IPC Subgroup
C01B 17/02 Preparation of sulfur; Purification
Introduced: September 1968
Last revised: January 2006
Full Title
Sulfur; Compounds thereof > Preparation of sulfur; Purification
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
5 direct subcodes
Child Classifications
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- C01B 17/027 Recovery of sulfur from material containing elemental sulfur, e.g. luxmasses; Purification
- C01B 17/04 from gaseous sulfur compounds including gaseous sulfides
- C01B 17/06 from non-gaseous sulfides or materials containing such sulfides, e.g. ores
- C01B 17/1 Finely-divided sulfur, e.g. sublimed sulfur, flowers of sulfur
- C01B 17/12 Insoluble sulfur (mu-sulfur)
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