Exhaust system, controller and method for an internal combustion engine
US-12378905-B2 · Aug 5, 2025 · US
Filtering additional air
Filtering additional air · 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 | F01N3/303 |
| Official title | {Filtering additional air} |
| Display label | Filtering additional air |
| Total patents | 42 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 3 |
| 2016 | 6 |
| 2017 | 2 |
| 2019 | 5 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 2 |
| 2024 | 9 |
| 2025 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Diesel exhaust fluid tank conduit connected to air compressor and method
US-2025188860-A1 · Jun 12, 2025 · US
Exhaust gas aftertreatment system
US-12305555-B2 · May 20, 2025 · US
Off-road vehicle and engine thereof
US-12270360-B2 · Apr 8, 2025 · US
Purification system
US-12258897-B2 · Mar 25, 2025 · US
Exhaust gas purification device and engine
US-12234761-B2 · Feb 25, 2025 · US
Method and device for operating an internal combustion engine
US-12140094-B2 · Nov 12, 2024 · US
Exhaust gas aftertreatment system
US-2024328337-A1 · Oct 3, 2024 · US
Purification system
US-2024309790-A1 · Sep 19, 2024 · US
Exhaust gas purification device and engine
US-2024309786-A1 · Sep 19, 2024 · US
Method and device for operating an internal combustion engine
US-2024309822-A1 · Sep 19, 2024 · US
Exhaust system, controller and method for an internal combustion engine
US-2024254905-A1 · Aug 1, 2024 · US
Exhaust gas aftertreatment system
US-12037932-B2 · Jul 16, 2024 · US
Air supply to an internal combustion engine and method and device for diagnosing an air supply to an internal combustion engine
US-2024191645-A1 · Jun 13, 2024 · US
Exhaust gas aftertreatment system
US-2024125263-A1 · Apr 18, 2024 · US
Off-Road Vehicle And Engine Thereof
US-2023313763-A1 · Oct 5, 2023 · US
Fuel system for a vehicle and method of controlling
US-11698037-B1 · Jul 11, 2023 · US
Removal of contaminants from air for use in aircraft engines
US-11473464-B2 · Oct 18, 2022 · US
Air filter with a primary air outlet and a secondary air outlet as well as filter element therefor
US-11415089-B2 · Aug 16, 2022 · US
Aspiration system for a work vehicle including an adjustably-sized venturi section
US-11230959-B2 · Jan 25, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01N3/303?
- CPC F01N3/303 is the Cooperative Patent Classification code for “Filtering additional air.”
- How many patents are filed under CPC F01N3/303 (Filtering additional air)?
- Our database includes 42 publications tagged with this CPC code.
- Is patent activity under CPC F01N3/303 growing?
- Publication counts under this code: 9 in 2024 vs 6 in 2025 (latest complete years).