E21B 4/04
Electric drives
Official title: Electric drives (E21B4/12 takes precedence)
E21B4/04 (Electric drives) appears on 245 US grants and 252 published applications in this corpus.
Search patents in E21B- Granted patents
- 245
- Published applications
- 252
- Assignees
- 94
- Inventors
- 479
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 2 |
| 2002 | 2 | 0 |
| 2003 | 4 | 3 |
| 2004 | 0 | 8 |
| 2005 | 4 | 5 |
| 2006 | 7 | 3 |
| 2007 | 6 | 4 |
| 2008 | 2 | 10 |
| 2009 | 4 | 16 |
| 2010 | 6 | 8 |
| 2011 | 5 | 6 |
| 2012 | 8 | 4 |
| 2013 | 4 | 9 |
| 2014 | 8 | 10 |
| 2015 | 6 | 10 |
| 2016 | 9 | 19 |
| 2017 | 7 | 13 |
| 2018 | 18 | 9 |
| 2019 | 21 | 24 |
| 2020 | 19 | 21 |
| 2021 | 21 | 14 |
| 2022 | 18 | 16 |
| 2023 | 16 | 16 |
| 2024 | 15 | 12 |
| 2025 | 8 | 6 |
| 2026 | 6 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Composite umbilical for pulse power boring system25 Aug 2026US 12,716,297 B2Halliburton Energy Services.Inc.
- Bottomhole assembly for geothermal field construction25 Aug 2026US 12,716,345 B2Bedrock Energy, Inc.
- Handheld augers operable in a normal mode and a breaker mode14 Jul 2026US 12,680,388 B2Milwaukee Electric Tool Corporation
- Drilling rig power supply bus management28 Apr 2026US 12,614,910 B2Rouse Industries Inc.
- Thermal conductivity measurements for optimizing geothermal field construction17 Mar 2026US 12,577,868 B2Bedrock Energy, Inc.
- Augers8 Oct 2026US 2026/0308981 A1Milwaukee Electric Tool Corporation
- Drilling robot with an extrusion unit10 Sep 2026US 2026/0266139 A1ZHAW - Zürcher Hochschule Für Angewandte Wissenschaften
- Composite umbilical for pulse power boring system16 Jul 2026US 2026/0201753 A1Halliburton Energy Services.Inc.
- Electric annular with rotational gear driven pusher14 May 2026US 2026/0132700 A1Schlumberger Technology Corporation
- Self-propelled tubular apparatus6 Nov 2025US 2025/0341141 A1
Most cited
By later US patents
- Down-hole drilling apparatus209US 4,463,814 AAdvanced Drilling Corporation · 1984
- Parameter monitoring and control for an electric driven hydraulic fracking system192US 10,753,165 B1National Service Alliance—Houston LLC · 2020
- Downhole tractor185US 6,273,189 B1Halliburton Energy Services.Inc. · 2001
- Variable frequency drive configuration for electric driven hydraulic fracking system177US 10,753,153 B1National Service Alliance—Houston LLC · 2020
- High power umbilicals for subterranean electric drilling machines and remotely operated vehicles138US 6,857,486 B2Smart Drilling and Completion, Inc. · 2005