Fuel cell system and aircraft having an inerting system
US-2024379984-A1 · Nov 14, 2024 · US
Fuel cells in which the fuel is based on compounds containing nitrogen, e.g. hydrazine, ammonia
Fuel cells in which the fuel is based on compounds containing nitrogen, e.g. hydrazine, ammonia · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01M8/222 |
| Official title | {Fuel cells in which the fuel is based on compounds containing nitrogen, e.g. hydrazine, ammonia} |
| Display label | Fuel cells in which the fuel is based on compounds containing nitrogen, e.g. hydrazine, ammonia |
| Total patents | 133 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 11 |
| 2016 | 12 |
| 2017 | 12 |
| 2018 | 10 |
| 2019 | 14 |
| 2020 | 13 |
| 2021 | 14 |
| 2022 | 9 |
| 2023 | 10 |
| 2024 | 12 |
| 2025 | 10 |
| 2026 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Supported Ni-M materials for electrooxidation of hydrazine
US-10522843-B1 · Dec 31, 2019 · US
High solubility iron hexacyanides
US-2019363388-A1 · Nov 28, 2019 · US
Ammonia-based thermoelectrochemical systems and methods
US-10431842-B2 · Oct 1, 2019 · US
Control method and control system of hydrogen concentration for fuel cell
US-2019288314-A1 · Sep 19, 2019 · US
Nitrogen battery, fuel synthesizing apparatus, and fuel synthesizing method
US-2019260014-A1 · Aug 22, 2019 · US
High solubility iron hexacyanides
US-10374248-B2 · Aug 6, 2019 · US
Method of controlling hydrogen partial pressure for fuel cell system
US-2019207235-A1 · Jul 4, 2019 · US
Processes for forming coordination complexes containing monosulfonated catecholate ligands
US-10316047-B2 · Jun 11, 2019 · US
Membraneless direct-type fuel cells
US-2019173116-A1 · Jun 6, 2019 · US
Electrolytic cell for the production of ammonia
US-10309020-B2 · Jun 4, 2019 · US
Fuel cell system and method of controlling the same
US-2019140291-A1 · May 9, 2019 · US
Ammonia production method
US-2019092645-A1 · Mar 28, 2019 · US
Acid gas regenerable battery
US-2019027771-A1 · Jan 24, 2019 · US
Hydrogen supply method for fuel cell system
US-2019006688-A1 · Jan 3, 2019 · US
Electrochemical cell and process
US-2018342739-A1 · Nov 29, 2018 · US
Arrangement for a cathode recirculation in a fuel cell and method for cathode recirculation
US-2018301720-A1 · Oct 18, 2018 · US
Liquid phenothiazine catholytes for non-aqueous redox flow batteries
US-10103402-B2 · Oct 16, 2018 · US
Vehicle system comprising a fuel cell
US-2018226668-A1 · Aug 9, 2018 · US
High solubility iron hexacyanides
US-9997798-B2 · Jun 12, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01M8/222?
- CPC H01M8/222 is the Cooperative Patent Classification code for “Fuel cells in which the fuel is based on compounds containing nitrogen, e.g. hydrazine, ammonia.”
- How many patents are filed under CPC H01M8/222 (Fuel cells in which the fuel is based on compounds containing nitrogen, e.g. hydrazine, ammonia)?
- Our database includes 133 publications tagged with this CPC code.
- Is patent activity under CPC H01M8/222 growing?
- Publication counts under this code: 12 in 2024 vs 10 in 2025 (latest complete years).