G01R 15/181
Using coils without a magnetic core
Official title: {using coils without a magnetic core, e.g. Rogowski coils}
G01R15/181 (Using coils without a magnetic core) appears on 521 US grants and 600 published applications in this corpus.
Search patents in G01R- Granted patents
- 521
- Published applications
- 600
- Assignees
- 302
- Inventors
- 1,183
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 4 | 0 |
| 2002 | 8 | 5 |
| 2003 | 6 | 7 |
| 2004 | 6 | 7 |
| 2005 | 5 | 5 |
| 2006 | 5 | 7 |
| 2007 | 9 | 13 |
| 2008 | 4 | 10 |
| 2009 | 12 | 12 |
| 2010 | 8 | 18 |
| 2011 | 8 | 14 |
| 2012 | 11 | 13 |
| 2013 | 8 | 23 |
| 2014 | 15 | 26 |
| 2015 | 12 | 28 |
| 2016 | 20 | 28 |
| 2017 | 36 | 41 |
| 2018 | 24 | 30 |
| 2019 | 36 | 28 |
| 2020 | 42 | 39 |
| 2021 | 35 | 33 |
| 2022 | 33 | 38 |
| 2023 | 36 | 49 |
| 2024 | 48 | 49 |
| 2025 | 34 | 50 |
| 2026 | 26 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for testing a lightning protection system and/or a lightning detection system of a wind turbine22 Sep 2026US 12,742,440 B2Siemens Gamesa Renewable Energy A/S
- Planar current sensor for power conversion applications22 Sep 2026US 12,742,798 B2Virginia Tech Intellectual Properties, Inc.
- Substrate-embedded AC sensors8 Sep 2026US 12,730,132 B2Allegro MicroSystems, LLC
- Accessory device for low-voltage switches8 Sep 2026US 12,731,716 B2ABB AB
- Photovoltaic inverter18 Aug 2026US 12,712,464 B2Delta Electronics, Inc.
- Current monitor combining a shunt resistor with a rogowski coil1 Oct 2026US 2026/0298983 A1Tektronix, Inc.
- Non-contact electrical parameter measurement device with radial dual mounted sensors1 Oct 2026US 2026/0298984 A1Fluke Corporation
- System and method for cancelling magnetic field1 Oct 2026US 2026/0304723 A1Safefields Technologies Ltd
- Current monitor combining a shunt resistor with a rogowski coil24 Sep 2026US 2026/0287619 A1Tektronix, Inc.
- Multipath circuit having enhanced frequency crossover performance17 Sep 2026US 2026/0276679 A1Allegro MicroSystems, LLC
Most cited
By later US patents
- Power management method and system222US 7,132,950 B22006
- Frequency selective arc detection117US 5,185,684 AEaton Corporation · 1993
- Power line sensors and systems incorporating same109US 7,174,261 B2Power Measurement Ltd. · 2007
- High precision rogowski coil98US 6,313,623 B1McGraw-Edison Company · 2001
- Rogowski coil71US 5,414,400 AGEC Alsthom T & D SA · 1995