Counter-rotating devices

Counter-rotating devices · Cooperative Patent Classification (CPC)

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

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeB65B51/306
Official title{Counter-rotating devices}
Display labelCounter-rotating devices
Total patents119

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
20158
201615
20178
201813
201920
20209
202111
20229
202310
20248
20258

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 B65B51/306?
CPC B65B51/306 is the Cooperative Patent Classification code for “Counter-rotating devices.”
How many patents are filed under CPC B65B51/306 (Counter-rotating devices)?
Our database includes 119 publications tagged with this CPC code.
Is patent activity under CPC B65B51/306 growing?
Publication counts under this code: 8 in 2024 vs 8 in 2025 (latest complete years).