CPC Subgroup
C01F 7/74 Sulfates
Full Title
Compounds of aluminium > Aluminium compounds containing sulfur > Sulfates
5 direct subcodes
Child Classifications
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- C01F 7/741 Preparation from elemental aluminium or elemental aluminium containing materials, e.g. foil or dross
- C01F 7/743 Preparation from silicoaluminious materials, e.g. clays or bauxite
- C01F 7/745 Preparation from alums, e.g. alunite
- C01F 7/746 After-treatment, e.g. dehydration or stabilisation
- C01F 7/76 Double salts, i.e. compounds containing, besides aluminium and sulfate ions, only other cations, e.g. alums
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