E21D 19/04
Provisional protective covers for working space: for use in drifting galleries
Official title: for use in drifting galleries
E21D19/04 (Provisional protective covers for working space: for use in drifting galleries) appears on 25 US grants and 14 published applications in this corpus.
Search patents in E21D- Granted patents
- 25
- Published applications
- 14
- Assignees
- 27
- Inventors
- 61
- Latest grant
- 15 Feb 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 2 | 0 |
| 1987 | 3 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 1 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 2 |
| 2014 | 2 | 0 |
| 2015 | 0 | 2 |
| 2016 | 0 | 2 |
| 2017 | 2 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 2 |
| 2020 | 2 | 1 |
| 2021 | 0 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Method of treating tunnel collapse with roof-contacted shield support15 Feb 2022US 11,248,464 B2China Communications Construction Co., Ltd.
- Active temporary roof support apparatus27 Oct 2020US 10,815,781 B2Sandvik Intellectual Property AB
- Drill and blast method and apparatus for the same26 May 2020US 10,662,771 B2Centre for Excellence In Mining Innovation
- Drill and blast method and apparatus for the same21 Aug 2018US 10,053,984 B2Centre for Excellence In Mining Innovation
- Apparatus for forming an underground tunnel25 Apr 2017US 9,631,491 B2
- Device for providing braids, system comprising the device and method for providing braids4 Sep 2025US 2025/0277448 A1Geobrugg AG
- Rebar carriage for the construction of concrete structures3 Jul 2025US 2025/0215707 A1Grupo Empresarial Tecozam SL
- Method of treating tunnel collapse with roof-contacted shield support18 Nov 2021US 2021/0355828 A1China Communications Construction Co., Ltd.
- Rapid development mobile canopy for underground mining6 Feb 2020US 2020/0040725 A1
- Active temporary roof support apparatus23 May 2019US 2019/0153863 A1Sandvik Intellectual Property AB
Most cited
By later US patents
- Tunnel excavator with crawler drive and roof support bearing frames28US 6,206,478 B1Ishikawajima-Harima Heavy Industries Co., Ltd. · 2001
- Mining machine with detachable articulated cutting assembly16US 6,224,164 B1Joy MM Delaware, Inc. · 2001
- Automated temporary roof support system for mining equipment11US 4,595,316 A1986
- Movable roof support and bolter system11US 4,710,064 A1987
- Movable roof support and bolter system8US 4,676,697 A1987