IPC Main Group
C01B 3/00 Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen; Reversible storage of hydrogen
Introduced: January 1980
Last revised: January 2026
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
Related Keywords
AMMONIA synthesis gasHYDROGENgas mixture containing HYDROGENSYNTHESIS gasWATER gas
5 direct subcodes
Child Classifications
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- C01B 3/0005 Reversible storage of hydrogen, e.g. by hydrogen getters or electrodes
- C01B 3/0089 Ortho-para conversion
- C01B 3/0094 Atomic hydrogen
- C01B 3/02 Production of hydrogen; Production of gaseous mixtures containing hydrogen
- C01B 3/5 Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
Top Applicants
Top 10 applicants by patent filingsfor class C01, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 5,794
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,286
- LG CHEM KR 2,689
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 1,669
- CENTRAL SOUTH UNIVERSITY 1,531
- KMUST (KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY) 1,252
- SUMITOMO METAL MINING COMPANY JP 1,073
- ZHEJIANG UNIVERSITY 1,061
- PANASONIC INTELLECTUAL PROPERTY JP 1,058
- PANASONIC INTELLECTUAL PROPERTY 1,038