E21B 47/13
By electromagnetic energy
Official title: by electromagnetic energy, e.g. radio frequency
E21B47/13 (By electromagnetic energy) appears on 2,586 US grants and 2,868 published applications in this corpus.
Search patents in E21B- Granted patents
- 2,586
- Published applications
- 2,868
- Assignees
- 536
- Inventors
- 3,812
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 2 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 2 | 0 |
| 1986 | 8 | 0 |
| 1987 | 7 | 0 |
| 1988 | 9 | 0 |
| 1989 | 15 | 0 |
| 1990 | 10 | 0 |
| 1991 | 5 | 0 |
| 1992 | 9 | 0 |
| 1993 | 7 | 0 |
| 1994 | 6 | 0 |
| 1995 | 6 | 0 |
| 1996 | 12 | 0 |
| 1997 | 2 | 0 |
| 1998 | 9 | 0 |
| 1999 | 14 | 0 |
| 2000 | 16 | 0 |
| 2001 | 18 | 7 |
| 2002 | 20 | 28 |
| 2003 | 25 | 40 |
| 2004 | 30 | 61 |
| 2005 | 40 | 50 |
| 2006 | 43 | 45 |
| 2007 | 48 | 41 |
| 2008 | 23 | 50 |
| 2009 | 37 | 59 |
| 2010 | 39 | 63 |
| 2011 | 42 | 82 |
| 2012 | 48 | 70 |
| 2013 | 37 | 102 |
| 2014 | 57 | 157 |
| 2015 | 104 | 204 |
| 2016 | 126 | 229 |
| 2017 | 182 | 228 |
| 2018 | 188 | 257 |
| 2019 | 247 | 221 |
| 2020 | 231 | 174 |
| 2021 | 216 | 190 |
| 2022 | 157 | 155 |
| 2023 | 174 | 106 |
| 2024 | 120 | 101 |
| 2025 | 95 | 89 |
| 2026 | 80 | 59 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Integrating ethernet technology within drilling systems6 Oct 2026US 12,753,688 B2Schlumberger Technology Corporation
- Horizontal directional drilling system and method6 Oct 2026US 12,753,690 B2Vermeer Manufacturing Company
- Subsurface detection system and method6 Oct 2026US 12,753,692 B2Schlumberger Technology Corporation
- Communication protocol in directional drilling system, apparatus and method utilizing multi-bit data symbol transmission6 Oct 2026US 12,754,302 B2Merlin Technology, Inc.
- Motion effect detection6 Oct 2026US 12,754,342 B2Schlumberger Technology Corporation
- Optical cable straightening structure for logging while drilling, and drilling device1 Oct 2026US 2026/0298033 A1Wuhan University of Technology
- Downhole flow monitoring and evaluation using distributed acoustic sensing and acoustic noise logging1 Oct 2026US 2026/0298078 A1Halliburton Energy Services.Inc.
- Pressure vessel antennas and containers for electronic circuitry1 Oct 2026US 2026/0302588 A1
- Underground directional drilling apparatus24 Sep 2026US 2026/0286786 A1Melfred Borzall, Inc.
- Alignable guidance device for casing entry milling and cementing operations24 Sep 2026US 2026/0286789 A1Scientific Drilling International, 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 system for monitoring smart structures utilizing distributed optical sensors332US 6,913,079 B22005
- Selective excitation of heating electrodes for oil wells314US 5,751,895 AEOR International, Inc. · 1998
- Short hop communication link for downhole MWD system294US 5,160,925 ADevelco, Inc. · 1992
- Downhole data transmission system288US 6,670,880 B1Novatek Engineering, Inc. · 2003