Sterling silver alloy compositions of exceptional and reversible hardness, and enhanced tarnish resistance
US7198683B2 · kind B2 · utility
7Cited by
10References
16Claims
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Key dates
| Filing date | Aug 26, 2004 |
| Grant date | Apr 3, 2007 |
| Priority date | — |
| Expiry date | Jul 23, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.