H01M 8/04298
Processes for controlling fuel cells or fuel cell systems
H01M8/04298 (Processes for controlling fuel cells or fuel cell systems) appears on 6,041 US grants and 9,020 published applications in this corpus.
Search patents in H01M- Granted patents
- 6,041
- Published applications
- 9,020
- Assignees
- 1,309
- Inventors
- 10,333
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 7 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 8 | 0 |
| 1992 | 8 | 0 |
| 1993 | 2 | 0 |
| 1994 | 6 | 0 |
| 1995 | 4 | 0 |
| 1996 | 6 | 0 |
| 1997 | 12 | 0 |
| 1998 | 12 | 0 |
| 1999 | 12 | 0 |
| 2000 | 20 | 0 |
| 2001 | 28 | 27 |
| 2002 | 46 | 133 |
| 2003 | 72 | 165 |
| 2004 | 95 | 239 |
| 2005 | 82 | 294 |
| 2006 | 110 | 311 |
| 2007 | 102 | 312 |
| 2008 | 112 | 339 |
| 2009 | 136 | 370 |
| 2010 | 179 | 469 |
| 2011 | 236 | 347 |
| 2012 | 275 | 311 |
| 2013 | 280 | 292 |
| 2014 | 307 | 374 |
| 2015 | 282 | 347 |
| 2016 | 281 | 362 |
| 2017 | 279 | 340 |
| 2018 | 296 | 373 |
| 2019 | 334 | 424 |
| 2020 | 370 | 403 |
| 2021 | 377 | 390 |
| 2022 | 400 | 466 |
| 2023 | 436 | 585 |
| 2024 | 252 | 476 |
| 2025 | 317 | 465 |
| 2026 | 229 | 406 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01M 8/04694Characterised by variables to be controlled4,787
- H01M 8/04313Characterised by the detection or assessment of variables4,550
- H01M 8/043Applied during specific periods1,178
- H01M 8/04992Characterised by the implementation of mathematical or computational algorithms712
- H01M 8/04305Modeling, demonstration models of fuel cells86
Recent patents
- Fuel cell system and fuel cell vehicle6 Oct 2026US 12,752,643 B2Kabushiki Kaisha Toyota Jidoshokki
- Fuel cell vehicle with differential pressure flow meter for humidity measurement6 Oct 2026US 12,752,667 B2Ford Global Technologies, LLC
- Fuel cell vehicle and controlling method thereof6 Oct 2026US 12,752,668 B2Hyundai Motor Company
- Hybrid hydrogen fuel cell combustor power system6 Oct 2026US 12,755,989 B2Caterpillar Inc.
- Method for controlling a drying process of a fuel cell system6 Oct 2026US 12,755,992 B2Robert Bosch GmbH
- Advanced power electronic circuit for fuel cell vehicles enabling independent cooling of various systems8 Oct 2026US 2026/0307542 A1Ford Global Technologies, LLC
- Purge air sealing valve8 Oct 2026US 2026/0309238 A1GM Global Technology Operations LLC
- Managing a fuel cell system in a fuel cell vehicle8 Oct 2026US 2026/0312087 A1Volvo Truck Corporation
- Fuel cell system with improved humidifier8 Oct 2026US 2026/0312088 A1Plastic Omnium New Energies France
- Fuel cell system and purging method for inerting a fuel cell system8 Oct 2026US 2026/0312091 A1
Most cited
By later US patents
- Method and apparatus for monitoring fuel cell performance359US 5,170,124 AMinister of National Defence of Her Majesty's Canadian Government · 1992
- Fuel cell gas management system240US 6,013,385 AEmprise Corporation · 2000
- Power supply apparatus220US 6,882,131 B1Matsushita Electric Industrial Co., Ltd. · 2005
- Surface replica fuel cell for micro fuel cell electrical power pack208US 5,759,712 A1998
- Automatic voltage imbalance detector205US 4,424,491 AThe United States of America as represented by the United States Department of Energy · 1984