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US 4,783,975 AGranted
Colored pearl
AssigneeCatalysts & Chemicals Industries Co., Ltd.
InventorsMichio Komatsu, Kiyohide Mimura
Life of this patent
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Abstract
A cultured colored pearl comprises a concretion of layers of pearl around the invading material which is a molded article composed predominantly of powders of waste pearls, shells, waste coral and/or shells of Crustacea.
Claims9
A process for producing a colored pearl comprising the steps of:
- (1) forming a mixture of 20-100 wt.% of at least one member selected from the group consisting of pearl powder, shell powder, coral powder and shell powder of Crustacea and having a particle diameter in the range of 0.1-105 microns, 0-80 wt.% of calcium carbonate and 0-20 wt.% of an inorganic pigment, said weight percents being based on the weight of the mixture;
- (2) subjecting the mixture to compression molding at a temperature of 400.degree.-1500.degree. C. to form a molded article having a particle diameter of 20 mm or smaller,
- (3) utilizing said molded article as a nucleus by inserting it in a mollusk with shells;
- and
- (4) culturing said mollusk to produce a colored pearl.
2 more elements
Dependencies are inferred from the claim text.