Tarnish resistant gold colored alloy
US5409663A · kind A · utility
3Cited by
8References
12Claims
0Family size
Inventors
Key dates
| Filing date | May 3, 1994 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | May 3, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C30/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An indium-free, gold-colored, tarnish and corrosion-resistant alloy having no greater than 10% by weight gold and a color value, as measured according to the Cielab Color Measurement System, of approximately L=87.4, a=1.1, b=15.3. The alloy comprises 28-35% copper, 19.5-22.5% silver, 6-11% palladium, 22-32% zinc, 0.1-1% aluminum, and 0.5-3% platinum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.