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CPC Subgroup
C23C 22/60

using alkaline aqueous solutions with pH greater than 8

Full Title

Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals > using aqueous solutions > using alkaline aqueous solutions with pH greater than 8

4 direct subcodes

Child Classifications

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  • C23C 22/62 Treatment of iron or alloys based thereon
  • C23C 22/63 Treatment of copper or alloys based thereon
  • C23C 22/64 Treatment of refractory metals or alloys based thereon

Top Applicants

Top 10 applicants by patent filingsfor class C23, 2013–2023, worldwide · Source: EPO PATSTAT

  1. APPLIED MATERIALS US 10,596
  2. TOKYO ELECTRON JP 5,229
  3. LAM RESEARCH CORPORATION US 3,622
  4. NIPPON STEEL CORPORATION JP 3,171
  5. JFE STEEL JP 3,128
  6. ASM IP HOLDING NL 2,722
  7. ARCELORMITTAL LU 2,481
  8. TOKYO ELECTRON 2,359
  9. APPLIED MATERIALS 2,284
  10. CHINESE ACADEMY OF SCIENCES 2,110