CPC Subgroup Additional Only
C04B 2235/30 Constituents and secondary phases not being of a fibrous nature
Full Title
Aspects relating to ceramic starting mixtures or sintered ceramic products > Composition of constituents of the starting material or of secondary phases of the final product > Constituents and secondary phases not being of a fibrous nature
9 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- C04B 2235/32 Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B 2235/34 Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B 2235/36 Glass starting materials for making ceramics, e.g. silica glass
- C04B 2235/38 Non-oxide ceramic constituents or additives
- C04B 2235/40 Metallic constituents or additives not added as binding phase
- C04B 2235/42 Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B 2235/44 Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B 2235/46 Gases other than oxygen used as reactant, e.g. nitrogen used to make a nitride phase
- C04B 2235/48 Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
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