CPC Main Group
D21C 11/00 Regeneration of pulp liquors
13 direct subcodes
Child Classifications
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- D21C 11/02 of sulfite lye
- D21C 11/04 of alkali lye
- D21C 11/06 Treatment of pulp gases; Recovery of the heat content of the gases;
- D21C 11/10 Concentrating spent liquor by evaporation (evaporators B01D)
- D21C 11/12 Combustion of pulp liquors
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