H01M 8/04949
Other electric variables
Official title: {other electric variables, e.g. resistance or impedance}
H01M8/04949 (Other electric variables) appears on 83 US grants and 108 published applications in this corpus.
Search patents in H01M- Granted patents
- 83
- Published applications
- 108
- Assignees
- 60
- Inventors
- 292
- Latest grant
- 16 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 3 |
| 2005 | 2 | 0 |
| 2006 | 1 | 6 |
| 2007 | 1 | 4 |
| 2008 | 1 | 4 |
| 2009 | 1 | 3 |
| 2010 | 2 | 5 |
| 2011 | 3 | 2 |
| 2012 | 1 | 5 |
| 2013 | 2 | 3 |
| 2014 | 3 | 7 |
| 2015 | 8 | 5 |
| 2016 | 7 | 5 |
| 2017 | 1 | 6 |
| 2018 | 4 | 9 |
| 2019 | 8 | 3 |
| 2020 | 7 | 4 |
| 2021 | 3 | 8 |
| 2022 | 6 | 6 |
| 2023 | 9 | 7 |
| 2024 | 5 | 3 |
| 2025 | 2 | 5 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Ionic conductivity measurement device and method for fuel cell16 Dec 2025US 12,500,257 B2Hyundai Motor Company
- Method for a frost start of a fuel cell device, fuel cell device and motor vehicle having a fuel cell device4 Nov 2025US 12,463,228 B2Audi AG
- System and method for indirectly monitoring an isolation resistance of one or more fuel cells10 Dec 2024US 12,166,250 B2Toyota Motor Engineering & Manufacturing North America, Inc.
- Device for diagnosing valve failure of fuel cell system30 Jul 2024US 12,051,834 B2Hyundai Motor Company
- Aircraft fuel cell system without the use of a buffer battery26 Mar 2024US 11,942,668 B2ZeroAvia, Inc.
- Voltage detection system23 Jul 2026US 2026/0211009 A1Toyota Jidosha Kabushiki Kaisha
- Ionic conductivity measurement device and method for fuel cell4 Jun 2026US 2026/0155415 A1Hyundai Motor Company
- Fuel cell vehicle and method of controlling the same9 Apr 2026US 2026/0100389 A1Hyundai Motor Company
- Fuel cell module4 Dec 2025US 2025/0372681 A1Kabushiki Kaisha Toyota Jidoshokki
- Control system for controlling a fuel cell system16 Oct 2025US 2025/0323296 A1Powercell Sweden AB
Most cited
By later US patents
- Generator system utilizing a fuel cell62US 4,839,574 AFuji Electric Co., Ltd. · 1989
- Vehicle having a fuel cell or battery energy supply network53US 5,760,488 ADaimler-Benz Aktiengesellschaft · 1998
- Fuel cells incorporating nanotubes in fuel feed50US 6,589,682 B12003
- Sensor cell for an electrochemical fuel cell stack15US 6,673,480 B1Ballard Power Systems Inc. · 2004
- Cell discharging circuit for a fuel cell9US 5,105,142 AFuji Electric Co., Ltd. · 1992