E21D 19/02
Provisional protective covers for working space: for use in longwall working
Official title: for use in longwall working
E21D19/02 (Provisional protective covers for working space: for use in longwall working) appears on 25 US grants and 4 published applications in this corpus.
Search patents in E21D- Granted patents
- 25
- Published applications
- 4
- Assignees
- 12
- Inventors
- 41
- Latest grant
- 16 Jul 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 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 | 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 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 0 |
| 2024 | 2 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Method of no-pillar mining with gob-entry retaining adapted for fully-mechanized top coal caving in thick coal seam16 Jul 2024US 12,037,905 B2China University of Mining and Technology, Beijing
- Swing arm plow apparatuses and methods4 Jun 2024US 12,000,284 B1
- Longwall mine construction method N003 Dec 2019US 10,494,924 B2
- Apparatus, system, and method for supporting a gate entry for underground full extraction mining19 Feb 2008US 7,331,735 B2
- Toggle type temporary roof support for mining machinery17 Jul 1984US 4,460,294 ASchroeder Brothers Corporation
- Rebar carriage for the construction of concrete structures3 Jul 2025US 2025/0215707 A1Grupo Empresarial Tecozam SL
- Method of no-pillar mining with gob-entry retaining adapted for fully-mechanized top coal caving in thick coal seam1 Sep 2022US 2022/0275726 A1China University of Mining and Technology, Beijing
- Longwall mine construction method n005 Jul 2018US 2018/0187547 A1
- Apparatus, system, and method for supporting a gate entry for underground full extraction mining20 Jul 2006US 2006/0158017 A1
Most cited
By later US patents
- Pivotal roof bolter and extendable rotatable protective canopy for mining machine22US 4,297,057 ADresser Industries, Inc. · 1981
- Mine roof support for a mobile drilling machine19US 4,079,792 AMining Equipment Division, a division of FMC Corporation · 1978
- Methods of and apparatus for applying roof mats to mine workings16US 4,122,682 A1978
- Method and apparatus for supporting the roof of an underground mine working14US 4,099,785 A1978
- Vehicle mounted temporary roof support13US 4,252,475 ASchroeder Brothers Corporation · 1981