Nickel-free white gold alloy compositions with reversible hardness characteristics
US7135078B1 · kind B1 · utility
1Cited by
1References
7Claims
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Key dates
| Filing date | Dec 5, 2005 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | Dec 5, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/14
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A nickel-free white gold alloy composition having selectively reversible hardness characteristics between its annealed- and aged-hardness values, consists essentially of: about 55–60% gold; about 6.0–10.0% palladium; about 5.0–12.0% copper; about 0.1–2.0% zinc; and about 20–30% silver. A 14-karat nickel-free white gold alloy composition, consists essentially of: about 58.5% gold; about 25.0–27.15% silver; about 6.0% palladium; about 5.0–12.0% copper; about 0–2.0% zinc; about 0–0.2% cobalt; about 0–0.005% iridium; and about 0–0.01% lithium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.