based on oxide ceramics

Introduced: January 1995

Title

Titles differ between systems:

IPC: based on oxides

CPC: based on oxide ceramics

Full Title

Full titles differ between systems:

IPC:

Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products > based on oxides

CPC:

Shaped ceramic products characterised by their composition ; Ceramics compositions ( containing free metal bonded to carbides, diamond, oxides, borides, nitrides, silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides or sulfides other than as macroscopic reinforcing agents C22C); Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products > based on oxide ceramics

Of 17 combined children, 15 exist in both systems.

2 codes are CPC-only extensions.

5 shared codes have differing titles between IPC and CPC.

Child Classifications

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C04B 35/013 CPC only CPC only
C04B 35/016 CPC only CPC only
C04B 35/03 based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite since 1995 −1 IPC IPC+CPC Available in IPC and CPC
C04B 35/08 based on beryllium oxide IPC+CPC Available in IPC and CPC
C04B 35/10 based on aluminium oxide IPC+CPC Available in IPC and CPC
C04B 35/12 based on chromium oxide (C04B35/047 and C04B35/105 take precedence) IPC+CPC Available in IPC and CPC
C04B 35/14 based on silica IPC+CPC Available in IPC and CPC
C04B 35/16 based on silicates other than clay IPC+CPC Available in IPC and CPC
C04B 35/26 based on ferrites +8 CPC −4 IPC IPC+CPC Available in IPC and CPC
C04B 35/42 based on chromites (C04B35/047 and C04B35/105 take precedence) IPC+CPC Available in IPC and CPC
C04B 35/44 based on aluminates IPC+CPC Available in IPC and CPC
C04B 35/447 based on phosphates since 1995 IPC+CPC Available in IPC and CPC
C04B 35/45 based on copper oxide or solid solutions thereof with other oxides since 1995 +3 CPC IPC+CPC Available in IPC and CPC
C04B 35/453 based on zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates since 1995 IPC+CPC Available in IPC and CPC
C04B 35/46 based on titanium oxides or titanates (containing also zirconium or hafnium oxides, zirconates or hafnates C04B35/49) IPC+CPC Available in IPC and CPC
C04B 35/48 based on zirconium or hafnium oxides, zirconates, or hafnates +1 CPC IPC+CPC Available in IPC and CPC
C04B 35/495 based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates since 1995 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class C04,2013–2023, worldwide · Source: EPO PATSTAT

CHINESE ACADEMY OF SCIENCES 2,095
WUHAN UNIVERSITY OF TECHNOLOGY 1,205
NGK INSULATORS JP 1,133
HALLIBURTON ENERGY SERVICES GROUP US 1,049
SIKA TECHNOLOGY CH 1,041
GUILIN UNIVERSITY OF TECHNOLOGY 807
WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY 806
SOUTHEAST UNIVERSITY 801
CORNING US 777
UNITED STATES GYPSUM COMPANY US 739

Top Applicants (CPC)

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