E21D 20/026
Cartridges
Official title: {Cartridges; Grouting charges}
E21D20/026 (Cartridges) appears on 104 US grants and 51 published applications in this corpus.
Search patents in E21D- Granted patents
- 104
- Published applications
- 51
- Assignees
- 53
- Inventors
- 179
- Latest grant
- 2 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 5 | 0 |
| 1978 | 1 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 7 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 6 | 0 |
| 1986 | 3 | 0 |
| 1987 | 5 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 3 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 3 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 1 | 1 |
| 2009 | 0 | 1 |
| 2010 | 2 | 3 |
| 2011 | 1 | 3 |
| 2012 | 0 | 5 |
| 2013 | 5 | 6 |
| 2014 | 3 | 1 |
| 2015 | 3 | 4 |
| 2016 | 2 | 0 |
| 2017 | 3 | 2 |
| 2018 | 0 | 3 |
| 2019 | 2 | 1 |
| 2020 | 2 | 4 |
| 2021 | 3 | 3 |
| 2022 | 3 | 2 |
| 2023 | 2 | 4 |
| 2024 | 0 | 1 |
| 2025 | 3 | 1 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Bolter2 Jun 2026US 12,644,385 B2Joy Global Underground Mining LLC
- Drill head injection system for a self-drilling rock bolt assembly10 Mar 2026US 12,571,309 B2Oka Rock Bolt Technologies Pty Limited
- Hollow rod shear connector having static mixing system and method for setting a hollow rod shear connector in a rock layer5 Aug 2025US 12,378,885 B2Jmbg GmbH + Co KG
- Hollow rod composite anchor with improved setting capability and method for setting a hollow rod composite anchor into a rock stratum5 Aug 2025US 12,378,886 B2Jmbg GmbH + Co KG
- Bolter6 May 2025US 12,291,968 B2Joy Global Underground Mining LLC
- Bolter24 Sep 2026US 2026/0286845 A1Joy Global Underground Mining LLC
- Drill Head Injection System for a Self-Drilling Rock Bolt Assembly10 Sep 2026US 2026/0266179 A1Oka Rock Bolt Technologies Pty Limited
- Bolter14 Aug 2025US 2025/0257658 A1Joy Global Underground Mining LLC
- A Drill Head Injection System for a Self-Drilling Rock Bolt Assembly20 Jun 2024US 2024/0200452 A1Oka Rock Bolt Technologies Pty Limited
- Bolter28 Dec 2023US 2023/0417141 A1Joy Global Underground Mining LLC
Most cited
By later US patents
- Organic grouting composition for anchoring a bolt in a hole60US 4,280,943 AE. I. Du Pont de Nemours and Company · 1981
- Squirt cartridge for mixing and dispensing a two-component mass56US 4,676,406 AUpat GmbH & Co. · 1987
- Unitary drill bit and roof bolt35US 4,055,051 AThe United States of America as represented by the Secretary of the Interior · 1977
- Cartridge for use in fixing an anchor bolt and a method28US 4,729,696 AAsahi Kasei Kogyo Kabushiki Kaisha · 1988
- Resin-containing cartridges and process for sealing solid structures or for anchoring bolts and rods therein27US 4,353,463 AMinnesota Mining and Manufacturing Company · 1982