E21D 20/003
Machines for drilling anchor holes and setting anchor bolts
Official title: {Machines for drilling anchor holes and setting anchor bolts}
E21D20/003 (Machines for drilling anchor holes and setting anchor bolts) appears on 291 US grants and 218 published applications in this corpus.
Search patents in E21D- Granted patents
- 291
- Published applications
- 218
- Assignees
- 145
- Inventors
- 556
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 10 | 0 |
| 1978 | 11 | 0 |
| 1979 | 6 | 0 |
| 1980 | 7 | 0 |
| 1981 | 7 | 0 |
| 1982 | 7 | 0 |
| 1983 | 4 | 0 |
| 1984 | 5 | 0 |
| 1985 | 3 | 0 |
| 1986 | 5 | 0 |
| 1987 | 5 | 0 |
| 1988 | 7 | 0 |
| 1989 | 3 | 0 |
| 1990 | 4 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 6 | 0 |
| 1999 | 3 | 0 |
| 2000 | 5 | 0 |
| 2001 | 3 | 0 |
| 2002 | 4 | 2 |
| 2003 | 3 | 5 |
| 2004 | 7 | 3 |
| 2005 | 2 | 6 |
| 2006 | 2 | 8 |
| 2007 | 3 | 8 |
| 2008 | 11 | 9 |
| 2009 | 4 | 3 |
| 2010 | 8 | 8 |
| 2011 | 1 | 5 |
| 2012 | 1 | 7 |
| 2013 | 5 | 2 |
| 2014 | 6 | 11 |
| 2015 | 12 | 24 |
| 2016 | 10 | 11 |
| 2017 | 7 | 15 |
| 2018 | 8 | 13 |
| 2019 | 15 | 7 |
| 2020 | 10 | 15 |
| 2021 | 14 | 11 |
| 2022 | 8 | 6 |
| 2023 | 8 | 13 |
| 2024 | 4 | 12 |
| 2025 | 7 | 3 |
| 2026 | 10 | 11 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Drilling and bolting tool18 Aug 2026US 12,709,981 B2Joy Global Underground Mining LLC
- Tunneling system28 Jul 2026US 12,692,790 B2Ccteg Taiyuan Research Institute
- Autonomous roof bolter with sensor and related methods16 Jun 2026US 12,655,761 B2J.H. Fletcher & Co.
- Dual-power hydraulic roof bolter16 Jun 2026US 12,655,762 B2Hebei Jinglong Intelligent Equipment Co., Ltd.
- Bolter2 Jun 2026US 12,644,385 B2Joy Global Underground Mining LLC
- Bolter24 Sep 2026US 2026/0286845 A1Joy Global Underground Mining LLC
- Drill Head Injection System for a Self-Drilling Rock Bolt Assembly10 Sep 2026US 2026/0266179 A1Oka Rock Bolt Technologies Pty Limited
- Underground mining system and method30 Jul 2026US 2026/0218612 A1
- Bolting head, bolting rig and method9 Jul 2026US 2026/0193985 A1Sandvik Mining and Construction Oy
- Integrated rapid excavation equipment for rock roadways and method thereof28 May 2026US 2026/0146533 A1China University of Mining and Technology
Most cited
By later US patents
- Retractable bit guide for a drilling and bolting slide72US 4,472,002 AEimco-Secoma Societe Anonyme · 1984
- Roof bolter and process45US 4,398,850 ACopper Range Company · 1983
- Device for setting a rock bolt45US 5,114,279 AAtlas Copco Construction and Mining Technique AB · 1992
- Automatic roof bolting system for mines43US 4,229,124 AJoy Manufacturing Company · 1980
- Rock bolting apparatus42US 4,226,559 AAtlas Copco Aktiebolag · 1980