Air-transparent selective sound silencer using ultra-open metamaterial
US-12352190-B2 · Jul 8, 2025 · US
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using spirally or helically shaped channels (cyclones B04C)
using spirally or helically shaped channels (cyclones B04C) · 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 | F01N1/12 |
| Official title | using spirally or helically shaped channels (cyclones B04C) |
| Display label | using spirally or helically shaped channels (cyclones B04C) |
| Total patents | 17 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2017 | 2 |
| 2018 | 1 |
| 2020 | 1 |
| 2021 | 2 |
| 2022 | 3 |
| 2023 | 4 |
| 2024 | 1 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Sound attenuator as well as elements and a method of production thereof
US-12305547-B2 · May 20, 2025 · US
Air-transparent selective sound silencer using ultra-open metamaterial
US-2024077008-A1 · Mar 7, 2024 · US
Air-transparent selective sound silencer using ultra-open metamaterial
US-11846217-B2 · Dec 19, 2023 · US
Overlapping vane muffler
US-11773760-B2 · Oct 3, 2023 · US
Sound absorbing structure having one or more acoustic scatterers attached to or forming a vehicle structure
US-11776521-B2 · Oct 3, 2023 · US
Exhaust system and muffler
US-11692470-B2 · Jul 4, 2023 · US
Exhaust system and muffler
US-2022220874-A1 · Jul 14, 2022 · US
Sound absorbing structure having one or more acoustic scatterers attached to or forming a vehicle structure
US-2022189446-A1 · Jun 16, 2022 · US
A sound attenuator as well as elements and a method of production thereof
US-2022099006-A1 · Mar 31, 2022 · US
Air-transparent selective sound silencer using ultra-open metamaterial
US-2021087957-A1 · Mar 25, 2021 · US
Air-transparent selective sound silencer using ultra-open metamaterial
US-10947876-B2 · Mar 16, 2021 · US
Air-transparent selective sound silencer using ultra-open metamaterial
US-2020043456-A1 · Feb 6, 2020 · US
Cyclonic thermal diffuser and method
US-10001048-B2 · Jun 19, 2018 · US
Cyclonic thermal diffuser and method
US-2017268403-A1 · Sep 21, 2017 · US
Mixer assembly for exhaust aftertreatment system
US-9534525-B2 · Jan 3, 2017 · US
Mixer Assembly For Exhaust Aftertreatment System
US-2016348557-A1 · Dec 1, 2016 · US