Tarnish and sweat resistant low karat gold alloys

US11401581B1 · kind B1 · utility

Assignee

• LEACHGARNER, INC. · US

Inventors

• William Guenley · Albuquerque, US
• Mossig H. Makhoulian · New York, US
• Joe Esposito · Dix Hills, US
• Luke Autry · Attleboro, US
• Scott Suvall · Hartford, US

Key dates

• Filing date: Jan 7, 2020
• Grant date: Aug 2, 2022
• Expiry date: Aug 7, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22F1/08
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

This invention provides low karat, low silver, 6 kt gold-copper-zinc alloys with acceptable workability that can be processed into wire, tube, sheet stock, or cast. The alloys are annealed at 1200° F., rapidly cooled, and heat treated at about 6000 to 800° F., which increases the hardness and durability in finished parts made from these alloys. The alloys include grain refiners. The alloys are resistant to oxidation from sweat and tarnishing. Additional fabrication operations can form jewelry items such as balls, chain, hoops and studs.