E21D 9/0621
Shield advancing devices
Official title: {Shield advancing devices}
E21D9/0621 (Shield advancing devices) appears on 23 US grants and 10 published applications in this corpus.
Search patents in E21D- Granted patents
- 23
- Published applications
- 10
- Assignees
- 17
- Inventors
- 47
- Latest grant
- 20 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 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 | 1 | 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 | 1 |
| 2014 | 1 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 2 | 2 |
| 2024 | 2 | 1 |
| 2025 | 2 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Energy device for shield machines20 Jan 2026US 12,529,315 B2China Railway Sunward Engineering Equipment Co., Ltd.
- Methods for real-time deviation monitoring of miniature pipe roofing jacking pipe of spiral soil-discharging19 Aug 2025US 12,392,609 B2Cccc First Harbor Engineering Co., Ltd.
- Method and system of constructing an underground tunnel5 Aug 2025US 12,378,884 B2hyperTunnel IP Limited
- Tunnel digging machine (TDM)20 Feb 2024US 11,905,835 B1
- Propulsion control device of tunnel boring machine for 3D printing a tunnel16 Jan 2024US 11,873,718 B1Zhejiang University City College
- Tunnel Lining Method and Apparatus26 Feb 2026US 2026/0055705 A1Colin Eddie Consulting Limited
- Methods for real-time deviation monitoring of miniature pipe roofing jacking pipe of spiral soil-discharging17 Jul 2025US 2025/0231026 A1Cccc First Harbor Engineering Co., Ltd.
- Energy device for shield machines7 Nov 2024US 2024/0368990 A1China Railway Sunward Engineering Equipment Co., Ltd.
- Tunnelling shield22 Jun 2023US 2023/0193758 A1hyperTunnel IP Limited
- Method and system of constructing an underground tunnel8 Jun 2023US 2023/0175395 A1hyperTunnel IP Limited
Most cited
By later US patents
- Tunnel boring machine and method35US 5,890,771 A1999
- Shield tunneling machine25US 4,655,493 AKabushiki Kaisha Iseki Kaihatsu Koki · 1987
- Shield tunneling apparatus20US 4,624,605 AKabushiki Kaisha Iseki Kaihatsu Koki · 1986
- Tunnel drive shield19US 4,122,683 AGewerkschaft Eisenhutte Westfalia · 1978
- Direction correcting device for shield tunnelling machine16US 5,061,120 AKabushiki Kaisha Iseki Kaihatsu Koki · 1991