E21D 9/02
Driving inclined tunnels or galleries
E21D9/02 (Driving inclined tunnels or galleries) appears on 9 US grants and 8 published applications in this corpus.
Search patents in E21D- Granted patents
- 9
- Published applications
- 8
- Assignees
- 9
- Inventors
- 34
- Latest grant
- 13 Jun 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 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 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 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 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 2 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 2 | 2 |
| 2020 | 0 | 1 |
| 2021 | 1 | 1 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Split air cabin ventilation system for construction of tunnel inclined shaft and ventilation method using same13 Jun 2023US 11,674,392 B2Chang An University
- Directional drilling apparatus using water hammer unit27 Apr 2021US 10,988,986 B2
- Hydro-electric site and method for constructing a penstock26 Nov 2019US 10,486,717 B2Minrail Inc.
- Mining site having a shallow angle extraction shaft, shallow angle mining method and method for constructing a penstock5 Feb 2019US 10,196,072 B2Minrail Inc.
- Overhead rail system having chariots moving longitudinally along the rail system10 Jul 2018US 10,017,190 B2Minrail Inc.
- Secondary shaft completion construction method based on raise boring process1 Oct 2026US 2026/0298085 A1China Three Gorges Construction Engineering Corporation
- Split air cabin ventilation system for construction of tunnel inclined shaft and ventilation method using same8 Jul 2021US 2021/0207481 A1Chang An University
- Directional drilling apparatus using water hammer unit12 Mar 2020US 2020/0080378 A1
- System and Method for Preventing an Explosion of a Caldera8 Aug 2019US 2019/0242255 A1
- Hydro-electric site and method for constructing a penstock30 May 2019US 2019/0161094 A1Minrail Inc.
Most cited
By later US patents
- Tunnel excavator6US 5,931,601 AKomatsu Ltd. · 1999
- Tunneling apparatus5US 9,506,344 B2Vermeer Manufacturing Company · 2016
- Mining site having a shallow angle extraction shaft, shallow angle mining method and method for constructing a penstock1US 10,196,072 B2Minrail Inc. · 2019
- Working platform for a drilling apparatus1US 4,527,640 AOy Tampella AB · 1985