G01R 27/20
Measuring earth resistance
Official title: Measuring earth resistance; Measuring contact resistance, {e.g.} of earth connections, e.g. plates
G01R27/20 (Measuring earth resistance) appears on 257 US grants and 223 published applications in this corpus.
Search patents in G01R- Granted patents
- 257
- Published applications
- 223
- Assignees
- 222
- Inventors
- 613
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 5 | 0 |
| 1978 | 2 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 6 | 0 |
| 1988 | 5 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 6 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 3 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 5 | 0 |
| 2001 | 6 | 1 |
| 2002 | 3 | 1 |
| 2003 | 3 | 1 |
| 2004 | 4 | 6 |
| 2005 | 3 | 4 |
| 2006 | 11 | 7 |
| 2007 | 1 | 6 |
| 2008 | 2 | 6 |
| 2009 | 4 | 7 |
| 2010 | 6 | 7 |
| 2011 | 3 | 5 |
| 2012 | 5 | 4 |
| 2013 | 5 | 12 |
| 2014 | 4 | 11 |
| 2015 | 6 | 13 |
| 2016 | 15 | 6 |
| 2017 | 10 | 8 |
| 2018 | 13 | 10 |
| 2019 | 4 | 15 |
| 2020 | 14 | 15 |
| 2021 | 12 | 18 |
| 2022 | 19 | 8 |
| 2023 | 11 | 10 |
| 2024 | 6 | 16 |
| 2025 | 6 | 18 |
| 2026 | 6 | 8 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Automated electrical connector wear monitoring25 Aug 2026US 12,716,925 B2International Business Machines Corporation
- Electronic apparatus for performing a connection resistance test26 May 2026US 12,642,113 B2Samsung Display Co., Ltd.
- Apparatus, system and method of monitoring joints and switch conditions in an electrical network19 May 2026US 12,631,698 B2Eaton Intelligent Power Limited
- Method and system for a pilot directional protection of LCC-HVDC lines based on virtual grounding resistance7 Apr 2026US 12,596,144 B2North China Electric Power University
- Remote calculation of earth connection impedance17 Mar 2026US 12,578,371 B2Viper Innovations Limited
- Detection circuit and detection method24 Sep 2026US 2026/0287628 A1Novatek Microelectronics Corp.
- Apparatus and method for monitoring mobile grounding devices13 Aug 2026US 2026/0235652 A1Illinois Tool Works Inc.
- Contact Resistance Abnormality Diagnosis Method and Contact Resistance Abnormality Diagnosis System30 Jul 2026US 2026/0217128 A1LG Energy Solution, Ltd.
- Low-amplitude direct lightning hazard assessment and warning method for distribution network16 Jul 2026US 2026/0202452 A1Kunming University of Science and Technology
- Testing Method and Testing Loop for Contact Resistance2 Jul 2026US 2026/0186036 A1Yunnan Power Grid Co., Ltd. Lijiang Power Supply Bureau
Most cited
By later US patents
- Process for remote grounding, transmission sensing, and temperature monitoring device228US 8,160,825 B12012
- Apparatus and method for electrical system measurements including battery condition, resistance of wires and connections, total electrical system quality and current flow139US 5,721,688 AMadill Technologies, Inc. · 1998
- Apparatus and method for detecting electrical resistance change in connectors to a remote mounted sensor91US 6,198,295 B1Honeywell Inc. · 2001
- Non-invasive, high resolution detection of electrical currents and electrochemical impedances at spaced localities along a pipeline83US 5,126,654 AColumbia Gas System Service Corporation · 1992
- Vehicle starting battery cold-cranking AMPS meter and method82US 6,097,193 AMadill Technologies, Inc. · 2000