E21B 10/20
Characterised by detachable or adjustable parts
Official title: characterised by detachable or adjustable parts, e.g. legs or axles
E21B10/20 (Characterised by detachable or adjustable parts) appears on 204 US grants and 69 published applications in this corpus.
Search patents in E21B- Granted patents
- 204
- Published applications
- 69
- Assignees
- 73
- Inventors
- 273
- Latest grant
- 27 May 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 6 | 0 |
| 1978 | 8 | 0 |
| 1979 | 11 | 0 |
| 1980 | 10 | 0 |
| 1981 | 7 | 0 |
| 1982 | 5 | 0 |
| 1983 | 5 | 0 |
| 1984 | 5 | 0 |
| 1985 | 7 | 0 |
| 1986 | 8 | 0 |
| 1987 | 6 | 0 |
| 1988 | 9 | 0 |
| 1989 | 9 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 2 | 0 |
| 1993 | 6 | 0 |
| 1994 | 6 | 0 |
| 1995 | 6 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 5 | 0 |
| 2001 | 1 | 0 |
| 2002 | 5 | 0 |
| 2003 | 1 | 0 |
| 2004 | 3 | 5 |
| 2005 | 0 | 0 |
| 2006 | 2 | 0 |
| 2007 | 1 | 3 |
| 2008 | 2 | 2 |
| 2009 | 0 | 0 |
| 2010 | 0 | 3 |
| 2011 | 3 | 3 |
| 2012 | 0 | 1 |
| 2013 | 0 | 3 |
| 2014 | 0 | 3 |
| 2015 | 4 | 7 |
| 2016 | 4 | 4 |
| 2017 | 4 | 8 |
| 2018 | 6 | 4 |
| 2019 | 4 | 5 |
| 2020 | 6 | 7 |
| 2021 | 5 | 6 |
| 2022 | 6 | 3 |
| 2023 | 2 | 0 |
| 2024 | 1 | 2 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Drill bit for boring earth and other hard materials27 May 2025US 12,312,868 B2Ulterra Drilling Technologies, L.P.
- Hybrid bit10 Sep 2024US 12,084,919 B2Schlumberger Technology Corporation
- Drill coupler for mitigating torsional vibration14 Nov 2023US 11,814,907 B2Ulterra Drilling Technologies, L.P.
- Continuous sampling drill bit5 Sep 2023US 11,746,600 B2Longyear TM, Inc.
- Drill bit for boring earth and other hard materials20 Dec 2022US 11,530,577 B2Ulterra Drilling Technologies, L.P.
- Cutter assembly11 Jul 2024US 2024/0229562 A1Nxg Technologies Limited
- Continuous Sampling Drill Bit4 Jan 2024US 2024/0003192 A1Longyear TM, Inc.
- Continuous sampling drill bit15 Sep 2022US 2022/0290501 A1Bly IP Inc.
- Hybrid bit14 Jul 2022US 2022/0220807 A1Schlumberger Technology Corporation
- Drill bit for boring earth and other hard materials27 Jan 2022US 2022/0025712 A1Ulterra Drilling Technologies, L.P.
Most cited
By later US patents
- Polycrystalline diamond bearing system for a roller cone rock bit395US 4,738,322 ASmith International, Inc. · 1988
- Bit for subterranean drilling fabricated from separately-formed major components380US 5,560,440 ABaker Hughes Incorporated · 1996
- Expandable gage bit for drilling and method of drilling271US 5,361,859 ABaker Hughes Incorporated · 1994
- Polycrystalline diamond bearing system for a roller cone rock bit202US 4,802,539 ASmith International, Inc. · 1989
- Centered-leg roller cone drill bit157US 6,439,326 B1Smith International, Inc. · 2002