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PCE
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DIFF Subgroup
C04B 35/48

based on zirconium or hafnium oxides, zirconates, or hafnates

Introduced: September 1968

Title

Titles differ between systems:

IPC: based on zirconium or hafnium oxides or zirconates or hafnates

CPC: based on zirconium or hafnium oxides, zirconates, or hafnates

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 > based on zirconium or hafnium oxides or zirconates or hafnates

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 > based on zirconium or hafnium oxides, zirconates, or hafnates

Of 5 combined children, 4 exist in both systems.

1 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

IPC defines codes here since 1980.

Child Classifications

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  • C04B 35/481 CPC only CPC only
  • C04B 35/482 Refractories from grain sized mixtures since 1995 IPC+CPC Available in IPC and CPC
  • C04B 35/484 Refractories by fusion casting since 1995 IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

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

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

Top Applicants (CPC)

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