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US 4,814,011 AGranted
Investments for dental casting
AssigneeG-C Dental Industrial Corp.
InventorsHiroshi Kamohara, Shohei Hayashi, Nobukazu Ohi
Life of this patent
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AssigneeG-C Dental Industrial Corp.
InventorsHiroshi Kamohara, Shohei Hayashi, Nobukazu Ohi
Estimating the term…
An investment for dental casting comprises a mixture of at least one refractory selected from alumina, zirconia, magnesia clinker, quartz, cristobalite and fused quartz with either a mixture of a soluble phosphate with magnesium oxide or hemi-hydrate gypsum, which act as a binder. The investment of the invention further contains 0.5 to 5 parts by weight of raw starch (original starch) and 0.1 to 50 parts by weight of at least one selected from the group consisting of carbides, nitrides, borides, silicides and sulfides of transition metals of Groups IV, V and VI in the periodic table, which are added as expanding agents to 100 parts by weight of the aforesaid mixture. The investment of the invention may still further contain 0.1 to 1 part by weight of soluble starch.
An investment for dental casting, in which 0.5 to 5 parts by weight of raw starch and 0.1 to 50 parts by weight of at least one compound selected from the group consisting of carbides, nitrides, borides, silicides and sulfides of transition metals of Groups IV, V and VI in the periodic table are added as expanding agents to 100 parts by weight of a mixture consisting essentially of at least one refractory selected from the group consisting of alumina, zirconia, magnesia clinker, quartz and cristobalite, with either a mixture of a soluble phosphate with magnesium oxide or hemi-hydrate gypsum, which act as a binder.
An investment for dental casting, in which 0.5 to 5 parts by weight of raw starch, 0.1 to 50 parts by weight of at least one compound selected from the group consisting of carbides, nitrides, borides, silicides and sulfides of transition metals of Groups IV, V and VI in the periodic table and 0.1 to 1 part by weight of soluble starch are added as expanding agents to 100 parts by weight of a mixture consisting essentially of at least one refractory selected from the group consisting of alumina, zirconia, magnesia clinker, quartz and cristobalite, with either a mixture of a soluble phosphate with magnesium oxide or hemi-hydrate gypsum, which act as a binder.
Dependencies are inferred from the claim text.