Chemistry & Metallurgy

Chemistry & Metallurgy · Cooperative Patent Classification (CPC)

Chemical and metallurgical processes, compounds, and materials.

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeC23C28/044
Official title
Display labelChemistry & Metallurgy (mapped technology topic)
Total patents1,172

Filing trend

Year-over-year patent counts classified under this CPC code.

Filing activity over the last five years is declining.

Patents filed per year
YearPatents
201569
201671
201795
2018117
201995
2020138
2021142
2022152
202371
2024122
202585
202615

Representative patents

Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.

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Frequently asked questions

Answers are generated from the same data shown on this page.

What is CPC C23C28/044?
CPC C23C28/044 is the Cooperative Patent Classification code for “Chemistry & Metallurgy.”
How many patents are filed under CPC C23C28/044 (Chemistry & Metallurgy)?
Our database includes 1,172 publications tagged with this CPC code.
Is patent activity under CPC C23C28/044 growing?
Publication counts under this code: 122 in 2024 vs 85 in 2025 (latest complete years).