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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

  1. VOITH PATENT DE 1,857
  2. STORA ENSO FI 1,552
  3. KEMIRA FI 1,173
  4. KIMBERLY-CLARK CORPORATION US 1,107
  5. VALMET TECHNOLOGIES FI 965
  6. VALMET SE 943
  7. P&G (PROCTER & GAMBLE COMPANY) US 941
  8. OMYA INTERNATIONAL CH 821
  9. UPM-KYMMENE CORPORATION FI 512
  10. SEIKO EPSON CORPORATION JP 501