H01M 8/04791
Concentration
Official title: Concentration; Density (H01M8/04828 takes precedence)
H01M8/04791 (Concentration) appears on 351 US grants and 555 published applications in this corpus.
Search patents in H01M- Granted patents
- 351
- Published applications
- 555
- Assignees
- 213
- Inventors
- 1,116
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 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 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 2 | 4 |
| 2003 | 3 | 7 |
| 2004 | 2 | 7 |
| 2005 | 6 | 16 |
| 2006 | 1 | 25 |
| 2007 | 5 | 44 |
| 2008 | 2 | 25 |
| 2009 | 6 | 33 |
| 2010 | 18 | 16 |
| 2011 | 12 | 22 |
| 2012 | 22 | 24 |
| 2013 | 14 | 14 |
| 2014 | 17 | 53 |
| 2015 | 31 | 22 |
| 2016 | 22 | 25 |
| 2017 | 20 | 29 |
| 2018 | 18 | 14 |
| 2019 | 27 | 26 |
| 2020 | 21 | 24 |
| 2021 | 19 | 19 |
| 2022 | 20 | 19 |
| 2023 | 27 | 24 |
| 2024 | 10 | 20 |
| 2025 | 11 | 23 |
| 2026 | 6 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for estimating hydrogen concentration of fuel cell14 Jul 2026US 12,683,174 B2Hyundai Motor Company
- Gas detection system and gas detection method5 May 2026US 12,618,524 B2Nuvoton Technology Corporation Japan
- Apparatus for controlling operation of fuel cell system and method therefor21 Apr 2026US 12,609,338 B2Hyundai Motor Company
- High voltage-type redox flow battery comprising SOC balancing device21 Apr 2026US 12,609,339 B2H2, Inc.
- Solid oxide fuel cell assembly10 Mar 2026US 12,573,647 B2General Electric Company
- High-temperature fuel cell system and method of operating it1 Oct 2026US 2026/0302279 A1Cellcentric GmbH & Co. KG
- Method for starting a fuel cell system, and fuel cell system3 Sep 2026US 2026/0260913 A1Robert Bosch GmbH
- Fuel cell system20 Aug 2026US 2026/0245925 A1Aisin Corporation
- Electrochemical cell systems including particulate thermal storage material6 Aug 2026US 2026/0229563 A1Bloom Energy Corporation
- Fuel cell control system and method for adjusting operation in response to low purity hydrogen fuel6 Aug 2026US 2026/0229565 A1GM Global Technology Operations LLC
Most cited
By later US patents
- Fuel cell system controller115US 6,495,277 B1IdaTech, LLC · 2002
- Electrochemical load management system for transportation applications86US 5,346,778 AEnergy Partners, Inc. · 1994
- Fuel-cells generator system and method of generating electricity from fuel cells75US 5,925,476 AToyota Jidosha Kabushiki Kaisha · 1999
- Gas shortage preventive circuit for a fuel cell power generation system45US 5,624,768 AFuji Electric Co., Ltd. · 1997
- Fuel cell supply including information storage device and control system43US 8,227,121 B2Societe BIC · 2012