E21D 9/08
With additional boring or cutting means other than the conventional cutting edge
Official title: with additional boring or cutting means {other than the conventional cutting edge of the shield}
E21D9/08 (With additional boring or cutting means other than the conventional cutting edge) appears on 136 US grants and 51 published applications in this corpus.
Search patents in E21D- Granted patents
- 136
- Published applications
- 51
- Assignees
- 93
- Inventors
- 339
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 8 | 0 |
| 1978 | 3 | 0 |
| 1979 | 4 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 4 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 7 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 4 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 3 |
| 2003 | 2 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 2 |
| 2006 | 3 | 0 |
| 2007 | 0 | 3 |
| 2008 | 2 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 2 |
| 2011 | 0 | 0 |
| 2012 | 2 | 1 |
| 2013 | 1 | 2 |
| 2014 | 0 | 5 |
| 2015 | 5 | 1 |
| 2016 | 2 | 1 |
| 2017 | 1 | 1 |
| 2018 | 2 | 2 |
| 2019 | 1 | 4 |
| 2020 | 3 | 0 |
| 2021 | 2 | 6 |
| 2022 | 5 | 5 |
| 2023 | 6 | 6 |
| 2024 | 5 | 1 |
| 2025 | 1 | 0 |
| 2026 | 2 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- High power laser tunneling mining and construction equipment and methods of use25 Aug 2026US 12,715,063 B2Foro Energy, Inc.
- Cutting wheel for a cutting boring machine7 Apr 2026US 12,595,734 B2Herrenknecht AG
- Automatic scanning system for tunnel walls constructed by open-type TBM4 Feb 2025US 12,216,469 B2Beijing Research Institute of Uranium Geology
- Excavation tool replacement device and tunnel boring machine20 Aug 2024US 12,065,932 B2Underground Infrastructure Technologies Corporation
- Hypergravity model test device and method for simulating progressive failure of shield tunnel face16 Jul 2024US 12,037,907 B2Powerchina Huadong Engineering Corporation Limited
- Travel device, tunnel boring machine, trailing car, transport vehicle, tunnel boring system, and movement method23 Jul 2026US 2026/0210247 A1Komatsu Ltd.
- Steering control device of shield tbm and steering control method using the same7 May 2026US 2026/0125980 A1Korea Institute of Civil Engineering and Building Technology
- Tunnel boring machine12 Feb 2026US 2026/0043331 A1Herrenknecht AG
- Shield cutterhead for cutting diaphragm wall with steel i-beam29 Jan 2026US 2026/0028910 A1China Railway First Group Urban Track Transport Engineering Co., Ltd.
- Cutting wheel for a cutting boring machine9 May 2024US 2024/0151142 A1Herrenknecht AG
Most cited
By later US patents
- Shielded cutterhead with small rolling disc cutters35US 5,961,185 AExcavation Engineering Associates, Inc. · 1999
- Tunnel boring machine with crusher29US 6,017,095 A2000
- Method and apparatus for continuously boring and lining tunnels and other like structures26US 4,793,736 A1988
- Tunnel driving apparatus with cutter arms internal and external of support tube25US 4,248,481 AGewerkschaft Eisenhutte Westfalia · 1981
- Shield tunneling machine25US 4,655,493 AKabushiki Kaisha Iseki Kaihatsu Koki · 1987