E21D 11/08
With preformed concrete slabs
Official title: with preformed concrete slabs {(backfilling the space between the slabs and the rock E21D11/105)}
E21D11/08 (With preformed concrete slabs) appears on 101 US grants and 80 published applications in this corpus.
Search patents in E21D- Granted patents
- 101
- Published applications
- 80
- Assignees
- 97
- Inventors
- 248
- Latest grant
- 9 Dec 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 6 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 1 | 0 |
| 1989 | 4 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 3 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 2 | 0 |
| 2003 | 3 | 3 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 0 | 2 |
| 2008 | 1 | 1 |
| 2009 | 0 | 2 |
| 2010 | 1 | 2 |
| 2011 | 0 | 0 |
| 2012 | 2 | 3 |
| 2013 | 0 | 2 |
| 2014 | 1 | 6 |
| 2015 | 1 | 2 |
| 2016 | 3 | 4 |
| 2017 | 2 | 5 |
| 2018 | 4 | 4 |
| 2019 | 1 | 7 |
| 2020 | 7 | 8 |
| 2021 | 4 | 7 |
| 2022 | 4 | 5 |
| 2023 | 4 | 3 |
| 2024 | 5 | 5 |
| 2025 | 4 | 3 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Segment with concrete embedded with fluid-filled steel pipes9 Dec 2025US 12,492,635 B2Tongji University
- Articulated prestressing tensioning device for shield tunnels and reinforcement method thereof2 Sep 2025US 12,404,771 B1Fujian University of Technology
- Control apparatus and method for buoyancy adjustment of shield tunnel segments29 Jul 2025US 12,371,994 B2Shenzhen Campus of Sun Yat-sen university
- System and method for simultaneous excavation and segment erection of TBM by thrust shell28 Jan 2025US 12,209,498 B2
- Centrifugal intelligent construction device for excavation concrete structure, and application thereof17 Sep 2024US 12,091,974 B2Zhejiang University
- Inverted arch structure and construction method therefor3 Sep 2026US 2026/0258727 A1China University of Geosciences
- Tunnel lining element28 May 2026US 2026/0146534 A1Herrenknecht AG
- Tunnel construction method and machine9 Apr 2026US 2026/0098474 A1MACCAFERRI TUNNELING S.r.l.
- Method for building a traffic tunnel, a conduit shaft, or a pressurised water shaft by way of the tubbing construction method2 Oct 2025US 2025/0305415 A1Sika Technology AG
- Jacking system for excavation construction of cross passage and construction method using the same4 Sep 2025US 2025/0277447 A1Ningbo Yonggong Technology Co., Ltd.
Most cited
By later US patents
- Reinforced earth structures and method of construction thereof25US 5,207,038 A1993
- Prefabricated support and covering structure, particularly for constructing tunnels, bridges and the like22US 4,693,634 ATensiter S.p.A. · 1987
- Method and apparatus for tunnel lining21US 4,830,536 ACommercial Shearing, Inc. · 1989
- Precast element for the construction of trenched structures and the process related thereto20US 4,073,148 AAlpina S.p.A. · 1978
- Method of manufacturing a tunnel or shaft lining or pipeline17US 6,328,501 B1Tarmac Heavy Building Materials UK Limited · 2001