CPC Subgroup
D21H 13/12 from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Full Title
Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material (chemical features in the manufacture of artificial fibres D01F) > Organic non-cellulose fibres > from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
3 direct subcodes
Child Classifications
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- D21H 13/14 Polyalkenes, e.g. polystyrene
- D21H 13/16 Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
- D21H 13/18 Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylonitriles
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