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CPC Subgroup
C01C 1/24

Sulfates of ammonium (C01C1/14 takes precedence)

Full Title

Ammonia; Compounds thereof > Sulfates of ammonium (C01C1/14 takes precedence)

Filing statistics

CPC C01C 1/24 belongs to the parent subclass C01C, which recorded 10,840 patent applications worldwide between 2013 and 2023. Annual filings grew from 558 in 2013 to 1,445 in 2023 (+159%). The most active applicants in class C01 are CHINESE ACADEMY OF SCIENCES (4,293 applications), LG CHEM (3,317 applications) and BASF (BADISCHE ANILIN & SODA FABRIK) (2,219 applications).

Source: EPO PATSTAT, worldwide filings

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 1/248 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

  1. CHINESE ACADEMY OF SCIENCES 4,293
  2. LG CHEM KR 3,317
  3. BASF (BADISCHE ANILIN & SODA FABRIK) DE 2,219
  4. SINOPEC (CHINA PETROCHEMICAL CORPORATION) 2,154
  5. OMYA INTERNATIONAL CH 1,524
  6. PANASONIC INTELLECTUAL PROPERTY JP 1,362
  7. SAUDI ARABIAN OIL COMPANY SA 1,298
  8. SUMITOMO METAL MINING COMPANY JP 1,286
  9. CENTRAL SOUTH UNIVERSITY 1,243
  10. L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE FR 1,238