E21B 4/10
Continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
Official title: continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts
E21B4/10 (Continuous unidirectional rotary motion of shaft or drilling pipe effecting consecutive impacts) appears on 72 US grants and 60 published applications in this corpus.
Search patents in E21B- Granted patents
- 72
- Published applications
- 60
- Assignees
- 38
- Inventors
- 101
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 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 | 0 | 0 |
| 2002 | 0 | 2 |
| 2003 | 0 | 2 |
| 2004 | 4 | 4 |
| 2005 | 0 | 2 |
| 2006 | 3 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 0 | 1 |
| 2013 | 1 | 4 |
| 2014 | 4 | 5 |
| 2015 | 3 | 4 |
| 2016 | 4 | 5 |
| 2017 | 2 | 4 |
| 2018 | 10 | 10 |
| 2019 | 3 | 2 |
| 2020 | 8 | 2 |
| 2021 | 5 | 4 |
| 2022 | 2 | 1 |
| 2023 | 3 | 3 |
| 2024 | 3 | 1 |
| 2025 | 0 | 2 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Torque-adaptive impact tool suitable for PDC bit14 Jul 2026US 12,680,385 B2Southwest Petroleum University
- Drill bit assembly for reverse circulation hammer2 Jun 2026US 12,644,338 B2Mincon International Limited
- Well drilling tool and method for determining parameter thereof9 Jul 2024US 12,031,410 B2China Petroleum & Chemical Corporation
- Drilling tool2 Apr 2024US 11,946,342 B2China Petroleum & Chemical Corporation
- Well drilling acceleration tool5 Mar 2024US 11,920,437 B2China Petroleum & Chemical Corporation
- Drill string apparatus11 Jun 2026US 2026/0160132 A1
- Wireline intervention tool string11 Sep 2025US 2025/0283380 A1Welltec A/S
- Drill bit assembly for reverse circulation hammer7 Aug 2025US 2025/0250862 A1Mincon International Limited
- Torque-adaptive impact tool suitable for pdc bit30 May 2024US 2024/0175323 A1Southwest Petroleum University
- Downhole wireline tool8 Jun 2023US 2023/0175320 A1Welltec A/S
Most cited
By later US patents
- Tubing expansion94US 6,695,065 B2Weatherford/Lamb, Inc. · 2004
- Apparatus for vibrating a pipe string in a borehole90US 4,890,682 AShell Oil Company · 1990
- Activated earth drill38US 4,796,713 A1989
- Ball transfer mechanism with polycrystalline diamond bearing support24US 10,968,700 B1National Technology & Engineering Solutions of Sandia, LLC · 2021
- Rotary driven drilling hammer22US 6,761,231 B1The Charles Machines Works, Inc. · 2004