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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A23L3/34
by treatment with chemicals
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A23L3/3409
in the form of gases, e.g. fumigation; Compositions or apparatus therefor
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A23L3/3418
in a controlled atmosphere, e.g. partial vacuum, comprising only CO2, N2, O2 or H2O
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A23L3/3427
in which an absorbent is placed or used
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