CPC Main Group
C04B 11/00 Calcium sulfate cements
8 direct subcodes
Child Classifications
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- C04B 11/02 dehydrating gypsum
- C04B 11/05 obtaining anhydrite, (C04B11/028 takes precedence)
- C04B 11/06 starting from anhydrite
- C04B 11/26 ; starting from phosphogypsum or from waste, e.g. purification products of smoke (C04B11/02 takes precedence; chemical purification of smoke, fumes or exhaust gases B01D53/00 )
- C04B 11/28 Mixtures thereof with other inorganic cementitious materials (C04B7/04, C04B7/153 take precedence)
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