E21D 9/113
Having a central part for making a pilot tunnel and a follow-up
Official title: {having a central part for making a pilot tunnel and a follow-up part for enlarging the pilot tunnel (E21D9/115 takes precedence; similar apparatus for enlarging drilled boreholes E21B7/28)}
E21D9/113 (Having a central part for making a pilot tunnel and a follow-up) appears on 6 US grants and 7 published applications in this corpus.
Search patents in E21D- Granted patents
- 6
- Published applications
- 7
- Assignees
- 6
- Inventors
- 34
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 0 |
| 2025 | 2 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Rock-piercing flexible rock drilling robot and rock breaking method12 Aug 2025US 12,385,391 B2Central South University
- Rotary digging drill and amphibious tunnel construction robot using same29 Apr 2025US 12,286,884 B2Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
- Tunnel boring machine20 Sep 2022US 11,448,069 B2
- Unmanned intelligent mining machine15 Nov 2016US 9,494,036 B2
- Device for advancing drillings in the ground9 Feb 2010US 7,658,244 B2Wirth Maschinen-und Bohrgerate-Fabrik GmbH
- Rotary digging drill and amphibious tunnel construction robot using same3 Apr 2025US 2025/0109689 A1Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
- Rock-piercing flexible rock drilling robot and rock breaking method23 Feb 2023US 2023/0059714 A1Central South University
- Tunnel Boring Machine20 May 2021US 2021/0148230 A1
- Unmanned intelligent mining machine1 Oct 2015US 2015/0275665 A1
- Full-cut heading machine17 Dec 2009US 2009/0309409 A1Sandvik Mining and Construction Oy
Most cited
By later US patents