CPC Subgroup
D21H 17/05 containing elements other than carbon and hydrogen only
Full Title
Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution > Non-macromolecular organic compounds > containing elements other than carbon and hydrogen only
10 direct subcodes
Child Classifications
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- D21H 17/06 Alcohols; Phenols; Ethers; Aldehydes; Ketones; Acetals; Ketals
- D21H 17/07 Nitrogen-containing compounds
- D21H 17/09 Sulfur-containing compounds
- D21H 17/10 Phosphorus-containing compounds
- D21H 17/11 Halides
- D21H 17/12 Organo-metallic compounds
- D21H 17/13 Silicon-containing compounds
- D21H 17/14 Carboxylic acids; Derivatives thereof
- D21H 17/17 Ketenes, e.g. ketene dimers
- D21H 17/18 forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with itself, or other added substances, e.g. by grafting on the 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