After-treatment

After-treatment · Cooperative Patent Classification (CPC)

Electric circuits, power, telecommunications, and semiconductors.

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeH01B13/228
Official title{After-treatment}
Display labelAfter-treatment
Total patents47

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
20151
20161
20174
20182
20192
20209
20215
20226
20238
20244
20254
20261

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 H01B13/228?
CPC H01B13/228 is the Cooperative Patent Classification code for “After-treatment.”
How many patents are filed under CPC H01B13/228 (After-treatment)?
Our database includes 47 publications tagged with this CPC code.
Is patent activity under CPC H01B13/228 growing?
Publication counts under this code: 4 in 2024 vs 4 in 2025 (latest complete years).