Air-transparent selective sound silencer using ultra-open metamaterial
US-11846217-B2 · Dec 19, 2023 · US
by using interference effect
by using interference effect · 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 | F01N1/06 |
| Official title | by using interference effect |
| Display label | by using interference effect |
| Total patents | 69 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 1 |
| 2017 | 7 |
| 2018 | 4 |
| 2019 | 11 |
| 2020 | 13 |
| 2021 | 7 |
| 2022 | 7 |
| 2023 | 6 |
| 2024 | 6 |
| 2025 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Drone elimination muffler
US-2023304425-A1 · Sep 28, 2023 · US
Systems and methods for equalizing backpressure in engine cylinders
US-11686239-B2 · Jun 27, 2023 · US
Muffler
US-11680502-B2 · Jun 20, 2023 · US
Drone elimination muffler
US-11655740-B2 · May 23, 2023 · US
Sound bypass
US-2023039045-A1 · Feb 9, 2023 · US
Exhaust sound attenuation device
US-11434794-B2 · Sep 6, 2022 · US
Systems and methods for equalizing backpressure in engine cylinders
US-2022228521-A1 · Jul 21, 2022 · US
Exhaust system and muffler
US-11391195-B2 · Jul 19, 2022 · US
System and method for a cab-mounted muffler assembly
US-2022178298-A1 · Jun 9, 2022 · US
Systems and methods for equalizing backpressure in engine cylinders
US-11319860-B2 · May 3, 2022 · US
Exhaust device for internal combustion engine
US-11248504-B2 · Feb 15, 2022 · US
Exhaust device for internal combustion engine
US-11236652-B2 · Feb 1, 2022 · US
Muffler
US-2021246818-A1 · Aug 12, 2021 · US
Muffler system
US-2021231036-A1 · Jul 29, 2021 · US
Sound attenuating engine exhaust system
US-2021231035-A1 · Jul 29, 2021 · US
Road vehicle with an internal combustion engine and provided with an exhaust noise transmission device
US-11028743-B2 · Jun 8, 2021 · 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
Exhaust Sound Bypass
US-2021062696-A1 · Mar 4, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01N1/06?
- CPC F01N1/06 is the Cooperative Patent Classification code for “by using interference effect.”
- How many patents are filed under CPC F01N1/06 (by using interference effect)?
- Our database includes 69 publications tagged with this CPC code.
- Is patent activity under CPC F01N1/06 growing?
- Publication counts under this code: 6 in 2024 vs 3 in 2025 (latest complete years).