1. CPC Sections
  2. CPC Section D
  3. CPC Class D21
  4. CPC Subclass D21J
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Version: 2025.01
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CPC
COOPERATIVE PATENT CLASSIFICATION
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D21J
FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE (manufacture of articles by dry processes B27N) [2018-08]
WARNING

  • In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.
D21J 1/00
Fibreboard (preparation of pulp compositions or addition of chemical agents D21B, D21C, D21H; formation of the wet web D21F) [2013-01]
D21J 1/02
.
Cutting, e.g. using wet saws [2013-01]
D21J 1/04
.
Pressing [2013-01]
D21J 1/06
.
Drying [2013-01]
D21J 1/08
.
Impregnated or coated fibreboard [2013-01]
D21J 1/10
.
After-treatment [2013-01]
D21J 1/12
. .
Hardening [2013-01]
D21J 1/14
. .
Conditioning [2013-01]
D21J 1/16
.
Special fibreboard [2013-01]
D21J 1/165
. .
{Roofing material} [2013-01]
D21J 1/18
. .
Hardboard [2013-01]
D21J 1/20
. .
Insulating board [2013-01]
D21J 3/00
Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds [2018-01]
D21J 3/02
.
of rings [2013-01]
D21J 3/04
.
of tubes [2013-01]
D21J 3/06
.
of stoppers [2013-01]
D21J 3/08
.
of bobbins [2013-01]
D21J 3/10
.
of hollow bodies [2013-01]
D21J 3/12
.
of sheets; of diaphragms [2013-01]
D21J 5/00
Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds [2018-01]
D21J 7/00
Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould [2018-01]