E21F 17/18
Special adaptations of signalling or alarm devices
Official title: Special adaptations of signalling or alarm devices (for mine lifts B66B; gas-sensitive devices per se G01N)
E21F17/18 (Special adaptations of signalling or alarm devices) appears on 204 US grants and 176 published applications in this corpus.
Search patents in E21F- Granted patents
- 204
- Published applications
- 176
- Assignees
- 163
- Inventors
- 809
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 8 | 0 |
| 1979 | 7 | 0 |
| 1980 | 3 | 0 |
| 1981 | 6 | 0 |
| 1982 | 2 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 3 | 0 |
| 1986 | 1 | 0 |
| 1987 | 3 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 4 | 0 |
| 2003 | 3 | 2 |
| 2004 | 0 | 1 |
| 2005 | 1 | 2 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 1 | 3 |
| 2009 | 2 | 3 |
| 2010 | 0 | 3 |
| 2011 | 1 | 3 |
| 2012 | 4 | 7 |
| 2013 | 3 | 5 |
| 2014 | 4 | 5 |
| 2015 | 4 | 10 |
| 2016 | 3 | 8 |
| 2017 | 12 | 12 |
| 2018 | 9 | 3 |
| 2019 | 9 | 6 |
| 2020 | 6 | 19 |
| 2021 | 13 | 15 |
| 2022 | 9 | 14 |
| 2023 | 14 | 10 |
| 2024 | 24 | 14 |
| 2025 | 9 | 13 |
| 2026 | 9 | 17 |
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
- 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)
- Dual-power hydraulic roof bolter16 Jun 2026US 12,655,762 B2Hebei Jinglong Intelligent Equipment Co., Ltd.
- Method and system for predicting blasting vibration inside surrounding rocks in deep buried tunnels1 Oct 2026US 2026/0298084 A1Northeastern University
- "stress-displacement" intelligent early warning method for roof disaster23 Jul 2026US 2026/0210250 A1Guizhou University
- Method for arranging water exploration structure based on borehole-tunnel induced polarization and method for inversion water exploration by using the same16 Jul 2026US 2026/0202570 A1Shandong University
- Process and system for mine excavation monitoring16 Jul 2026US 2026/0203938 A1Orica International Pte Ltd
- Slope stability monitoring system for spoil grounds9 Jul 2026US 2026/0195597 A1Chang An 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
- 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
- Method of transmitting data from a drillhead57US 5,268,683 AStolar, Inc. · 1993