What is CPC F01C9/002?

CPC F01C9/002 is the Cooperative Patent Classification code for “the piston oscillating around a fixed axis.”

How many patents are filed under CPC F01C9/002 (the piston oscillating around a fixed axis)?

Our database includes 26 publications tagged with this CPC code.

Publication counts under this code: 1 in 2023 vs 1 in 2025 (latest complete years).

the piston oscillating around a fixed axis · Cooperative Patent Classification (CPC)

Engines, pumps, lighting, heating, and mechanical systems.

Mapped technology topics for this CPC code.

CPC classification statistics
Metric	Value
CPC code	F01C9/002
Official title	{the piston oscillating around a fixed axis}
Display label	the piston oscillating around a fixed axis
Total patents	26

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 F01C9/002?: CPC F01C9/002 is the Cooperative Patent Classification code for “the piston oscillating around a fixed axis.”
How many patents are filed under CPC F01C9/002 (the piston oscillating around a fixed axis)?: Our database includes 26 publications tagged with this CPC code.
Is patent activity under CPC F01C9/002 growing?: Publication counts under this code: 1 in 2023 vs 1 in 2025 (latest complete years).