Rose-colored gold alloy compositions with reversible...

Details Rose-colored gold alloy compositions with reversible... Rose-colored gold alloy compositions with reversible...

2005-05-09

2008-08-19

Ip, Sikyin (Department: 1793)

Alloys or metallic compositions

Gold base

Silver containing

C148S430000

Reexamination Certificate

active

07413705

ABSTRACT:
Improved 14-karat rose-colored gold alloy compositions include: about 58.5% gold; about 9.0-12.0% silver; about 0.0-0.2% zinc; about 0.3-0.4% cobalt; about 0.0-0.02% iridium; and about 29.0-33.0% copper. Improved 18-karat rose-colored gold alloy compositions include: about 75.2% gold; about 7.0% silver; about 0.0-0.2% zinc; about 0.3-0.4% cobalt; about 0.0-0.02% iridium; and about 17.0-17.5% copper. The hardness of these compositions are capable of being selectively changed between their respective annealed-hardness and age-hardness values. The color of these compositions is between about 5-7 CieLab a* color units and between about 17-21 CieLab b* color units.

REFERENCES:
patent: 5384089 (1995-01-01), Diamond
patent: 6676776 (2004-01-01), Agarwal et al.
patent: 63-169344 (1988-07-01), None
patent: 63169344 (1988-07-01), None
patent: 63-259042 (1988-10-01), None
patent: 63259042 (1988-10-01), None
Is 24K gold pure? posted Nov. 16, 2001, Retrieved from the internet:<URL:http://www.sciam.com/print—version.cfm?articleID=0009644A-594D-1C72-9EB7809EC588F2D7.

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