E21B 10/30
Longitudinal axis roller reamers
Official title: Longitudinal axis roller reamers, e.g. reamer stabilisers
E21B10/30 (Longitudinal axis roller reamers) appears on 73 US grants and 36 published applications in this corpus.
Search patents in E21B- Granted patents
- 73
- Published applications
- 36
- Assignees
- 37
- Inventors
- 96
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 6 | 0 |
| 1979 | 0 | 0 |
| 1980 | 6 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 2 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 2 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 1 | 3 |
| 2014 | 0 | 0 |
| 2015 | 1 | 2 |
| 2016 | 1 | 1 |
| 2017 | 2 | 3 |
| 2018 | 0 | 1 |
| 2019 | 0 | 5 |
| 2020 | 4 | 1 |
| 2021 | 4 | 6 |
| 2022 | 5 | 0 |
| 2023 | 2 | 2 |
| 2024 | 1 | 2 |
| 2025 | 3 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Splined/grooved 2 piece bit assembly16 Jun 2026US 12,655,693 B2Halliburton Energy Services.Inc.
- Slimline stop collar with seal to prevent micro-annulus leakage29 Apr 2025US 12,286,845 B2Downhole Products Limited
- Splined/grooved 2 piece bit assembly4 Mar 2025US 12,241,311 B2Halliburton Energy Services.Inc.
- Downhole traction tool and method of use18 Feb 2025US 12,227,997 B2Innovative Drilling Systems Limited
- Service connector9 Jul 2024US 12,031,381 B2Engineering Innovation & Design Limited
- Splined/grooved 2 piece bit assembly30 Apr 2026US 2026/0117594 A1Halliburton Energy Services.Inc.
- Slimline stop collar with seal to prevent micro-annulus leakage20 Mar 2025US 2025/0092743 A1Downhole Products Limited
- Splined/grooved 2 piece bit assembly12 Dec 2024US 2024/0410230 A1Halliburton Energy Services.Inc.
- Cutter assembly11 Jul 2024US 2024/0229562 A1Nxg Technologies Limited
- Dual Angle Wedge Retention System16 Nov 2023US 2023/0366273 A1Chengdu Best Diamond Bit Co., Ltd
Most cited
By later US patents
- Method and apparatus for well drilling57US 4,792,000 AOil Patch Group, Inc. · 1988
- Combined stabilizer and reamer for drilling well bores44US 4,231,437 AChristensen, Inc. · 1980
- Stabilizing tool for well drilling39US 4,776,410 AOil Patch Group, Inc. · 1988
- Pile forming apparatus29US 6,033,152 ABerkel & Company Contractors, Inc. · 2000
- Drilling torsional friction reducer23US 5,339,910 AUnion Oil Company of California · 1994