IPC Subgroup
C25B 1/04 by electrolysis of water
Introduced: July 1974
Last revised: January 2021
Full Title
Electrolytic production of inorganic compounds or non-metals > Products > Hydrogen or oxygen > by electrolysis of water
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- Subclass:
- ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON- METALS; APPARATUS THEREFOR
Related Keywords
ELECTROLYSIS of waterelectrolysis of WATER
2 direct subcodes
Child Classifications
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- C25B 1/042 by electrolysis of steam
- C25B 1/044 producing mixed hydrogen and oxygen gas, e.g. Brown's gas [HHO]
Top Applicants
Top 10 applicants by patent filingsfor 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