H01M 8/04225
During start-up
Official title: during start-up
H01M8/04225 (During start-up) appears on 897 US grants and 1,234 published applications in this corpus.
Search patents in H01M- Granted patents
- 897
- Published applications
- 1,234
- Assignees
- 282
- Inventors
- 2,174
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 8 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 5 | 0 |
| 1998 | 4 | 0 |
| 1999 | 7 | 0 |
| 2000 | 8 | 0 |
| 2001 | 12 | 14 |
| 2002 | 14 | 41 |
| 2003 | 21 | 68 |
| 2004 | 32 | 56 |
| 2005 | 29 | 68 |
| 2006 | 30 | 51 |
| 2007 | 23 | 41 |
| 2008 | 22 | 56 |
| 2009 | 27 | 65 |
| 2010 | 41 | 93 |
| 2011 | 47 | 60 |
| 2012 | 46 | 39 |
| 2013 | 43 | 49 |
| 2014 | 48 | 38 |
| 2015 | 51 | 42 |
| 2016 | 32 | 43 |
| 2017 | 38 | 32 |
| 2018 | 36 | 34 |
| 2019 | 29 | 34 |
| 2020 | 29 | 40 |
| 2021 | 30 | 55 |
| 2022 | 56 | 35 |
| 2023 | 41 | 60 |
| 2024 | 22 | 38 |
| 2025 | 34 | 52 |
| 2026 | 12 | 30 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Fuel cell system and method for stopping power generation in fuel cell system15 Sep 2026US 12,738,515 B2Honda Motor Co., Ltd.
- Method of accelerating activation of fuel cell8 Sep 2026US 12,731,801 B2Hyundai Motor Company
- System for protecting a fuel cell from cold temperatures21 Jul 2026US 12,689,046 B2Ford Global Technologies, LLC
- Predictive freeze preparation scheduling for fuel cell propulsion system7 Jul 2026US 12,676,326 B2Ford Global Technologies, LLC
- Fuel cell start control system and control method therefor16 Jun 2026US 12,658,458 B2Hyundai Motor Company
- Managing a fuel cell system in a fuel cell vehicle8 Oct 2026US 2026/0312087 A1Volvo Truck Corporation
- Fuel cell system and control method therefor8 Oct 2026US 2026/0312102 A1Nissan Motor Co., Ltd.
- Solid polymer fuel battery activation method1 Oct 2026US 2026/0302285 A1Honda Motor Co., Ltd.
- Solid polymer fuel battery activation method1 Oct 2026US 2026/0302286 A1Honda Motor Co., Ltd.
- Fuel cell activation device1 Oct 2026US 2026/0302287 A1Honda Motor Co., Ltd.
Most cited
By later US patents
- Fuel cell system with combustor-heated reformer172US 6,077,620 AGeneral Motors Corporation · 2000
- Miniature ceramic fuel cell154US 5,641,585 ALockheed Idaho Technologies Company · 1997
- Hydrocarbon fuelled fuel cell power system131US 5,527,632 ARolls-Royce and Associates Limited · 1996
- Hybrid electrical power system114US 5,968,680 AAlliedSignal Inc. · 1999
- Energy supply unit on board an aircraft113US 6,296,957 B1Xcellsis GmbH · 2001