imparting twist by a fluid, e.g. air vortex

imparting twist by a fluid, e.g. air vortex · Cooperative Patent Classification (CPC)

Textile and paper production, treatment, and products.

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeD01H4/02
Official titleimparting twist by a fluid, e.g. air vortex
Display labelimparting twist by a fluid, e.g. air vortex
Total patents36

Filing trend

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

Filing activity over the last five years is rapidly declining.

Patents filed per year
YearPatents
20155
20164
20176
20195
20203
20214
20234
20244
20251

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 D01H4/02?
CPC D01H4/02 is the Cooperative Patent Classification code for “imparting twist by a fluid, e.g. air vortex.”
How many patents are filed under CPC D01H4/02 (imparting twist by a fluid, e.g. air vortex)?
Our database includes 36 publications tagged with this CPC code.
Is patent activity under CPC D01H4/02 growing?
Publication counts under this code: 4 in 2024 vs 1 in 2025 (latest complete years).