H01M 8/0438
Pressure
Official title: Pressure; Ambient pressure; Flow
H01M8/0438 (Pressure) appears on 1,448 US grants and 2,166 published applications in this corpus.
Search patents in H01M- Granted patents
- 1,448
- Published applications
- 2,166
- Assignees
- 450
- Inventors
- 3,083
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 6 | 4 |
| 2002 | 4 | 32 |
| 2003 | 8 | 28 |
| 2004 | 20 | 66 |
| 2005 | 27 | 75 |
| 2006 | 20 | 68 |
| 2007 | 26 | 81 |
| 2008 | 23 | 81 |
| 2009 | 28 | 92 |
| 2010 | 45 | 122 |
| 2011 | 57 | 89 |
| 2012 | 82 | 83 |
| 2013 | 80 | 65 |
| 2014 | 76 | 85 |
| 2015 | 79 | 80 |
| 2016 | 58 | 94 |
| 2017 | 75 | 79 |
| 2018 | 76 | 85 |
| 2019 | 78 | 118 |
| 2020 | 85 | 95 |
| 2021 | 105 | 84 |
| 2022 | 100 | 100 |
| 2023 | 103 | 137 |
| 2024 | 52 | 108 |
| 2025 | 62 | 119 |
| 2026 | 54 | 96 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01M 8/04388Of anode reactants at the inlet or inside the fuel cell655
- H01M 8/04395Of cathode reactants at the inlet or inside the fuel cell474
- H01M 8/04425At auxiliary devices292
- H01M 8/04402Of anode exhausts153
- H01M 8/04432Pressure differences121
- H01M 8/0441Of cathode exhausts109
- H01M 8/04417Of the coolant88
Recent patents
- Fuel cell vehicle with differential pressure flow meter for humidity measurement6 Oct 2026US 12,752,667 B2Ford Global Technologies, LLC
- Humidifier leak diagnosis system and method for a fuel cell system6 Oct 2026US 12,755,993 B2Hyundai Motor Company
- Method and system for estimating flight time of a hydrogen fuel cell UAV29 Sep 2026US 12,746,825 B2Industrial Technology Research Institute
- Electric energy managing system and method thereof29 Sep 2026US 12,746,853 B2Industrial Technology Research Institute
- Fuel cell system29 Sep 2026US 12,749,693 B2Toyota Jidosha Kabushiki Kaisha
- Fuel cell system and purging method for inerting a fuel cell system8 Oct 2026US 2026/0312091 A1
- Conditioning method and conditioning device8 Oct 2026US 2026/0312092 A1Robert Bosch GmbH
- Detection method for detecting a state of a fuel cell system8 Oct 2026US 2026/0312095 A1
- Ai driven vfd control for securing membrane in flow batteries8 Oct 2026US 2026/0312097 A1ViZn Energy Systems, Inc.
- High-temperature fuel cell system and method of operating it1 Oct 2026US 2026/0302279 A1Cellcentric GmbH & Co. KG
Most cited
By later US patents
- Hydrocarbon fueled solid polymer fuel cell electric power generation system168US 5,360,679 ABallard Power Systems Inc. · 1994
- Fuel cell power generation system138US 5,658,681 AAisin Aw Co., Ltd. · 1997
- Method and system for controlling output of fuel cell power generator135US 5,637,414 AFuji Electric Co., Ltd. · 1997
- Fuel cell generator and method of the same123US 5,677,073 AToyota Jidosha Kabushiki Kaisha · 1997
- Fuel cell system controller115US 6,495,277 B1IdaTech, LLC · 2002