CPC Subgroup
D21H 11/16 modified by a particular after-treatment
Full Title
Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only > modified by a particular after-treatment
2 direct subcodes
Child Classifications
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- D21H 11/18 Highly hydrated, swollen or fibrillatable fibres
- D21H 11/20 Chemically or biochemically modified fibres
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