E21C 29/22
Propulsion of machines for slitting or completely freeing the mineral from the
Official title: by wheels, endless tracks or the like {(propulsion using fixed racks along which the machine is running E21C29/02)}
E21C29/22 (Propulsion of machines for slitting or completely freeing the mineral from the) appears on 53 US grants and 53 published applications in this corpus.
Search patents in E21C- Granted patents
- 53
- Published applications
- 53
- Assignees
- 32
- Inventors
- 99
- Latest grant
- 23 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 2 |
| 2013 | 0 | 2 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 3 |
| 2017 | 2 | 9 |
| 2018 | 1 | 8 |
| 2019 | 10 | 2 |
| 2020 | 7 | 7 |
| 2021 | 4 | 4 |
| 2022 | 6 | 5 |
| 2023 | 4 | 3 |
| 2024 | 2 | 3 |
| 2025 | 4 | 2 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Method and system for mining23 Sep 2025US 12,421,802 B2Novamera Inc.
- Mine material processing apparatus including gas spring wheel assemblies and related methods3 Jun 2025US 12,319,090 B2Gacw Incorporated
- Milling machine and process for the operation of a milling machine27 May 2025US 12,312,955 B2Wirtgen GmbH
- Systems and methods for non-contact boring14 Jan 2025US 12,196,082 B2Phoenix Boring, Inc.
- Mining system19 Nov 2024US 12,146,409 B2Underground Extraction Technologies Pty LTD
- Roadheader and cutter head therefor9 Oct 2025US 2025/0314172 A1Sandvik Mining and Construction Oy
- Systems And Methods For Non-Contact Boring27 Feb 2025US 2025/0067176 A1Phoenix Boring, Inc.
- Method and system for mining10 Oct 2024US 2024/0337161 A1Novamera Inc.
- A cutting head assembly19 Sep 2024US 2024/0309761 A1Optima Mining Systems Pty Ltd
- Mining machine and method for controlling movement of a movable element of a mining machine4 Apr 2024US 2024/0110477 A1Sandvik Mining and Construction Oy
Most cited
By later US patents
- Continuous mining machine16US 4,363,519 AJoy Manufacturing Company · 1982
- Mining machine having advancing mine roof supports13US 4,131,317 AConsolidation Coal Company · 1978
- Mining machine with multiple propulsion members13US 5,795,032 AJoy MM Delaware, Inc. · 1998
- Mining equipment9US 4,315,658 ACoal Industry (Patents) Limited · 1982
- Systems and methods for non-contact boring7US 11,492,904 B2ArcByt, Inc. · 2022