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IPC Class
C23

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

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

Description

C23 encompasses processes and methods for modifying metal surfaces through coating, chemical treatment, and vapor deposition techniques. The class covers application of metallic or non-metallic coatings to metal substrates, chemical surface treatments (including passivation and conversion coatings), diffusion treatments altering surface composition, and vacuum-based deposition methods such as evaporation, sputtering, ion implantation, and chemical vapor deposition. It also includes technologies for preventing corrosion, oxidation, and incrustation of metallic materials. Related surface engineering processes such as electroplating and case hardening are typically classified in other sections of metallurgy or organic chemistry.

Filing statistics

IPC C23 recorded 344,095 patent applications worldwide between 2013 and 2023, summed across its 4 subclasses. Annual filings grew from 24,993 in 2013 to 34,707 in 2023 (+39%), peaking at 36,686 applications in 2020. 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

Related Keywords

metallurgical CHEMISTRYSTOVING enamels

4 direct subcodes

Child Classifications

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Top Applicants

Top 10 applicants by patent filings, 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