E21D 15/14
Telescopic props
Official title: Telescopic props (general means for fixing telescopic parts together {F16B7/10})
E21D15/14 (Telescopic props) appears on 97 US grants and 65 published applications in this corpus.
Search patents in E21D- Granted patents
- 97
- Published applications
- 65
- Assignees
- 64
- Inventors
- 223
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 3 | 0 |
| 1992 | 1 | 0 |
| 1993 | 5 | 0 |
| 1994 | 3 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 4 | 2 |
| 2003 | 2 | 2 |
| 2004 | 0 | 2 |
| 2005 | 0 | 2 |
| 2006 | 2 | 3 |
| 2007 | 1 | 3 |
| 2008 | 4 | 1 |
| 2009 | 1 | 3 |
| 2010 | 1 | 1 |
| 2011 | 2 | 2 |
| 2012 | 2 | 3 |
| 2013 | 1 | 7 |
| 2014 | 2 | 3 |
| 2015 | 4 | 6 |
| 2016 | 4 | 1 |
| 2017 | 3 | 4 |
| 2018 | 2 | 0 |
| 2019 | 3 | 3 |
| 2020 | 3 | 5 |
| 2021 | 2 | 3 |
| 2022 | 7 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 5 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- E21D 15/44Hydraulic, pneumatic, or hydraulic-pneumatic props40
- E21D 15/16With parts held together by positive means, with or without relative sliding36
- E21D 15/28With parts held relatively to each other by friction or gripping25
- E21D 15/46With load-measuring devices5
- E21D 15/15Means counteracting entry of dirt2
Recent patents
- 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
- System for navigation detection and inclination measurement of advanced hydraulic supports4 Oct 2022US 11,459,887 B2Shandong University of Science and Technology
- Hydraulic shield support system and pressure intensifier26 Jul 2022US 11,396,894 B2Caterpillar Global Mining Europe GmbH
- Similar simulation experimental device of hydraulic energy-absorbing roadway support10 May 2022US 11,326,452 B1China University of Mining and Technology
- A device for preventing actuation of a telescopic prop16 Jul 2026US 2026/0201715 A1R.J. Goldspink Pty Limited
- Suspended moving and adaptive coalburst-preventing hydraulic support with pile foundation18 Sep 2025US 2025/0290416 A1Liaoning University
- Jacking system for excavation construction of cross passage and construction method using the same4 Sep 2025US 2025/0277447 A1Ningbo Yonggong Technology Co., Ltd.
- Asymmetric hydraulic supports for pseudo inclined mining in steeply dipping seam10 Apr 2025US 2025/0116192 A1Xi'an University of Science and Technology
- Convergence monitor13 Feb 2025US 2025/0052156 A1R.J. Goldspink Pty Limited
Most cited
By later US patents
- Yieldable mine post30US 5,015,125 A1991
- Support column27US 5,413,436 AMBK-Hydraulik Meuwsen & Brockhausen GmbH · 1995
- Yieldable roof support system26US 5,400,994 ADyckerhoff & Widmann AG of Munich · 1995
- Yieldable mine roof support26US 6,394,707 B1Jack Kennedy Metal Products & Buildings, Inc. · 2002
- Continuously adjustable rescue strut25US 6,394,405 B1Para Tech Incorporated · 2002