C25 ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
Description
Class C25 covers electrochemical processes that use electric current to drive chemical reactions, including electrolysis, electroplating, electrorefining, and electrophoretic deposition. It encompasses the industrial apparatus, cells, electrodes, and control systems required for these electrolytic operations, as well as related electrophoretic techniques for coating and material separation. Applications include metal extraction and purification, surface coating, electrowinning, anodizing, and electroforming. Adjacent classes such as C01 (inorganic chemistry) and H01M (electrochemistry cells) address related electrochemical topics but from different technical perspectives.
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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- C25B ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B) heading since 1974 IPC+CPC Available in IPC and CPC
- C25C PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR heading since 1974 IPC+CPC Available in IPC and CPC
- C25D PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR heading since 1974 −2 IPC IPC+CPC Available in IPC and CPC
- C25F PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR heading since 1974 IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
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)
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