E21F 13/04
Transport of mined material in gravity inclines
Official title: {Transport of mined material} in gravity inclines; in staple or inclined shafts
E21F13/04 (Transport of mined material in gravity inclines) appears on 48 US grants and 38 published applications in this corpus.
Search patents in E21F- Granted patents
- 48
- Published applications
- 38
- Assignees
- 39
- Inventors
- 125
- Latest grant
- 31 Dec 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 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 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 1 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 3 |
| 2010 | 1 | 0 |
| 2011 | 1 | 2 |
| 2012 | 1 | 3 |
| 2013 | 3 | 2 |
| 2014 | 1 | 4 |
| 2015 | 0 | 2 |
| 2016 | 0 | 2 |
| 2017 | 2 | 2 |
| 2018 | 3 | 3 |
| 2019 | 2 | 0 |
| 2020 | 1 | 2 |
| 2021 | 3 | 3 |
| 2022 | 2 | 3 |
| 2023 | 3 | 1 |
| 2024 | 2 | 1 |
| 2025 | 0 | 2 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Track structure with center rail31 Dec 2024US 12,179,809 B2RIINO Inc.
- Pumping system26 Nov 2024US 12,152,608 B2Weir Minerals Netherlands B.V.
- Track structure with hollow center rail usable as ventilation duct7 Nov 2023US 11,807,279 B2RIINO Inc.
- Apparatus and methods for hydrocarbon recovery22 Aug 2023US 11,732,567 B2Drift Resource Technologies Inc
- Transport and hoisting of slurry7 Mar 2023US 11,597,613 B2Hydro Power Equipment (Pty) Ltd.
- Wellbore controllable chamber-forming granular-flow mining system6 Aug 2026US 2026/0226817 A1Blueland Technology Limited
- Modular platform system for vertical ore stope mining11 Sep 2025US 2025/0283408 A1Nordic Minesteel Technologies Inc.
- Continuous actuator driven material handling system for vertical and inclined shafts12 Jun 2025US 2025/0188840 A1Nordic Minesteel Technologies Inc.
- Track structure with center rail28 Mar 2024US 2024/0101162 A1RIINO Inc.
- Track structure with hollow center rail usable as ventilation duct7 Sep 2023US 2023/0278596 A1RIINO Inc.
Most cited
By later US patents
- Method and system for winning minerals69US 3,961,824 A1976
- Coal mining apparatus and method19US 3,951,459 A1976
- Control system for positioning extensible pipeline system9US 3,961,772 AContinental Oil Company · 1976
- Mechanical drive system for a remote area9US 4,041,785 A1977
- Hydraulic mining apparatus and method8US 4,061,398 AKaiser Resources Ltd. · 1977