C25B 13/04
Diaphragms: characterised by the material
Official title: characterised by the material
C25B13/04 (Diaphragms: characterised by the material) appears on 806 US grants and 1,374 published applications in this corpus.
Search patents in C25B- Granted patents
- 806
- Published applications
- 1,374
- Assignees
- 603
- Inventors
- 2,986
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 10 | 0 |
| 1978 | 19 | 0 |
| 1979 | 22 | 0 |
| 1980 | 24 | 0 |
| 1981 | 14 | 0 |
| 1982 | 11 | 0 |
| 1983 | 9 | 0 |
| 1984 | 17 | 0 |
| 1985 | 12 | 0 |
| 1986 | 7 | 0 |
| 1987 | 11 | 0 |
| 1988 | 5 | 0 |
| 1989 | 8 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 9 | 0 |
| 1994 | 4 | 0 |
| 1995 | 4 | 0 |
| 1996 | 6 | 0 |
| 1997 | 8 | 0 |
| 1998 | 4 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 1 |
| 2002 | 5 | 6 |
| 2003 | 3 | 10 |
| 2004 | 2 | 10 |
| 2005 | 1 | 7 |
| 2006 | 5 | 11 |
| 2007 | 3 | 11 |
| 2008 | 7 | 10 |
| 2009 | 4 | 19 |
| 2010 | 4 | 8 |
| 2011 | 12 | 9 |
| 2012 | 8 | 14 |
| 2013 | 7 | 20 |
| 2014 | 17 | 38 |
| 2015 | 18 | 30 |
| 2016 | 20 | 53 |
| 2017 | 28 | 59 |
| 2018 | 27 | 36 |
| 2019 | 46 | 57 |
| 2020 | 31 | 72 |
| 2021 | 38 | 67 |
| 2022 | 39 | 103 |
| 2023 | 53 | 125 |
| 2024 | 57 | 198 |
| 2025 | 77 | 219 |
| 2026 | 54 | 181 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electrochemical co-production of hydrogen and carbon monoxide6 Oct 2026US 12,753,519 B2Utility Global, Inc.
- Membrane electrode assembly for PEM water electrolysis capable of improving the electrical conductivity of the electrode layer and method of manufacturing thereof6 Oct 2026US 12,753,520 B2Korea Institute of Energy Research
- Water electrolysis cell and manufacturing method of the same22 Sep 2026US 12,742,244 B2Toyota Jidosha Kabushiki Kaisha
- Hydrophilic member with cation and anion conducting membranes22 Sep 2026US 12,742,247 B2Ohmium International, Inc.
- Multilayer reinforced composite electrolyte membrane and method for manufacturing same15 Sep 2026US 12,735,796 B2Korea Institute of Science and Technology
- Polymerizable composition, ion exchange resin, ion exchange membrane, membrane electrode assembly, and hydrogen production device8 Oct 2026US 2026/0308295 A1Tokuyama Corporation
- Additives for improved electrolyzer durability8 Oct 2026US 2026/0308776 A1The Lubrizol Corporation
- Additives for improved electrolyzer durability8 Oct 2026US 2026/0308791 A1The Lubrizol Corporation
- Electro-synthetic or electro-energy cell, system, and method of operation8 Oct 2026US 2026/0312090 A1Hysata Pty Ltd
- Electrode, solid oxide cell including the same, and method of preparing solid oxide cell1 Oct 2026US 2026/0296913 A1Samsung Electro-Mechanics Co., Ltd.
Most cited
By later US patents
- Ionic semiconductor materials and applications thereof795US 5,055,171 AT and G Corporation · 1991
- Ultra-thin integral composite membrane242US 5,547,551 AW. L. Gore & Associates, Inc. · 1996
- Method of making polytetrafluoroethylene composite sheet203US 4,153,661 AMinnesota Mining and Manufacturing Company · 1979
- Electrolytic cell with composite, porous diaphragm164US 5,183,545 A1993
- Integral composite membrane150US 5,599,614 AW. L. Gore & Associates, Inc. · 1997