E21D 20/00
Setting anchoring-bolts
Official title: Setting anchoring-bolts (anchoring bolts for shafts, tunnels or galleries E21D21/00; means for anchoring structural elements or bulkheads specially adapted to foundation engineering E02D5/74; dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose F16B13/00)
E21D20/00 (Setting anchoring-bolts) appears on 728 US grants and 474 published applications in this corpus.
Search patents in E21D- Granted patents
- 728
- Published applications
- 474
- Assignees
- 335
- Inventors
- 1,321
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 17 | 0 |
| 1978 | 22 | 0 |
| 1979 | 20 | 0 |
| 1980 | 20 | 0 |
| 1981 | 28 | 0 |
| 1982 | 26 | 0 |
| 1983 | 15 | 0 |
| 1984 | 13 | 0 |
| 1985 | 24 | 0 |
| 1986 | 11 | 0 |
| 1987 | 21 | 0 |
| 1988 | 19 | 0 |
| 1989 | 13 | 0 |
| 1990 | 9 | 0 |
| 1991 | 14 | 0 |
| 1992 | 10 | 0 |
| 1993 | 9 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 10 | 0 |
| 1997 | 5 | 0 |
| 1998 | 10 | 0 |
| 1999 | 7 | 0 |
| 2000 | 10 | 0 |
| 2001 | 8 | 3 |
| 2002 | 14 | 4 |
| 2003 | 7 | 12 |
| 2004 | 11 | 9 |
| 2005 | 4 | 12 |
| 2006 | 11 | 13 |
| 2007 | 4 | 15 |
| 2008 | 15 | 15 |
| 2009 | 10 | 15 |
| 2010 | 13 | 21 |
| 2011 | 4 | 18 |
| 2012 | 9 | 25 |
| 2013 | 15 | 13 |
| 2014 | 20 | 24 |
| 2015 | 20 | 40 |
| 2016 | 18 | 16 |
| 2017 | 17 | 26 |
| 2018 | 12 | 28 |
| 2019 | 33 | 18 |
| 2020 | 24 | 27 |
| 2021 | 23 | 29 |
| 2022 | 19 | 13 |
| 2023 | 14 | 28 |
| 2024 | 11 | 25 |
| 2025 | 19 | 12 |
| 2026 | 16 | 13 |
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
- Tunnel constraint anchor cable and method for improving stability of initial support structure14 Jul 2026US 12,680,451 B2Chang An University
- 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.
- 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
- "stress-displacement" intelligent early warning method for roof disaster23 Jul 2026US 2026/0210250 A1Guizhou University
- Bolting head, bolting rig and method9 Jul 2026US 2026/0193985 A1Sandvik Mining and Construction Oy
Most cited
By later US patents
- Method of rock bolting and rock bolt122US 4,511,289 AAtlas Copco Aktiebolag · 1985
- Method and installation apparatus for rock bolting121US 4,423,986 AAtlas Copco Aktiebolag · 1984
- Retractable bit guide for a drilling and bolting slide72US 4,472,002 AEimco-Secoma Societe Anonyme · 1984
- Organic grouting composition for anchoring a bolt in a hole60US 4,280,943 AE. I. Du Pont de Nemours and Company · 1981
- Squirt cartridge for mixing and dispensing a two-component mass56US 4,676,406 AUpat GmbH & Co. · 1987