Comproportionation-based autocatalytic cycles and related methods
US-2025382173-A1 · Dec 18, 2025 · US
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Nitrous acid; Salts thereof
Nitrous acid; Salts thereof · 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 | C01B21/50 |
| Official title | Nitrous acid; Salts thereof |
| Display label | Nitrous acid; Salts thereof |
| Total patents | 18 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2018 | 1 |
| 2019 | 1 |
| 2020 | 1 |
| 2021 | 2 |
| 2022 | 3 |
| 2024 | 4 |
| 2025 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Organic compound, perovskite precursor solution, perovskite film, perovskite cell, and electric apparatus
US-2025386725-A1 · Dec 18, 2025 · US
Nitrous acid measurement by catalytic conversion to nitric oxide on sulfonated tetrafluoroethylene -based fluoropolymer-copolymer surfaces
US-2025313470-A1 · Oct 9, 2025 · US
Atomizer and atomizing method
US-2025235568-A1 · Jul 24, 2025 · US
Nitrogenous gas sustained releasing agent and nitrogenous gas sustained releaser composed of the same as well as nitrogenous gas sustained releasing method, respiratory equipment, package, and sustained releasing apparatus using the sustained releaser
US-12268709-B2 · Apr 8, 2025 · US
Pharmaceutical formulations of nitrite and uses thereof
US-12139402-B2 · Nov 12, 2024 · US
Powder composition
US-2024336482-A1 · Oct 10, 2024 · US
Methods for Oxidizing a Nitrogen Oxide to Nitrate
US-2024190706-A1 · Jun 13, 2024 · US
System and method for removing nitrate from water
US-11964884-B2 · Apr 23, 2024 · US
Nitrogenous gas sustained releasing agent and nitrogenous gas sustained releaser composed of the same as well as nitrogenous gas sustained releasing method, respiratory equipment, package, and sustained releasing apparatus using the sustained releaser
US-2022211748-A1 · Jul 7, 2022 · US
Pharmaceutical formulations of nitrite and uses thereof
US-2022169508-A1 · Jun 2, 2022 · US
Pharmaceutical formulations of nitrite and uses thereof
US-11247902-B2 · Feb 15, 2022 · US
Hydrogen sulfide and/or nitrite in the treatment and prevention of atrial fibrillation
US-11116731-B2 · Sep 14, 2021 · US
System and method for removing nitrate from water
US-2021276891-A1 · Sep 9, 2021 · US
Pharmaceutical formulations of nitrite and uses thereof
US-2020121714-A1 · Apr 23, 2020 · US
Hydrogen sulfide and/or nitrite in the treatment and prevention of atrial fibrillation
US-2019365669-A1 · Dec 5, 2019 · US
Nitrous acid generator
US-9856144-B2 · Jan 2, 2018 · US
Nitrous acid generator
US-2016039675-A1 · Feb 11, 2016 · US