CPC Main Group
D21H 17/00 Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
10 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- D21H 17/01 Waste products, e.g. sludge
- D21H 17/02 Material of vegetable origin (proteins D21H17/22; lignins D21H17/23; polysaccharides D21H17/24; rosin D21H17/62)
- D21H 17/03 Non-macromolecular organic compounds
- D21H 17/20 Macromolecular organic compounds
- D21H 17/60 Waxes
- D21H 17/61 Bitumen
- D21H 17/62 Rosin; Derivatives thereof
- D21H 17/63 Inorganic compounds
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