E21C 27/28
By percussive drills with breaking-down means
Official title: by percussive drills with breaking-down means, e.g. wedge-shaped tools
E21C27/28 (By percussive drills with breaking-down means) appears on 26 US grants and 19 published applications in this corpus.
Search patents in E21C- Granted patents
- 26
- Published applications
- 19
- Assignees
- 19
- Inventors
- 50
- Latest grant
- 29 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 3 |
| 2010 | 1 | 0 |
| 2011 | 2 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 5 |
| 2016 | 0 | 1 |
| 2017 | 0 | 2 |
| 2018 | 0 | 1 |
| 2019 | 2 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 3 |
| 2022 | 3 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Impact controller for primary rock breakage29 Apr 2025US 12,286,883 B1
- Apparatus, rock breaking machine and method of monitoring rock breaking machine19 Jul 2022US 11,391,093 B2Sandvik Mining and Construction Oy
- Rock cutting assembly3 May 2022US 11,319,754 B2Joy Global Underground Mining LLC
- Rock cutting assembly15 Mar 2022US 11,274,497 B2Joy Global Underground Mining LLC
- Non-concentric protruding shaft fixed bearing reciprocating impact part for implementing reciprocating impact part non-concentric protruding shaft fixed bearing method3 Sep 2019US 10,400,597 B2
- Apparatus, rock breaking machine and method of monitoring rock breaking machine30 Sep 2021US 2021/0301594 A1Sandvik Mining and Construction Oy
- Advance and Retreat Automatic Control Method Based on Hydraulic Sensing Conversion and Advance and Retreat Automatic Control System Based on Hydraulic Sensing Conversion27 May 2021US 2021/0156250 A1
- Reciprocating impact bevel tooth discharging shovel of reciprocating impact mining machine13 May 2021US 2021/0140316 A1
- Rock cutting assembly30 Jan 2020US 2020/0032649 A1Joy Global Underground Mining LLC
- Drilling and Bursting Heading Machine12 Jul 2018US 2018/0195388 A1China University of Mining and Technology
Most cited
By later US patents
- Hammer24US 4,550,785 AConsolidated Technologies, Inc. · 1985
- Impact kerfing rock cutter and method21US 5,028,092 ACoski Enterprises, Ltd. · 1991
- Vibratory milling machine having linear reciprocating motion19US 8,079,647 B2Longyear TM, Inc. · 2011
- Continuous mining machine16US 4,363,519 AJoy Manufacturing Company · 1982
- Fluid-powered impact device and tool therefor14US 4,858,701 A1989