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DIFF Subgroup
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

Introduced: January 1990

Title

Titles differ between systems:

IPC: forming new compounds , e.g. within the pulp or paper, by chemical reaction with itself, or other added substances

CPC: 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

Full Title

Full titles differ between systems:

IPC:

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 > forming new compounds , e.g. within the pulp or paper, by chemical reaction with itself, or other added substances

CPC:

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 > 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

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

IPC defines codes here since 1990.

Child Classifications

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  • D21H 17/19 by reactions only involving carbon-to-carbon unsaturated bonds since 1990 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class D21,2013–2023, worldwide · Source: EPO PATSTAT

  1. VOITH PATENT DE 1,809
  2. STORA ENSO FI 1,467
  3. KEMIRA FI 1,086
  4. KIMBERLY-CLARK CORPORATION US 935
  5. VALMET TECHNOLOGIES FI 924
  6. VALMET SE 904
  7. P&G (PROCTER & GAMBLE COMPANY) US 862
  8. OJI HOLDINGS CORPORATION 696
  9. OMYA INTERNATIONAL CH 584
  10. SOUTH CHINA UNIVERSITY OF TECHNOLOGY 571

Top Applicants (CPC)

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