CPC Main Group
C04B 28/00 Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
Filing statistics
CPC C04B 28/00 belongs to the parent subclass C04B, which recorded 228,252 patent applications worldwide between 2013 and 2023. Annual filings grew from 10,861 in 2013 to 20,066 in 2023 (+85%), peaking at 27,356 applications in 2018. The most active applicants in class C04 are HALLIBURTON ENERGY SERVICES GROUP (2,158 applications), CHINESE ACADEMY OF SCIENCES (1,569 applications) and NGK INSULATORS (1,504 applications).
Source: EPO PATSTAT, worldwide filings
12 direct subcodes
Child Classifications
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- C04B 28/02 containing hydraulic cements other than calcium sulfates
- C04B 28/14 containing calcium sulfate cements
- C04B 28/18 containing mixtures of the silica-lime type
- C04B 28/24 containing alkyl, ammonium or metal silicates; containing silica sols
- C04B 28/28 containing organic polyacids, e.g. polycarboxylate cements
- C04B 28/30 containing magnesium cements (magnesium oxide cements C04B28/10)
- C04B 28/34 containing cold phosphate binders
- C04B 28/36 containing sulfur, sulfides or selenium
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