E21C 35/302
Measuring, signaling or indicating specially adapted for machines for slitting or completely
Official title: {Measuring, signaling or indicating specially adapted for machines for slitting or completely freeing the mineral (measuring or indicating on tunneling machines E21D9/003)}
E21C35/302 (Measuring, signaling or indicating specially adapted for machines for slitting or completely) appears on 163 US grants and 114 published applications in this corpus.
Search patents in E21C- Granted patents
- 163
- Published applications
- 114
- Assignees
- 90
- Inventors
- 363
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 6 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 4 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 4 | 0 |
| 1988 | 1 | 0 |
| 1989 | 5 | 0 |
| 1990 | 4 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 5 | 0 |
| 1994 | 2 | 0 |
| 1995 | 0 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 1 |
| 2002 | 3 | 5 |
| 2003 | 3 | 1 |
| 2004 | 3 | 1 |
| 2005 | 2 | 3 |
| 2006 | 0 | 0 |
| 2007 | 0 | 1 |
| 2008 | 3 | 3 |
| 2009 | 1 | 1 |
| 2010 | 3 | 6 |
| 2011 | 1 | 5 |
| 2012 | 3 | 6 |
| 2013 | 5 | 6 |
| 2014 | 9 | 3 |
| 2015 | 6 | 6 |
| 2016 | 7 | 10 |
| 2017 | 7 | 9 |
| 2018 | 9 | 10 |
| 2019 | 6 | 5 |
| 2020 | 2 | 4 |
| 2021 | 6 | 7 |
| 2022 | 6 | 4 |
| 2023 | 3 | 3 |
| 2024 | 0 | 8 |
| 2025 | 5 | 2 |
| 2026 | 4 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Underground mine energy management system4 Aug 2026US 12,697,896 B2Caterpillar Inc.
- Cutting tool mounting assembly with split, modular and wireless wear detection system16 Jun 2026US 12,654,230 B2Kennametal Inc.
- Tunnel tunneling system3 Mar 2026US 12,565,837 B2Ccteg Taiyuan Research Institute
- Method for training coal rock interface recognition model, method for cutting control of shearer, and intelligent control system20 Jan 2026US 12,529,314 B2Beijing Ccri-Tianma Automation Technology Co., Ltd.
- Milling machine and method for operating a milling machine2 Dec 2025US 12,486,766 B2Wirtgen GmbH
- Monitoring system for excavation equipment8 Oct 2026US 2026/0311313 A1Tesmec S.P.A.
- Method and material removal system14 May 2026US 2026/0132715 A1Rockfeel GmbH
- Sensor system and a method for a mining vehicle9 Apr 2026US 2026/0098473 A1Sandvik Mining and Construction Oy
- Dual-person dual-machine measurement method for mining and transportation equipment2 Apr 2026US 2026/0092522 A1Taiyuan University of Technology
- Method and system for monitoring coal shearer status based on digital twinning, and electronic device8 May 2025US 2025/0146413 A1Taiyuan University of Technology
Most cited
By later US patents
- Long range multiple point wireless control and monitoring system121US 4,968,978 AStolar, Inc. · 1990
- Long range multiple point wireless control and monitoring system86US 5,087,099 AStolar, Inc. · 1992
- Automated excavation machine69US 7,695,071 B2Minister of Natural Resources · 2010
- Fiber optic remote control system for a continuous miner and method of use58US 5,295,733 ATamrock World Corporation, N.V. · 1994
- Method of transmitting data from a drillhead57US 5,268,683 AStolar, Inc. · 1993