E21C 27/00
Machines which completely free the mineral from the seam
E21C27/00 (Machines which completely free the mineral from the seam) appears on 623 US grants and 381 published applications in this corpus.
Search patents in E21C- Granted patents
- 623
- Published applications
- 381
- Assignees
- 222
- Inventors
- 924
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 21 | 0 |
| 1977 | 26 | 0 |
| 1978 | 27 | 0 |
| 1979 | 18 | 0 |
| 1980 | 26 | 0 |
| 1981 | 28 | 0 |
| 1982 | 13 | 0 |
| 1983 | 19 | 0 |
| 1984 | 21 | 0 |
| 1985 | 10 | 0 |
| 1986 | 5 | 0 |
| 1987 | 13 | 0 |
| 1988 | 9 | 0 |
| 1989 | 10 | 0 |
| 1990 | 7 | 0 |
| 1991 | 2 | 0 |
| 1992 | 8 | 0 |
| 1993 | 7 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 5 | 0 |
| 1997 | 6 | 0 |
| 1998 | 8 | 0 |
| 1999 | 8 | 0 |
| 2000 | 3 | 0 |
| 2001 | 10 | 1 |
| 2002 | 2 | 5 |
| 2003 | 4 | 2 |
| 2004 | 3 | 5 |
| 2005 | 2 | 8 |
| 2006 | 3 | 5 |
| 2007 | 4 | 10 |
| 2008 | 9 | 7 |
| 2009 | 4 | 6 |
| 2010 | 8 | 19 |
| 2011 | 7 | 14 |
| 2012 | 9 | 18 |
| 2013 | 13 | 21 |
| 2014 | 22 | 32 |
| 2015 | 26 | 30 |
| 2016 | 20 | 25 |
| 2017 | 21 | 41 |
| 2018 | 20 | 34 |
| 2019 | 33 | 13 |
| 2020 | 26 | 21 |
| 2021 | 18 | 21 |
| 2022 | 15 | 13 |
| 2023 | 14 | 8 |
| 2024 | 11 | 10 |
| 2025 | 5 | 8 |
| 2026 | 5 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21C 27/20Mineral freed by means not involving slitting475
- E21C 27/02Solely by slitting130
- E21C 27/10Machines which completely free the mineral from the seam: by both slitting40
- E21C 27/01Machines which completely free the mineral from the seam: specially adapted for2
- E21C 27/18Machines which completely free the mineral from the seam: by both slitting1
Recent patents
- High power laser tunneling mining and construction equipment and methods of use25 Aug 2026US 12,715,063 B2Foro Energy, Inc.
- Mining vehicle for cobalt-rich crust from the seabed11 Aug 2026US 12,704,066 B2Qingdao University of Science and Technology
- Device for milling in particular rock and other materials2 Jun 2026US 12,644,383 B2CONTEC—Maschinenbau—& Entwicklungstechnik GmbH
- Rackbar rotation limit24 Mar 2026US 12,584,409 B2Joy Global Underground Mining LLC
- Tunnel tunneling system3 Mar 2026US 12,565,837 B2Ccteg Taiyuan Research Institute
- Underground mining system and method30 Jul 2026US 2026/0218612 A1
- Method for controlling automatic operation of mining electric shovel considering sudden load variations during excavations2 Jul 2026US 2026/0185445 A1China University of Mining and Technology
- Integrated rapid excavation equipment for rock roadways and method thereof28 May 2026US 2026/0146533 A1China University of Mining and Technology
- Method and material removal system14 May 2026US 2026/0132715 A1Rockfeel GmbH
- Roadheader and cutter head therefor9 Oct 2025US 2025/0314172 A1Sandvik Mining and Construction Oy
Most cited
By later US patents
- Apparatus for extracting minerals through a borehole81US 4,278,137 AStamicarbon B. V. · 1981
- Apparatus and method for continuous mining45US 5,112,111 AAddington Resources, Inc. · 1992
- Rolling assembly and pick assembly mounted on a trencher44US 7,681,338 B22010
- Mining machine with driven disc cutters44US 7,934,776 B2Joy MM Delaware, Inc. · 2011
- Method and apparatus for a rotating cutting drum or arm mounted with paired opposite circular polarity antennas and resonant microstrip patch transceiver for measuring coal, trona and potash layers forward, side and around a continuous mining machine43US 5,769,503 AStolar, Inc. · 1998