CPC Main Group
D21H 11/00 Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
Filing statistics
CPC D21H 11/00 belongs to the parent subclass D21H, which recorded 50,846 patent applications worldwide between 2013 and 2023. Annual filings declined from 3,964 in 2013 to 3,670 in 2023 (-7%), peaking at 5,497 applications in 2018. The most active applicants in class D21 are VOITH PATENT (1,857 applications), STORA ENSO (1,552 applications) and KEMIRA (1,173 applications).
Source: EPO PATSTAT, worldwide filings
6 direct subcodes
Child Classifications
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- D21H 11/02 Chemical or chemomechanical pulp
- D21H 11/08 Mechanical or thermomechanical pulp
- D21H 11/10 Mixtures of chemical and mechanical pulp
- D21H 11/12 Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
- D21H 11/14 Secondary fibres (working-up waste paper D21C5/02)
- D21H 11/16 modified by a particular after-treatment
Top Applicants
Top 10 applicants by patent filingsfor class D21, 2013–2023, worldwide · Source: EPO PATSTAT
- VOITH PATENT DE 1,857
- STORA ENSO FI 1,552
- KEMIRA FI 1,173
- KIMBERLY-CLARK CORPORATION US 1,107
- VALMET TECHNOLOGIES FI 965
- VALMET SE 943
- P&G (PROCTER & GAMBLE COMPANY) US 941
- OMYA INTERNATIONAL CH 821
- UPM-KYMMENE CORPORATION FI 512
- SEIKO EPSON CORPORATION JP 501