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

D21J

FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE (manufacture of articles by dry processes B27N)

D21J 1/00

Fibreboard (preparation of pulp compositions or addition of chemical agents D21B, D21C, D21H; formation of the wet web D21F)

D21J 1/02

Cutting, e.g. using wet saws

D21J 1/04

Pressing

D21J 1/06

Drying

D21J 1/08

Impregnated or coated fibreboard

D21J 1/10

After-treatment

D21J 1/12

. .

Hardening

D21J 1/14

. .

Conditioning

D21J 1/16

Special fibreboard

D21J 1/165

. .

{

Roofing material

}

D21J 1/18

. .

Hardboard

D21J 1/20

. .

Insulating board

D21J 3/00

Manufacture of articles by pressing wet fibre pulp, or papier-mâchè, between moulds

D21J 3/02

of rings

D21J 3/04

of tubes

D21J 3/06

of stoppers

D21J 3/08

of bobbins

D21J 3/10

of hollow bodies

D21J 3/12

of sheets; of diaphragms

D21J 5/00

Manufacture of hollow articles by transferring sheets, produced from fibre suspensions or papier-mâchè by suction on wire-net moulds, to couch-moulds

D21J 7/00

Manufacture of hollow articles from fibre suspensions or papier-mâchè by deposition of fibres in or on a wire-net mould