E21B 3/02
Surface drives for rotary drilling
E21B3/02 (Surface drives for rotary drilling) appears on 1,029 US grants and 939 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,029
- Published applications
- 939
- Assignees
- 371
- Inventors
- 1,543
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 9 | 0 |
| 1977 | 7 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 8 | 0 |
| 1981 | 11 | 0 |
| 1982 | 11 | 0 |
| 1983 | 6 | 0 |
| 1984 | 9 | 0 |
| 1985 | 3 | 0 |
| 1986 | 9 | 0 |
| 1987 | 7 | 0 |
| 1988 | 10 | 0 |
| 1989 | 20 | 0 |
| 1990 | 4 | 0 |
| 1991 | 7 | 0 |
| 1992 | 8 | 0 |
| 1993 | 13 | 0 |
| 1994 | 9 | 0 |
| 1995 | 6 | 0 |
| 1996 | 6 | 0 |
| 1997 | 3 | 0 |
| 1998 | 6 | 0 |
| 1999 | 1 | 0 |
| 2000 | 5 | 0 |
| 2001 | 7 | 4 |
| 2002 | 9 | 9 |
| 2003 | 8 | 11 |
| 2004 | 17 | 21 |
| 2005 | 11 | 23 |
| 2006 | 23 | 23 |
| 2007 | 18 | 35 |
| 2008 | 18 | 26 |
| 2009 | 20 | 42 |
| 2010 | 34 | 30 |
| 2011 | 17 | 32 |
| 2012 | 29 | 16 |
| 2013 | 24 | 41 |
| 2014 | 34 | 42 |
| 2015 | 26 | 48 |
| 2016 | 38 | 66 |
| 2017 | 46 | 66 |
| 2018 | 49 | 65 |
| 2019 | 69 | 70 |
| 2020 | 90 | 66 |
| 2021 | 61 | 44 |
| 2022 | 46 | 38 |
| 2023 | 40 | 26 |
| 2024 | 47 | 43 |
| 2025 | 39 | 25 |
| 2026 | 21 | 27 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Controlling a drilling operation based on stored torque in a drill string22 Sep 2026US 12,742,378 B2Pason Systems Corp.
- Telescoping torque reaction track device25 Aug 2026US 12,716,298 B2
- Method and apparatus for moving tubular rotary slips25 Aug 2026US 12,716,301 B2Helmerich & Payne, Inc.
- Motor angular position control25 Aug 2026US 12,719,392 B2Schlumberger Technology Corporation
- Spindle for drilling head28 Jul 2026US 12,692,747 B2
- Virtual brake system8 Oct 2026US 2026/0308980 A1The Charles Machine Works, Inc.
- Rotary drives for civil engineering1 Oct 2026US 2026/0298029 A1BAUER Maschinen GmbH
- Drill drive arrangement, multiple rotary drive arrangement, and drilling rig for civil engineering, as well as method for operating a drill drive arrangement for civil engineering1 Oct 2026US 2026/0298030 A1BAUER Maschinen GmbH
- Foundation work equipment for hybrid construction methods17 Sep 2026US 2026/0275811 A1Buma Ce, Ltd.
- Serviceable gripping systems for top drives27 Aug 2026US 2026/0251016 A1Patterson-UTI Drilling Company LLC
Most cited
By later US patents
- Drilling of wells with top drive unit220US 4,449,596 AVarco International, Inc. · 1984
- Top drive casing system213US 6,536,520 B1Weatherford/Lamb, Inc. · 2003
- Casing clamp203US 6,311,792 B1Tesco Corporation · 2001
- Hydraulic top drive for wells174US 4,813,493 ATriten Corporation · 1989
- Portable top drive assembly162US 5,433,279 A1995