Suction pulser intended for a heating, ventilation and/or air-conditioning device of a motor vehicle
US-10421336-B2 · Sep 24, 2019 · US
Double entry casings
Double entry casings · 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 | F04D29/424 |
| Official title | {Double entry casings} |
| Display label | Double entry casings |
| Total patents | 264 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 13 |
| 2016 | 12 |
| 2017 | 12 |
| 2018 | 17 |
| 2019 | 16 |
| 2020 | 32 |
| 2021 | 35 |
| 2022 | 34 |
| 2023 | 34 |
| 2024 | 32 |
| 2025 | 24 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Air mover
US-2019277305-A1 · Sep 12, 2019 · US
Fan device and method for manufacturing the same
US-2019078573-A1 · Mar 14, 2019 · US
Blower
US-2019017515-A1 · Jan 17, 2019 · US
Air mover inlet interface and cover
US-2019003491-A1 · Jan 3, 2019 · US
Air conditioner and blower device
US-2019003728-A1 · Jan 3, 2019 · US
Momentum Based Blower Interstitial Seal
US-2018347578-A1 · Dec 6, 2018 · US
Noise suppression systems
US-2018340463-A1 · Nov 29, 2018 · US
Air guide housing and ventilation, heating or air conditioning system with such an air guide housing
US-10137753-B2 · Nov 27, 2018 · US
Centrifugal fan
US-10132328-B2 · Nov 20, 2018 · US
Local ventilation equipment and blower therein
US-2018320698-A1 · Nov 8, 2018 · US
Thin fan with axial airgap
US-10107304-B2 · Oct 23, 2018 · US
Parallel compression in lng plants using a double flow compressor
US-2018283774-A1 · Oct 4, 2018 · US
Noise suppression systems
US-10077707-B2 · Sep 18, 2018 · US
Centrifugal fan
US-2018223865-A1 · Aug 9, 2018 · US
Centrifugal blower wheel for HVACR applications
US-10030667-B2 · Jul 24, 2018 · US
Blower and exhaust fan comprising the same
US-2018187686-A1 · Jul 5, 2018 · US
Centrifugal fan
US-9964119-B2 · May 8, 2018 · US
Sirocco fan and air conditioner having same
US-9964118-B2 · May 8, 2018 · US
Thin cooling fan
US-2018066664-A1 · Mar 8, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04D29/424?
- CPC F04D29/424 is the Cooperative Patent Classification code for “Double entry casings.”
- How many patents are filed under CPC F04D29/424 (Double entry casings)?
- Our database includes 264 publications tagged with this CPC code.
- Is patent activity under CPC F04D29/424 growing?
- Publication counts under this code: 32 in 2024 vs 24 in 2025 (latest complete years).