E21D 15/16
With parts held together by positive means, with or without relative sliding
Official title: with parts held together by positive means, with or without relative sliding movement when the prop is subject to excessive pressure
E21D15/16 (With parts held together by positive means, with or without relative sliding) appears on 36 US grants and 20 published applications in this corpus.
Search patents in E21D- Granted patents
- 36
- Published applications
- 20
- Assignees
- 22
- Inventors
- 63
- Latest grant
- 3 May 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 1 |
| 2002 | 3 | 0 |
| 2003 | 1 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 1 |
| 2009 | 1 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 2 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 1 | 3 |
| 2016 | 1 | 0 |
| 2017 | 0 | 3 |
| 2018 | 2 | 0 |
| 2019 | 2 | 2 |
| 2020 | 1 | 1 |
| 2021 | 1 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Telescoping formwork support with twist-proof region3 May 2022US 11,319,714 B2Doka GmbH
- Base mechanism of single prop capable of being unloaded at reduced pressure19 Jan 2021US 10,895,154 B2China University of Mining and Technology
- Load support drum with resilient core member15 Sep 2020US 10,774,641 B2Micon
- Process method for withdrawing and recovering mechanical constant-resistance single prop16 Jul 2019US 10,352,167 B2China University of Mining and Technology
- Telescopic pumpable prop assembly with improved ceiling impact properties26 Mar 2019US 10,240,458 B2Cougar Can Company Pty Ltd.
- A device for preventing actuation of a telescopic prop16 Jul 2026US 2026/0201715 A1R.J. Goldspink Pty Limited
- Improved prop assemblies25 Jul 2024US 2024/0247506 A1R.J. Goldspink Pty Limited
- Formwork support29 Apr 2021US 2021/0123250 A1Doka GmbH
- Base mechanism of single prop capable of being unloaded at reduced pressure24 Sep 2020US 2020/0300088 A1China University of Mining and Technology
- Process method for withdrawing and recovering mechanical constant-resistance single prop21 Mar 2019US 2019/0085691 A1China University of Mining and Technology
Most cited
By later US patents
- 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
- Method and system for supporting a roof23US 4,185,940 A1980
- Prop for use in underground mining or tunnel construction17US 5,921,718 A1999