E21B 12/00
Accessories for drilling tools
E21B12/00 (Accessories for drilling tools) appears on 447 US grants and 373 published applications in this corpus.
Search patents in E21B- Granted patents
- 447
- Published applications
- 373
- Assignees
- 178
- Inventors
- 779
- Latest grant
- 29 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 8 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 8 | 0 |
| 1988 | 5 | 0 |
| 1989 | 3 | 0 |
| 1990 | 6 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 6 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 7 | 0 |
| 1999 | 4 | 0 |
| 2000 | 8 | 0 |
| 2001 | 5 | 3 |
| 2002 | 8 | 13 |
| 2003 | 12 | 5 |
| 2004 | 8 | 6 |
| 2005 | 1 | 5 |
| 2006 | 5 | 4 |
| 2007 | 4 | 1 |
| 2008 | 6 | 10 |
| 2009 | 7 | 8 |
| 2010 | 6 | 9 |
| 2011 | 6 | 11 |
| 2012 | 7 | 11 |
| 2013 | 6 | 8 |
| 2014 | 10 | 11 |
| 2015 | 13 | 29 |
| 2016 | 9 | 20 |
| 2017 | 21 | 34 |
| 2018 | 29 | 18 |
| 2019 | 24 | 27 |
| 2020 | 31 | 30 |
| 2021 | 31 | 20 |
| 2022 | 28 | 28 |
| 2023 | 27 | 17 |
| 2024 | 18 | 12 |
| 2025 | 13 | 12 |
| 2026 | 17 | 21 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Earth-boring tools, hybrid earth-boring tools, and associated apparatus and methods29 Sep 2026US 12,747,636 B2Baker Hughes Oilfield Operations LLC
- System and method for mobile drilling machine15 Sep 2026US 12,735,958 B2Caterpillar Inc.
- Calibration of drillstring weight with drag for friction factor estimation11 Aug 2026US 12,704,058 B2Landmark Graphics Corporation
- System for determining health of drill string components of drilling machines28 Jul 2026US 12,692,756 B2Caterpillar Global Mining Equipment LLC
- Identification and mitigation of whirl within a drilling system21 Jul 2026US 12,687,101 B1Schlumberger Technology Corporation
- Increased drill bit or lower bha inertia for reducing hfto24 Sep 2026US 2026/0286783 A1Schlumberger Technology Corporation
- Drilling assembly systems and methods10 Sep 2026US 2026/0266137 A1
- Earth-boring tools, hybrid earth-boring tools, and associated apparatus and methods27 Aug 2026US 2026/0251018 A1Baker Hughes Oilfield Operations LLC
- Drill bit cutter identification and grading13 Aug 2026US 2026/0237039 A1Schlumberger Technology Corporation
- Completions-based well cleanout using magnetic cleanout tool30 Jul 2026US 2026/0218587 A1Halliburton Energy Services.Inc.
Most cited
By later US patents
- Method and system for predicting performance of a drilling system for a given formation216US 6,408,953 B1Halliburton Energy Services.Inc. · 2002
- Wellbore milling and drilling190US 5,887,655 AWeatherford/Lamb, Inc. · 1999
- Wellbore milling-- drilling166US 5,887,668 AWeatherford/Lamb, Inc. · 1999
- Iterative drilling simulation process for enhanced economic decision making165US 6,612,382 B2Halliburton Energy Services.Inc. · 2003
- Method and apparatus for monitoring and recording of operating conditions of a downhole drill bit during drilling operations152US 5,813,480 ABaker Hughes Incorporated · 1998