E21D 21/0006
Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
Official title: {characterised by the bolt material}
E21D21/0006 (Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection) appears on 59 US grants and 59 published applications in this corpus.
Search patents in E21D- Granted patents
- 59
- Published applications
- 59
- Assignees
- 49
- Inventors
- 145
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 3 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 4 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 2 |
| 2008 | 1 | 3 |
| 2009 | 0 | 1 |
| 2010 | 2 | 3 |
| 2011 | 2 | 3 |
| 2012 | 1 | 5 |
| 2013 | 1 | 2 |
| 2014 | 2 | 1 |
| 2015 | 2 | 5 |
| 2016 | 3 | 3 |
| 2017 | 0 | 1 |
| 2018 | 4 | 6 |
| 2019 | 4 | 3 |
| 2020 | 1 | 3 |
| 2021 | 4 | 6 |
| 2022 | 4 | 2 |
| 2023 | 2 | 3 |
| 2024 | 0 | 1 |
| 2025 | 2 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Bolter2 Jun 2026US 12,644,385 B2Joy Global Underground Mining LLC
- Hollow rod composite anchor with improved setting capability and method for setting a hollow rod composite anchor into a rock stratum5 Aug 2025US 12,378,886 B2Jmbg GmbH + Co KG
- Bolter6 May 2025US 12,291,968 B2Joy Global Underground Mining LLC
- Bolter10 Oct 2023US 11,781,430 B2Joy Global Underground Mining LLC
- Bolter15 Aug 2023US 11,725,514 B2Joy Global Underground Mining LLC
- Bolter24 Sep 2026US 2026/0286845 A1Joy Global Underground Mining LLC
- Bolter14 Aug 2025US 2025/0257658 A1Joy Global Underground Mining LLC
- Prefabricated tunnel prestressed anchor and manufacturing method and use method therefor8 May 2025US 2025/0146415 A1Cccc Second Highway Consultants Co., Ltd.
- Rock bolt20 Mar 2025US 2025/0092787 A1Msp Mine Support Products (Pty) Ltd
- Carbon Fiber Rock Bolt30 May 2024US 2024/0175360 A1CMTE Development Limited
Most cited
By later US patents
- Flexible rock anchor34US 4,798,501 ARudolf Hausherr & Sohne GmbH & Co. KG · 1989
- Cable sling for support and stabilization of underground openings33US 4,265,571 AMidcontinent Specialties Manufacturing, Inc. · 1981
- Mining roof bolt29US 4,472,088 A1984
- Friction rock stabilizer and sheathing means, in combination, and method of securing a friction rock stabilizer in an earth bore29US 4,490,074 AIngersoll-Rand Company · 1984
- Mine roof bolt and end cap26US 4,307,979 APPG Industries, Inc. · 1981