System and method for diagnosing an exhaust gas sensor
US-12169155-B2 · Dec 17, 2024 · US
with circulation of exhaust gases in closed or semi-closed circuits
with circulation of exhaust gases in closed or semi-closed circuits · 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 | F02D21/04 |
| Official title | with circulation of exhaust gases in closed or semi-closed circuits |
| Display label | with circulation of exhaust gases in closed or semi-closed circuits |
| Total patents | 36 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 4 |
| 2017 | 5 |
| 2018 | 2 |
| 2019 | 2 |
| 2020 | 2 |
| 2021 | 3 |
| 2022 | 6 |
| 2023 | 1 |
| 2024 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
System and method for diagnosing an exhaust gas sensor
US-2024272038-A1 · Aug 15, 2024 · US
Work vehicle power system with decoupled engine air system components
US-11572673-B2 · Feb 7, 2023 · US
Work vehicle power system with decoupled engine air system components
US-2022412053-A1 · Dec 29, 2022 · US
Systems for crankcase ventilation
US-11371400-B2 · Jun 28, 2022 · US
Systems for crankcase ventilation
US-2022154607-A9 · May 19, 2022 · US
Systems and methods for increasing engine power output under globally stoichiometric operation
US-11248554-B2 · Feb 15, 2022 · US
Systems for crankcase ventilation
US-2022010705-A1 · Jan 13, 2022 · US
Method and system for balancing cylinder air-fuel ratio
US-11220965-B2 · Jan 11, 2022 · US
Fuel oxygen conversion unit with a fuel/gas separator
US-11131256-B2 · Sep 28, 2021 · US
Systems and methods for increasing engine power output under globally stoichiometric operation
US-2021062748-A1 · Mar 4, 2021 · US
Method and system for balancing cylinder air-fuel ratio
US-2021047973-A1 · Feb 18, 2021 · US
Method and system for engine control
US-10677172-B2 · Jun 9, 2020 · US
Fuel Oxygen Conversion Unit with a Fuel/Gas Separator
US-2020141337-A1 · May 7, 2020 · US
Gas supply device for internal combustion engine and control method for the same
US-10451011-B2 · Oct 22, 2019 · US
System and method for operating an engine
US-10288016-B2 · May 14, 2019 · US
Gas supply device for internal combustion engine and control method for the same
US-2018334997-A1 · Nov 22, 2018 · US
System and method for operating an engine
US-2018058391-A1 · Mar 1, 2018 · US
Method and system for engine control
US-2017306858-A1 · Oct 26, 2017 · US
Airflow control systems and methods using model predictive control
US-9765703-B2 · Sep 19, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F02D21/04?
- CPC F02D21/04 is the Cooperative Patent Classification code for “with circulation of exhaust gases in closed or semi-closed circuits.”
- How many patents are filed under CPC F02D21/04 (with circulation of exhaust gases in closed or semi-closed circuits)?
- Our database includes 36 publications tagged with this CPC code.
- Is patent activity under CPC F02D21/04 growing?
- Publication counts under this code: 1 in 2023 vs 2 in 2024 (latest complete years).