Exhaust purification device
US-12528049-B2 · Jan 20, 2026 · US
using electric valves only
using electric valves only · 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 | F01N3/222 |
| Official title | {using electric valves only} |
| Display label | using electric valves only |
| Total patents | 35 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 2 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 4 |
| 2020 | 2 |
| 2021 | 5 |
| 2022 | 6 |
| 2023 | 3 |
| 2024 | 3 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Exhaust purification device
US-2025269326-A1 · Aug 28, 2025 · US
Exhaust system, controller and method for an internal combustion engine
US-12378905-B2 · Aug 5, 2025 · US
Internal Combustion Engine for a Motor Vehicle, in Particular for a Car
US-2025059902-A1 · Feb 20, 2025 · US
Method and device for diagnosing coking in a secondary air system of an internal combustion engine
US-12116914-B2 · Oct 15, 2024 · US
Exhaust system, controller and method for an internal combustion engine
US-2024254905-A1 · Aug 1, 2024 · US
Method, processing unit, and computer program for ascertaining an air volume provided by means of an electric air pump in an exhaust system of an internal combustion engine
US-11879368-B2 · Jan 23, 2024 · US
Exhaust aftertreatment system
US-11674426-B2 · Jun 13, 2023 · US
Exhaust aftertreatment system
US-2023105660-A1 · Apr 6, 2023 · US
Method, processing unit, and computer program for ascertaining an air volume provided by means of an electric air pump in an exhaust system of an internal combustion engine
US-2023061467-A1 · Mar 2, 2023 · US
Method for detecting a sensor anomality
US-2022341354-A1 · Oct 27, 2022 · US
Method And Device For Diagnosing Coking In A Secondary Air System Of An Internal Combustion Engine
US-2022290603-A1 · Sep 15, 2022 · US
Secondary air introduction device
US-11384672-B2 · Jul 12, 2022 · US
Secondary air introduction device
US-2022112829-A1 · Apr 14, 2022 · US
Exhaust gas purification system with air injection
US-2022065149-A1 · Mar 3, 2022 · US
Method for operating an internal combustion engine with a secondary air system
US-11220945-B2 · Jan 11, 2022 · US
Method for Operating an Internal Combustion Engine with a Secondary Air System
US-2021348539-A1 · Nov 11, 2021 · US
Method and system for exhaust air injection
US-11073059-B2 · Jul 27, 2021 · US
Catalyst protection system from oxygen deprived exhaust
US-11035282-B2 · Jun 15, 2021 · US
Method and system for exhaust air injection
US-2021054772-A1 · Feb 25, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01N3/222?
- CPC F01N3/222 is the Cooperative Patent Classification code for “using electric valves only.”
- How many patents are filed under CPC F01N3/222 (using electric valves only)?
- Our database includes 35 publications tagged with this CPC code.
- Is patent activity under CPC F01N3/222 growing?
- Publication counts under this code: 3 in 2024 vs 3 in 2025 (latest complete years).