OF SAID TOTAL AMOUNT OF SAID STANNOUS AND COBALT METALS, AND D. AT LEAST BRIGHTENER ADDITIVE SELECTED FROM THE GROUP CONSISTING OF AMINO CARBOXYLIC ACIDS WITH SULPHUR AND WHICH IS PRESENT IN SAID SOLUTION IN AN AMOUNT OF FROM 0.01 TO 5 GRAMS PER LITER OF SAID SOLUTION.
Claim 2
Dependent Claim
147 words
A BRIGHT TIN-COBALT ALLOY ELECTROPLATING BATH CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF: A. A STANNOUS SALT PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 2 TO 70 GRAMS OF STANNOUS METAL PER LITER OF SAID SOLUTION, B. A COBALT SALT PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE FROM 1 TO 40 GRAMS OF COBALT METAL PER LITER OF SAID SOLUTION, WITH THE TOTAL AMOUNT OF SAID STANNOUS AND COBALT METALS BEING LESS THAN 75 GRAMS PER LITER OF SAID SOLUTION, C. AN ALKALI METAL PYROPHOSPHATE PRESENT IN AN AMOUNT PROVIDING MORE THAN 2 MOLTS THEREOF FOR EACH MOL OF SAID TOTAL AMOUNT OF SAID STANNOUS AND COBALT METALS, AND D. AT LEAST BRIGHTENER ADDITIVE SELECTED FROM THE GROUP CONSISTING OF AMINO CARBOXYLIC ACIDS WITH SULPHUR AND WHICH IS PRESENT IN SAID SOLUTION IN AN AMOUNT OF FROM 0.01 TO 5 GRAMS PER LITER OF SAID SOLUTION.
Claim 3
Dependent Claim
19 words
A bright tin-cobalt alloy electroplating bath according to claim 1; in which said stannous salt is tin (II) pyrophosphate.
Claim 4
Dependent Claim
52 words
A bright tin-cobalt alloy electroplating bath according to claim 1; in which said cobalt salt is selected from the group consisting of cobalt sulfate, cobalt nitrate, cobalt chloride, cobalt bromide, cobalt carbonate, cobalt acetate, ethylene-diamine tetraacetic acid cobalt, cobalt (II) acetyl acetonate, cobalt (III) acetyl acetonate, glycine cobalt (III) and cobalt pyrophosphate.
Claim 5
Dependent Claim
19 words
A bright tin-cobalt alloy electroplating bath according to claim 1; in which said alkali metal pyrophosphate is potassium pyrophosphate.
Claim 6
Dependent Claim
17 words
A bright tin-cobalt alloy electroplating bath according to claim 1; in which said brightener additive is cystine.
Claim 7
Dependent Claim
32 words
A bright tin-cobalt alloy electroplating bath according to claim 1; in which said amino carboxylic acids with sulfur are the group consisting of cystine, methionine, cysteine, homocystine, homocysteine, ethionine and cystine disulfoxide.
Claim 8
Dependent Claim
17 words
A bright tin-cobalt alloy electroplating bath according to claim 1; in which said brightener additive is cysteine.
Claim 9
Dependent Claim
37 words
A bright tin-cobalt alloy electroplating bath according to claim 1; in which said stannOus salt is tin pyrophosphate, said cobalt salt is cobalt sulfate, said alkali metal pyrophosphate is potassium pyrophosphate, and said brightener additive is methionine.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |