C25F PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
Description
C25F encompasses electrochemical processes and equipment designed to selectively remove material layers or deposits from solid objects through electrolysis. This includes electropolishing, electrorefining, electrostripping of coatings, and electrolytic cleaning or descaling applications across metallic and non-metallic substrates. The classification covers both the procedural parameters (current control, electrolyte composition, electrode configuration) and the apparatus configuration required for material removal, distinguishing it from electrodeposition (C25D) which adds material rather than removing it.
Filing statistics
CPC subclass C25F recorded 6,983 patent applications worldwide between 2013 and 2023. Annual filings grew from 451 in 2013 to 629 in 2023 (+39%), peaking at 773 applications in 2020. 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
4 direct subcodes
Child Classifications
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- C25F 1/00 Electrolytic cleaning, degreasing, pickling or descaling
- C25F 3/00 Electrolytic etching or polishing
- C25F 5/00 Electrolytic stripping of metallic layers or coatings
- C25F 7/00 Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects (for both electrolytic coating and removal C25D); Servicing or operating
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