E21C 25/66
Machines for making slits with additional arrangements for drilling
E21C25/66 (Machines for making slits with additional arrangements for drilling) appears on 8 US grants and 7 published applications in this corpus.
Search patents in E21C- Granted patents
- 8
- Published applications
- 7
- Assignees
- 4
- Inventors
- 36
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
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| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 2 | 1 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 2 | 2 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- High power laser tunneling mining and construction equipment and methods of use25 Aug 2026US 12,715,063 B2Foro Energy, Inc.
- Six-arm tunneling and anchoring machine for integrating tunneling and anchoring4 Apr 2023US 11,619,131 B2Lang Fang Jing Long Grand Industrial Machinery Co., Ltd.
- High power laser tunneling mining and construction equipment and methods of use28 Feb 2023US 11,590,606 B2Foro Energy, Inc.
- Mining machine applicable to fluidized mining of ore bodies and mining method1 Mar 2022US 11,261,732 B2China University of Mining and Technology, Beijing
- Drilling and bursting heading machine19 Mar 2019US 10,233,755 B2China University of Mining and Technology
- Six-Arm Tunneling and Anchoring Machine30 Nov 2023US 2023/0383651 A1Lang Fang Jing Long Grand Industrial Machinery Co., Ltd.
- High power laser tunneling mining and construction equipment and methods of use12 Oct 2023US 2023/0321749 A1Foro Energy, Inc.
- Six-Arm Tunneling and Anchoring Machine for Integrating Tunneling and Anchoring24 Mar 2022US 2022/0090498 A1Lang Fang Jing Long Grand Industrial Machinery Co., Ltd.
- Mining machine applicable to fluidized mining of ore bodies and mining method14 Oct 2021US 2021/0317739 A1China University of Mining and Technology, Beijing
- High power laser tunneling mining and construction equipment and methods of use8 Aug 2019US 2019/0240770 A1Foro Energy, Inc.
Most cited
By later US patents
- High power laser tunneling mining and construction equipment and methods of use3US 10,195,687 B2Foro Energy, Inc. · 2019
- Method and apparatus for boring and shearing of rocks2US 5,836,658 A1998
- Drilling and bursting heading machine1US 10,233,755 B2China University of Mining and Technology · 2019
- Pre-bolting system for underground mines1US 4,653,810 A1987