CPC Main Group
C01B 17/00 Sulfur; Compounds thereof
13 direct subcodes
Child Classifications
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- C01B 17/02 Preparation of sulfur; Purification
- C01B 17/16 Hydrogen sulfides
- C01B 17/20 Methods for preparing sulfides or polysulfides, in general (ammonium sulfides or polysulfides C01C; sulfides or polysulfides of metals, other than alkali metals, magnesium, calcium, strontium and barium, see the relevant groups of subclasses C01F or C01G, according to the metal)
- C01B 17/22 Alkali metal sulfides or polysulfides
- C01B 17/42 Sulfides or polysulfides of magnesium, calcium, strontium, or barium
- C01B 17/45 Compounds containing sulfur and halogen, with or without oxygen
- C01B 17/46 Compounds containing sulfur, halogen, hydrogen, and oxygen
- C01B 17/48 Sulfur dioxide; Sulfurous acid
- C01B 17/62 Methods of preparing sulfites in general (particular individual sulfites, see the relevant groups of subclasses C01B - C01G, according to the cation)
- C01B 17/64 Thiosulfates; Dithionites; Polythionates
- C01B 17/69 Sulfur trioxide; Sulfuric acid
- C01B 17/96 Methods for the preparation of sulfates in general (particular individual sulfates, see the relevant groups of subclasses C01B - C01G, according to the cation)
- C01B 17/98 Other compounds containing sulfur and oxygen (persulfuric acids C01B15/06; persulfates C01B15/08)
Top Applicants
Top 10 applicants by patent filingsfor class C01, 2013–2023, worldwide · Source: EPO PATSTAT
- CHINESE ACADEMY OF SCIENCES 4,293
- LG CHEM KR 3,317
- BASF (BADISCHE ANILIN & SODA FABRIK) DE 2,219
- SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,154
- OMYA INTERNATIONAL CH 1,524
- PANASONIC INTELLECTUAL PROPERTY JP 1,362
- SAUDI ARABIAN OIL COMPANY SA 1,298
- SUMITOMO METAL MINING COMPANY JP 1,286
- CENTRAL SOUTH UNIVERSITY 1,243
- L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE FR 1,238