G01V 3/28
Using induction coils
Official title: using induction coils
G01V3/28 (Using induction coils) appears on 1,023 US grants and 970 published applications in this corpus.
Search patents in G01V- Granted patents
- 1,023
- Published applications
- 970
- Assignees
- 159
- Inventors
- 995
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 3 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 5 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 9 | 0 |
| 1985 | 7 | 0 |
| 1986 | 7 | 0 |
| 1987 | 7 | 0 |
| 1988 | 10 | 0 |
| 1989 | 8 | 0 |
| 1990 | 7 | 0 |
| 1991 | 4 | 0 |
| 1992 | 9 | 0 |
| 1993 | 5 | 0 |
| 1994 | 6 | 0 |
| 1995 | 10 | 0 |
| 1996 | 3 | 0 |
| 1997 | 14 | 0 |
| 1998 | 10 | 0 |
| 1999 | 10 | 0 |
| 2000 | 10 | 0 |
| 2001 | 8 | 3 |
| 2002 | 18 | 15 |
| 2003 | 37 | 40 |
| 2004 | 22 | 29 |
| 2005 | 21 | 35 |
| 2006 | 23 | 26 |
| 2007 | 20 | 31 |
| 2008 | 22 | 33 |
| 2009 | 25 | 39 |
| 2010 | 25 | 48 |
| 2011 | 37 | 33 |
| 2012 | 28 | 28 |
| 2013 | 26 | 30 |
| 2014 | 29 | 45 |
| 2015 | 24 | 59 |
| 2016 | 38 | 90 |
| 2017 | 67 | 77 |
| 2018 | 67 | 74 |
| 2019 | 90 | 62 |
| 2020 | 60 | 42 |
| 2021 | 63 | 37 |
| 2022 | 37 | 17 |
| 2023 | 29 | 31 |
| 2024 | 20 | 14 |
| 2025 | 21 | 13 |
| 2026 | 14 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Neighboring resistivity anisotropy determination15 Sep 2026US 12,736,704 B2Halliburton Energy Services.Inc.
- Three-dimensional unwrapping processing method and system for borehole transient electromagnetic method23 Jun 2026US 12,663,557 B2Anhui Huizhou Geology Security Institute Co., Ltd
- Fracture determination ahead of the tool19 May 2026US 12,631,781 B2Halliburton Energy Services.Inc.
- Enhanced look ahead prediction19 May 2026US 12,631,782 B1Halliburton Energy Services.Inc.
- Processing of azimuthal electromagnetic pipe inspection data21 Apr 2026US 12,607,601 B2Halliburton Energy Services.Inc.
- Well integrity evaluation with eddy current diffusion time response1 Oct 2026US 2026/0299159 A1Schlumberger Technology Corporation
- Ground detection technology for pipe damage based on alternating electromagnetic excitation10 Sep 2026US 2026/0267027 A1Southwest Petroleum University
- System and method for calibrating through-casing electromagnetic instruments6 Aug 2026US 2026/0227545 A1China Petroleum & Chemical Corporation
- Downhole anisotropy inversion for look ahead detection during drilling30 Jul 2026US 2026/0219414 A1Halliburton Energy Services.Inc.
- Multiple pipes deformation detection using electromagnetic techniques23 Jul 2026US 2026/0211147 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Apparatus for locating an elongated conductive body by electromagnetic measurement while drilling248US 4,933,640 AVector Magnetics, Inc. · 1990
- Method for near field electromagnetic proximity determination for guidance of a borehole drill247US 5,923,170 AVector Magnetics, Inc. · 1999
- Logging while drilling apparatus with multiple depth of resistivity investigation244US 5,428,293 AHalliburton Logging Services, Inc. · 1995
- Drill stem logging with electromagnetic waves and electrostatically-shielded and inductively-coupled transmitter and receiver elements177US 4,785,247 ANL Industries, Inc. · 1988
- Electromagnetic wave resistivity tool having a tilted antenna for determining the horizontal and vertical resistivities and relative dip angle in anisotropic earth formations174US 6,163,155 ADresser Industries, Inc. · 2000