E21D 20/021
Grouting with inorganic components
Official title: {Grouting with inorganic components, e.g. cement}
E21D20/021 (Grouting with inorganic components) appears on 68 US grants and 39 published applications in this corpus.
Search patents in E21D- Granted patents
- 68
- Published applications
- 39
- Assignees
- 46
- Inventors
- 140
- Latest grant
- 9 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 5 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 1 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 0 | 0 |
| 1987 | 3 | 0 |
| 1988 | 2 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 3 |
| 2002 | 3 | 0 |
| 2003 | 1 | 1 |
| 2004 | 1 | 1 |
| 2005 | 1 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 1 | 3 |
| 2013 | 1 | 0 |
| 2014 | 0 | 2 |
| 2015 | 1 | 6 |
| 2016 | 2 | 2 |
| 2017 | 1 | 2 |
| 2018 | 5 | 0 |
| 2019 | 0 | 2 |
| 2020 | 2 | 3 |
| 2021 | 0 | 3 |
| 2022 | 3 | 0 |
| 2023 | 1 | 3 |
| 2024 | 1 | 4 |
| 2025 | 3 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Active control method and device for large deformation of deep thin-bedded surrounding rock9 Jun 2026US 12,650,076 B2Huaneng Lancang River Hydropower Inc.
- Two-component composition for forming an injectable or pumpable organo-mineral material, and associated sealing methods and uses23 Dec 2025US 12,503,399 B2Weber Mining & Tunnelling
- Zonal bolt-grouting support device and method for cataclastic rock mass large deformation of high-stress tunnel2 Sep 2025US 12,404,772 B2Huaneng Lancang River Hydropower Inc.
- Chemical fastening method with an inorganic mortar system having aluminous cement and hard aggregate with mohs-hardness greater than or equal to 821 Jan 2025US 12,202,772 B2Hilti Aktiengesellschaft
- Support method of preset internal cable for in-situ tunnel expansion project27 Feb 2024US 11,913,338 B2Fuzhou University
- Rock bolt installation2 Oct 2025US 2025/0305416 A1Sandvik Mining and Construction Australia (Production/Supply) Pty Ltd
- Anchor Arrangement17 Oct 2024US 2024/0344457 A1Mohlalefi (Pty) Ltd.
- Fastening arrangement comprising a thread-forming screw and a cured aluminate-containing inorganic composition25 Jul 2024US 2024/0247676 A1Hilti Aktiengesellschaft
- Zonal bolt-grouting support device and method for cataclastic rock mass large deformation of high-stress tunnel2 May 2024US 2024/0141785 A1Huaneng Lancang River Hydropower Inc.
- Active control method and device for large deformation of deep thin-bedded surrounding rock2 May 2024US 2024/0141786 A1Huaneng Lancang River Hydropower Inc.
Most cited
By later US patents
- Inorganic cement grouting system for use in anchoring a bolt in a hole and compartmented package for use therewith34US 4,126,005 AE. I. Du Pont de Nemours and Company · 1978
- Cartridge for grouting an anchor element in a hole of a support structure32US 4,096,944 AThe United States of America as represented by the Secretary of the Interior · 1978
- Reactivatable set-inhibited cementitious compositions29US 4,455,171 ASociete Anonyme d'Explosifs et de Produits Chimiques · 1984
- Anchoring system for rock bolts28US 4,305,687 A1981
- High-early-strength phosphate grouting system for use in anchoring a bolt in a hole27US 4,174,227 AE. I. Du Pont de Nemours and Company · 1979