What is CPC C11B9/003?

CPC C11B9/003 is the Cooperative Patent Classification code for “the ring containing less than six carbon atoms.”

How many patents are filed under CPC C11B9/003 (the ring containing less than six carbon atoms)?

Our database includes 174 publications tagged with this CPC code.

Publication counts under this code: 9 in 2024 vs 8 in 2025 (latest complete years).

the ring containing less than six carbon atoms · Cooperative Patent Classification (CPC)

Chemical and metallurgical processes, compounds, and materials.

Mapped technology topics for this CPC code.

CPC classification statistics
Metric	Value
CPC code	C11B9/003
Official title	{the ring containing less than six carbon atoms}
Display label	the ring containing less than six carbon atoms
Total patents	174

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

Filing activity over the last five years is declining.

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

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

What is CPC C11B9/003?: CPC C11B9/003 is the Cooperative Patent Classification code for “the ring containing less than six carbon atoms.”
How many patents are filed under CPC C11B9/003 (the ring containing less than six carbon atoms)?: Our database includes 174 publications tagged with this CPC code.
Is patent activity under CPC C11B9/003 growing?: Publication counts under this code: 9 in 2024 vs 8 in 2025 (latest complete years).