Iwatani Sangyo Kabushiki Kaisha

Iwatani Sangyo Kabushiki Kaisha (Iwatani International Corporation)

Yoshimasa Kidowaki

Akira Kuwano

Shiro Okamoto

In a mold material for use in molding a titanium cast to be mounted into the mouth as a dental prosthesis, magnesia and phosphate are added as a binder to its main ingredient composed of alumina and zirconia.

Nonsilica mold material for dental titanium cast

An arc generating electric system includes a first high-tension d.c. supply, electrodes and a high-voltage rectifier, the electrodes and the rectifier being connected in series, wherein the rectifier is in a forward position with respect to the first d.c. supply, and the arc generating system additionally includes a second high-tension d.c. supply connected in parallel to the rectifier, the second d.c. supply being in a forward position with respect to the first high-tension d.c. supply.

Arc generating electric system for a metal casting apparatus

A casting furnace includes upper and lower chambers, separated by a wall having a pouring path extending therethrough. A crucible is positioned in the upper chamber and a mold is positioned in the lower chamber, both in alignment with the pouring path. A body of casting metal is placed in the crucible and is melted from the top down by an electric arc generated in the upper chamber, the bottom portion of the body of casting metal blocking the pouring path until the casting metal has become molten. Thereafter, the molten casting metal falls by gravity through the pouring path, and into the mold. The arrangement is such that the molten metal requires nothing but the force of gravity to enter the mold cavity.

Growing community of inventors

Osaka, Japan

Yoshimasa Kidowaki