Abstract: A humidifier is provided for a closed defrosting cabinet for containing frozen food to be defrosted in a compartment thereof. A fan for circulating air is disposed in the defrosting cabinet. The defrosting chamber is humidified with humidified air circulated by the fan. The defrosting chamber is partitioned into a plurality of areas by a slidable partition wall consisting of at least two sections. The defrosting cabinet can maintain the temperature and the humidity constant, defrost the food rapidly, and prevent the surface of the food from drying and changing in color.

Abstract: An apparatus for making frozen confections including a double-walled vessel consisting of a concentric cylindrical inner and outer vessels each having an upper open end and defining an annular space therebetween for containing a cooling material. The said double-walled vessel is secured in a larger vessel, the bottom of which is supplied with driving means. A carrying means is rotatably mounted on said driving means and the double-walled vessel is mounted thereon and is rotated thereby. Said receptacle and said double-walled vessel is closed by a cover, the underside of which carries fixed paddles. When the cover is in place, the paddles extend into the inner vessel and remains stationary as the double-walled vessel is rotated.

Abstract: A coolant, comprising an aqueous solution of potassium hydrogencarbonate, a polyhydric alcohol and, where desired, 1.0 to 20.0% by weight of saccharides, which may be additionally incorporated, for the purpose of protection against corrosion, with 0.01 to 0.5% by weight of at least one compound selected from the group consisting of alkali metal salts of silicic acid, alkali metal salts of metasilicic acid and alkali metal salts of polyphosphoric acid.The coolant has an eutectic melting point as low as -8.5.degree. C. or below and is less corrosive to metal containers. In addition, the potassium hydrogencarbonate in the coolant is quite stable, so that the bubbling phenomenon of the coolant could be prevented.

Abstract: An apparatus for making frozen confections including a double-walled vessel consisting of a concentric cylindrical inner and outer vessels each having an upper open end and defining an annular space therebetween for containing a cooling material. The said double-walled vessel is secured in a larger vessel, the bottom of which is supplied with driving means. A carrying means is rotatably mounted on said driving means and the double-walled vessel is mounted thereon and is rotated thereby. Said receptacle and said double-walled vessel is closed by a cover, the underside of which carries fixed paddles. When the cover is in place, the paddles extend into the inner vessel and remains stationary as the double-walled vessel is rotated.