CPC Main Group
D21C 5/00 Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C);
2 direct subcodes
Child Classifications
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- D21C 5/02 Working-up waste paper (mechanical part D21B1/08, D21B1/32)
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