Process for preparing hydrazine hydrate using an absorption column
US-2025376376-A1 · Dec 11, 2025 · US
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Hydrazine; Salts thereof
Hydrazine; 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 | C01B21/16 |
| Official title | Hydrazine; Salts thereof |
| Display label | Hydrazine; Salts thereof |
| Total patents | 16 |
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 | 3 |
| 2020 | 1 |
| 2021 | 1 |
| 2022 | 4 |
| 2024 | 3 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Process for preparing hydrazine hydrate in the presence of an anti-foaming agent
US-2025051164-A1 · Feb 13, 2025 · US
Process for preparing hydrazine hydrate with oxime recycling
US-12180070-B2 · Dec 31, 2024 · US
Process for preparing hydrazine hydrate with pyrazoline recycling
US-12134558-B2 · Nov 5, 2024 · US
Methods utilizing active quantum chemistry
US-2024317612-A1 · Sep 26, 2024 · US
Process for preparing hydrazine hydrate with oxime recycling
US-2022234892-A1 · Jul 28, 2022 · US
Improved process for preparing hydrazine hydrate with pyrazoline recycling
US-2022227627-A1 · Jul 21, 2022 · US
Electrochemical stack with solid electrolyte and method for making same
US-11367889-B2 · Jun 21, 2022 · US
Process for production of hydrazine hydrate
US-11225413-B2 · Jan 18, 2022 · US
Method for storing energy in the form of hydrazine carbonate
US-11091845-B2 · Aug 17, 2021 · US
Method for storing energy in the form of hydrazine carbonate
US-2020087800-A1 · Mar 19, 2020 · US
An improved process for production of hydrazine hydrate
US-2019367365-A1 · Dec 5, 2019 · US
Thermochemical ammonia and hydrocarbons
US-10315967-B2 · Jun 11, 2019 · US
Electrochemical stack with solid electrolyte and method for making same
US-2019044167-A1 · Feb 7, 2019 · US
Catalytic ammonia synthesis by transition metal molecular complexes
US-9815694-B2 · Nov 14, 2017 · US
Thermochemical ammonia and hydrocarbons
US-2015315032-A1 · Nov 5, 2015 · US