Spiro-condensed systems

Spiro-condensed systems · 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 codeC07D491/20
Official titleSpiro-condensed systems
Display labelSpiro-condensed systems
Total patents454

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
201534
201637
201748
201846
201953
202052
202148
202231
202339
202427
202532
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 C07D491/20?
CPC C07D491/20 is the Cooperative Patent Classification code for “Spiro-condensed systems.”
How many patents are filed under CPC C07D491/20 (Spiro-condensed systems)?
Our database includes 454 publications tagged with this CPC code.
Is patent activity under CPC C07D491/20 growing?
Publication counts under this code: 27 in 2024 vs 32 in 2025 (latest complete years).