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US Patent 7648775 Ceramic substrate, ceramic package for housing light emitting element

Patent 7648775 was granted and assigned to NGK SPARK PLUG CO on January, 2010 by the United States Patent and Trademark Office.

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Patent abstract

A ceramic substrate comprising a metallic layer on its surface, wherein said metallic layer includes: a silver layer containing silver; a gold layer containing gold; and a nickel layer containing nickel, in this order from an outermost layer of said metallic layer.

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