E21C 27/02
Solely by slitting
Official title: solely by slitting (rods, drums, for same E21C25/10; saws, discs, wheels E21C25/18; chains, chain guides, for same E21C25/28)
E21C27/02 (Solely by slitting) appears on 130 US grants and 87 published applications in this corpus.
Search patents in E21C- Granted patents
- 130
- Published applications
- 87
- Assignees
- 57
- Inventors
- 209
- Latest grant
- 11 Jun 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 5 | 0 |
| 1981 | 7 | 0 |
| 1982 | 1 | 0 |
| 1983 | 7 | 0 |
| 1984 | 8 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 2 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 2 |
| 2011 | 1 | 3 |
| 2012 | 3 | 3 |
| 2013 | 2 | 5 |
| 2014 | 4 | 4 |
| 2015 | 4 | 3 |
| 2016 | 5 | 8 |
| 2017 | 8 | 13 |
| 2018 | 6 | 8 |
| 2019 | 6 | 4 |
| 2020 | 9 | 8 |
| 2021 | 9 | 9 |
| 2022 | 5 | 6 |
| 2023 | 5 | 1 |
| 2024 | 4 | 2 |
| 2025 | 0 | 3 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Cutting assembly for longwall mining system11 Jun 2024US 12,006,824 B2Joy Global Underground Mining LLC
- Cutting device and support for same26 Mar 2024US 11,939,868 B2Joy Global Underground Mining LLC
- Cable handling system for longwall mining machines12 Mar 2024US 11,927,097 B2Caterpillar Inc.
- Gas-liquid spray dust settlement system for fully mechanized mining face16 Jan 2024US 11,873,719 B2Anhui University of Science and Technology
- Cutting assembly for longwall mining system19 Sep 2023US 11,761,333 B2Joy Global Underground Mining LLC
- Method and system for monitoring coal shearer status based on digital twinning, and electronic device8 May 2025US 2025/0146413 A1Taiyuan University of Technology
- Method For Controlling A Shearer In Three Dimensions And System13 Mar 2025US 2025/0084763 A1Caterpillar Inc.
- Longwall Shearer Positioning Method, Pan for Panline, Longwall Shearer System13 Mar 2025US 2025/0084764 A1Caterpillar Inc.
- Cutting assembly for longwall mining system3 Oct 2024US 2024/0328315 A1Joy Global Underground Mining LLC
- Guide shoe for mining machine6 Jun 2024US 2024/0183272 A1Joy Global Underground Mining LLC
Most cited
By later US patents
- Mining machine with driven disc cutters44US 7,934,776 B2Joy MM Delaware, Inc. · 2011
- Mining machine with driven disc cutters23US 8,328,292 B2Joy MM Delaware, Inc. · 2012
- Mining machine with driven disc cutters21US 8,727,450 B2Joy MM Delaware, Inc. · 2014
- Mining boom linkage for separate sump and swing cutting18US 3,966,258 AJoy Manufacturing Company · 1976
- Liquid discharge apparatus for a shearing-loader type mining machine12US 4,212,497 AGebr. Eickhoff, Maschinenfabrik und Eisengiesserei m.b.H. · 1980