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CPC Main Group
C04B 9/00

Magnesium cements or similar cements

5 direct subcodes

Child Classifications

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  • C04B 9/02 Magnesium cements containing chlorides, e.g. Sorel cement
  • C04B 9/04 Magnesium cements containing sulfates, nitrates, phosphates or fluorides
  • C04B 9/06 Cements containing metal compounds other than magnesium compounds, e.g. compounds of zinc or lead
  • C04B 9/20 Manufacture, e.g. preparing the batches (preheating, burning, calcining or cooling lime stone, magnesite or dolomite C04B2/10)

Top Applicants

Top 10 applicants by patent filingsfor class C04, 2013–2023, worldwide · Source: EPO PATSTAT

  1. HALLIBURTON ENERGY SERVICES GROUP US 2,158
  2. CHINESE ACADEMY OF SCIENCES 1,569
  3. NGK INSULATORS JP 1,504
  4. SIKA TECHNOLOGY CH 1,181
  5. CORNING US 974
  6. WUHAN UNIVERSITY OF TECHNOLOGY 926
  7. UNITED STATES GYPSUM COMPANY US 882
  8. GE (GENERAL ELECTRIC COMPANY) US 828
  9. MITSUBISHI MATERIALS CORPORATION JP 792
  10. SAUDI ARABIAN OIL COMPANY SA 686