E21B 12/04
Drill bit protectors
E21B12/04 (Drill bit protectors) appears on 48 US grants and 26 published applications in this corpus.
Search patents in E21B- Granted patents
- 48
- Published applications
- 26
- Assignees
- 21
- Inventors
- 97
- Latest grant
- 30 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 3 | 0 |
| 1999 | 2 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 2 | 3 |
| 2003 | 3 | 1 |
| 2004 | 1 | 1 |
| 2005 | 1 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 1 | 4 |
| 2012 | 3 | 3 |
| 2013 | 2 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 1 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 2 | 1 |
| 2023 | 2 | 1 |
| 2024 | 1 | 2 |
| 2025 | 1 | 1 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Increased drill bit or lower BHA inertia for reducing HFTO30 Jun 2026US 12,669,019 B2Schlumberger Technology Corporation
- PDC drill bit with swing self-adaptive cushion structure17 Feb 2026US 12,553,293 B2Chengdu Weiyi Petroleum Technology Co., Ltd.
- Motor cooling and debris management during milling2 Dec 2025US 12,486,720 B1Halliburton Energy Services.Inc.
- Blade cover9 Jul 2024US 12,031,386 B2Schlumberger Technology Corporation
- Piston-based backup assembly for drill bit17 Oct 2023US 11,788,362 B2Halliburton Energy Services.Inc.
- Increased drill bit or lower bha inertia for reducing hfto24 Sep 2026US 2026/0286783 A1Schlumberger Technology Corporation
- Window Mill for Sidetracking12 Feb 2026US 2026/0043304 A1
- Increased drill bit or lower bha inertia for reducing hfto4 Sep 2025US 2025/0277411 A1Schlumberger Technology Corporation
- PDC Drill Bit with Swing Self-adaptive Cushion Structure11 Jul 2024US 2024/0229563 A1Chengdu Weiyi Petroleum Technology Co., Ltd.
- Blade cover11 Jan 2024US 2024/0011358 A1Schlumberger Technology Corporation
Most cited
By later US patents
- Wellbore milling and drilling190US 5,887,655 AWeatherford/Lamb, Inc. · 1999
- Wellbore milling-- drilling166US 5,887,668 AWeatherford/Lamb, Inc. · 1999
- Variable wear pad for crossflow drag bit118US 4,253,533 ASmith International, Inc. · 1981
- Wellbore single trip milling105US 5,826,651 AWeatherford/Lamb, Inc. · 1998
- Drill bits with reduced exposure of cutters105US 6,460,631 B2Baker Hughes Incorporated · 2002