E21D 9/0692
Cutter drive shields
Official title: {Cutter drive shields}
E21D9/0692 (Cutter drive shields) appears on 38 US grants and 3 published applications in this corpus.
Search patents in E21D- Granted patents
- 38
- Published applications
- 3
- Assignees
- 9
- Inventors
- 42
- Latest grant
- 6 Sep 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 5 | 0 |
| 1978 | 7 | 0 |
| 1979 | 6 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 1 |
| 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 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Mobile underground tunnel borer arrangement6 Sep 2022US 11,434,762 B2Drilling Technical Services (Pty) Ltd
- Shield-carried noncontact frequency-domain electrical real-time advanced detection system and method16 Apr 2019US 10,260,345 B2Shandong University
- Method and apparatus for feeding a tunnel roof support system from the roof shield of a TBM22 Oct 2002US 6,468,000 B2C & M McNally Engineering Corp.
- Method and device for keeping outfall drainage in service during sewerage construction28 Apr 1998US 5,743,676 AMeyer & John GmbH & Co. Tief- und Rohrleitungsbau
- Device for opening and supporting a headway14 Dec 1993US 5,269,628 A
- Mobile underground tunnel borer arrangement26 Nov 2020US 2020/0370434 A1Drilling Technical Servics (Pty) Ltd
- Shield-carried noncontact frequency-domain electrical real-time advanced detection system and method26 Oct 2017US 2017/0306757 A1Shandong University
- Method and apparatus for feeding a tunnel roof support system from the roof shield of a TBM25 Jul 2002US 2002/0098043 A1C & M McNally Engineering Corp.
Most cited
By later US patents
- Drive shield for tunneling apparatus and a method for operating such a shield17US 4,099,388 AGewerkschaft Eisenhutte Westfalia · 1978
- Tunnel driving apparatus13US 4,063,425 AGewerkschaft Eisenhutte Westfalia · 1977
- Method of, and apparatus for, driving and lining tunnels11US 4,147,453 AGewerkschaft Eisenhutte Westfalia · 1979
- Apparatus for and a method of constructing a tunnel9US 4,043,137 AGewerkschaft Eisenhutte Westfalia · 1977
- Tunnel drive shield8US 4,334,800 AGewerkschaft Eisenhutte Westfalia · 1982