WebCPC CPC COOPERATIVE PATENT CLASSIFICATION

D01C　CHEMICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES

D01C 1/00 Treatment of vegetable material

D01C 1/02 ・By chemical methods to obtain bast fibres

D01C 1/04 ・Bacteriological retting

D01C 3/00 Treatment of animal material, e.g. chemical scouring of wool (recovery of lanolin or wool wax C11B 11/00)

D01C 3/02 ・De-gumming silk

D01C 5/00 Carbonising rags, {threads or fabrics} to recover animal fibres, {i.e. chemical removal of vegetable impurities (treatment of threads or fabrics of animal fibres for other purposes than removal of vegetable impurities D06L or D06M)}