E21D 11/18
Arch members
Official title: Arch members {; Network made of arch members (E21D11/36 takes precedence); Ring elements; Polygon elements; Polygon elements inside arches (caps for arches E21D17/00)}
E21D11/18 (Arch members) appears on 56 US grants and 38 published applications in this corpus.
Search patents in E21D- Granted patents
- 56
- Published applications
- 38
- Assignees
- 55
- Inventors
- 215
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 4 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 1 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 3 |
| 2013 | 1 | 1 |
| 2014 | 1 | 1 |
| 2015 | 2 | 1 |
| 2016 | 1 | 1 |
| 2017 | 0 | 3 |
| 2018 | 0 | 1 |
| 2019 | 3 | 2 |
| 2020 | 0 | 3 |
| 2021 | 3 | 6 |
| 2022 | 4 | 4 |
| 2023 | 2 | 1 |
| 2024 | 4 | 4 |
| 2025 | 4 | 3 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21D 11/22Clamps or other yieldable means for interconnecting adjacent arch members either rigidly16
- E21D 11/20Special cross- sections11
- E21D 11/183Supporting means for arch members, not provided for in e21d11/226
- E21D 11/24Knuckle joints or links between arch members4
- E21D 11/186Pre-stressing or dismantling devices therefor2
- E21D 11/26Shoes for connecting arch members to longitudinal struts0
Recent patents
- Pipe rehabilitation method19 May 2026US 12,631,281 B2Shonan Gosei-Jushi-Seisakusho K. K.
- Excavation compensation method for tunnelling in deep rock engineering13 Jan 2026US 12,523,150 B1China University of Mining and Technology, Beijing
- Tertiary cooperative compression yielding and energy-absorbing support mechanism8 Jul 2025US 12,352,168 B1China University of Mining and Technology, Beijing
- Composite supporting structure combining fabric-form bag-behind-wall grouting and high-strength support frames, and construction method thereof17 Jun 2025US 12,331,642 B1Shandong Jianzhu University
- Rotary digging drill and amphibious tunnel construction robot using same29 Apr 2025US 12,286,884 B2Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
- Tunnel construction method and machine9 Apr 2026US 2026/0098474 A1MACCAFERRI TUNNELING S.r.l.
- Structural plates and methods of constructing arch-shaped structures using structural plates10 Jul 2025US 2025/0223774 A1Ail International Inc.
- Composite support structure combining bag-based backfill grouting and high-strength support frame, and construction method19 Jun 2025US 2025/0198286 A1Shandong Jianzhu University
- Rotary digging drill and amphibious tunnel construction robot using same3 Apr 2025US 2025/0109689 A1Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
- Tunnel constraint anchor cable and method for improving stability of initial support structure7 Nov 2024US 2024/0368991 A1Chang An University
Most cited
By later US patents
- Process and device for the assembly of voussoirs for tunnel linings14US 4,318,637 APont-A-Mousson S. A. · 1982
- Composite arch structure14US 4,390,306 AArmco Inc. · 1983
- Connector for bolted joints11US 4,160,609 AHollybank Engineering Company Limited · 1979
- Reinforcement of arch type structure with beveled/skewed ends11US 7,217,064 B12007
- Mine roadway support stilt9US 4,382,721 AHolywell Engineering Limited · 1983