CPC Subgroup
C25D 21/16 Regeneration of process solutions
Full Title
Processes for servicing or operating cells for electrolytic coating > Regeneration of process solutions
Filing statistics
CPC C25D 21/16 belongs to the parent subclass C25D, which recorded 66,035 patent applications worldwide between 2013 and 2023. Annual filings grew from 4,313 in 2013 to 5,873 in 2023 (+36%), peaking at 7,202 applications in 2018. The most active applicants in class C25 are CHINESE ACADEMY OF SCIENCES (1,393 applications), JFE STEEL (914 applications) and EBARA CORPORATION (738 applications).
Source: EPO PATSTAT, worldwide filings
3 direct subcodes
Child Classifications
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- C25D 21/18 of electrolytes (C25D21/22 takes precedence)
- C25D 21/20 of rinse-solutions (C25D21/22 takes precedence)
- C25D 21/22 by ion-exchange
Top Applicants
Top 10 applicants by patent filingsfor class C25, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 1,393
- JFE STEEL JP 914
- EBARA CORPORATION JP 738
- INDUSTRIE DE NORA IT 674
- JX NIPPON MINING & METALS CORPORATION JP 652
- NIPPON STEEL CORPORATION JP 633
- CEA (COMMISSARIAT A L'ENERGIE ATOMIQUE) FR 630
- ROBERT BOSCH DE 626
- SIEMENS DE 587
- ATOTECH DEUTSCHLAND DE 561