E21C 27/22
By rotary drills with breaking-down means
Official title: by rotary drills with breaking-down means, e.g. wedge-shaped drills {, i.e. the rotary axis of the tool carrier being substantially perpendicular to the working face, e.g. MARIETTA-type (similar machines for tunneling E21D9/102)}
E21C27/22 (By rotary drills with breaking-down means) appears on 65 US grants and 33 published applications in this corpus.
Search patents in E21C- Granted patents
- 65
- Published applications
- 33
- Assignees
- 43
- Inventors
- 117
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 7 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 4 | 0 |
| 1981 | 0 | 0 |
| 1982 | 3 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 0 | 1 |
| 2009 | 2 | 0 |
| 2010 | 0 | 2 |
| 2011 | 1 | 1 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 1 | 5 |
| 2015 | 1 | 3 |
| 2016 | 3 | 3 |
| 2017 | 2 | 1 |
| 2018 | 2 | 4 |
| 2019 | 1 | 0 |
| 2020 | 2 | 1 |
| 2021 | 0 | 2 |
| 2022 | 2 | 3 |
| 2023 | 3 | 2 |
| 2024 | 3 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method and system for mining23 Sep 2025US 12,421,802 B2Novamera Inc.
- Method and system for mining9 Jul 2024US 12,031,382 B2Novamera Inc.
- Cutting device and support for same26 Mar 2024US 11,939,868 B2Joy Global Underground Mining LLC
- Disc cutter for undercutting apparatus and a method of manufacture thereof19 Mar 2024US 11,933,107 B2Sandvik Mining and Construction Tools AB
- Cutting assembly for a mining machine19 Dec 2023US 11,846,189 B2Sandvik Mining and Construction Oy
- Method and system for mining10 Oct 2024US 2024/0337161 A1Novamera Inc.
- Cutting device and support for same20 Jul 2023US 2023/0228192 A1Joy Global Underground Mining LLC
- Cutting assembly for a mining machine16 Feb 2023US 2023/0048925 A1Sandvik Mining and Construction Oy
- Method and System for Mining19 May 2022US 2022/0154567 A1Novamera 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.
Most cited
By later US patents
- Mining system and method featuring a bread loaf shaped borehole27US 6,612,655 B2Amvest Systems Inc. · 2003
- Mine drilling apparatus and method25US 4,059,163 ACaterpillar Tractor Co. · 1977
- Cutting machine22US 4,589,701 AGewerkschaft Eisenhutte Westfalia · 1986
- Drive device for rotating and oscillating a tool, and a compatible tool for mining21US 7,490,911 B2DBT GmbH · 2009
- Drag bit excavation19US 4,087,131 ARapidex, Inc. · 1978