IPC Subgroup
C01B 17/22 Alkali metal sulfides or polysulfides
Introduced: September 1968
Last revised: January 2006
Full Title
Sulfur; Compounds thereof > Alkali metal sulfides or polysulfides
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
Related Keywords
alkali metal SULFIDE(S)
7 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- C01B 17/24 Preparation by reduction
- C01B 17/3 Preparation from sodium or potassium amalgam with sulfur or sulfides
- C01B 17/32 Hydrosulfides of sodium or potassium
- C01B 17/34 Polysulfides of sodium or potassium
- C01B 17/36 Purification
- C01B 17/38 Dehydration
- C01B 17/4 Making shaped products, e.g. granules
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