Fuel cell chemical filter monitoring system and methods
US-2024113317-A1 · Apr 4, 2024 · US
Concentration; Density (H01M8/04492 takes precedence)
Concentration; Density (H01M8/04492 takes precedence) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01M8/0444 |
| Official title | Concentration; Density (H01M8/04492 takes precedence) |
| Display label | Concentration; Density (H01M8/04492 takes precedence) |
| Total patents | 274 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 12 |
| 2016 | 25 |
| 2017 | 26 |
| 2018 | 21 |
| 2019 | 24 |
| 2020 | 23 |
| 2021 | 19 |
| 2022 | 26 |
| 2023 | 29 |
| 2024 | 33 |
| 2025 | 27 |
| 2026 | 9 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Distribution of electrolytes in a flow battery
US-9853310-B2 · Dec 26, 2017 · US
Hydrogen detecting sensor
US-9846146-B2 · Dec 19, 2017 · US
Fuel cell assembly and associated method of operation
US-2017352904-A1 · Dec 7, 2017 · US
Apparatus and method for softsensing fuel cell system
US-9806363-B2 · Oct 31, 2017 · US
Power generation system and method of operating power generation system
US-9791154-B2 · Oct 17, 2017 · US
Fuel cell for detecting a pollutant
US-2017279129-A1 · Sep 28, 2017 · US
Fuel cell system and method of controlling fuel cell system
US-2017256806-A1 · Sep 7, 2017 · US
On-line monitoring of process/system
US-2017250428-A1 · Aug 31, 2017 · US
Fuel cell device and operation control method for fuel cell device
US-2017237095-A1 · Aug 17, 2017 · US
Hydrogen quality monitor
US-9726635-B2 · Aug 8, 2017 · US
Method and system for eliminating reverse current decay in fuel cells
US-2017200959-A1 · Jul 13, 2017 · US
Hydrogen generation apparatus, fuel cell system including the same, method of operating hydrogen generation apparatus and method of operating fuel cell system
US-9685672-B2 · Jun 20, 2017 · US
System and method of controlling fuel cell system using a drain-purge valve
US-9660280-B2 · May 23, 2017 · US
Method for controlling startup of fuel cell system
US-9660281-B2 · May 23, 2017 · US
Fuel cell system
US-9653742-B2 · May 16, 2017 · US
Gas sensor including first electrode, second electrode, metal oxide layer, and insulating film, and fuel-cell vehicle including the gas sensor
US-2017131227-A1 · May 11, 2017 · US
Fuel cell vehicle
US-2017113531-A1 · Apr 27, 2017 · US
Anode leak location detection
US-9564648-B2 · Feb 7, 2017 · US
Metal-air battery, vehicle system comprising the metal-air battery, and method of operating the metal-air battery
US-2017033379-A1 · Feb 2, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01M8/0444?
- CPC H01M8/0444 is the Cooperative Patent Classification code for “Concentration; Density (H01M8/04492 takes precedence).”
- How many patents are filed under CPC H01M8/0444 (Concentration; Density (H01M8/04492 takes precedence))?
- Our database includes 274 publications tagged with this CPC code.
- Is patent activity under CPC H01M8/0444 growing?
- Publication counts under this code: 33 in 2024 vs 27 in 2025 (latest complete years).