H01M 8/04664
Failure or abnormal function
H01M8/04664 (Failure or abnormal function) appears on 834 US grants and 1,219 published applications in this corpus.
Search patents in H01M- Granted patents
- 834
- Published applications
- 1,219
- Assignees
- 297
- Inventors
- 2,114
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 1 |
| 2002 | 6 | 15 |
| 2003 | 5 | 19 |
| 2004 | 15 | 24 |
| 2005 | 9 | 30 |
| 2006 | 11 | 50 |
| 2007 | 10 | 42 |
| 2008 | 19 | 49 |
| 2009 | 14 | 45 |
| 2010 | 26 | 57 |
| 2011 | 35 | 39 |
| 2012 | 34 | 43 |
| 2013 | 32 | 37 |
| 2014 | 35 | 51 |
| 2015 | 46 | 52 |
| 2016 | 40 | 54 |
| 2017 | 33 | 42 |
| 2018 | 43 | 61 |
| 2019 | 49 | 64 |
| 2020 | 57 | 56 |
| 2021 | 60 | 71 |
| 2022 | 59 | 70 |
| 2023 | 72 | 70 |
| 2024 | 33 | 64 |
| 2025 | 43 | 65 |
| 2026 | 32 | 48 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Humidifier leak diagnosis system and method for a fuel cell system6 Oct 2026US 12,755,993 B2Hyundai Motor Company
- Fuel cell system29 Sep 2026US 12,749,693 B2Toyota Jidosha Kabushiki Kaisha
- Hydrogen leak sensing device and method for fuel cell vehicle29 Sep 2026US 12,749,695 B2Hyundai Motor Company
- Method of controlling a cooling fan for a fuel cell stack8 Sep 2026US 12,731,802 B2Hyundai Motor Company
- Assessing health of a fuel stack using fuel cell voltage diagnostics1 Sep 2026US 12,725,816 B2Hydrogenics Corporation
- Swelling reduction system1 Oct 2026US 2026/0302291 A1Subaru Corporation
- Fuel cell control system24 Sep 2026US 2026/0290862 A1Honda Motor Co., Ltd.
- Sensor apparatus and method24 Sep 2026US 2026/0290864 A1National Research Council of Canada
- Systems and methods for monitoring a fuel cell24 Sep 2026US 2026/0290865 A1Hyster-Yale Materials Handling, Inc.
- Control method for fuel cell system17 Sep 2026US 2026/0279861 A1Kabushiki Kaisha Toyota Chuo Kenkyusho
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
- Automatic voltage imbalance detector205US 4,424,491 AThe United States of America as represented by the United States Department of Energy · 1984
- PEM fuel cell monitoring system167US 5,763,113 AGeneral Motors Corporation · 1998
- Fuel cell system controller115US 6,495,277 B1IdaTech, LLC · 2002
- Fuel cell and method for controlling same103US 6,096,449 AAvista Labs · 2000