Axial flow fan
US-11105337-B2 · Aug 31, 2021 · US
Skewed blades
Skewed blades · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F04D29/386 |
| Official title | {Skewed blades} |
| Display label | Skewed blades |
| Total patents | 155 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 3 |
| 2017 | 7 |
| 2018 | 14 |
| 2019 | 16 |
| 2020 | 15 |
| 2021 | 15 |
| 2022 | 19 |
| 2023 | 27 |
| 2024 | 23 |
| 2025 | 12 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Axial fan
US-11022128-B2 · Jun 1, 2021 · US
Air-sending device and air-conditioning apparatus using the same
US-10890194-B2 · Jan 12, 2021 · US
Impeller and axial flow fan
US-10859095-B2 · Dec 8, 2020 · US
Hvac fan
US-2020355079-A1 · Nov 12, 2020 · US
Aircraft gas turbine engine variable fan blade mechanism
US-10801339-B2 · Oct 13, 2020 · US
Fan blade
US-2020240272-A1 · Jul 30, 2020 · US
Blade structure and fan and generator having same
US-10724537-B2 · Jul 28, 2020 · US
Series-connected fan
US-2020217322-A1 · Jul 9, 2020 · US
Rotary heat exchanger and system thereof
US-2020200186-A1 · Jun 25, 2020 · US
Propeller fan, air-sending device, and refrigeration cycle device
US-2020166048-A1 · May 28, 2020 · US
Reversible flow fan
US-10662973-B2 · May 26, 2020 · US
Propeller fan
US-2020158129-A1 · May 21, 2020 · US
Wind wheel and fan comprising the same
US-2020102965-A1 · Apr 2, 2020 · US
Full-span forward swept airfoils for gas turbine engines
US-10605260-B2 · Mar 31, 2020 · US
Aerodynamically and acoustically improved car fan
US-10584716-B2 · Mar 10, 2020 · US
Mixed-flow fan
US-10557476-B2 · Feb 11, 2020 · US
Aircraft fan with low part-span solidity
US-2020025213-A1 · Jan 23, 2020 · US
Axial fan
US-2019390677-A1 · Dec 26, 2019 · US
Cooling fan module
US-2019353083-A1 · Nov 21, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04D29/386?
- CPC F04D29/386 is the Cooperative Patent Classification code for “Skewed blades.”
- How many patents are filed under CPC F04D29/386 (Skewed blades)?
- Our database includes 155 publications tagged with this CPC code.
- Is patent activity under CPC F04D29/386 growing?
- Publication counts under this code: 23 in 2024 vs 12 in 2025 (latest complete years).