CPC Subgroup
C01C 1/24 Sulfates of ammonium (C01C1/14 takes precedence)
Full Title
Ammonia; Compounds thereof > Sulfates of ammonium (C01C1/14 takes precedence)
5 direct subcodes
Child Classifications
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- C01C 1/242 Preparation from ammonia and sulfuric acid or sulfur trioxide
- C01C 1/244 Preparation by double decomposition of ammonium salts with sulfates
- C01C 1/245 Preparation from compounds containing nitrogen and sulfur
- C01C 1/248 Preventing coalescing or controlling form or size of the crystals
- C01C 1/249 Deacidifying the crystals
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