E21D 15/00
Props
Official title: Props (in the building art E04G25/00); Chocks {, e.g. made of flexible containers filled with backfilling material}
E21D15/00 (Props) appears on 206 US grants and 131 published applications in this corpus.
Search patents in E21D- Granted patents
- 206
- Published applications
- 131
- Assignees
- 131
- Inventors
- 428
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 2 | 0 |
| 1978 | 4 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 8 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 7 | 0 |
| 1986 | 5 | 0 |
| 1987 | 3 | 0 |
| 1988 | 3 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 4 | 0 |
| 1992 | 5 | 0 |
| 1993 | 5 | 0 |
| 1994 | 8 | 0 |
| 1995 | 8 | 0 |
| 1996 | 4 | 0 |
| 1997 | 7 | 0 |
| 1998 | 3 | 0 |
| 1999 | 4 | 0 |
| 2000 | 4 | 0 |
| 2001 | 3 | 1 |
| 2002 | 6 | 4 |
| 2003 | 6 | 3 |
| 2004 | 0 | 4 |
| 2005 | 1 | 4 |
| 2006 | 3 | 7 |
| 2007 | 2 | 5 |
| 2008 | 4 | 1 |
| 2009 | 2 | 4 |
| 2010 | 4 | 8 |
| 2011 | 5 | 6 |
| 2012 | 4 | 6 |
| 2013 | 2 | 11 |
| 2014 | 6 | 7 |
| 2015 | 6 | 8 |
| 2016 | 5 | 4 |
| 2017 | 5 | 9 |
| 2018 | 7 | 3 |
| 2019 | 6 | 4 |
| 2020 | 6 | 10 |
| 2021 | 8 | 5 |
| 2022 | 9 | 2 |
| 2023 | 1 | 1 |
| 2024 | 0 | 2 |
| 2025 | 1 | 9 |
| 2026 | 2 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21D 15/14Telescopic props97
- E21D 15/48Chocks or the like57
- E21D 15/50Component parts or details of props49
- E21D 15/02Non-telescopic props27
- E21D 15/005Props: characterised by the material9
- E21D 15/58Devices for setting props or chocks9
- E21D 15/60Devices for withdrawing props or chocks5
- E21D 15/002Auxiliary devices in which the prop type is not essential2
Recent patents
- Static crushing directional anchor withdrawal method at end of large-mining-height working face21 Apr 2026US 12,607,121 B2Huating Coal Group Co., Ltd.
- Asymmetric hydraulic supports for pseudo inclined mining in steeply dipping seam13 Jan 2026US 12,523,151 B2XI'AN UNIVERSITY OF SCIENCE AND TECHNOLOGY Xi'an, China
- Automatic support device for resisting rock burst in mines15 Apr 2025US 12,276,194 B2
- Pumpable crib bag18 Jul 2023US 11,702,935 B2FCI Holdings Delaware, Inc.
- System for navigation detection and inclination measurement of advanced hydraulic supports4 Oct 2022US 11,459,887 B2Shandong University of Science and Technology
- Pumpable hybrid cementitious material10 Sep 2026US 2026/0265145 A1Arizona Board of Regents on Behalf of the University of Arizona
- Filling and support container23 Jul 2026US 2026/0210249 A1Dsi Schaum Chemie Sp.Z O.O.
- A device for preventing actuation of a telescopic prop16 Jul 2026US 2026/0201715 A1R.J. Goldspink Pty Limited
- Pumpable crib bag assembly20 Nov 2025US 2025/0354491 A1ABC Industries, Inc.
- Suspended moving and adaptive coalburst-preventing hydraulic support with pile foundation18 Sep 2025US 2025/0290416 A1Liaoning University
Most cited
By later US patents
- Water-based industrial fluids54US 4,257,902 ASinger & Hersch Industrial Development (Pty.) Ltd. · 1981
- Load support48US 5,143,340 AFosroc International Limited · 1992
- Method and an apparatus for producing fabric-reinforced lining supports or slender supporting structural units39US 4,983,077 AGebhardt & Koenig-Gesteins- und Tiefbau GmbH · 1991
- Supporting of excavation roofs34US 4,255,071 ABochumer Eisenhutte Heintzmann GmbH & Co. KG · 1981
- Yieldable confined core mine roof support32US 5,308,196 AThe Coastal Corporation · 1994