E21B 10/26
Drill bits with leading portion, i.e. drill bits with a pilot cutter
Official title: Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers (percussion drill bits with leading portion E21B10/40)
E21B10/26 (Drill bits with leading portion, i.e. drill bits with a pilot cutter) appears on 1,143 US grants and 920 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,143
- Published applications
- 920
- Assignees
- 366
- Inventors
- 1,587
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 14 | 0 |
| 1977 | 16 | 0 |
| 1978 | 11 | 0 |
| 1979 | 5 | 0 |
| 1980 | 20 | 0 |
| 1981 | 17 | 0 |
| 1982 | 8 | 0 |
| 1983 | 22 | 0 |
| 1984 | 17 | 0 |
| 1985 | 20 | 0 |
| 1986 | 13 | 0 |
| 1987 | 10 | 0 |
| 1988 | 9 | 0 |
| 1989 | 12 | 0 |
| 1990 | 5 | 0 |
| 1991 | 15 | 0 |
| 1992 | 9 | 0 |
| 1993 | 16 | 0 |
| 1994 | 11 | 0 |
| 1995 | 18 | 0 |
| 1996 | 7 | 0 |
| 1997 | 8 | 0 |
| 1998 | 9 | 0 |
| 1999 | 17 | 0 |
| 2000 | 19 | 0 |
| 2001 | 8 | 4 |
| 2002 | 21 | 22 |
| 2003 | 19 | 17 |
| 2004 | 12 | 32 |
| 2005 | 21 | 17 |
| 2006 | 20 | 20 |
| 2007 | 13 | 27 |
| 2008 | 24 | 23 |
| 2009 | 15 | 24 |
| 2010 | 31 | 52 |
| 2011 | 30 | 49 |
| 2012 | 38 | 41 |
| 2013 | 33 | 52 |
| 2014 | 34 | 60 |
| 2015 | 50 | 44 |
| 2016 | 48 | 60 |
| 2017 | 43 | 53 |
| 2018 | 46 | 41 |
| 2019 | 51 | 49 |
| 2020 | 53 | 32 |
| 2021 | 37 | 42 |
| 2022 | 40 | 37 |
| 2023 | 35 | 38 |
| 2024 | 37 | 27 |
| 2025 | 40 | 40 |
| 2026 | 16 | 17 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Devices, systems, and methods for identifying a radial position of an expandable tool29 Sep 2026US 12,747,663 B1Schlumberger Technology Corporation
- Apparatus for centralization of downhole milling bit21 Jul 2026US 12,687,081 B1Halliburton Energy Services.Inc.
- Splined/grooved 2 piece bit assembly16 Jun 2026US 12,655,693 B2Halliburton Energy Services.Inc.
- Two part milling and running tool employing a body lock ring9 Jun 2026US 12,650,059 B2Halliburton Energy Services.Inc.
- Multilateral lateral bore completion employing degradable material26 May 2026US 12,637,924 B2Halliburton Energy Services.Inc.
- Generating operational plans for downhole operations20 Aug 2026US 2026/0243157 A1Schlumberger Technology Corporation
- Wellbore controllable chamber-forming granular-flow mining system6 Aug 2026US 2026/0226817 A1Blueland Technology Limited
- Earth boring reamer9 Jul 2026US 2026/0193941 A1Orvil Technologies, LLC
- Centrally located drill bit cleaning element2 Jul 2026US 2026/0185409 A1Schlumberger Technology Corporation
- Downhole tool including a two part drilling and running tool that couples its smaller assembly to a conveyance25 Jun 2026US 2026/0176923 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Drilling with casing and retrievable drill bit314US 5,271,472 AAtlantic Richfield Company · 1993
- Drilling with casing and retrievable drill bit289US 5,197,553 AAtlantic Richfield Company · 1993
- Expandable underreamer/stabilizer271US 6,732,817 B2Smith International, Inc. · 2004
- Cutter blades for rotary tubing tools210US 5,242,017 A1993
- Combination mill and drill bit197US 6,131,675 ABaker Hughes Incorporated · 2000