E21F 5/08
Rock dusting of mines
Official title: Rock dusting of mines; Depositing other protective substances
E21F5/08 (Rock dusting of mines) appears on 30 US grants and 32 published applications in this corpus.
Search patents in E21F- Granted patents
- 30
- Published applications
- 32
- Assignees
- 29
- Inventors
- 83
- Latest grant
- 10 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 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 | 1 |
| 2004 | 1 | 3 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 4 |
| 2013 | 2 | 4 |
| 2014 | 1 | 2 |
| 2015 | 3 | 4 |
| 2016 | 2 | 2 |
| 2017 | 2 | 3 |
| 2018 | 1 | 1 |
| 2019 | 2 | 2 |
| 2020 | 2 | 3 |
| 2021 | 2 | 1 |
| 2022 | 2 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Fire-prevention and extinguishing material for plugging air leakage in underground barrier pillar of coal mine and use method thereof10 Jun 2025US 12,326,087 B1China University of Mining and Technology
- Non-caking mine rock dust for use in underground coal mines23 Aug 2022US 11,421,531 B2Imerys USA, Inc.
- Mine safety dust and method of production14 Jun 2022US 11,359,491 B1E. Dillon & Company
- Moisture tolerant rock dust and methods of application thereof7 Sep 2021US 11,111,786 B2Imerys USA, Inc.
- Mine safety dust and method of production1 Jun 2021US 11,021,956 B1E. Dillon & Company
- Process for obtaining ore dust suppressant resin, ores dust suppressant resin, process for inhibition of ore particulate emission and resin use1 May 2025US 2025/0136855 A1Universidade Federal Do Espírito Santo—UFES
- Plastic gel material for preventing spontaneous combustion of coal27 May 2021US 2021/0154510 A1Shandong University of Science and Technology
- Apparatus for mixing and applying particulate matter and foam17 Dec 2020US 2020/0391062 A1Rusmar Incorporated
- Sprayable foamed rock dust composition and method of using the same13 Aug 2020US 2020/0254291 A1Allied Foam Tech Corp.
- Non-caking mine rock dust for use in underground coal mines9 Apr 2020US 2020/0109629 A1Imerys USA, Inc.
Most cited
By later US patents
- Methods and apparatus for rock dusting mine tunnels13US 4,805,702 AUtah Power & Light · 1989
- Rock dust blower12US 4,394,975 A1983
- Rock dusting apparatus10US 6,135,368 A2000
- Method of dusting coal mine surfaces9US 6,726,849 B2Construction Research & Technology GmbH · 2004
- Mine dusting machine8US 4,673,131 A1987