E21F 17/00
Methods or devices for use in mines or tunnels, not covered elsewhere
Official title: Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B)
E21F17/00 (Methods or devices for use in mines or tunnels, not covered elsewhere) appears on 500 US grants and 371 published applications in this corpus.
Search patents in E21F- Granted patents
- 500
- Published applications
- 371
- Assignees
- 353
- Inventors
- 1,511
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 10 | 0 |
| 1978 | 21 | 0 |
| 1979 | 13 | 0 |
| 1980 | 7 | 0 |
| 1981 | 20 | 0 |
| 1982 | 9 | 0 |
| 1983 | 6 | 0 |
| 1984 | 14 | 0 |
| 1985 | 7 | 0 |
| 1986 | 7 | 0 |
| 1987 | 12 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 3 | 0 |
| 1997 | 1 | 0 |
| 1998 | 9 | 0 |
| 1999 | 7 | 0 |
| 2000 | 3 | 0 |
| 2001 | 5 | 1 |
| 2002 | 9 | 1 |
| 2003 | 5 | 4 |
| 2004 | 2 | 4 |
| 2005 | 2 | 7 |
| 2006 | 1 | 3 |
| 2007 | 4 | 8 |
| 2008 | 8 | 7 |
| 2009 | 3 | 7 |
| 2010 | 5 | 4 |
| 2011 | 1 | 12 |
| 2012 | 5 | 13 |
| 2013 | 11 | 16 |
| 2014 | 13 | 22 |
| 2015 | 16 | 25 |
| 2016 | 20 | 18 |
| 2017 | 25 | 21 |
| 2018 | 16 | 12 |
| 2019 | 20 | 13 |
| 2020 | 11 | 27 |
| 2021 | 22 | 27 |
| 2022 | 18 | 23 |
| 2023 | 17 | 16 |
| 2024 | 30 | 29 |
| 2025 | 18 | 23 |
| 2026 | 15 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- System and method for controlling roof support18 Aug 2026US 12,709,982 B2Joy Global Underground Mining LLC
- Underground mine energy management system4 Aug 2026US 12,697,896 B2Caterpillar Inc.
- Tunnel automatic monitoring and measurement equipment and method based on fixed-point tour measurement14 Jul 2026US 12,680,452 B2Guizhou Transportation Planning Survey & Design Academe Co.LTD
- Coal spontaneous combustion downhole detection system and method based on self-potential method14 Jul 2026US 12,681,203 B2Shandong University of Science and Technology
- Tunnel operation robot16 Jun 2026US 12,654,790 B2China Railway Design Corporation (CRDC)
- Method and system for predicting blasting vibration inside surrounding rocks in deep buried tunnels1 Oct 2026US 2026/0298084 A1Northeastern University
- Energy-saving and environment-friendly intelligent thermal insulation air chamber for tunnels in cold regions and setting method thereof10 Sep 2026US 2026/0266180 A1Southwest Jiaotong University
- Composition, method and system for stabilising a rock mass13 Aug 2026US 2026/0234890 A1Stratalock Pty Ltd
- Filling and support container23 Jul 2026US 2026/0210249 A1Dsi Schaum Chemie Sp.Z O.O.
- "stress-displacement" intelligent early warning method for roof disaster23 Jul 2026US 2026/0210250 A1Guizhou University
Most cited
By later US patents
- Personnel monitoring and locating system218US 4,495,496 AJohnson Engineering Corporation · 1985
- Long range multiple point wireless control and monitoring system121US 4,968,978 AStolar, Inc. · 1990
- Underground battery vault system for communications applications102US 6,617,973 B12003
- Staff-location and signalling system for use in mines90US 4,495,495 ARuhrkohle Aktiengesellschaft · 1985
- Long range multiple point wireless control and monitoring system86US 5,087,099 AStolar, Inc. · 1992