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IPC Subgroup
C23D 5/04

by dry methods

Introduced: September 1968

Last revised: January 2006

Full Title

Coating with enamels or vitreous layers > by dry methods

Classification Context

Section:
CHEMISTRY; METALLURGY
Class:
COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
Subclass:
ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS

Filing statistics

IPC C23D 5/04 belongs to the parent subclass C23D, which recorded 1,508 patent applications worldwide between 2013 and 2023. Annual filings grew from 86 in 2013 to 127 in 2023 (+48%), peaking at 200 applications in 2019. The most active applicants in class C23 are APPLIED MATERIALS (8,096 applications), TOKYO ELECTRON (3,985 applications) and CHINESE ACADEMY OF SCIENCES (2,842 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 8,096
  2. TOKYO ELECTRON JP 3,985
  3. CHINESE ACADEMY OF SCIENCES 2,842
  4. LAM RESEARCH CORPORATION US 2,654
  5. TOKYO ELECTRON 2,540
  6. NIPPON STEEL CORPORATION JP 2,465
  7. JFE STEEL JP 2,368
  8. ASM IP HOLDING NL 2,092
  9. APPLIED MATERIALS 1,877
  10. POSCO (POHANG IRON AND STEEL COMPANY) KR 1,782