E21C 31/02
Driving means incorporated in machines for slitting or completely freeing the mineral
Official title: for cutting or breaking-down devices
E21C31/02 (Driving means incorporated in machines for slitting or completely freeing the mineral) appears on 97 US grants and 68 published applications in this corpus.
Search patents in E21C- Granted patents
- 97
- Published applications
- 68
- Assignees
- 44
- Inventors
- 176
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 5 | 0 |
| 1979 | 5 | 0 |
| 1980 | 3 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 2 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 4 |
| 2012 | 2 | 1 |
| 2013 | 1 | 1 |
| 2014 | 2 | 6 |
| 2015 | 5 | 4 |
| 2016 | 4 | 3 |
| 2017 | 1 | 10 |
| 2018 | 5 | 8 |
| 2019 | 8 | 2 |
| 2020 | 10 | 11 |
| 2021 | 6 | 7 |
| 2022 | 10 | 4 |
| 2023 | 2 | 0 |
| 2024 | 2 | 3 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Cutter head for mining machine12 Aug 2025US 12,385,395 B2Joy Global Underground Mining LLC
- Roadway/tunnel excavation robot and automatic cutting control method17 Sep 2024US 12,091,977 B2China University of Mining and Technology
- Cutting assembly for longwall mining system11 Jun 2024US 12,006,824 B2Joy Global Underground Mining LLC
- Method for removing material from a rock wall15 Aug 2023US 11,725,512 B2Joy Global Underground Mining LLC
- Self-propelled construction machine and method for operating a self- propelled construction machine14 Mar 2023US 11,603,631 B2Wirtgen GmbH
- Cutting assembly for longwall mining system3 Oct 2024US 2024/0328315 A1Joy Global Underground Mining LLC
- Roadway/tunnel excavation robot and automatic cutting control method2 May 2024US 2024/0141784 A1China University of Mining and Technology
- Cutter head for mining machine18 Apr 2024US 2024/0125232 A1Joy Global Underground Mining LLC
- Cutter head for mining machine3 Nov 2022US 2022/0349306 A1Joy Global Underground Mining LLC
- Ground milling machine with energy supply system, method for operating a ground milling machine, and method for retrofitting a ground milling machine6 Oct 2022US 2022/0316333 A1BOMAG GmbH
Most cited
By later US patents
- Oscillating disk thin seam mining machine with steering22US 4,045,088 A1977
- Cutter head for mining machine19US 9,470,087 B2Joy MM Delaware, Inc. · 2016
- Cutting head with self-contained power source18US 4,172,616 ACoaltex, Inc. · 1979
- Continuous mining machine with a chain drive for the cutting head17US 3,968,995 ADresser Industries, Inc. · 1976
- Mining machine with cutter drum having internal drive motors17US 4,047,763 AJoy Manufacturing Comapny · 1977