E21B 4/02
Fluid rotary type drives
E21B4/02 (Fluid rotary type drives) appears on 1,145 US grants and 917 published applications in this corpus.
Search patents in E21B- Granted patents
- 1,145
- Published applications
- 917
- Assignees
- 352
- Inventors
- 1,551
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 20 | 0 |
| 1977 | 16 | 0 |
| 1978 | 9 | 0 |
| 1979 | 5 | 0 |
| 1980 | 10 | 0 |
| 1981 | 26 | 0 |
| 1982 | 11 | 0 |
| 1983 | 13 | 0 |
| 1984 | 18 | 0 |
| 1985 | 18 | 0 |
| 1986 | 8 | 0 |
| 1987 | 16 | 0 |
| 1988 | 12 | 0 |
| 1989 | 14 | 0 |
| 1990 | 10 | 0 |
| 1991 | 13 | 0 |
| 1992 | 15 | 0 |
| 1993 | 11 | 0 |
| 1994 | 11 | 0 |
| 1995 | 6 | 0 |
| 1996 | 8 | 0 |
| 1997 | 4 | 0 |
| 1998 | 12 | 0 |
| 1999 | 4 | 0 |
| 2000 | 9 | 0 |
| 2001 | 11 | 3 |
| 2002 | 9 | 3 |
| 2003 | 15 | 9 |
| 2004 | 4 | 18 |
| 2005 | 9 | 9 |
| 2006 | 13 | 11 |
| 2007 | 10 | 8 |
| 2008 | 5 | 16 |
| 2009 | 7 | 17 |
| 2010 | 12 | 24 |
| 2011 | 17 | 28 |
| 2012 | 14 | 32 |
| 2013 | 24 | 39 |
| 2014 | 27 | 46 |
| 2015 | 44 | 86 |
| 2016 | 43 | 77 |
| 2017 | 68 | 74 |
| 2018 | 60 | 80 |
| 2019 | 91 | 65 |
| 2020 | 90 | 57 |
| 2021 | 61 | 47 |
| 2022 | 48 | 44 |
| 2023 | 58 | 37 |
| 2024 | 37 | 32 |
| 2025 | 47 | 36 |
| 2026 | 22 | 19 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Hydrojets rotary drill bit6 Oct 2026US 12,753,657 B2Cooled Edge Bits, Inc.
- Enclosed torque controlled electric actuator and method8 Sep 2026US 12,732,056 B2Premium Oilfield Technologies, LLC
- System and method for anchoring and stroking a downhole motor milling assembly in a floating rig environment1 Sep 2026US 12,723,481 B2Halliburton Energy Services.Inc.
- On-demand vibration tool for drilling applications1 Sep 2026US 12,723,483 B2Dynomax Drilling Tools Inc.
- Stall detection and recovery for mud motors25 Aug 2026US 12,716,348 B2Helmerich & Payne, Inc.
- Systems and methods for real time downhole motor power curve generation3 Sep 2026US 2026/0258722 A1Schlumberger Technology Corporation
- On demand flow pulsing system20 Aug 2026US 2026/0243134 A1National Oilwell Varco, L. P.
- Rotating control device assembly for use with a subterranean well20 Aug 2026US 2026/0243142 A1
- Anisotropic stator reinforcement lining30 Jul 2026US 2026/0218572 A1Schlumberger Technology Corporation
- Downhole positive displacement motor and associated systems and methods23 Jul 2026US 2026/0210185 A1Ensign Energy Services
Most cited
By later US patents
- Thrust bearing assembly for a downhole drill motor475US 4,560,014 ASmith International, Inc. · 1985
- Well drilling tool with diamond radial/thrust bearings383US 4,410,054 AMaurer Engineering Inc. · 1983
- Steerable rotary drilling systems281US 5,265,682 ACamco Drilling Group Limited · 1993
- Modulated bias units for steerable rotary drilling systems268US 5,553,678 ACamco International Inc. · 1996
- Drilling with casing and retrievable bit-motor assembly249US 5,472,057 AAtlantic Richfield Company · 1995