14-karat gold alloy compositions having enhanced yellow color, reversible hardness, and fine grain structure

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United States of America Patent

PATENT NO 6676776
SERIAL NO

10223971

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Abstract

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A 14-karat gold alloy composition having a desirable yellow color and with reversible hardness contains about 58.65 weight percent gold, about 11.5-25.0 weight percent silver, about 11.85-23.35 weight percent copper, and about 2-7 weight percent zinc. The color of the composition has a value of between about -3.0 to about 0.5 CieLab a* color units, and has a value of between about +20.0 to about 22.0 CieLab b* color units. The alloy has a hardness ratio between about 0.4-2.0, and color ratio of less than about 1.0.

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Patent Owner(s)

Patent OwnerAddress
HALLMARK SWEET INC49 PEARL STREET ATTLEBORO MA 02703

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Agarwal, Dwarika P Attleboro, MA 16 116
Raykhtsaum, Grigory Sharon, MA 18 55

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