E21B 47/0228
Using electromagnetic energy or detectors therefor
Official title: using electromagnetic energy or detectors therefor
E21B47/0228 (Using electromagnetic energy or detectors therefor) appears on 669 US grants and 617 published applications in this corpus.
Search patents in E21B- Granted patents
- 669
- Published applications
- 617
- Assignees
- 146
- Inventors
- 777
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 9 | 0 |
| 1990 | 7 | 0 |
| 1991 | 6 | 0 |
| 1992 | 6 | 0 |
| 1993 | 6 | 0 |
| 1994 | 5 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 6 | 0 |
| 1998 | 6 | 0 |
| 1999 | 15 | 0 |
| 2000 | 9 | 0 |
| 2001 | 12 | 4 |
| 2002 | 11 | 12 |
| 2003 | 15 | 17 |
| 2004 | 9 | 15 |
| 2005 | 16 | 18 |
| 2006 | 13 | 13 |
| 2007 | 10 | 10 |
| 2008 | 11 | 27 |
| 2009 | 15 | 27 |
| 2010 | 28 | 15 |
| 2011 | 16 | 19 |
| 2012 | 9 | 18 |
| 2013 | 12 | 17 |
| 2014 | 15 | 30 |
| 2015 | 20 | 30 |
| 2016 | 24 | 51 |
| 2017 | 28 | 43 |
| 2018 | 36 | 43 |
| 2019 | 62 | 30 |
| 2020 | 40 | 32 |
| 2021 | 39 | 38 |
| 2022 | 28 | 28 |
| 2023 | 37 | 21 |
| 2024 | 23 | 21 |
| 2025 | 26 | 21 |
| 2026 | 11 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Interference compensated cross-axial magnetometer measurements22 Sep 2026US 12,742,380 B2Schlumberger Technology Corporation
- Borehole correction for resistivity LWD tools with ultrasonic log while drilling caliper25 Aug 2026US 12,716,344 B2Halliburton Energy Services.Inc.
- Wellbore surveying using a tilted survey sensor11 Aug 2026US 12,704,059 B2Schlumberger Technology Corporation
- Antenna array for tracking an object28 Jul 2026US 12,692,780 B2Grant Prideco, L.P.
- Fretting-wear resistant beacon lid30 Jun 2026US 12,669,050 B2The Charles Machine Works, Inc.
- Fretting-wear resistant beacon lid1 Oct 2026US 2026/0298076 A1The Charles Machine Works, Inc.
- Beacon feedback for isolation of carrier signal27 Aug 2026US 2026/0254106 A1The Charles Machine Works, Inc.
- Downhole tubular inspection using partial-saturation eddy currents30 Jul 2026US 2026/0218601 A1Halliburton Energy Services.Inc.
- Horizontal Directional Drilling Guidence System23 Jul 2026US 2026/0210187 A1
- Downhole tool string movement sensor system23 Jul 2026US 2026/0210233 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Method and apparatus employing received independent magnetic field components of a transmitted alternating magnetic field for determining location494US 4,710,708 ADevelco, Inc. · 1987
- Downhole combination tool358US 5,064,006 AMagrange, Inc · 1991
- Method for drilling a borehole from one cased borehole to another cased borehole312US 5,541,517 AShell Oil Company · 1996
- Rotating magnet for distance and direction measurements from a first borehole to a second borehole292US 5,589,775 AVector Magnetics, Inc. · 1996
- Surveying system and method for locating target subterranean bodies271US 5,103,920 APatton Consulting, Inc. · 1992