C25B 9/21
Two or more diaphragms
Official title: two or more diaphragms
C25B9/21 (Two or more diaphragms) appears on 100 US grants and 166 published applications in this corpus.
Search patents in C25B- Granted patents
- 100
- Published applications
- 166
- Assignees
- 106
- Inventors
- 375
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 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 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 3 |
| 2013 | 0 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 1 |
| 2016 | 2 | 4 |
| 2017 | 1 | 1 |
| 2018 | 3 | 1 |
| 2019 | 1 | 4 |
| 2020 | 2 | 6 |
| 2021 | 2 | 14 |
| 2022 | 8 | 19 |
| 2023 | 18 | 24 |
| 2024 | 16 | 40 |
| 2025 | 20 | 32 |
| 2026 | 12 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Pump free alkaline electrolyte membrane water electrolytic device25 Aug 2026US 12,716,135 B2The United States of America as represented by the Secretary of the Army
- Electrochemical conversion of carbon dioxide to form an organic acid18 Aug 2026US 12,709,811 B2Uop LLC
- Cell concept for using non-ionically conductive extraction media28 Jul 2026US 12,692,605 B2Siemens Energy Global GmbH & Co. KG
- Method for producing alkali metal alcoholates in an electrolysis cell30 Jun 2026US 12,668,885 B2Evonik Operations GmbH
- Water electrolysis device and method of controlling water electrolysis device16 Jun 2026US 12,655,527 B2Kabushilki Kaisha Toshiba
- Direct air capture of carbon dioxide17 Sep 2026US 2026/0273467 A1Carbon Utility LLC
- Electrolysis system having an ion exchanger10 Sep 2026US 2026/0265924 A1Siemens Energy Global GmbH & Co. KG
- Operating an electrochemical cell in the context of processing lithium-containing water3 Sep 2026US 2026/0258563 A1Evonik Operations GmbH
- Process for producing a carbon product and carbon fibers through a carbon neutral or carbon negative process13 Aug 2026US 2026/0233165 A1Carbon Utility LLC
- Electrochemical carbon dioxide reduction to formic acid30 Jul 2026US 2026/0218392 A1Oxylum B.V.
Most cited
By later US patents
- Chemical reactor system68US 6,942,767 B1T-Graphic, LLC · 2005
- Processes and systems for preparing lithium carbonate31US 10,144,990 B2Nemaska Lithium Inc. · 2018
- Electrochemical cell for processing organic wastes29US 5,756,874 AEosystems, Inc. · 1998
- Reverse electrodialysis supported microbial fuel cells and microbial electrolysis cells26US 9,112,217 B2The Penn State University · 2015
- Coating metal anodes to decrease consumption rates24US 4,100,050 AHooker Chemicals & Plastics Corporation · 1978