Decomposition chambers for aftertreatment systems
US-12492656-B2 · Dec 9, 2025 · US
Reductants
Reductants · Cooperative Patent Classification (CPC)
Separating, mixing, shaping, printing, and transporting materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | B01D2251/20 |
| Official title | Reductants |
| Display label | Reductants |
| Total patents | 48 |
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 | 2 |
| 2016 | 8 |
| 2017 | 4 |
| 2018 | 6 |
| 2019 | 8 |
| 2020 | 3 |
| 2021 | 6 |
| 2022 | 2 |
| 2023 | 4 |
| 2024 | 3 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for treating greenhouse gases and system applying the same
US-2025369377-A1 · Dec 4, 2025 · US
Decomposition chambers for aftertreatment systems
US-2024200480-A1 · Jun 20, 2024 · US
Methods and systems for removing hydrogen peroxide from a gas
US-2024181104-A1 · Jun 6, 2024 · US
Gas purification apparatus and method
US-11931687-B2 · Mar 19, 2024 · US
Ozone scrubber and ozone scrubbing method
US-2023364555-A1 · Nov 16, 2023 · US
System and method for resource recycling of sulfur dioxide
US-11731874-B2 · Aug 22, 2023 · US
System, apparatus, and method for diesel exhaust fluid (DEF) dosing
US-11732629-B1 · Aug 22, 2023 · US
System and method for resource recycling of sulfur dioxide
US-2023046206-A1 · Feb 16, 2023 · US
Aluminum oxide aerogels and methods of making and use thereof
US-11472713-B2 · Oct 18, 2022 · US
Method of desalting crude oil with improved iron (Fe) reduction performance
US-11225615-B2 · Jan 18, 2022 · US
Exhaust gas treatment device and exhaust gas treatment method
US-11209165-B2 · Dec 28, 2021 · US
Plasma abatement of compounds containing heavy atoms
US-11185815-B2 · Nov 30, 2021 · US
Exhaust gas treatment device and exhaust gas treatment method
US-2021356129-A1 · Nov 18, 2021 · US
Method for treating exhaust gas containing elemental fluorine
US-2021162341-A1 · Jun 3, 2021 · US
Process for removing pollutants from a flue gas
US-10913030-B2 · Feb 9, 2021 · US
Method of Desalting Crude Oil with Improved Iron (Fe) Reduction Performance
US-2021002561-A1 · Jan 7, 2021 · US
Boiler
US-10730014-B2 · Aug 4, 2020 · US
Aluminum oxide aerogels and methods of making and use thereof
US-2020239326-A1 · Jul 30, 2020 · US
Method for the removal of oxygen from an industrial gas
US-10675585-B2 · Jun 9, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC B01D2251/20?
- CPC B01D2251/20 is the Cooperative Patent Classification code for “Reductants.”
- How many patents are filed under CPC B01D2251/20 (Reductants)?
- Our database includes 48 publications tagged with this CPC code.
- Is patent activity under CPC B01D2251/20 growing?
- Publication counts under this code: 3 in 2024 vs 2 in 2025 (latest complete years).