Patent classifications
A
HUMAN NECESSITIES
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A23
FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
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A23L
FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES, NOT OTHERWISE PROVIDED FOR; PREPARATION OR TREATMENT THEREOF
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3/00
Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
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A23L3/36
Freezing; Subsequent thawing; Cooling
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A23L3/37
with addition of; or treatment with; chemicals
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A23L3/375
with direct contact between the food and the chemical, e.g. liquid nitrogen, at cryogenic temperature
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