DIFF Subgroup
D21H 25/18 of old paper as in books, documents, e.g. restoring
Introduced: January 1990
Title
Titles differ between systems:
IPC: of old paper as in books or documents, e.g. restoring
CPC: of old paper as in books, documents, e.g. restoring
Full Title
Full titles differ between systems:
IPC:
After-treatment of paper not provided for in groups > of old paper as in books or documents, e.g. restoring
CPC:
After-treatment of paper not provided for in groups D21H17/00 - D21H23/00 > of old paper as in books, documents, e.g. restoring
No child classifications to compare. This is a leaf node in both 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