H01M 8/04
Auxiliary arrangements
Official title: Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
H01M8/04 (Auxiliary arrangements) appears on 13,193 US grants and 18,840 published applications in this corpus.
Search patents in H01M- Granted patents
- 13,193
- Published applications
- 18,840
- Assignees
- 2,731
- Inventors
- 20,405
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 10 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 10 | 0 |
| 1981 | 13 | 0 |
| 1982 | 12 | 0 |
| 1983 | 14 | 0 |
| 1984 | 11 | 0 |
| 1985 | 17 | 0 |
| 1986 | 18 | 0 |
| 1987 | 27 | 0 |
| 1988 | 25 | 0 |
| 1989 | 31 | 0 |
| 1990 | 24 | 0 |
| 1991 | 21 | 0 |
| 1992 | 24 | 0 |
| 1993 | 36 | 0 |
| 1994 | 45 | 0 |
| 1995 | 30 | 0 |
| 1996 | 44 | 0 |
| 1997 | 38 | 0 |
| 1998 | 53 | 0 |
| 1999 | 90 | 0 |
| 2000 | 101 | 0 |
| 2001 | 139 | 104 |
| 2002 | 205 | 433 |
| 2003 | 290 | 589 |
| 2004 | 326 | 817 |
| 2005 | 322 | 883 |
| 2006 | 364 | 928 |
| 2007 | 338 | 992 |
| 2008 | 360 | 924 |
| 2009 | 418 | 992 |
| 2010 | 642 | 1010 |
| 2011 | 632 | 730 |
| 2012 | 682 | 650 |
| 2013 | 580 | 566 |
| 2014 | 609 | 702 |
| 2015 | 542 | 701 |
| 2016 | 491 | 662 |
| 2017 | 554 | 621 |
| 2018 | 531 | 633 |
| 2019 | 609 | 646 |
| 2020 | 611 | 631 |
| 2021 | 557 | 605 |
| 2022 | 613 | 753 |
| 2023 | 641 | 936 |
| 2024 | 472 | 885 |
| 2025 | 532 | 776 |
| 2026 | 409 | 671 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01M 8/04082Arrangements for control of reactant parameters8,031
- H01M 8/04298Processes for controlling fuel cells or fuel cell systems6,041
- H01M 8/04007Related to heat exchange4,498
- H01M 8/04223During start-up or shut-down2,386
- H01M 8/04291Arrangements for managing water in solid electrolyte fuel cell systems801
- H01M 8/04276Arrangements for managing the electrolyte stream300
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
- Hollow fiber membrane material for high-humidification hydrogen fuel cell humidifier and preparation method and application thereof6 Oct 2026US 12,753,530 B2University of Electronic Science and Technology of China
- Thermal energy storage system coupled with a solid oxide electrolysis system6 Oct 2026US 12,753,710 B2Rondo Energy, Inc.
- Hollow fiber membrane module8 Oct 2026US 2026/0307014 A1Nok Corporation
- Advanced power electronic circuit for fuel cell vehicles enabling independent cooling of various systems8 Oct 2026US 2026/0307542 A1Ford Global Technologies, LLC
- Wall element, especially for a safe chamber, as well as a safe chamber, an aircraft component and an aircraft equipped therewith8 Oct 2026US 2026/0307817 A1
- Propylene Carbonate Based Heat Transfer Fluid8 Oct 2026US 2026/0308436 A1CCI North America Corporation
- Purge air sealing valve8 Oct 2026US 2026/0309238 A1GM Global Technology Operations LLC
Most cited
By later US patents
- Electrochemical production of ozone and hydrogen peroxide465US 5,972,196 ALynntech, Inc. · 1999
- Remote power recharge for electronic equipment421US 7,068,991 B22006
- Remote charging system for a vehicle374US 5,982,139 A1999
- Method and apparatus for monitoring fuel cell performance359US 5,170,124 AMinister of National Defence of Her Majesty's Canadian Government · 1992
- Carbonate fuel cell system with thermally integrated gasification359US 5,554,453 AEnergy Research Corporation · 1996