CPC Subgroup
C01B 33/146 After-treatment of sols (; preparation of hydroorganosols, organosols or dispersions in an organic medium from hydrosols C01B33/145)
Full Title
Silicon; Compounds thereof ( C01B21/00, C01B23/00 take precedence; persilicates C01B15/14; carbides C01B32/956) > Silicon oxides; Hydrates thereof > Silica; Hydrates thereof, e.g. lepidoic silicic acid > Colloidal silica, e.g. dispersions, gels, sols > After-treatment of sols (; preparation of hydroorganosols, organosols or dispersions in an organic medium from hydrosols C01B33/145)
4 direct subcodes
Child Classifications
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- C01B 33/148 Concentration; Drying; Dehydration; Stabilisation; Purification
- C01B 33/149 Coating
- C01B 33/151 by progressively adding a sol to a different sol, i.e. "build-up" of particles using a "heel"
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