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CPC Subgroup Additional Only
C04B 2235/80

Phases present in the sintered or melt-cast ceramic products other than the main phase

Full Title

Aspects relating to ceramic starting mixtures or sintered ceramic products > Aspects relating to sintered or melt-casted ceramic products > Phases present in the sintered or melt-cast ceramic products other than the main phase

4 direct subcodes

Child Classifications

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  • C04B 2235/81 Materials characterised by the absence of phases other than the main phase, i.e. single phase materials
  • C04B 2235/83 Ferrites containing Fe2+
  • C04B 2235/85 Intergranular or grain boundary phases
  • C04B 2235/87 Grain boundary phases intentionally being absent

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