H01M 8/18
Regenerative fuel cells
Official title: Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
H01M8/18 (Regenerative fuel cells) appears on 1,888 US grants and 2,864 published applications in this corpus.
Search patents in H01M- Granted patents
- 1,888
- Published applications
- 2,864
- Assignees
- 978
- Inventors
- 4,516
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 9 | 0 |
| 1978 | 5 | 0 |
| 1979 | 6 | 0 |
| 1980 | 5 | 0 |
| 1981 | 5 | 0 |
| 1982 | 8 | 0 |
| 1983 | 5 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 8 | 0 |
| 1989 | 13 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 4 | 0 |
| 1993 | 10 | 0 |
| 1994 | 12 | 0 |
| 1995 | 8 | 0 |
| 1996 | 7 | 0 |
| 1997 | 10 | 0 |
| 1998 | 10 | 0 |
| 1999 | 9 | 0 |
| 2000 | 4 | 0 |
| 2001 | 14 | 10 |
| 2002 | 21 | 27 |
| 2003 | 27 | 41 |
| 2004 | 22 | 49 |
| 2005 | 17 | 38 |
| 2006 | 16 | 35 |
| 2007 | 21 | 26 |
| 2008 | 20 | 48 |
| 2009 | 22 | 54 |
| 2010 | 25 | 44 |
| 2011 | 30 | 60 |
| 2012 | 25 | 73 |
| 2013 | 46 | 94 |
| 2014 | 51 | 130 |
| 2015 | 69 | 131 |
| 2016 | 69 | 168 |
| 2017 | 103 | 156 |
| 2018 | 126 | 206 |
| 2019 | 145 | 201 |
| 2020 | 167 | 177 |
| 2021 | 128 | 162 |
| 2022 | 141 | 170 |
| 2023 | 140 | 224 |
| 2024 | 112 | 244 |
| 2025 | 89 | 167 |
| 2026 | 80 | 129 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Non-aqueous redox flow batteries6 Oct 2026US 12,755,995 B2ENI S. p. A.
- Salinity gradient power generation device comprising electrodes of an activated carbon fabric15 Sep 2026US 12,738,523 B2Sweetch Energy
- Electrolyte regeneration for organic redox flow batteries based on water-soluble phenazine-based compounds8 Sep 2026US 12,731,806 B2CMBlu Energy AG
- Electrolyte regeneration for redox flow batteries based on ferrocyanide and/or ferricyanide salts8 Sep 2026US 12,731,807 B2CMBlu Energy AG
- Acoustically controlled rheological valve for thixotropic fluid flow control1 Sep 2026US 12,725,823 B1
- Carbon dioxide adsorption battery, charge/discharge device, and carbon dioxide concentration device8 Oct 2026US 2026/0307004 A1Kuraray Co., Ltd.
- Thin-film composite membranes for electrochemical systems8 Oct 2026US 2026/0312083 A1Massachusetts Institute of Technology
- Ai driven vfd control for securing membrane in flow batteries8 Oct 2026US 2026/0312097 A1ViZn Energy Systems, Inc.
- Ai low-voltage fuel cell power system1 Oct 2026US 2026/0299654 A1
- High-performance, durable, and self-regenerating zinc-based flow battery1 Oct 2026US 2026/0302298 A1City University of Hong Kong
Most cited
By later US patents
- Ionic semiconductor materials and applications thereof795US 5,055,171 AT and G Corporation · 1991
- Electrochemical production of ozone and hydrogen peroxide465US 5,972,196 ALynntech, Inc. · 1999
- High energy density redox flow device172US 8,722,226 B224M Technologies, Inc. · 2014
- Electrically rechargeable anionically active reduction-oxidation electrical storage-supply system147US 4,485,154 AInstitute of Gas Technology · 1984
- Recycling of carbon dioxide into methyl alcohol and related oxygenates for hydrocarbons143US 5,928,806 A1999