IPC Main Group
C04B 7/00 Hydraulic cements
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- Subclass:
- LIME; MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
Related Keywords
HYDRAULIC(S) cements
9 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
- 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
- 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
- CHINESE ACADEMY OF SCIENCES 2,095
- WUHAN UNIVERSITY OF TECHNOLOGY 1,205
- NGK INSULATORS JP 1,133
- HALLIBURTON ENERGY SERVICES GROUP US 1,049
- SIKA TECHNOLOGY CH 1,041
- GUILIN UNIVERSITY OF TECHNOLOGY 807
- WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY 806
- SOUTHEAST UNIVERSITY 801
- CORNING US 777
- UNITED STATES GYPSUM COMPANY US 739