E21B 4/12
Electrically operated hammers
E21B4/12 (Electrically operated hammers) appears on 13 US grants and 10 published applications in this corpus.
Search patents in E21B- Granted patents
- 13
- Published applications
- 10
- Assignees
- 12
- Inventors
- 21
- Latest grant
- 11 Oct 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 3 |
| 2018 | 0 | 3 |
| 2019 | 3 | 0 |
| 2020 | 1 | 0 |
| 2021 | 1 | 2 |
| 2022 | 2 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Frequency modulation for magnetic pressure pulse tool11 Oct 2022US 11,465,229 B2Baker Hughes Incorporated
- Downhole jarring tool with electrical pass through25 Jan 2022US 11,230,900 B2Robertson Intellectual Properties, LLC
- Frequency modulation for magnetic pressure pulse tool25 May 2021US 11,014,191 B2Baker Hughes, A Ge Company, LLC
- Magnetic pulse actuation arrangement for downhole tools and method24 Mar 2020US 10,596,655 B2Baker Hughes, A Ge Company, LLC
- Downhole stroking tool8 Oct 2019US 10,435,977 B2Welltec A/S
- Drilling robot1 Jan 2026US 2026/0002414 A1ZHAW - Zürcher Hochschule Für Angewandte Wissenschaften
- Frequency modulation for magnetic pressure pulse tool10 Jun 2021US 2021/0170519 A1Baker Hughes, A Ge Company, LLC
- Downhole Jarring Tool With Electrical Pass Through18 Feb 2021US 2021/0047894 A1Robertson Intellectual Properties, LLC
- Frequency modulation for magnetic pressure pulse tool15 Feb 2018US 2018/0043463 A1Baker Hughes Incorporated
- Magnetic pulse actuation arrangement for downhole tools and method15 Feb 2018US 2018/0045007 A1Baker Hughes, A Ge Company, LLC
Most cited
By later US patents
- Electromagnetic drilling apparatus and method57US 4,722,402 A1988
- Electromagnetic drilling apparatus17US 5,018,590 AParker Kinetic Designs, Inc. · 1991
- Electromagnetic drilling apparatus16US 4,899,834 AParker Kinetic Designs, Inc. · 1990
- Electric motor14US 5,068,554 AFramo Developments (UK) Limited · 1991
- Method and apparatus for subsurface exploration11US 6,488,105 B1California Institute of Technology · 2002