E21F 17/185
Rock-pressure control devices with or without alarm devices
Official title: {Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence (props with load-measuring devices E21D15/46)}
E21F17/185 (Rock-pressure control devices with or without alarm devices) appears on 68 US grants and 33 published applications in this corpus.
Search patents in E21F- Granted patents
- 68
- Published applications
- 33
- Assignees
- 61
- Inventors
- 221
- Latest grant
- 11 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 5 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 2 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 1 | 1 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 1 | 1 |
| 2009 | 1 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 0 | 3 |
| 2017 | 2 | 3 |
| 2018 | 3 | 1 |
| 2019 | 3 | 0 |
| 2020 | 1 | 6 |
| 2021 | 2 | 2 |
| 2022 | 3 | 2 |
| 2023 | 3 | 4 |
| 2024 | 4 | 0 |
| 2025 | 5 | 3 |
| 2026 | 0 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Device for real-time monitoring movement trajectory of mine roof strata and method thereof11 Nov 2025US 12,467,363 B1Shandong Energy Group Co., Ltd
- Coal and gas outburst monitoring device25 Mar 2025US 12,258,865 B2Henan Polytechnic University
- Warning device for a mining control module25 Feb 2025US 12,234,731 B2Caterpillar Inc.
- Automatic microseismic monitoring-intelligent rockburst early warning integrated system and method for tunnel boring machine (TBM)-based construction21 Jan 2025US 12,203,373 B2Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
- System for monitoring overlying roof rock and coal pillar of gob-side entry and method thereof21 Jan 2025US 12,203,374 B1
- "stress-displacement" intelligent early warning method for roof disaster23 Jul 2026US 2026/0210250 A1Guizhou University
- A displacement measuring device for installation in a rock hole26 Mar 2026US 2026/0085610 A1Innovative Mining Products (Pty) Ltd
- Early warning and emergency device for sudden stress change in surrounding rock and method of use12 Mar 2026US 2026/0071544 A1Zhalainur Coal Industry Limited Liability Company
- Device for real-time monitoring movement trajectory of mine roof strata and method thereof13 Nov 2025US 2025/0347226 A1Shandong Energy Group Co., Ltd
- Coal and gas outburst monitoring device27 Feb 2025US 2025/0067180 A1Henan Polytechnic University
Most cited
By later US patents
- Cuvette cartridge35US 4,178,345 AAbbott Laboratories · 1979
- Roof pressure monitoring system26US 4,581,712 A1986
- Method for characterization of rock strata in drilling operations20US 6,490,527 B1The United States of America as represented by the Department of Health and Human Services · 2002
- Device to monitor movement of a surface17US 4,136,556 AMassachusetts Institute of Technology · 1979
- Movement indicator16US 4,058,079 A1977