CPC Subgroup Additional Only
C04B 2235/72 Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
Full Title
Aspects relating to ceramic starting mixtures or sintered ceramic products > Aspects relating to sintered or melt-casted ceramic products > Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
8 direct subcodes
Child Classifications
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- C04B 2235/721 Carbon content
- C04B 2235/722 Nitrogen content
- C04B 2235/723 Oxygen content
- C04B 2235/724 Halogenide content
- C04B 2235/725 Metal content
- C04B 2235/726 Sulfur content
- C04B 2235/727 Phosphorus or phosphorus compound content
- C04B 2235/728 Silicon content
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