What is CPC F16F9/346?

CPC F16F9/346 is the Cooperative Patent Classification code for “Throttling passages in the form of slots arranged in cylinder walls.”

How many patents are filed under CPC F16F9/346 (Throttling passages in the form of slots arranged in cylinder walls)?

Our database includes 124 publications tagged with this CPC code.

Publication counts under this code: 11 in 2024 vs 15 in 2025 (latest complete years).

Throttling passages in the form of slots arranged in cylinder walls · 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	F16F9/346
Official title	Throttling passages in the form of slots arranged in cylinder walls
Display label	Throttling passages in the form of slots arranged in cylinder walls
Total patents	124

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

Filing activity over the last five years is stable.

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 F16F9/346?: CPC F16F9/346 is the Cooperative Patent Classification code for “Throttling passages in the form of slots arranged in cylinder walls.”
How many patents are filed under CPC F16F9/346 (Throttling passages in the form of slots arranged in cylinder walls)?: Our database includes 124 publications tagged with this CPC code.
Is patent activity under CPC F16F9/346 growing?: Publication counts under this code: 11 in 2024 vs 15 in 2025 (latest complete years).