E21D 23/0481
Supports specially adapted for use in combination with the placing of filling-up
Official title: {Supports specially adapted for use in combination with the placing of filling-up materials (placing filling-up materials in underground workings per se E21F15/00)}
E21D23/0481 (Supports specially adapted for use in combination with the placing of filling-up) appears on 17 US grants and 7 published applications in this corpus.
Search patents in E21D- Granted patents
- 17
- Published applications
- 7
- Assignees
- 17
- Inventors
- 52
- Latest grant
- 11 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 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 | 0 | 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 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 1 | 1 |
| 2017 | 0 | 1 |
| 2018 | 1 | 2 |
| 2019 | 1 | 2 |
| 2020 | 2 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Coal-based solid waste transport and filling integrated machine mining system and method11 Nov 2025US 12,467,362 B2Anhui University of Science and Technology
- Equipment system for no-roadway no-coal-pillar retained roadway mining method18 May 2021US 11,008,860 B2Manchao HE
- Mine roof support, pre-installation assembly for same, and method of installation3 Nov 2020US 10,822,948 B2Burrell Mining Products, Inc.
- Method for recovering room-mining coal pillars by solid filling in synergy with artificial pillars7 Apr 2020US 10,612,378 B2China University of Mining and Technology
- Method for designing supporting parameters of transition support for mixed mining face of filling and fully-mechanized mining28 May 2019US 10,301,939 B2China Pingmei Shenma Energy and Chemical Industry Group Co., LTD
- Coal-based solid waste transport and filling integrated machine mining system and method30 Nov 2023US 2023/0383653 A1Western Digital Technologies, Inc.
- Method for recovering room-mining coal pillars by solid filling in synergy with artificial pillars3 Oct 2019US 2019/0301283 A1China University of Mining and Technology
- Mine roof support, pre-installation assembly for same, and method of installation4 Jul 2019US 2019/0203597 A1Burrell Mining Products, Inc.
- Method for designing supporting parameters of transition support for mixed mining face of filling and fully-mechanized mining1 Nov 2018US 2018/0314770 A1China University of Mining and Technology
- Equipment system for no-roadway no-coal-pillar retained roadway mining method5 Jul 2018US 2018/0187548 A1
Most cited
By later US patents
- Mine roof support assembly20US 4,217,067 AGewerkschaft Eisenhutte Westfalia · 1980
- Mining method and apparatus15US 4,102,550 APeabody Coal Company · 1978
- Continuous mining linear advance system6US 5,567,018 ACyprus Amax Minerals Company · 1996
- Mine roof supports5US 4,041,714 AGullick Dobson Limited · 1977
- Equipment system for no-roadway no-coal-pillar retained roadway mining method3US 11,008,860 B2Manchao HE · 2021