E21D 9/008
Driving transverse tunnels starting from existing tunnels
Official title: {Driving transverse tunnels starting from existing tunnels}
E21D9/008 (Driving transverse tunnels starting from existing tunnels) appears on 8 US grants and 5 published applications in this corpus.
Search patents in E21D- Granted patents
- 8
- Published applications
- 5
- Assignees
- 11
- Inventors
- 43
- Latest grant
- 2 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 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 | 0 |
| 2015 | 0 | 2 |
| 2016 | 1 | 1 |
| 2017 | 1 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Right-angle turning method for small-diameter TBM exploration adit excavation2 Sep 2025US 12,404,770 B2Powerchina Northwest Engineering Corporation Limited
- Guiding type miniature pipe-jacking construction method31 May 2022US 11,346,218 B1Guangzhou Municipal Engineering Group Ltd.
- Procedure for the construction of cross passages in double pipe tunnels13 Feb 2018US 9,890,637 B2Palmiere S.p.A.
- Auxiliary tunneling apparatus11 Apr 2017US 9,617,853 B2Komatsu Ltd.
- Tunnel excavation method12 Jul 2016US 9,388,690 B2Komatsu Ltd.
- Jacking system for excavation construction of cross passage and construction method using the same4 Sep 2025US 2025/0277447 A1Ningbo Yonggong Technology Co., Ltd.
- Right-angle turning method for small-diameter tbm exploration adit excavation9 May 2024US 2024/0151143 A1Powerchina Northwest Engineering Corporation Limited
- Procedure for the construction of cross passages in double pipe tunnels3 Nov 2016US 2016/0319664 A1Palmiere S.p.A.
- Auxiliary tunneling apparatus19 Mar 2015US 2015/0078831 A1Komatsu Ltd.
- Tunnel excavation method12 Mar 2015US 2015/0069815 A1Komatsu Ltd.
Most cited
By later US patents
- Formation of cavities in the bed of a sheet of water3US 3,998,061 AC. G. Doris (Compagnie Generale pour les Developement Operationnels des Richesses Sous-marines) · 1976
- Method of building underground cavern and tunneling machine3US 5,118,220 AKabushiki Kaisha Kematsu Seisakusho · 1992
- Main-ancillary tunnel excavator3US 5,634,692 AMitsubishi Jukogyo Kabushiki Kaisha · 1997
- Procedure for the construction of cross passages in double pipe tunnels1US 9,890,637 B2Palmiere S.p.A. · 2018