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IPC Subgroup
C01B 3/06

by reaction of inorganic compounds containing electro-positively bound hydrogen with inorganic reducing agents

Introduced: January 1980

Last revised: January 2026

Full Title

Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen; Reversible storage of hydrogen > Production of hydrogen; Production of gaseous mixtures containing hydrogen > by reaction of inorganic compounds containing electro-positively bound hydrogen with inorganic reducing agents

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
INORGANIC CHEMISTRY
Subclass:
NON-METALLIC ELEMENTS; COMPOUNDS THEREOF

6 direct subcodes

Child Classifications

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  • C01B 3/061 by reaction of water with metal oxides
  • C01B 3/065 by reaction of inorganic compounds with hydrides
  • C01B 3/103 the hydrogen being generated from the water as a result of cycles of reactions, e.g. sulfur-iodine cycle
  • C01B 3/2 by reaction of metal hydroxides with carbon monoxide

Top Applicants

Top 10 applicants by patent filingsfor class C01, 2013–2023, worldwide · Source: EPO PATSTAT

  1. CHINESE ACADEMY OF SCIENCES 5,794
  2. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 3,286
  3. LG CHEM KR 2,689
  4. BASF (BADISCHE ANILIN & SODA FABRIK) DE 1,669
  5. CENTRAL SOUTH UNIVERSITY 1,531
  6. KMUST (KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY) 1,252
  7. SUMITOMO METAL MINING COMPANY JP 1,073
  8. ZHEJIANG UNIVERSITY 1,061
  9. PANASONIC INTELLECTUAL PROPERTY JP 1,058
  10. PANASONIC INTELLECTUAL PROPERTY 1,038