E21D 23/081
Forming parts of the roof supports
Official title: {forming parts of the roof supports}
E21D23/081 (Forming parts of the roof supports) appears on 61 US grants and 9 published applications in this corpus.
Search patents in E21D- Granted patents
- 61
- Published applications
- 9
- Assignees
- 32
- Inventors
- 96
- Latest grant
- 5 Sep 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 4 | 0 |
| 1978 | 11 | 0 |
| 1979 | 4 | 0 |
| 1980 | 8 | 0 |
| 1981 | 1 | 0 |
| 1982 | 4 | 0 |
| 1983 | 5 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 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 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 1 | 1 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 2 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 2 | 1 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method and device for monitoring operation of a mining machine unit5 Sep 2023US 11,746,655 B2Caterpillar Inc.
- Apparatus for protecting roof tray when gob-side entry retaining end support migrates3 Nov 2020US 10,822,949 B1China Mining & Civil New Material Science and Technology Ltd.
- Self-advancing roof support for a longwall mining system8 Sep 2020US 10,767,481 B2Caterpillar Global Mining Europe GmbH
- Longwall mining roof supports6 Jun 2017US 9,670,777 B2Joy MM Delaware, Inc.
- Apparatus for forming an underground tunnel25 Apr 2017US 9,631,491 B2
- Underground mining system and method30 Jul 2026US 2026/0218612 A1
- Method and device for monitoring operation of a mining machine unit5 May 2022US 2022/0136390 A1Caterpillar SARL
- Construction method for continuous mining machine having device continuously providing provisional roof support2 Sep 2021US 2021/0270134 A1China University of Mining and Technology
- Self-Advancing Roof Support for a Longwall Mining System13 Feb 2020US 2020/0049006 A1Caterpillar Global Mining Europe GmbH
- Mining underground formations12 Jul 2018US 2018/0195390 A1Seneca Industries Inc.
Most cited
By later US patents
- Mine roof support and method in longwall mining of thick mineral seams17US 4,065,929 AAtlantic Richfield Company · 1978
- Movable roof support mechanism12US 4,026,118 AThe United States of America as represented by the Secretary of the Interior · 1977
- Mineral mining installation12US 4,227,833 AGewerkschaft Eisenhutte Westfalia · 1980
- Mine roof support assembly8US 4,526,495 AGewerkschaft Eisenhutte Westfalia · 1985
- Mine roof support unit8US 4,600,340 AGewerkschaft Eisenhutte Westfalia · 1986