E21D 23/144
Measuring the advance of support units with respect to internal points of
Official title: {Measuring the advance of support units with respect to internal points of reference, e.g. with respect to neighboring support units or extension of a cylinder}
E21D23/144 (Measuring the advance of support units with respect to internal points of) appears on 12 US grants and 4 published applications in this corpus.
Search patents in E21D- Granted patents
- 12
- Published applications
- 4
- Assignees
- 11
- Inventors
- 35
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Detection device and method for working surface, terminal, and storage medium24 Mar 2026US 12,584,410 B2Taiyuan University of Technology
- Method and device for monitoring operation of a mining machine unit5 Sep 2023US 11,746,655 B2Caterpillar Inc.
- Method for implementing a centralized control platform of hydraulic support on fully mechanized mining working face in underground coal mines19 May 2020US 10,655,467 B2Taiyuan University of Technology
- Method of working coal seams to a defined preset depth of cutting during ploughing with a cutter4 Jan 1994US 5,275,469 AHermann Hemscheidt Maschinenfabrik GmbH & Co.
- Measurement of the alignment of an articulated mine conveyor8 Sep 1992US 5,145,235 AGullick Dobson Limited
- Detection device and method for working surface, terminal, and storage medium11 Apr 2024US 2024/0117740 A1Taiyuan University of Technology
- Method and device for monitoring operation of a mining machine unit5 May 2022US 2022/0136390 A1Caterpillar SARL
- Method for implementing a centralized control platform of hydraulic support on fully mechanized mining working face in underground coal mines17 May 2018US 2018/0135412 A1Taiyuan University of Technology
- Method for the Automated Production of a Defined Face Opening by Means of Slope-Assisted Radar Navigation of the Roller of a Roller Cutter Loader26 Apr 2012US 2012/0098325 A1
Most cited
By later US patents
- Method of controlling the movement of a longwall excavation front, especially the face or breast of a coal seam29US 4,887,935 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1989
- Control system for longwall mining roof supports15US 4,518,285 AGebr. Eickhoff, Maschinenfabrik und Eisengiesserei m.b.H. · 1985
- Mine roof support control8US 4,134,270 AGullick Dobson Limited · 1979
- Process for the automated winning of mineral, such as coal, in a longwall working6US 5,137,336 AGerwerkschaft Eisenhutte Westfalia GmbH · 1992
- Method of working coal seams to a defined preset depth of cutting during ploughing with a cutter5US 5,275,469 AHermann Hemscheidt Maschinenfabrik GmbH & Co. · 1994