United States Patent and Trademark Office

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Color		Curly Brackets (indicating CPC extensions to IPC)

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	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

NOTE

Attention is drawn to the note following the title of Class D01

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)

}