E21C 25/00
Cutting machines, i.e. for making slits approximately parallel or perpendicular to the
Official title: Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (dislodging machines with slitting means E21C27/02, E21C27/10, E21C27/18)
E21C25/00 (Cutting machines, i.e. for making slits approximately parallel or perpendicular to the) appears on 522 US grants and 360 published applications in this corpus.
Search patents in E21C- Granted patents
- 522
- Published applications
- 360
- Assignees
- 207
- Inventors
- 853
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 13 | 0 |
| 1977 | 13 | 0 |
| 1978 | 12 | 0 |
| 1979 | 3 | 0 |
| 1980 | 15 | 0 |
| 1981 | 18 | 0 |
| 1982 | 5 | 0 |
| 1983 | 8 | 0 |
| 1984 | 12 | 0 |
| 1985 | 3 | 0 |
| 1986 | 6 | 0 |
| 1987 | 11 | 0 |
| 1988 | 10 | 0 |
| 1989 | 9 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 6 | 0 |
| 1993 | 4 | 0 |
| 1994 | 7 | 0 |
| 1995 | 8 | 0 |
| 1996 | 4 | 0 |
| 1997 | 10 | 0 |
| 1998 | 5 | 0 |
| 1999 | 5 | 0 |
| 2000 | 5 | 0 |
| 2001 | 9 | 4 |
| 2002 | 6 | 6 |
| 2003 | 4 | 7 |
| 2004 | 5 | 7 |
| 2005 | 6 | 4 |
| 2006 | 1 | 5 |
| 2007 | 5 | 5 |
| 2008 | 8 | 3 |
| 2009 | 3 | 4 |
| 2010 | 3 | 4 |
| 2011 | 2 | 6 |
| 2012 | 5 | 10 |
| 2013 | 8 | 13 |
| 2014 | 16 | 23 |
| 2015 | 18 | 26 |
| 2016 | 19 | 30 |
| 2017 | 18 | 41 |
| 2018 | 25 | 41 |
| 2019 | 49 | 16 |
| 2020 | 27 | 34 |
| 2021 | 20 | 25 |
| 2022 | 25 | 14 |
| 2023 | 15 | 8 |
| 2024 | 8 | 13 |
| 2025 | 12 | 6 |
| 2026 | 8 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21C 25/06Machines slitting solely by one or more cutting rods or cutting drums255
- E21C 25/16Machines slitting solely by one or more rotating saws, cutting discs, or100
- E21C 25/60Slitting by jets of water or other liquid86
- E21C 25/22Machines slitting solely by one or more cutter chains moving unidirectionally along38
- E21C 25/58Machines slitting by drilling hole on hole37
- E21C 25/68Machines for making slits combined with equipment for removing29
- E21C 25/56Slitting by cutter cables or cutter chains or by tools drawn along10
- E21C 25/66Machines for making slits with additional arrangements for drilling8
All 14 subgroupsShow fewer
- E21C 25/20Machines slitting solely by one or more reciprocating sawing implements or reciprocating7
- E21C 25/02Machines slitting solely by one or more percussive tools moved through the6
- E21C 25/54Slitting by unguided cutter cables or cutter chains, or by unguided tools6
- E21C 25/52Machines incorporating two or more of the slitting means according to groups3
- E21C 25/64Slitting machines guided solely by hand and either carried by hand or3
- E21C 25/62Machines for making slits approximately perpendicular to the seams either level with0
Recent patents
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- Mining vehicle for cobalt-rich crust from the seabed11 Aug 2026US 12,704,066 B2Qingdao University of Science and Technology
- Tunneling system28 Jul 2026US 12,692,790 B2Ccteg Taiyuan Research Institute
- Rolling wedge cutter drum30 Jun 2026US 12,668,933 B1
- Method and device for horizontal bore mining5 May 2026US 12,618,308 B2Iluka Resources Limited
- Rolling Wedge Cutter Drum1 Oct 2026US 2026/0297869 A1
- Mining method24 Sep 2026US 2026/0286844 A1Element Six Limited
- Intelligent adaptive monitoring and control system for high-pressure jet excavation23 Jul 2026US 2026/0210246 A1Chongqing University
- Cutting device and support for same16 Jul 2026US 2026/0201800 A1Joy Global Underground Mining LLC
- Method and material removal system14 May 2026US 2026/0132715 A1Rockfeel GmbH
Most cited
By later US patents
- Enhancing liquid jet erosion147US 4,474,251 AHydronautics, Incorporated · 1984
- Horizontal remote mining system, and method120US 5,879,057 AAmvest Corporation · 1999
- Apparatus and process for employing synergistic destructive powers of a water stream and a laser beam102US 5,356,081 AElectric Power Research Institute, Inc. · 1994
- Enhancing liquid jet erosion91US 4,389,071 AHydronautics, Incorporated · 1983
- Enhancing liquid jet erosion86US 4,681,264 AHydronautics, Incorporated · 1987