E21B 10/42
Rotary drag type drill bits with teeth, blades or like cutting elements
Official title: Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits (characterised by wear resisting parts E21B10/46; by conduits or nozzles for drilling fluid E21B10/60; by detachable or adjustable parts E21B10/62)
E21B10/42 (Rotary drag type drill bits with teeth, blades or like cutting elements) appears on 714 US grants and 771 published applications in this corpus.
Search patents in E21B- Granted patents
- 714
- Published applications
- 771
- Assignees
- 192
- Inventors
- 1,045
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 3 | 0 |
| 1984 | 3 | 0 |
| 1985 | 6 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 7 | 0 |
| 1992 | 2 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 3 | 0 |
| 1997 | 6 | 0 |
| 1998 | 2 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 7 |
| 2002 | 9 | 11 |
| 2003 | 6 | 7 |
| 2004 | 7 | 5 |
| 2005 | 2 | 1 |
| 2006 | 5 | 13 |
| 2007 | 2 | 13 |
| 2008 | 7 | 31 |
| 2009 | 8 | 29 |
| 2010 | 21 | 34 |
| 2011 | 16 | 35 |
| 2012 | 20 | 26 |
| 2013 | 22 | 38 |
| 2014 | 29 | 32 |
| 2015 | 31 | 42 |
| 2016 | 33 | 56 |
| 2017 | 32 | 30 |
| 2018 | 52 | 46 |
| 2019 | 42 | 41 |
| 2020 | 49 | 54 |
| 2021 | 46 | 40 |
| 2022 | 43 | 57 |
| 2023 | 44 | 33 |
| 2024 | 44 | 31 |
| 2025 | 45 | 29 |
| 2026 | 26 | 30 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hydrojets rotary drill bit6 Oct 2026US 12,753,657 B2Cooled Edge Bits, Inc.
- Earth-boring tools, hybrid earth-boring tools, and associated apparatus and methods29 Sep 2026US 12,747,636 B2Baker Hughes Oilfield Operations LLC
- Drill head for use with microtunneling apparatus15 Sep 2026US 12,735,946 B2OptionX Holdings Pty Ltd
- Jetting system for drilling operations8 Sep 2026US 12,729,588 B1Saudi Arabian Oil Company
- Drill head for use with microtunneling apparatus1 Sep 2026US 12,723,470 B2OptionX Holdings Pty Ltd
- Machine learning assessment of autonomous drill bit hard face quality17 Sep 2026US 2026/0278768 A1Schlumberger Technology Corporation
- Earth-boring tools including cutting elements having different characteristics in different regions of the earth-boring tools10 Sep 2026US 2026/0266140 A1Baker Hughes Oilfield Operations LLC
- Drill bit3 Sep 2026US 2026/0258705 A1Zerdalab Ltd.
- Earth-boring tools, hybrid earth-boring tools, and associated apparatus and methods27 Aug 2026US 2026/0251018 A1Baker Hughes Oilfield Operations LLC
- Pdc-roller hybrid drill bit6 Aug 2026US 2026/0226798 A1China Petroleum & Chemical Corporation
Most cited
By later US patents
- Expandable gage bit for drilling and method of drilling271US 5,361,859 ABaker Hughes Incorporated · 1994
- Stability enhanced drill bit and cutting structure having zones of varying wear resistance195US 5,607,024 ASmith International, Inc. · 1997
- Drilling assembly and method of drilling for unstable and depleted formations187US 5,957,225 ABP Amoco Corporation · 1999
- Diamond drag bit for soft formations154US 4,981,184 ASmith International, Inc. · 1991
- Bi-center and bit method for enhancing stability133US 5,678,644 ADiamond Products International, Inc. · 1997