E21C 29/02
Propulsion of machines for slitting or completely freeing the mineral from the
Official title: by means on the machine exerting a thrust against fixed supports
E21C29/02 (Propulsion of machines for slitting or completely freeing the mineral from the) appears on 95 US grants and 33 published applications in this corpus.
Search patents in E21C- Granted patents
- 95
- Published applications
- 33
- Assignees
- 56
- Inventors
- 157
- Latest grant
- 23 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 6 | 0 |
| 1979 | 3 | 0 |
| 1980 | 10 | 0 |
| 1981 | 7 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 7 | 0 |
| 1985 | 6 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 4 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 3 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 1 | 2 |
| 2011 | 0 | 4 |
| 2012 | 2 | 5 |
| 2013 | 2 | 0 |
| 2014 | 2 | 1 |
| 2015 | 4 | 2 |
| 2016 | 2 | 2 |
| 2017 | 2 | 4 |
| 2018 | 0 | 1 |
| 2019 | 2 | 0 |
| 2020 | 3 | 2 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 1 | 3 |
| 2025 | 1 | 0 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Guide shoe for mining machine2 Apr 2026US 2026/0092521 A1Joy Global Underground Mining LLC
- Rackbar rotation limit12 Sep 2024US 2024/0301793 A1Joy Global Underground Mining LLC
- Guide shoe for mining machine18 Jul 2024US 2024/0240559 A1Joy Global Underground Mining LLC
- Guide shoe for mining machine6 Jun 2024US 2024/0183272 A1Joy Global Underground Mining LLC
- Distributed coal cutting device for longwall face of coal mine26 Oct 2023US 2023/0340877 A1Henan Polytechnic University
Most cited
By later US patents
- Rack device for a mining machine37US 4,082,361 AGebr. Eickhoff, Maschinenfabrik und Eisengiesserei m.b.H. · 1978
- Support for movable segments in a rack for a drum cutter mining machine32US 4,155,600 AGebr. Eickhoff, Maschinenfabrik und Eisengiesserei m.b.H. · 1979
- Mining machine having rectangular thrust transmitting conveyor column27US 4,014,574 ABrowning & Bushman · 1977
- Continuous miner with improved roof-to-floor anchoring canopy units for advancing and turning machine and installing roof bolts20US 4,226,476 AFairchild Incorporated · 1980
- Gear rack for a mining machine16US 4,397,199 AGebr. Eickhoff, Maschinenfabrik und Eisengiesserei m.b.H. · 1983