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CPC Subgroup
C23C 8/80

After-treatment

Full Title

Solid state diffusion of only non-metal elements into metallic material surfaces (diffusion of silicon C23C10/00); Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals (C23C14/00 takes precedence) > After-treatment

Filing statistics

CPC C23C 8/80 belongs to the parent subclass C23C, which recorded 264,425 patent applications worldwide between 2013 and 2023. Annual filings grew from 19,173 in 2013 to 23,243 in 2023 (+21%), peaking at 27,713 applications in 2020. The most active applicants in class C23 are APPLIED MATERIALS (10,596 applications), TOKYO ELECTRON (5,229 applications) and LAM RESEARCH CORPORATION (3,622 applications).

Source: EPO PATSTAT, worldwide filings

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