E21B 47/125
Using earth as an electrical conductor
Official title: using earth as an electrical conductor (by electromagnetic energy E21B47/13)
E21B47/125 (Using earth as an electrical conductor) appears on 120 US grants and 111 published applications in this corpus.
Search patents in E21B- Granted patents
- 120
- Published applications
- 111
- Assignees
- 48
- Inventors
- 254
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 3 |
| 2003 | 2 | 0 |
| 2004 | 5 | 1 |
| 2005 | 0 | 0 |
| 2006 | 3 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 0 | 4 |
| 2010 | 1 | 5 |
| 2011 | 2 | 4 |
| 2012 | 3 | 0 |
| 2013 | 3 | 4 |
| 2014 | 4 | 10 |
| 2015 | 2 | 5 |
| 2016 | 4 | 10 |
| 2017 | 10 | 8 |
| 2018 | 10 | 12 |
| 2019 | 15 | 12 |
| 2020 | 11 | 3 |
| 2021 | 7 | 7 |
| 2022 | 5 | 8 |
| 2023 | 4 | 4 |
| 2024 | 8 | 5 |
| 2025 | 4 | 1 |
| 2026 | 3 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Apparatus and method for contacting an open hole surface12 May 2026US 12,624,636 B2Expro North Sea Limited
- Advanced drill string communication system, components and methods17 Feb 2026US 12,553,336 B2Merlin Technology, Inc.
- Wireless system for monitoring downhole parameters13 Jan 2026US 12,523,146 B2Tri-Logic Limited Liability Company
- Advanced inground device power control and associated methods7 Oct 2025US 12,435,571 B2Merlin Technology, Inc.
- Wellbore downlink communication11 Mar 2025US 12,247,482 B2Halliburton Energy Services.Inc.
- Subterranean communications system and method17 Sep 2026US 2026/0280726 A1CMTE Development Limited
- Systems, methods and apparatus for downhole monitoring of production conditions using em telemetry30 Apr 2026US 2026/0117647 A1Geo Psi Pty Ltd
- Wireless system for monitoring downhole parameters16 Jan 2025US 2025/0020056 A1Tri-Logic Limited Liability Company
- Wire mesh for completion tools3 Oct 2024US 2024/0328310 A1Halliburton Energy Services.Inc.
- Wellbore downlink communication19 Sep 2024US 2024/0309755 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Systems and methods for electromagnetic waterfront surveillance in a vicinity of an oil well347US 11,035,972 B2Saudi Arabian Oil Company · 2021
- Method and apparatus for transmitting information between equipment at the bottom of a drilling or production operation and the surface113US 5,394,141 AGeoservices · 1995
- Casing conveyed perforating process and apparatus72US 6,386,288 B1Marathon Oil Company · 2002
- Data transfer69US 5,587,707 AFlight Refuelling Limited · 1996
- Remote well signalling apparatus and methods60US 4,181,014 AScientific Drilling Controls · 1980