CPC Main Group
C04B 33/00 Clay-wares (monolithic refractories or refractory mortars C04B35/66; porous products C04B38/00)
7 direct subcodes
Child Classifications
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- C04B 33/02 Preparing or treating the raw materials individually or as batches
- C04B 33/22 Grog products
- C04B 33/24 Manufacture of porcelain or white ware
- C04B 33/28 Slip casting (mechanical features B28B1/26)
- C04B 33/30 Drying methods
- C04B 33/32 Burning methods
- C04B 33/36 Reinforced clay-wares
Top Applicants
Top 10 applicants by patent filingsfor class C04, 2013–2023, worldwide · Source: EPO PATSTAT
- HALLIBURTON ENERGY SERVICES GROUP US 2,158
- CHINESE ACADEMY OF SCIENCES 1,569
- NGK INSULATORS JP 1,504
- SIKA TECHNOLOGY CH 1,181
- CORNING US 974
- WUHAN UNIVERSITY OF TECHNOLOGY 926
- UNITED STATES GYPSUM COMPANY US 882
- GE (GENERAL ELECTRIC COMPANY) US 828
- MITSUBISHI MATERIALS CORPORATION JP 792
- SAUDI ARABIAN OIL COMPANY SA 686