G01R 31/389
Measuring internal impedance, internal conductance or related variables
G01R31/389 (Measuring internal impedance, internal conductance or related variables) appears on 1,628 US grants and 2,313 published applications in this corpus.
Search patents in G01R- Granted patents
- 1,628
- Published applications
- 2,313
- Assignees
- 734
- Inventors
- 4,121
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 3 | 0 |
| 1994 | 5 | 0 |
| 1995 | 5 | 0 |
| 1996 | 6 | 0 |
| 1997 | 8 | 0 |
| 1998 | 8 | 0 |
| 1999 | 7 | 0 |
| 2000 | 20 | 0 |
| 2001 | 19 | 8 |
| 2002 | 22 | 19 |
| 2003 | 15 | 22 |
| 2004 | 21 | 30 |
| 2005 | 15 | 21 |
| 2006 | 17 | 28 |
| 2007 | 11 | 21 |
| 2008 | 14 | 27 |
| 2009 | 21 | 28 |
| 2010 | 25 | 31 |
| 2011 | 27 | 35 |
| 2012 | 18 | 58 |
| 2013 | 31 | 58 |
| 2014 | 36 | 48 |
| 2015 | 44 | 84 |
| 2016 | 49 | 94 |
| 2017 | 59 | 87 |
| 2018 | 76 | 101 |
| 2019 | 110 | 136 |
| 2020 | 106 | 118 |
| 2021 | 128 | 145 |
| 2022 | 131 | 174 |
| 2023 | 130 | 213 |
| 2024 | 120 | 237 |
| 2025 | 159 | 252 |
| 2026 | 128 | 238 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Cell voltage estimation method and battery system providing the same6 Oct 2026US 12,754,241 B2LG Energy Solution, Ltd.
- Battery system diagnostics using electrochemical impedance spectroscopy6 Oct 2026US 12,754,247 B2Caterpillar Inc.
- Cross spectral impedance assessment for cell qualification6 Oct 2026US 12,754,248 B2Dynexus Technology, Inc.
- Method for predicting by artificial intelligence the remaining life of an electrochemical battery cell and associated devices6 Oct 2026US 12,754,251 B2Saft
- Stress-based comprehensive method and system for evaluating state of health of power battery, medium and device6 Oct 2026US 12,754,253 B2Shandong University
- Detection and remediation of liquid intrusion in vehicle battery packs8 Oct 2026US 2026/0307491 A1GM Global Technology Operations LLC
- Apparatus and method for measuring electrochemical impedance spectroscopy8 Oct 2026US 2026/0309659 A1SK On Co., Ltd.
- Peak hold device, impedance measurement device, metal deposition detection device, and battery internal temperature estimation device8 Oct 2026US 2026/0309755 A1Kabushiki Kaisha Toyota Chuo Kenkyusho
- Battery states co-estimation technique using dual square root unscented kalman filter8 Oct 2026US 2026/0309784 A1Smartkosh Technologies Private Limited
- Method and apparatus for diagnosing state of battery using neural network model8 Oct 2026US 2026/0309787 A1Samsung SDI.Co., Ltd.
Most cited
By later US patents
- Battery capacity estimating system and method1,065US 5,404,106 AFuji Jukogyo Kabushiki Kaisha · 1995
- Battery management apparatus for portable electronic devices323US 6,169,387 ALifecor, Inc. · 2001
- Battery condition monitor and monitoring method304US 4,678,998 ANissan Motor Co., Ltd. · 1987
- Apparatus and method for measuring battery condition276US 4,697,134 ACommonwealth Edison Company · 1987
- Battery monitoring apparatus and method for programmers of cardiac stimulating devices271US 6,108,579 APacesetter, Inc. · 2000