E21F 13/042
Vertical hydraulic conveying of coal
Official title: {Vertical hydraulic conveying of coal (conveying by water flow in general B65G53/00)}
E21F13/042 (Vertical hydraulic conveying of coal) appears on 24 US grants and 12 published applications in this corpus.
Search patents in E21F- Granted patents
- 24
- Published applications
- 12
- Assignees
- 14
- Inventors
- 48
- Latest grant
- 26 Nov 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 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 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 2 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 0 | 2 |
| 2016 | 0 | 0 |
| 2017 | 1 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 1 | 1 |
| 2021 | 1 | 2 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Pumping system26 Nov 2024US 12,152,608 B2Weir Minerals Netherlands B.V.
- Transport and hoisting of slurry7 Mar 2023US 11,597,613 B2Hydro Power Equipment (Pty) Ltd.
- System for extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity2 Mar 2021US 10,934,817 B2China University of Mining and Technology
- Hydraulic hoisting system and method14 Jan 2020US 10,532,897 B2Cementation Canada Inc.
- Apparatus and method for storing waste material10 Jan 2017US 9,540,929 B2
- Transport and hoisting of slurry2 Dec 2021US 2021/0371216 A1Hydro Power Equipment (Pty) Ltd.
- Pumping System23 Sep 2021US 2021/0293255 A1Weir Minerals Netherlands B.V.
- System for extracting gas from tectonically-deformed coal seam in-situ by depressurizing horizontal well cavity29 Oct 2020US 2020/0340335 A1China University of Mining and Technology
- Hydraulic hoisting system and method27 Jul 2017US 2017/0210573 A1Cementation Canada Inc.
- Apparatus and method for storing waste material12 Nov 2015US 2015/0322788 A9
Most cited
By later US patents
- Method and system for winning minerals69US 3,961,824 A1976
- Control system for positioning extensible pipeline system9US 3,961,772 AContinental Oil Company · 1976
- Hydraulic mining apparatus and method8US 4,061,398 AKaiser Resources Ltd. · 1977
- Multi-level hydraulic mining system5US 3,993,354 A1976
- Method and apparatus for mining5US 4,079,999 AKaiser Resources Ltd. · 1978