E21D 9/0875
With a movable support arm carrying cutting tools for attacking the front
Official title: {with a movable support arm carrying cutting tools for attacking the front face, e.g. a bucket}
E21D9/0875 (With a movable support arm carrying cutting tools for attacking the front) appears on 90 US grants and 18 published applications in this corpus.
Search patents in E21D- Granted patents
- 90
- Published applications
- 18
- Assignees
- 59
- Inventors
- 195
- Latest grant
- 16 Jul 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 5 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 2 |
| 2006 | 3 | 0 |
| 2007 | 0 | 1 |
| 2008 | 2 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 4 |
| 2015 | 3 | 0 |
| 2016 | 1 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 0 | 2 |
| 2020 | 3 | 0 |
| 2021 | 1 | 1 |
| 2022 | 0 | 1 |
| 2023 | 1 | 1 |
| 2024 | 2 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Hypergravity model test device and method for simulating progressive failure of shield tunnel face16 Jul 2024US 12,037,907 B2Powerchina Huadong Engineering Corporation Limited
- Tunnel digging machine (TDM)20 Feb 2024US 11,905,835 B1
- Cutting assembly for a mining machine19 Dec 2023US 11,846,189 B2Sandvik Mining and Construction Oy
- Hard rock roadway and tunnel boring machine with actively rotating hobs14 Dec 2021US 11,199,092 B2China University of Mining and Technology
- Laser-assisted tunnel boring machine and rock fragmenting method therefor12 May 2020US 10,648,334 B2Dalian University of Technology
- Cutting assembly for a mining machine16 Feb 2023US 2023/0048925 A1Sandvik Mining and Construction Oy
- Hypergravity model test device and method for simulating progressive failure of shield tunnel face21 Jul 2022US 2022/0228486 A1Powerchina Huadong Engineering Corporation Limited
- Hard rock roadway and tunnel boring machine with actively rotating hobs29 Jul 2021US 2021/0231013 A1China University of Mining and Technology
- Tunnel boring machine29 Aug 2019US 2019/0264563 A1Xcmg-Kaigong Heavy Industry Nanjing Co., Ltd
- Laser-assisted tunnel boring machine and rock fragmenting method therefor17 Jan 2019US 2019/0017380 A1Dalian University of Technology
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
- 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
- Shield tunneling machine24US 4,456,305 AHitachi Shipbuilding & Engineering Co., Ltd. · 1984