E21B 7/023
The mast being foldable or telescopically retractable
Official title: {the mast being foldable or telescopically retractable}
E21B7/023 (The mast being foldable or telescopically retractable) appears on 145 US grants and 153 published applications in this corpus.
Search patents in E21B- Granted patents
- 145
- Published applications
- 153
- Assignees
- 92
- Inventors
- 323
- Latest grant
- 1 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 1 |
| 2005 | 2 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 3 |
| 2008 | 1 | 4 |
| 2009 | 0 | 6 |
| 2010 | 2 | 2 |
| 2011 | 1 | 6 |
| 2012 | 3 | 3 |
| 2013 | 5 | 17 |
| 2014 | 5 | 8 |
| 2015 | 14 | 10 |
| 2016 | 7 | 12 |
| 2017 | 9 | 10 |
| 2018 | 5 | 6 |
| 2019 | 9 | 10 |
| 2020 | 15 | 9 |
| 2021 | 9 | 9 |
| 2022 | 8 | 10 |
| 2023 | 8 | 4 |
| 2024 | 6 | 10 |
| 2025 | 8 | 6 |
| 2026 | 7 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Automated drilling arrangement1 Sep 2026US 12,723,476 B2
- Drilling and bolting tool18 Aug 2026US 12,709,981 B2Joy Global Underground Mining LLC
- System for moving mast of drilling machine21 Jul 2026US 12,687,074 B2Caterpillar Inc.
- Racking board systems and methods5 May 2026US 12,618,297 B2Helmerich & Payne, Inc.
- Compact machine for carrying tools17 Mar 2026US 12,577,876 B2Pioneer Conveyor, LLC
- Derrick machine with hydraulic control system and fully radial outriggers18 Jun 2026US 2026/0168330 A1Skylift Inc.
- Rig for wellbore operations21 May 2026US 2026/0139509 A1Savanna Drilling Corp.
- Mobile rig to well securement system and method26 Feb 2026US 2026/0055670 A1
- Mobile rig to well alignment system and method26 Feb 2026US 2026/0055671 A1
- Well rig with tubing anti-buckling system and method26 Feb 2026US 2026/0055676 A1
Most cited
By later US patents
- Top drive torque restraint system154US 5,107,940 AHydratech · 1992
- Self-propelled drilling module111US 5,248,005 ANabors Industries, Inc. · 1993
- Drill rig apparatus92US 3,942,593 ACabot Corporation · 1976
- Drilling rig structure installation and methods66US 8,250,816 B2National Oilwell Varco, L. P. · 2012
- Drilling rigs and erection methods57US 8,468,753 B2National Oilwell Varco, L. P. · 2013