CPC Main Group
C04B 7/00 Hydraulic cements (calcium sulfate cements C04B11/00)
11 direct subcodes
Child Classifications
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- C04B 7/02 Portland cement
- C04B 7/12 Natural pozzuolanas; Natural pozzuolana cements;
- C04B 7/14 Cements containing slag (slags from waste incineration C04B7/28)
- C04B 7/22 Iron ore cements
- C04B 7/24 Cements from oil shales, residues or waste other than slag
- C04B 7/32 Aluminous cements
- C04B 7/34 Hydraulic lime cements; Roman cements
- C04B 7/345 Hydraulic cements not provided for in one of the groups C04B7/02 - C04B7/34
- C04B 7/36 Manufacture of hydraulic cements in general
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