Vehicle exhaust system
US-2019360375-A1 · Nov 28, 2019 · US
Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage · 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 | F01N1/026 |
| Official title | {Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage} |
| Display label | Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage |
| Total patents | 150 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 8 |
| 2017 | 15 |
| 2018 | 12 |
| 2019 | 22 |
| 2020 | 21 |
| 2021 | 20 |
| 2022 | 23 |
| 2023 | 12 |
| 2024 | 7 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Exhaust Valve Damper
US-2019360374-A1 · Nov 28, 2019 · US
Muffler for an exhaust system of an internal combustion engine, especially for motor vehicles with hybrid drive
US-10465587-B2 · Nov 5, 2019 · US
Damping device
US-10465832-B2 · Nov 5, 2019 · US
Alignment system for slotted snap-action valve assembly for exhaust system
US-10436088-B2 · Oct 8, 2019 · US
Muffler unit
US-2019249588-A1 · Aug 15, 2019 · US
Muffler
US-2019234263-A1 · Aug 1, 2019 · US
Slip-type active noise control muffler and method for controlling the same
US-10364715-B2 · Jul 30, 2019 · US
Acoustic device
US-10352210-B2 · Jul 16, 2019 · US
Vehicle exhaust device
US-2019136739-A1 · May 9, 2019 · US
Tunable resonator
US-2019093565-A1 · Mar 28, 2019 · US
Exhaust device for internal combustion engine
US-2019085744-A1 · Mar 21, 2019 · US
Exhaust device for internal combustion engine
US-2019078476-A1 · Mar 14, 2019 · US
Damper for gas turbine
US-10228134-B2 · Mar 12, 2019 · US
Exhaust device for internal combustion engine
US-2019055866-A1 · Feb 21, 2019 · US
Structure of muffler
US-10208639-B2 · Feb 19, 2019 · US
Exhaust muffler for combustion engine
US-10196948-B2 · Feb 5, 2019 · US
Selectively tunable exhaust noise attenuation device
US-10180093-B2 · Jan 15, 2019 · US
Muffler for an exhaust system of an internal combustion engine
US-10167756-B2 · Jan 1, 2019 · US
Tunable resonator
US-10167780-B2 · Jan 1, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01N1/026?
- CPC F01N1/026 is the Cooperative Patent Classification code for “Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage.”
- How many patents are filed under CPC F01N1/026 (Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage)?
- Our database includes 150 publications tagged with this CPC code.
- Is patent activity under CPC F01N1/026 growing?
- Publication counts under this code: 7 in 2024 vs 4 in 2025 (latest complete years).