DIFF Main Group
D21C 5/00 Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C);
Introduced: September 1968
Title
Titles differ between systems:
IPC: Other processes for obtaining cellulose, e.g. cooking cotton linters
CPC: Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C);
Full Title
Full titles differ between systems:
IPC:
Other processes for obtaining cellulose, e.g. cooking cotton linters
CPC:
Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C);
Of 2 combined children, 1 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- D21C 5/02 Working-up waste paper (mechanical part D21B1/08, D21B1/32) +2 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class D21,2013–2023, worldwide · Source: EPO PATSTAT
- VOITH PATENT DE 1,809
- STORA ENSO FI 1,467
- KEMIRA FI 1,086
- KIMBERLY-CLARK CORPORATION US 935
- VALMET TECHNOLOGIES FI 924
- VALMET SE 904
- P&G (PROCTER & GAMBLE COMPANY) US 862
- OJI HOLDINGS CORPORATION 696
- OMYA INTERNATIONAL CH 584
- SOUTH CHINA UNIVERSITY OF TECHNOLOGY 571
Top Applicants (CPC)
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