E21D 9/0635
Tail sealing means
Official title: {Tail sealing means, e.g. used as end shuttering}
E21D9/0635 (Tail sealing means) appears on 20 US grants and 5 published applications in this corpus.
Search patents in E21D- Granted patents
- 20
- Published applications
- 5
- Assignees
- 21
- Inventors
- 46
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 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 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 1 | 1 |
| 2024 | 2 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Movable visual inspection device for shield machines28 Apr 2026US 12,613,199 B2China Railway Sunward Engineering Equipment Co., Ltd.
- Hypergravity model test device and method for simulating progressive failure of shield tunnel face16 Jul 2024US 12,037,907 B2Powerchina Huadong Engineering Corporation Limited
- Shield sealing device and shield sealing method20 Feb 2024US 11,905,834 B2China Railway 14th Bureau Group Corporation Limited
- Shield method14 Mar 2023US 11,603,760 B2Mutsubishi Rubber Co., Ltd.
- Tunnel excavating machine and excavating method22 Jul 2003US 6,595,724 B2Mitsubishi Heavy Industries, Ltd.
- Movable visual inspection device for shield machines8 May 2025US 2025/0146954 A1China Railway Sunward Engineering Equipment Co., Ltd.
- Shield Sealing Device and Shield Sealing Method9 Feb 2023US 2023/0037876 A1China Railway 14th Bureau Group Corporation Limited
- Hypergravity model test device and method for simulating progressive failure of shield tunnel face21 Jul 2022US 2022/0228486 A1Powerchina Huadong Engineering Corporation Limited
- Shield method14 Jul 2022US 2022/0220850 A1Mutsubishi Rubber Co., Ltd.
- Tunnel excavating machine and excavating method14 Mar 2002US 2002/0031403 A1Mitsubishi Heavy Industries, Ltd.
Most cited
By later US patents
- Tail packing for a slurry pressurized shield30US 4,209,268 AOhbayashi-Gumi, Ltd. · 1980
- Process for making a tunnel and advancing a tunneling read with a wall-supporting shield15US 4,911,578 AHochtief Aktiengesellschaft Vorm. Gebr. Helfmann · 1990
- Sealing means12US 3,979,920 ANational Research Development Corporation · 1976
- Tunnel driving apparatus8US 4,398,845 AGewerkschaft Eisenhutte Westfalia · 1983
- Apparatus and method for tunnel construction with shield drive8US 4,557,627 ALocher & Cie AGZZ · 1985