E21B 47/24
By positive mud pulses using a flow restricting valve within the drill
Official title: by positive mud pulses using a flow restricting valve within the drill pipe
E21B47/24 (By positive mud pulses using a flow restricting valve within the drill) appears on 269 US grants and 187 published applications in this corpus.
Search patents in E21B- Granted patents
- 269
- Published applications
- 187
- Assignees
- 108
- Inventors
- 341
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 4 | 0 |
| 1985 | 7 | 0 |
| 1986 | 3 | 0 |
| 1987 | 8 | 0 |
| 1988 | 5 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 4 | 0 |
| 1994 | 3 | 0 |
| 1995 | 3 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 7 | 0 |
| 2001 | 5 | 1 |
| 2002 | 4 | 2 |
| 2003 | 3 | 3 |
| 2004 | 1 | 3 |
| 2005 | 3 | 6 |
| 2006 | 2 | 3 |
| 2007 | 1 | 9 |
| 2008 | 7 | 4 |
| 2009 | 2 | 3 |
| 2010 | 2 | 4 |
| 2011 | 2 | 1 |
| 2012 | 5 | 9 |
| 2013 | 5 | 11 |
| 2014 | 8 | 7 |
| 2015 | 5 | 15 |
| 2016 | 12 | 14 |
| 2017 | 19 | 19 |
| 2018 | 15 | 15 |
| 2019 | 24 | 14 |
| 2020 | 12 | 11 |
| 2021 | 1 | 6 |
| 2022 | 12 | 6 |
| 2023 | 10 | 12 |
| 2024 | 8 | 3 |
| 2025 | 5 | 3 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Mud pulser having a filter housing16 Jun 2026US 12,655,758 B2China Petroleum & Chemical Corporation
- Axial sinusoidal pulser20 Jan 2026US 12,529,305 B1Schlumberger Technology Corporation
- Methods for downhole drilling and communication18 Nov 2025US 12,473,785 B2Schlumberger Technology Corporation
- Mud pulser18 Nov 2025US 12,473,824 B2China Petroleum & Chemical Corporation
- Top-mounted mud-telemetry pulser assembly for downhole communications, and downhole valve11 Nov 2025US 12,467,356 B2Vertex Downhole Technologies Inc.
- Drill bit steering system11 Jun 2026US 2026/0160133 A1Baker Hughes Oilfield Operations LLC
- Force balanced dual valve systems for steering tool and methods of using the same11 Jun 2026US 2026/0161189 A1Baker Hughes Oilfield Operations LLC
- Mud pulser having a filter housing30 Apr 2026US 2026/0117650 A1China Petroleum & Chemical Corporation
- Rotary pulser with flow bypass elements25 Dec 2025US 2025/0389186 A1APS Technology, Inc.
- Differential pressure actuated flow valve18 Sep 2025US 2025/0290387 A1MS Directional, LLC
Most cited
By later US patents
- Method and apparatus for providing controlled force transference to a wellbore tool200US 5,343,963 A1994
- Pilot operated mud-pulse valve134US 3,958,217 ATeleco Inc. · 1976
- Downhole signaling system129US 3,964,556 AGearhart-Owen Industries, Inc. · 1976
- Subsurface well apparatus118US 6,055,213 ABaker Hughes Incorporated · 2000
- Method and apparatus for communicating data in a wellbore and for detecting the influx of gas115US 5,592,438 ABaker Hughes Incorporated · 1997