Method of manufacturing fine-grained copper substrate for optical information carrier
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United States of America Patent
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Jun 16, 1987
Grant Date -
N/A
app pub date -
Sep 2, 1986
filing date -
Sep 2, 1986
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Expired
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Abstract
A method is provided for depositing on a substrate a layer of fine-grained copper especially adapted for the making of masters for optical information storage discs, comprising the steps of placing a substrate in an electroplating bath comprising from about 180 to about 220 grams/liter of copper sulfate, from about 40 to about 80 grams/liter of sulfuric acid, from about 30 to about 60 ppm of chloride ion, from about 1.0 to about 15 grams/liter of a polyether having a molecular weight from about 4,000 to about 10,000, from about 1.0 to about 100 milligrams/liter of a sulfonated, sulfurized benzene compound, and from about 3.5 to about 30 milligrams/liter of 1-lower alkyl-2-mercapto imidazole; and passing electric current through the bath to deposit copper on the substrate. Also disclosed is a method of using high performance liquid chromatography techniques to quantitatively measure 1-lower alkyl-2-mercapto imidazole concentration and to control the same.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
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Patent Owner(s)
- SONY MUSIC ENTERTAINMENT INC.
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Nee, Hanphire H | Stamford, CT | 2 | 24 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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