Nickel-free white gold alloy with reversible hardness characteristics
US5919320A · kind A · utility
7Cited by
9References
20Claims
0Family size
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Key dates
| Filing date | Nov 17, 1997 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Nov 17, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C5/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A hardenable white gold alloy consists essentially of about 55-60 % gold, about 12-20% silver, about 8-15% copper, about 8-18% palladium, about 0.0-1.0% tin, zinc indium or cobalt, and, optionally, about 0.005-0.02% iridium and/or ruthenium, and also about 0.01-0.03 weight percent lithium. The alloy is nickel-free, but has a pleasing white color similar to that of nickel-containing white gold alloys. The alloy has a fine grain structure, a lower hardness in its annealed condition, but is capable of being hardened to an exceptional hardness value. The hardening procedure is reversible.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.