having more than two oxygen atoms in the ring

having more than two oxygen atoms in the ring · 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 codeC08K5/159
Official titlehaving more than two oxygen atoms in the ring
Display labelhaving more than two oxygen atoms in the ring
Total patents33

Filing trend

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

Filing activity over the last five years is rapidly declining.

Patents filed per year
YearPatents
20154
20172
20182
20193
20205
20215
20224
20234
20242
20251
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 C08K5/159?
CPC C08K5/159 is the Cooperative Patent Classification code for “having more than two oxygen atoms in the ring.”
How many patents are filed under CPC C08K5/159 (having more than two oxygen atoms in the ring)?
Our database includes 33 publications tagged with this CPC code.
Is patent activity under CPC C08K5/159 growing?
Publication counts under this code: 2 in 2024 vs 1 in 2025 (latest complete years).