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PCE
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CPC Subgroup Additional Only
C04B 2237/586

by joining layers or articles of the same composition but having different densities

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 > Forming a gradient in composition or in properties across the laminate or the joined articles > by joining layers or articles of the same composition but having different densities

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