E21B 4/16
Plural down-hole drives
Official title: Plural down-hole drives, e.g. for combined percussion and rotary drilling (E21B4/10 takes precedence); Drives for multi-bit drilling units
E21B4/16 (Plural down-hole drives) appears on 163 US grants and 92 published applications in this corpus.
Search patents in E21B- Granted patents
- 163
- Published applications
- 92
- Assignees
- 96
- Inventors
- 352
- Latest grant
- 14 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 6 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 3 | 0 |
| 1988 | 6 | 0 |
| 1989 | 6 | 0 |
| 1990 | 3 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 1 | 0 |
| 1994 | 4 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 3 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 4 | 3 |
| 2002 | 5 | 1 |
| 2003 | 2 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 4 |
| 2007 | 1 | 1 |
| 2008 | 2 | 3 |
| 2009 | 1 | 2 |
| 2010 | 2 | 1 |
| 2011 | 1 | 1 |
| 2012 | 1 | 3 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 1 | 3 |
| 2016 | 1 | 7 |
| 2017 | 4 | 7 |
| 2018 | 4 | 7 |
| 2019 | 8 | 8 |
| 2020 | 9 | 9 |
| 2021 | 6 | 8 |
| 2022 | 6 | 5 |
| 2023 | 9 | 9 |
| 2024 | 10 | 5 |
| 2025 | 4 | 1 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Modular downhole tool systems with integrated hydraulic-electric actuation and intelligent flow control for coiled tubing operations14 Jul 2026US 12,680,387 B1Schlumberger Technology Corporation
- Drill bit assembly for reverse circulation hammer2 Jun 2026US 12,644,338 B2Mincon International Limited
- Methods and systems for adaptive non-contact / contact boring28 Apr 2026US 12,612,824 B2Phoenix Boring, Inc.
- Rotational speed reduction in downhole tool assemblies25 Nov 2025US 12,480,363 B2Thru Tubing Solutions, Inc.
- Apparatus and method of reducing surge when running casing4 Nov 2025US 12,460,507 B2Halliburton Energy Services.Inc.
- Drilling robot1 Jan 2026US 2026/0002414 A1ZHAW - Zürcher Hochschule Für Angewandte Wissenschaften
- Drill bit assembly for reverse circulation hammer7 Aug 2025US 2025/0250862 A1Mincon International Limited
- Threaded 2 piece bit assembly5 Dec 2024US 2024/0401412 A1Halliburton Energy Services.Inc.
- Full-hole reverse circulation cluster-type down-the-hole (DTH) hammer with multiple independent hannels23 May 2024US 2024/0167341 A1Haozhou Drilling Engineering Machinery (Shandong) Co., Ltd.
- Methods and systems for adaptive non-contact / contact boring21 Mar 2024US 2024/0093590 A1ArcByt, Inc.
Most cited
By later US patents
- Fluid operated vibratory jar with rotating bit155US 5,156,223 A1992
- Device for drilling a hole in the side wall of a bore hole136US 4,007,797 ATexas Dynamatics, Inc. · 1977
- Fluid operated vibratory jar with rotating bit128US 4,958,691 A1990
- Excavation bit for a drilling apparatus90US 6,533,050 B22003
- Self-propelled drilling head88US 4,314,615 A1982