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PCE
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DIFF Subgroup
D21H 23/34

Knife or blade type coaters

Introduced: January 1990

Full Title

Full titles differ between systems:

IPC:

Processes or apparatus for adding material to the pulp or to the paper > characterised by the manner in which substances are added > Addition to the formed paper > by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper > Knife or blade type coaters

CPC:

Processes or apparatus for adding material to the pulp or to the paper (applying liquids or other fluent material to surfaces, in general B05; processes for making continuous lengths of paper D21F11/00) > characterised by the manner in which substances are added > Addition to the formed paper > by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper (D21H23/66 takes precedence; removing excess material D21H25/08) > Knife or blade type coaters

IPC and CPC are identically structured here. All 2 subcodes exist in both systems.

IPC defines codes here since 1990.

Child Classifications

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  • D21H 23/36 Knife or blade forming part of the fluid reservoir, e.g. puddle-type trailing blade since 1990 IPC+CPC Available in IPC and CPC
  • D21H 23/38 the fluid material being applied with a special device, e.g. with a roll in a flooded-nip inverted blade coater 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