H01M 8/04492
Humidity
Official title: Humidity; Ambient humidity; Water content
H01M8/04492 (Humidity) appears on 503 US grants and 730 published applications in this corpus.
Search patents in H01M- Granted patents
- 503
- Published applications
- 730
- Assignees
- 190
- Inventors
- 1,251
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2001 | 0 | 4 |
| 2002 | 1 | 8 |
| 2003 | 5 | 8 |
| 2004 | 4 | 17 |
| 2005 | 7 | 19 |
| 2006 | 9 | 21 |
| 2007 | 9 | 26 |
| 2008 | 10 | 31 |
| 2009 | 5 | 43 |
| 2010 | 23 | 50 |
| 2011 | 18 | 24 |
| 2012 | 24 | 26 |
| 2013 | 32 | 28 |
| 2014 | 32 | 37 |
| 2015 | 25 | 32 |
| 2016 | 29 | 37 |
| 2017 | 32 | 32 |
| 2018 | 36 | 26 |
| 2019 | 36 | 42 |
| 2020 | 31 | 30 |
| 2021 | 31 | 23 |
| 2022 | 32 | 25 |
| 2023 | 24 | 45 |
| 2024 | 13 | 35 |
| 2025 | 16 | 36 |
| 2026 | 19 | 25 |
By publication year. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electric energy managing system and method thereof29 Sep 2026US 12,746,853 B2Industrial Technology Research Institute
- Method and system for dynamically modifying fuel cell stack current to manage fuel cell membrane hydration29 Sep 2026US 12,749,697 B2Ford Global Technologies, LLC
- Catalyst deterioration suppression device21 Jul 2026US 12,689,049 B2Kabushiki Kaisha Toyota Chuo Kenkyusho
- Activation method for fuel cell and device therefor21 Jul 2026US 12,689,051 B2Honda Motor Co., Ltd.
- Method for determining aging of a fuel cell system9 Jun 2026US 12,651,759 B2Volvo Truck Corporation
- Method for operating a fuel cell system, and control device8 Oct 2026US 2026/0312093 A1Robert Bosch GmbH
- Fuel cell activation device1 Oct 2026US 2026/0302287 A1Honda Motor Co., Ltd.
- Fuel cell system and control method thereof17 Sep 2026US 2026/0279862 A1Honda Motor Co., Ltd.
- Method and system for effecting and determining a defect on a pem fuel cell3 Sep 2026US 2026/0259268 A1AVL List GmbH
- Fuel cell system27 Aug 2026US 2026/0253926 A1Toyota Jidosha Kabushiki Kaisha
Most cited
By later US patents
- System and method for controlling the humidity level of a fuel cell92US 6,376,111 B1General Motors Corporation · 2002
- Solid polymer electrolyte fuel cell and non-humidifying operating method therefor22US 6,566,001 B2Honda Giken Kogyo Kabushiki Kaisha · 2003
- Fuel cell system and control method for fuel cell system19US 9,105,891 B2Toyota Jidosha Kabushiki Kaisha · 2015
- Relative humidity sensor with compensation for changes in pressure and gas composition16US 6,777,120 B2General Motors Corporation · 2004
- Fuel cell system containing humidity sensor and method of operating thereof13US 10,581,090 B2Bloom Energy Corporation · 2020