PatentsDB

by influencing boundary layers {(by bleeding elastic fluid F04D27/0215)}

by influencing boundary layers {(by bleeding elastic fluid F04D27/0215)} · Cooperative Patent Classification (CPC)

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

Related technology areas

Mapped technology topics for this CPC code.

CPC classification statistics
MetricValue
CPC codeF04D29/68
Official titleby influencing boundary layers {(by bleeding elastic fluid F04D27/0215)}
Display labelby influencing boundary layers {(by bleeding elastic fluid F04D27/0215)}
Total patents37

Filing trend

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

Filing activity over the last five years is stable.

Patents filed per year
YearPatents
20151
20162
20173
20184
20193
20203
20214
20224
20232
20247
20254

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 F04D29/68?
CPC F04D29/68 is the Cooperative Patent Classification code for “by influencing boundary layers {(by bleeding elastic fluid F04D27/0215)}.”
How many patents are filed under CPC F04D29/68 (by influencing boundary layers {(by bleeding elastic fluid F04D27/0215)})?
Our database includes 37 publications tagged with this CPC code.
Is patent activity under CPC F04D29/68 growing?
Publication counts under this code: 7 in 2024 vs 4 in 2025 (latest complete years).