E21B 10/08
Roller bits
Official title: Roller bits (E21B10/26 takes precedence; roller core bits E21B10/06; characterised by wear resisting parts E21B10/50)
E21B10/08 (Roller bits) appears on 1,581 US grants and 850 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,581
- Published applications
- 850
- Assignees
- 282
- Inventors
- 1,601
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 33 | 0 |
| 1977 | 37 | 0 |
| 1978 | 32 | 0 |
| 1979 | 29 | 0 |
| 1980 | 62 | 0 |
| 1981 | 63 | 0 |
| 1982 | 24 | 0 |
| 1983 | 43 | 0 |
| 1984 | 38 | 0 |
| 1985 | 46 | 0 |
| 1986 | 41 | 0 |
| 1987 | 28 | 0 |
| 1988 | 42 | 0 |
| 1989 | 28 | 0 |
| 1990 | 17 | 0 |
| 1991 | 25 | 0 |
| 1992 | 17 | 0 |
| 1993 | 20 | 0 |
| 1994 | 28 | 0 |
| 1995 | 28 | 0 |
| 1996 | 26 | 0 |
| 1997 | 24 | 0 |
| 1998 | 26 | 0 |
| 1999 | 24 | 0 |
| 2000 | 30 | 0 |
| 2001 | 43 | 14 |
| 2002 | 43 | 20 |
| 2003 | 39 | 29 |
| 2004 | 24 | 40 |
| 2005 | 14 | 47 |
| 2006 | 31 | 38 |
| 2007 | 27 | 32 |
| 2008 | 31 | 55 |
| 2009 | 23 | 41 |
| 2010 | 41 | 43 |
| 2011 | 34 | 52 |
| 2012 | 24 | 28 |
| 2013 | 32 | 38 |
| 2014 | 24 | 41 |
| 2015 | 28 | 39 |
| 2016 | 41 | 58 |
| 2017 | 24 | 38 |
| 2018 | 47 | 31 |
| 2019 | 42 | 46 |
| 2020 | 40 | 31 |
| 2021 | 38 | 28 |
| 2022 | 27 | 20 |
| 2023 | 13 | 9 |
| 2024 | 17 | 12 |
| 2025 | 15 | 11 |
| 2026 | 8 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21B 10/22Characterised by bearing, lubrication or sealing details744
- E21B 10/16Characterised by tooth form or arrangement337
- E21B 10/18Characterised by conduits or nozzles for drilling fluids257
- E21B 10/20Characterised by detachable or adjustable parts204
- E21B 10/14Combined with non-rolling cutters other than of leading-portion type103
- E21B 10/12With discs cutters89
- E21B 10/10With roller axle supported at both ends67
- E21B 10/083With longitudinal axis23
All 9 subgroupsShow fewer
Recent patents
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- Bearing assembly with flow restrictor for a dual rod directional drilling apparatus and method of use28 Jul 2026US 12,692,750 B2Hunting Energy Services, Inc.
- Earth-boring tools, hybrid earth-boring tools, and associated apparatus and methods27 Aug 2026US 2026/0251018 A1Baker Hughes Oilfield Operations LLC
- Drill bit and method for directional drilling27 Aug 2026US 2026/0251019 A1Canopus Drilling Solutions Holding B.V.
- Pdc-roller hybrid drill bit6 Aug 2026US 2026/0226798 A1China Petroleum & Chemical Corporation
- Fully sealed down the hole hammer16 Jul 2026US 2026/0201760 A1Sandvik Mining and Construction Oy
- Rotating check valve for improved downhole operations2 Jul 2026US 2026/0185408 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Composite polycrystalline diamond compact502US 4,604,106 ASmith International, Inc. · 1986
- Polycrystalline diamond bearing system for a roller cone rock bit395US 4,738,322 ASmith International, Inc. · 1988
- Drill bit arcuate-shaped inserts with cutting edges and method of manufacture391US 7,331,410 B2Smith International, Inc. · 2008
- 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