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IPC Subclass
D21J

FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MÂCHÉ

Introduced: September 1968

Classification Context

Section:
TEXTILES; PAPER
Class:
PAPER-MAKING; PRODUCTION OF CELLULOSE
Subclass:
FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MÂCHÉ

Description

D21J covers the production of fibreboard and manufactured articles formed from cellulosic fibrous suspensions, including papier-mâché. This classification encompasses manufacturing processes such as wet-laying, pressing, drying, and bonding of cellulose fibers to create composite board materials or molded products. It includes technologies for controlling fiber distribution, density, and mechanical properties of the resulting boards and articles. Related processes in paper-making chemistry and pulp preparation are classified elsewhere in D21, while finished paper products themselves fall under different classifications.

Filing statistics

IPC subclass D21J recorded 5,696 patent applications worldwide between 2013 and 2023. Annual filings grew from 244 in 2013 to 801 in 2023 (+228%). The most active applicants in class D21 are VOITH PATENT (1,809 applications), STORA ENSO (1,467 applications) and KEMIRA (1,086 applications).

Source: EPO PATSTAT, worldwide filings

Related Keywords

COMPO-BOARDmaking paper CUPSconstruction or finishing of FIBREBOARDmanufacture of articles from wood FIBRES by wet processesMOULDING(S) articles from papier-mâchè or wet fibre pulpmoulding articles from PAPIER MÂCHÉPARTICLE BOARDartificial WOODchipboardmoulding articles from WOOD particles or fibres

4 direct subcodes

Child Classifications

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  • 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
  • D21J 7/00 Manufacture of hollow articles from fibre suspensions or papier-mâché by deposition of fibres in or on a wire-net mould

Top Applicants

Top 10 applicants by patent filingsfor class D21, 2013–2023, worldwide · Source: EPO PATSTAT

  1. VOITH PATENT DE 1,809
  2. STORA ENSO FI 1,467
  3. KEMIRA FI 1,086
  4. KIMBERLY-CLARK CORPORATION US 935
  5. VALMET TECHNOLOGIES FI 924
  6. VALMET SE 904
  7. P&G (PROCTER & GAMBLE COMPANY) US 862
  8. OJI HOLDINGS CORPORATION 696
  9. OMYA INTERNATIONAL CH 584
  10. SOUTH CHINA UNIVERSITY OF TECHNOLOGY 571