C25F PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
Introduced: July 1974
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.
Additional Content IPC
Limiting references
Treatment of water, waste water or sewage by electrochemical means, e.g. electrolysis Inhibiting corrosion of metals by anodic or cathodic protection Constructional parts, or assemblies thereof, of cells for both electrolytic coating and electrolytic removal
Application references
Electrolytic etching of semiconductor wafers or parts of semiconductor or solid-state devices
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1974.
Child Classifications
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- C25F 1/00 Electrolytic cleaning, degreasing, pickling or descaling since 1974 IPC+CPC Available in IPC and CPC
- C25F 5/00 Electrolytic stripping of metallic layers or coatings since 1974 IPC+CPC Available in IPC and CPC
- 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 since 1974 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class C25,2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 1,797
- EBARA CORPORATION JP 729
- CENTRAL SOUTH UNIVERSITY 650
- INDUSTRIE DE NORA IT 641
- ROBERT BOSCH DE 600
- JFE STEEL JP 593
- KMUST (KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY) 553
- SIEMENS DE 536
- CEA (COMMISSARIAT A L'ENERGIE ATOMIQUE) FR 525
- JX NIPPON MINING & METALS CORPORATION 499
Top Applicants (CPC)
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