CPC Main Group
C23F 11/00 Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent (adding inhibitors to mineral oil, fuels, or lubricants C10; adding inhibitors to pickling solutions C23G)
Filing statistics
CPC C23F 11/00 belongs to the parent subclass C23F, which recorded 28,255 patent applications worldwide between 2013 and 2023. Annual filings grew from 1,945 in 2013 to 2,068 in 2023 (+6%), peaking at 3,133 applications in 2018. 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
4 direct subcodes
Child Classifications
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- C23F 11/02 in air or gases by adding vapour phase inhibitors
- C23F 11/04 in markedly acid liquids
- C23F 11/06 in markedly alkaline liquids
- C23F 11/08 in other liquids
Top Applicants
Top 10 applicants by patent filingsfor class C23, 2013–2023, worldwide · Source: EPO PATSTAT
- APPLIED MATERIALS US 10,596
- TOKYO ELECTRON JP 5,229
- LAM RESEARCH CORPORATION US 3,622
- NIPPON STEEL CORPORATION JP 3,171
- JFE STEEL JP 3,128
- ASM IP HOLDING NL 2,722
- ARCELORMITTAL LU 2,481
- TOKYO ELECTRON 2,359
- APPLIED MATERIALS 2,284
- CHINESE ACADEMY OF SCIENCES 2,110