Nickel-free white gold alloy compositions with reversible...

Details Nickel-free white gold alloy compositions with reversible... Nickel-free white gold alloy compositions with reversible...

2006-11-14

2006-11-14

Ip, Sikyin (Department: 1742)

Metal treatment

Stock

Noble metal base

C420S508000

Reexamination Certificate

active

07135078

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.

REFERENCES:
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patent: 1584078 (2005-02-01), None
patent: 2638837 (1978-03-01), None
patent: 11236637 (1999-08-01), None
patent: 2005163160 (2005-06-01), None

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