What is CPC B23B31/302?

CPC B23B31/302 is the Cooperative Patent Classification code for “Hydraulic equipment, e.g. pistons, valves, rotary joints.”

How many patents are filed under CPC B23B31/302 (Hydraulic equipment, e.g. pistons, valves, rotary joints)?

Our database includes 43 publications tagged with this CPC code.

Publication counts under this code: 8 in 2024 vs 7 in 2025 (latest complete years).

Hydraulic equipment, e.g. pistons, valves, rotary joints · Cooperative Patent Classification (CPC)

Separating, mixing, shaping, printing, and transporting materials.

Mapped technology topics for this CPC code.

CPC classification statistics
Metric	Value
CPC code	B23B31/302
Official title	{Hydraulic equipment, e.g. pistons, valves, rotary joints}
Display label	Hydraulic equipment, e.g. pistons, valves, rotary joints
Total patents	43

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

Filing activity over the last five years is growing.

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 B23B31/302?: CPC B23B31/302 is the Cooperative Patent Classification code for “Hydraulic equipment, e.g. pistons, valves, rotary joints.”
How many patents are filed under CPC B23B31/302 (Hydraulic equipment, e.g. pistons, valves, rotary joints)?: Our database includes 43 publications tagged with this CPC code.
Is patent activity under CPC B23B31/302 growing?: Publication counts under this code: 8 in 2024 vs 7 in 2025 (latest complete years).