System for the removal of particulate matter and noxious compounds from engine exhaust gas
US-2019376434-A1 · Dec 12, 2019 · US
General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
General auxiliary catalysts, e.g. upstream or downstream of the main catalyst · 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 | F01N3/105 |
| Official title | {General auxiliary catalysts, e.g. upstream or downstream of the main catalyst} |
| Display label | General auxiliary catalysts, e.g. upstream or downstream of the main catalyst |
| Total patents | 193 |
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 | 4 |
| 2016 | 12 |
| 2017 | 16 |
| 2018 | 15 |
| 2019 | 22 |
| 2020 | 21 |
| 2021 | 26 |
| 2022 | 29 |
| 2023 | 22 |
| 2024 | 14 |
| 2025 | 9 |
| 2026 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Selective catalytic reduction device control
US-2019353071-A1 · Nov 21, 2019 · US
Delay based feed forward strategy to control pressure in a diesel exhaust fluid delivery system
US-2019353070-A1 · Nov 21, 2019 · US
System for the removal of particulate matter and noxious compounds from engine exhaust gas
US-10443478-B2 · Oct 15, 2019 · US
Exhaust gas purification filter
US-2019299139-A1 · Oct 3, 2019 · US
Catalyst article for use in an emission treatment system
US-2019301334-A1 · Oct 3, 2019 · US
Exhaust gas cleaning system for internal combustion engine and exhaust gas cleaning method for internal combustion engine
US-10415448-B2 · Sep 17, 2019 · US
Exhaust gas purification apparatus for an internal combustion engine
US-2019271249-A1 · Sep 5, 2019 · US
Exhaust gas control apparatus for internal combustion engine
US-10392993-B1 · Aug 27, 2019 · US
Method for desulfurization of selective catalytic reduction devices
US-10309278-B2 · Jun 4, 2019 · US
Exhaust gas purification device
US-2019120104-A1 · Apr 25, 2019 · US
Open emission analysis method and device
US-2019101474-A1 · Apr 4, 2019 · US
Catalytic converter and method of controlling exhaust emission
US-10213778-B2 · Feb 26, 2019 · US
Catalytic converter and exhaust-gas aftertreatment arrangement
US-10107166-B2 · Oct 23, 2018 · US
Exhaust gas purification apparatus for an internal combustion engine
US-10107163-B2 · Oct 23, 2018 · US
Catalyzed ceramic candle filter and method of cleaning process off- or exhaust gases
US-10076743-B2 · Sep 18, 2018 · US
Deterioration diagnosis apparatus for selective catalytic reduction catalyst
US-10072553-B2 · Sep 11, 2018 · US
System for the removal of particulate matter and noxious compounds from engine exhaust gas
US-2018195428-A1 · Jul 12, 2018 · US
Exhaust system
US-10018091-B2 · Jul 10, 2018 · US
Exhaust-gas-purifying system of internal combustion engine, method of using exhaust-gas-purifying catalyst and method of controlling air-fuel ratio
US-2018178165-A1 · Jun 28, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC F01N3/105?
- CPC F01N3/105 is the Cooperative Patent Classification code for “General auxiliary catalysts, e.g. upstream or downstream of the main catalyst.”
- How many patents are filed under CPC F01N3/105 (General auxiliary catalysts, e.g. upstream or downstream of the main catalyst)?
- Our database includes 193 publications tagged with this CPC code.
- Is patent activity under CPC F01N3/105 growing?
- Publication counts under this code: 14 in 2024 vs 9 in 2025 (latest complete years).