After-treatment

After-treatment · 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 codeC23C18/1689
Official title{After-treatment}
Display labelAfter-treatment
Total patents226

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
201524
201633
201721
201819
201925
202024
202117
202220
202319
202414
20257
20263

Representative patents

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

Frequently asked questions

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

What is CPC C23C18/1689?
CPC C23C18/1689 is the Cooperative Patent Classification code for “After-treatment.”
How many patents are filed under CPC C23C18/1689 (After-treatment)?
Our database includes 226 publications tagged with this CPC code.
Is patent activity under CPC C23C18/1689 growing?
Publication counts under this code: 14 in 2024 vs 7 in 2025 (latest complete years).