Thermally driven nitrogen and ammonia production
US-2025346489-A1 · Nov 13, 2025 · US
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by reduction
by reduction · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C01B21/0422 |
| Official title | {by reduction} |
| Display label | by reduction |
| Total patents | 23 |
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 | 2 |
| 2017 | 2 |
| 2018 | 2 |
| 2019 | 6 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 1 |
| 2023 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Photocatalyst comprising bimetallic nanoparticles and graphene oxide for denitrification reaction, and water treatment method using same
US-11642662-B2 · May 9, 2023 · US
Photocatalyst comprising bimetallic nanoparticles and graphene oxide for denitrification reaction, and water treatment method using same
US-2022258139-A1 · Aug 18, 2022 · US
Process for argon and nitrogen production
US-11104576-B2 · Aug 31, 2021 · US
Thermally driven nitrogen and ammonia production
US-2021188636-A1 · Jun 24, 2021 · US
SCR diesel particle filter with oxidation catalyst and oxygen storage catalyst loadings, and exhaust system including the same
US-10914214-B2 · Feb 9, 2021 · US
Bi-metallic oxidation catalyst materials and appurtenant devices and systems
US-10753247-B2 · Aug 25, 2020 · US
Process for argon and nitrogen production
US-2020165131-A1 · May 28, 2020 · US
Single step solution combustion synthesis of crystalline transuranic-doped rare earth zirconate pyrochlores
US-10590005-B2 · Mar 17, 2020 · US
Single step solution combustion synthesis of crystalline transuranic-doped rare earth zirconate pyrochlores
US-2019300384-A1 · Oct 3, 2019 · US
Ammonia sensor calibration method
US-10400649-B2 · Sep 3, 2019 · US
Bi-metallic oxidation catalyst materials and appurtenant devices and systems
US-2019257232-A1 · Aug 22, 2019 · US
Selective catalytic reduction steady state ammonia slip detection with positive perturbation
US-10344654-B2 · Jul 9, 2019 · US
Gas purifier
US-10245554-B2 · Apr 2, 2019 · US
Selective catalytic reduction steady state ammonia slip detection with positive perturbation
US-2019078480-A1 · Mar 14, 2019 · US
Ammonia sensor calibration method
US-2018195426-A1 · Jul 12, 2018 · US
Scr diesel particle filter with oxidation catalyst and oxygen storage catalyst loadings, and exhaust system including the same
US-2018080359-A1 · Mar 22, 2018 · US
Gas Purifier
US-2017333841-A1 · Nov 23, 2017 · US
Gas purifier
US-9694319-B2 · Jul 4, 2017 · US
Catalyst and method of manufacture
US-9375710-B2 · Jun 28, 2016 · US