Sterling silver alloy compositions of exceptional and reversible hardness, and enhanced tarnish resistance
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United States of America Patent
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Apr 3, 2007
Grant Date -
Mar 2, 2006
app pub date -
Aug 26, 2004
filing date -
Aug 26, 2004
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Abstract
A sterling silver alloy composition of exceptional and reversible hardness and enhanced tarnish resistance, consists essentially of the following parts by weight: at least about 92.5% silver; about 4.4% to about 5.25% copper; about 0% to about 1.0% zinc; about 0.85% tin; about 0.05% to about 0.3% lithium; about 0.05% to about 0.5% silicon; about 0% to about 1.2% germanium; and about 0% to about 0.02% boron.
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