G01R 27/025
Measuring very high resistances
Official title: {Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters}
G01R27/025 (Measuring very high resistances) appears on 317 US grants and 365 published applications in this corpus.
Search patents in G01R- Granted patents
- 317
- Published applications
- 365
- Assignees
- 204
- Inventors
- 735
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 4 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 2 | 0 |
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| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 1 | 1 |
| 2003 | 3 | 3 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 3 |
| 2009 | 2 | 8 |
| 2010 | 1 | 2 |
| 2011 | 3 | 7 |
| 2012 | 2 | 6 |
| 2013 | 6 | 6 |
| 2014 | 6 | 10 |
| 2015 | 9 | 15 |
| 2016 | 4 | 17 |
| 2017 | 20 | 17 |
| 2018 | 18 | 16 |
| 2019 | 18 | 30 |
| 2020 | 29 | 26 |
| 2021 | 32 | 23 |
| 2022 | 21 | 37 |
| 2023 | 23 | 42 |
| 2024 | 29 | 32 |
| 2025 | 42 | 42 |
| 2026 | 12 | 20 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Power conversion system and control method therefor29 Sep 2026US 12,748,139 B2Zhejiang Jinko Energy Storage Co., Ltd.
- Integrated active isolation measurement22 Sep 2026US 12,742,804 B2Infineon Technologies AG
- Method for insulation monitoring and insulation monitoring device with network balancing in an ungrounded direct voltage system22 Sep 2026US 12,742,805 B2Bender GmbH & Co. KG
- Vehicle electrical system having a high-voltage branch, a low-voltage branch, and low-voltage-side insulation fault detection1 Sep 2026US 12,722,498 B2Vitesco Technologies GmbH
- Battery apparatus and battery management system for measuring insulation resistance11 Aug 2026US 12,704,539 B2LG Energy Solution, Ltd.
- System and method for isolation resistance measurement10 Sep 2026US 2026/0266881 A1Infineon Technologies Americas Corp.
- Device System and Method for Measuring an Electrical Parameter of a Battery Cell13 Aug 2026US 2026/0237764 A1LG Energy Solution, Ltd.
- Method, controller and system for handling isolation faults in battery operated system6 Aug 2026US 2026/0225455 A1Scania CV AB
- Insulation monitoring system comprising multiple insulation monitoring devices, and a method for controlling insulation monitoring devices constituting same system6 Aug 2026US 2026/0227436 A1Ls Electric Co., Ltd.
- Resistance measurement device23 Jul 2026US 2026/0211025 A1LG Innotek Co., Ltd.
Most cited
By later US patents
- Surface resistivimeter75US 4,446,424 AOffice National D’Etudes Et De Recherches AéRospatiales · 1984
- Bus leakage resistance estimation for electrical isolation testing and diagnostics36US 9,758,044 B2Ford Global Technologies, LLC · 2017
- Leakage impedance measuring system including a superimposed measuring voltage having a frequency differing slightly from system frequency31US 4,472,676 AW. Bender GmbH & Co. · 1984
- Apparatus for measuring insulation resistance in an operating three-phase ungrounded transmission line system27US 4,200,836 AFuji Electric Co., Ltd. · 1980
- Resonant phase sensing of resistive-inductive-capacitive sensors19US 10,908,200 B2Cirrus Logic, Inc. · 2021