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CPC Subgroup Additional Only
C04B 2237/55

Pre-treatments of a coated or not coated substrate other than oxidation treatment in order to form an active joining layer

Full Title

Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating > Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating > Pre-treatments of a coated or not coated substrate other than oxidation treatment in order to form an active joining layer

1 direct subcode

Child Classifications

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  • C04B 2237/555 on a substrate not containing an interlayer coating, leading to the formation of an interlayer coating

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