Top IPC subclasses
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1
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F24J
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11
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Production or use of heat not otherwise provided for
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2
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F24H
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4
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fluid heaters, e.g. water or air heaters, having heat-generating means, in general
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3
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F26B
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2
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Drying solid materials or objects by removing liquid therefrom
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4
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A23B
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2
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preserving, e.g. by canning, meat, fish, eggs, fruit, vegetables, edible seedschemical ripening of f
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5
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F28D
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2
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heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media do n
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6
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F25D
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1
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refrigeratorscold roomsice-boxescooling or freezing apparatus not covered by any other subclass
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7
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A23N
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1
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machines or apparatus for treating harvested fruit, vegetables, or flower bulbs in bulk, not otherwi
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8
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A23L
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1
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Foods, foodstuffs, or non-alcoholic beverages, not covered by subclasses A21D or A23B-A23J; their preparation or treatment, e.g. cooking, modification of nutritive qualities, physical treatment; preservation of foods or foodstuffs, in general
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