H01M 4/248
Iron electrodes
Official title: {Iron electrodes}
H01M4/248 (Iron electrodes) appears on 61 US grants and 98 published applications in this corpus.
Search patents in H01M- Granted patents
- 61
- Published applications
- 98
- Assignees
- 32
- Inventors
- 168
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 2 |
| 2010 | 0 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 2 | 14 |
| 2015 | 0 | 15 |
| 2016 | 6 | 7 |
| 2017 | 3 | 8 |
| 2018 | 9 | 14 |
| 2019 | 12 | 3 |
| 2020 | 11 | 4 |
| 2021 | 2 | 5 |
| 2022 | 2 | 4 |
| 2023 | 2 | 8 |
| 2024 | 1 | 4 |
| 2025 | 4 | 6 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Negative electrode active material and battery4 Nov 2025US 12,463,214 B2Toyota Jidosha Kabushiki Kaisha
- Long life sealed alkaline secondary batteries8 Jul 2025US 12,355,042 B2Form Energy, Inc.
- Low cost metal electrodes6 May 2025US 12,294,086 B2Form Energy, Inc.
- Stack of electric batteries including series of fluidly connected unit cells25 Feb 2025US 12,237,548 B2Form Energy, Inc.
- Long life sealed alkaline secondary batteries26 Nov 2024US 12,155,047 B2Form Energy, Inc.
- Long life sealed alkaline secondary batteries7 May 2026US 2026/0128401 A1Form Energy, Inc.
- Iron powder, iron electrode, iron battery, and method of manufacture thereof10 Jul 2025US 2025/0226401 A1Form Energy, Inc.
- Low concentration additives for iron negative electrodes24 Apr 2025US 2025/0132320 A1Form Energy, Inc.
- Mitigating passivation of metal electrodes24 Apr 2025US 2025/0132387 A1Form Energy, Inc.
- Refuelable battery for the electric grid and method of using thereof10 Apr 2025US 2025/0118771 A1Form Energy, Inc.
Most cited
By later US patents
- Porous metal-containing materials, method of manufacture and products incorporating or made from the materials36US 6,410,160 B1Colorado School of Mines · 2002
- Additive for activating iron electrodes in alkaline batteries31US 4,250,236 AFirma Deutsche Automobilgesellschaft mbH · 1981
- Preparation of an alkaline iron electrode material using sulfur acids29US 3,947,292 AWestinghouse Electric Corp. · 1976
- Alkaline electrochemical cells with separator and electrolyte combination22US 8,920,969 B2The Gillette Company · 2014
- Layered iron electrode16US 9,368,788 B2Encell Technology, Inc. · 2016