Carbon dioxide hardening

Carbon dioxide hardening · 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 codeC04B40/0231
Official title{Carbon dioxide hardening}
Display labelCarbon dioxide hardening
Total patents171

Filing trend

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

Filing activity over the last five years is stable.

Patents filed per year
YearPatents
20156
20165
20176
201818
201920
202022
202112
202216
202319
202427
202513
20267

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 C04B40/0231?
CPC C04B40/0231 is the Cooperative Patent Classification code for “Carbon dioxide hardening.”
How many patents are filed under CPC C04B40/0231 (Carbon dioxide hardening)?
Our database includes 171 publications tagged with this CPC code.
Is patent activity under CPC C04B40/0231 growing?
Publication counts under this code: 27 in 2024 vs 13 in 2025 (latest complete years).