E21B 29/06
Cutting windows
Official title: Cutting windows, e.g. directional window cutters for whipstock operations ({E21B29/005 and} E21B29/08 take precedence)
E21B29/06 (Cutting windows) appears on 533 US grants and 422 published applications in this corpus.
Search patents in E21B- Granted patents
- 533
- Published applications
- 422
- Assignees
- 127
- Inventors
- 759
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 4 | 0 |
| 1994 | 6 | 0 |
| 1995 | 13 | 0 |
| 1996 | 10 | 0 |
| 1997 | 10 | 0 |
| 1998 | 33 | 0 |
| 1999 | 19 | 0 |
| 2000 | 30 | 0 |
| 2001 | 18 | 7 |
| 2002 | 12 | 17 |
| 2003 | 16 | 16 |
| 2004 | 14 | 10 |
| 2005 | 14 | 13 |
| 2006 | 10 | 8 |
| 2007 | 7 | 8 |
| 2008 | 7 | 16 |
| 2009 | 12 | 13 |
| 2010 | 8 | 17 |
| 2011 | 11 | 16 |
| 2012 | 15 | 16 |
| 2013 | 18 | 25 |
| 2014 | 12 | 16 |
| 2015 | 12 | 21 |
| 2016 | 23 | 26 |
| 2017 | 13 | 12 |
| 2018 | 16 | 24 |
| 2019 | 19 | 9 |
| 2020 | 18 | 24 |
| 2021 | 26 | 21 |
| 2022 | 24 | 16 |
| 2023 | 18 | 17 |
| 2024 | 13 | 19 |
| 2025 | 21 | 22 |
| 2026 | 18 | 13 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Downhole tool including related lug slots and lugs for coupling a milling tool and whipstock assembly6 Oct 2026US 12,753,666 B2Halliburton Energy Services.Inc.
- Two pass window milling system that can be deployed and operated in one trip6 Oct 2026US 12,753,668 B2Halliburton Energy Services.Inc.
- Robotic hydro-excavation devices15 Sep 2026US 12,735,947 B2Nova Dynamics, LLC
- Apparatus and method for milling openings in an uncemented blank pipe8 Sep 2026US 12,729,612 B2Saudi Arabian Oil Company
- 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.
- Alignable guidance device for casing entry milling and cementing operations24 Sep 2026US 2026/0286789 A1Scientific Drilling International, Inc.
- Systems for Generating Energy from Geothermal Sources and Methods of Operating and Constructing Same24 Sep 2026US 2026/0287213 A1Roda Energy Corporation
- Hydraulically actuated connection for downhole tools10 Sep 2026US 2026/0266152 A1Wellbore Integrity Solutions LLC
- Milling assembly for drilling a multilateral wellbore10 Sep 2026US 2026/0266176 A1Halliburton Energy Services.Inc.
- A downhole tool system, method, and borehole system13 Aug 2026US 2026/0235006 A1Baker Hughes Oilfield Operations LLC
Most cited
By later US patents
- Expandable wellbore junction301US 6,135,208 AHalliburton Energy Services.Inc. · 2000
- Well system221US 6,296,066 B1Halliburton Energy Services.Inc. · 2001
- Expandable wellbore junction201US 6,189,616 B1Halliburton Energy Services.Inc. · 2001
- Completing horizontal drain holes from a vertical well195US 5,301,760 ANatural Reserves Group, Inc. · 1994
- Wellbore milling and drilling190US 5,887,655 AWeatherford/Lamb, Inc. · 1999