E21D 9/0678
Adding additives
Official title: {Adding additives, e.g. chemical compositions, to the slurry or the cuttings}
E21D9/0678 (Adding additives) appears on 11 US grants and 10 published applications in this corpus.
Search patents in E21D- Granted patents
- 11
- Published applications
- 10
- Assignees
- 19
- Inventors
- 49
- Latest grant
- 11 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 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 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 1 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 1 |
| 2021 | 1 | 2 |
| 2022 | 0 | 0 |
| 2023 | 1 | 3 |
| 2024 | 1 | 0 |
| 2025 | 2 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Ground drilling device11 Nov 2025US 12,467,320 B2
- Device and method for driving a tunnel15 Jul 2025US 12,359,566 B2Herrenknecht AG
- Mechanical tunneling apparatus and process for tunnel in quicksand stratum7 May 2024US 11,976,558 B2Shandong University
- Foaming additive with low ecotoxicological impact for soil conditioning in the presence of mechanised excavation11 Jul 2023US 11,697,768 B2Mapei S.P.A.
- Foaming additive for soil conditioning in the presence of mechanised excavation for tunnel construction9 Mar 2021US 10,941,343 B2Mapei S.P.A.
- Shield cutterhead for cutting diaphragm wall with steel i-beam29 Jan 2026US 2026/0028910 A1China Railway First Group Urban Track Transport Engineering Co., Ltd.
- Mechanical tunneling apparatus and process for tunnel in quicksand stratum28 Dec 2023US 2023/0417139 A1Shandong University
- Ground drilling device31 Aug 2023US 2023/0272674 A1
- Device and method for driviing a tunnel17 Aug 2023US 2023/0258084 A1Herrenknecht AG
- Foaming additive with low ecotoxicological impact for soil conditioning in the presence of mechanised excavation2 Sep 2021US 2021/0269718 A1Mapei S.P.A.
Most cited
By later US patents
- Shield tunnel boring machine23US 4,607,889 ADaiho Construction Co., Ltd. · 1986
- Tunnel boring with foamed composition6US 6,802,673 B1MBT Holding AG · 2004
- Hydrogel biocement systems and methods4US 10,794,029 B2Arizona Board of Regents on behalf of Arizona State University · 2020
- Material and method for lubricating the metal surfaces of an earth-pressure tunnel boring machine4US 6,287,052 B1Condat S.A. · 2001
- Earth pressure system shield process3US 5,180,252 AKabushiki Kaisha Komatsu Seisakusho · 1993