G01R 27/18
Measuring resistance to earth , i.e. line to ground
Official title: Measuring resistance to earth {, i.e. line to ground}
G01R27/18 (Measuring resistance to earth , i.e. line to ground) appears on 350 US grants and 298 published applications in this corpus.
Search patents in G01R- Granted patents
- 350
- Published applications
- 298
- Assignees
- 256
- Inventors
- 688
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 6 | 0 |
| 1981 | 4 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 2 | 0 |
| 1987 | 5 | 0 |
| 1988 | 5 | 0 |
| 1989 | 8 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 3 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 4 |
| 2003 | 2 | 5 |
| 2004 | 7 | 3 |
| 2005 | 6 | 6 |
| 2006 | 7 | 2 |
| 2007 | 3 | 5 |
| 2008 | 2 | 7 |
| 2009 | 5 | 4 |
| 2010 | 3 | 3 |
| 2011 | 2 | 7 |
| 2012 | 4 | 11 |
| 2013 | 4 | 20 |
| 2014 | 15 | 17 |
| 2015 | 14 | 13 |
| 2016 | 14 | 13 |
| 2017 | 17 | 17 |
| 2018 | 18 | 15 |
| 2019 | 14 | 21 |
| 2020 | 24 | 22 |
| 2021 | 17 | 21 |
| 2022 | 21 | 21 |
| 2023 | 21 | 12 |
| 2024 | 17 | 22 |
| 2025 | 13 | 18 |
| 2026 | 9 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Circuit with switch for discharging capacitive elements connected to a safety-related digital input25 Aug 2026US 12,716,936 B2WAGO Verwaltungsgesellschaft mbH
- Vehicle ground connection diagnostic25 Aug 2026US 12,716,958 B2Aptiv Technologies AG
- System for protecting an electrical circuit for an aircraft25 Aug 2026US 12,716,959 B2Airbus Operations GmbH
- System and method for isolation resistance measurement26 May 2026US 12,638,486 B2Infineon Technologies Americas Corp.
- Method and device for insulation monitoring and insulation fault location for unearthed power supply networks26 May 2026US 12,638,488 B2ESA Elektroschaltanlagen Grimma GmbH
- Insulation monitoring device (imd), system for monitoring insulation and method for monitoring insulation of imd24 Sep 2026US 2026/0291216 A1Ls Electric Co., Ltd.
- Adapter and test meter for testing electric vehicle supply equipment3 Sep 2026US 2026/0259279 A1Megger Instruments Limited
- Apparatus and method for monitoring mobile grounding devices13 Aug 2026US 2026/0235652 A1Illinois Tool Works Inc.
- 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
- System for calibrating a line isolation monitor62US 5,446,682 ASquare D Company · 1995
- Cross-field ground fault sensor49US 4,021,729 AI-T-E Imperial Corporation · 1977
- Method of and apparatus for detecting ground faults in isolated power supply systems48US 4,206,398 AESB Incorporated · 1980
- Current rating verification system48US 4,316,187 A1982
- Dual channel dynamic line isolation monitor46US 3,976,987 ASquare D Company · 1976