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H01M 8/04559

Of fuel cell stacks

Official title: {of fuel cell stacks}

H01M8/04559 (Of fuel cell stacks) appears on 968 US grants and 1,360 published applications in this corpus.

Search patents in H01M

Granted patents: 968
Published applications: 1,360
Assignees: 315
Inventors: 2,172
Latest grant: 6 Oct 2026

Filings by year

H01M 8/04559: granted patents and published applications per publication year
Year	Granted patents	Published applications
1978	1	0
1979	0	0
1980	0	0
1981	0	0
1982	0	0
1983	0	0
1984	0	0
1985	0	0
1986	0	0
1987	0	0
1988	1	0
1989	1	0
1990	0	0
1991	2	0
1992	2	0
1993	0	0
1994	1	0
1995	0	0
1996	0	0
1997	2	0
1998	3	0
1999	4	0
2000	2	0
2001	6	4
2002	7	35
2003	13	33
2004	21	50
2005	15	56
2006	20	89
2007	28	82
2008	26	76
2009	23	76
2010	52	93
2011	58	66
2012	62	68
2013	47	38
2014	63	48
2015	50	49
2016	50	56
2017	38	32
2018	47	52
2019	47	49
2020	51	43
2021	48	39
2022	35	45
2023	45	61
2024	29	44
2025	37	42
2026	31	34

By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.

Recent patents

Humidifier leak diagnosis system and method for a fuel cell system6 Oct 2026US 12,755,993 B2Hyundai Motor Company
Electrical energy supply system for mobile platforms and vehicle having an electrical energy supply system1 Sep 2026US 12,725,815 B2Airbus SAS
Assessing health of a fuel stack using fuel cell voltage diagnostics1 Sep 2026US 12,725,816 B2Hydrogenics Corporation
Voltage measuring device for measuring the voltage of a plurality of electrochemical cells of an electrochemical reactor11 Aug 2026US 12,706,318 B2Alstom HydrogèNe SAS
Cell-monitoring connector for fuel cell7 Jul 2026US 12,676,321 B2Hyundai Motor Company

Most cited

By later US patents