Gold colored metal alloy
US5019335A · kind A · utility
Inventor
Key dates
| Filing date | Jul 10, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Jul 10, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C9/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides an improved casting alloy for use in costume jewelry and jewelry samples. In accordance with the present invention, a gold colored metal alloy is disclosed which is tarnish resistant and consists of the following ingredients such as, 75 to 85% copper, 5 to 15% nickel, 0 to 12% indium, and 0 to 12% zinc. It is also desirable to add approximately 0.01% iron and/or 0.05% silicon to act as a grain refiner and fluidity enhancer respectively. The alloy in accordance with the subject invention is a rich gold color which approximates a fourteen carat alloy. In addition, tarnish resistance and workability is greatly increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.