CPC Main Group
D21F 11/00 Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
10 direct subcodes
Child Classifications
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- D21F 11/02 of the Fourdrinier type
- D21F 11/06 of the cylinder type
- D21F 11/10 Making imitation mould-made paper
- D21F 11/12 Making corrugated paper or board
- D21F 11/14 Making cellulose wadding, filter or blotting paper
- D21F 11/16 Making paper strips for spinning or twisting
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