Sterling silver alloy compositions of exceptional and...

Details Sterling silver alloy compositions of exceptional and... Sterling silver alloy compositions of exceptional and...

2007-04-03

2007-04-03

Ip, Sikyin (Department: 1742)

Metal treatment

Stock

Noble metal base

C148S430000, C420S502000, C420S504000

Reexamination Certificate

active

10926877

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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