Apparatus and method
US-2026054245-A1 · Feb 26, 2026 · US
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Nitrogen dioxide (NO2, N2O4) ({C01B21/203} , C01B21/26, C01B21/30 take precedence)
Nitrogen dioxide (NO2, N2O4) ({C01B21/203} , C01B21/26, C01B21/30 take precedence) · 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 | C01B21/36 |
| Official title | Nitrogen dioxide (NO2, N2O4) ({C01B21/203} , C01B21/26, C01B21/30 take precedence) |
| Display label | Nitrogen dioxide (NO2, N2O4) ({C01B21/203} , C01B21/26, C01B21/30 take precedence) |
| Total patents | 20 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2017 | 1 |
| 2019 | 1 |
| 2020 | 3 |
| 2021 | 3 |
| 2022 | 2 |
| 2023 | 3 |
| 2024 | 1 |
| 2025 | 4 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Comproportionation-based autocatalytic cycles and related methods
US-2025382173-A1 · Dec 18, 2025 · US
Ammonium nitrate production
US-2025381545-A1 · Dec 18, 2025 · US
Generation of oxygen from activated aluminum and inorganic acids
US-2025296839-A1 · Sep 25, 2025 · US
Methods and systems for automatically generating a remedial action in an industrial facility
US-12190701-B2 · Jan 7, 2025 · US
High energy recovery nitric acid process using liquid oxygen containing fluid
US-11905172-B2 · Feb 20, 2024 · US
Methods and systems for automatically generating a remedial action in an industrial facility
US-2023360511-A1 · Nov 9, 2023 · US
Process for the production of nitric acid
US-2023115002-A1 · Apr 13, 2023 · US
Generation of nitrogen dioxide for use with burner-based exhaust replication system
US-11573155-B2 · Feb 7, 2023 · US
Methods and systems for automatically generating a remedial action in an industrial facility
US-11508230-B2 · Nov 22, 2022 · US
Process for preparation of nitrogen oxides and nitric acid from nitrous oxide
US-11332370-B2 · May 17, 2022 · US
Relay administration device and nitric oxide administration system
US-2021370010-A1 · Dec 2, 2021 · US
High energy recovery nitric acid process using liquid oxygen containing fluid
US-2021300759-A1 · Sep 30, 2021 · US
Generation of Nitrogen Dioxide for Use with Burner-Based Exhaust Replication System
US-2021172835-A1 · Jun 10, 2021 · US
Process for preparation of nitrogen oxides and nitric acid from nitrous oxide
US-2020307999-A1 · Oct 1, 2020 · US
Process for preparation of nitrogen oxides and nitric acid from nitrous oxide
US-10723624-B2 · Jul 28, 2020 · US
Process for producing nitric acid
US-2020180959-A1 · Jun 11, 2020 · US
Process for preparation of nitrogen oxides and nitric acid from nitrous oxide
US-2019169029-A1 · Jun 6, 2019 · US
Methods and systems for automatically generating a remedial action in an industrial facility
US-2017352243-A1 · Dec 7, 2017 · US
Zn5(BTA)6(TDA)2—a robust highly interpenetrated metal-organic framework constructed from pentanuclear clusters for selective sorption of gas molecules
US-9127025-B2 · Sep 8, 2015 · US