Diffuser Restriction Ring
US-2018355890-A1 · Dec 13, 2018 · US
adjusting flow cross-section, otherwise than by using adjustable stator blades
adjusting flow cross-section, otherwise than by using adjustable stator 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 | F04D29/464 |
| Official title | {adjusting flow cross-section, otherwise than by using adjustable stator blades} |
| Display label | adjusting flow cross-section, otherwise than by using adjustable stator blades |
| Total patents | 309 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 18 |
| 2017 | 17 |
| 2018 | 20 |
| 2019 | 38 |
| 2020 | 44 |
| 2021 | 37 |
| 2022 | 47 |
| 2023 | 33 |
| 2024 | 25 |
| 2025 | 18 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Solenoid actuated safety compliant fan finger guard structures and methods
US-2018347593-A1 · Dec 6, 2018 · US
Variable diffuser with axially translating end wall for a centrifugal compressor
US-2018340549-A1 · Nov 29, 2018 · US
Slidable sleeve actuation system for a turbocharger compressor
US-2018340544-A1 · Nov 29, 2018 · US
Turbocharger Housing
US-2018328270-A1 · Nov 15, 2018 · US
Turbocharger systems and method to prevent compressor choke
US-10107296-B2 · Oct 23, 2018 · US
Regulator assembly and centrifugal compressor
US-10082147-B2 · Sep 25, 2018 · US
Adjustable-trim centrifugal compressor for a turbocharger
US-2018258842-A1 · Sep 13, 2018 · US
Variable-speed multi-stage refrigerant centrifugal compressor with diffusers
US-10072663-B2 · Sep 11, 2018 · US
Method for controlling a trim-adjustment mechanism for a centrifugal compressor
US-9989068-B2 · Jun 5, 2018 · US
Fan with shut-off valve and method of operating
US-2018142692-A1 · May 24, 2018 · US
Centrifugal blower and vacuum cleaner
US-2018100517-A1 · Apr 12, 2018 · US
Active swirl device for turbocharger compressor
US-9932991-B2 · Apr 3, 2018 · US
Blower assembly for a vehicle
US-9915271-B2 · Mar 13, 2018 · US
Linkage to actuate inlet guide vanes
US-9903451-B2 · Feb 27, 2018 · US
Centrifugal compressor
US-9874226-B2 · Jan 23, 2018 · US
Adjustable-trim centrifugal compressor, and turbocharger having same
US-9845723-B2 · Dec 19, 2017 · US
Variable area diffuser
US-2017350417-A1 · Dec 7, 2017 · US
Passive and semi-passive inlet-adjustment mechanisms for compressor, and turbocharger having same
US-9822698-B2 · Nov 21, 2017 · US
Centrifugal compressor diffuser control
US-9810228-B2 · Nov 7, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F04D29/464?
- CPC F04D29/464 is the Cooperative Patent Classification code for “adjusting flow cross-section, otherwise than by using adjustable stator blades.”
- How many patents are filed under CPC F04D29/464 (adjusting flow cross-section, otherwise than by using adjustable stator blades)?
- Our database includes 309 publications tagged with this CPC code.
- Is patent activity under CPC F04D29/464 growing?
- Publication counts under this code: 25 in 2024 vs 18 in 2025 (latest complete years).