E21D 23/049
Connecting devices between the head or foot of a prop and the
Official title: {Connecting devices between the head or foot of a prop and the cap or base of the roof support}
E21D23/049 (Connecting devices between the head or foot of a prop and the) appears on 5 US grants and 5 published applications in this corpus.
Search patents in E21D- Granted patents
- 5
- Published applications
- 5
- Assignees
- 5
- Inventors
- 9
- Latest grant
- 8 May 2018
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 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 | 1 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 1 | 1 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Advancing ram pin retention device8 May 2018US 9,963,966 B2Joy MM Delaware, Inc.
- Advancing ram pin retention device28 Mar 2017US 9,605,539 B2Joy MM Delaware, Inc.
- Prop head bearing device for shield supports4 Oct 2016US 9,458,716 B2Caterpillar Global Mining Europe GmbH
- Prop head bearing10 Apr 2007US 7,201,541 B2DBT GmbH
- Foot element and cooperable strut element for use in a roof support mechanism7 Jun 1988US 4,749,311 AKlockner-Becorit GmbH
- Roof Support Unit for a Mining Machine22 May 2025US 2025/0163807 A1Caterpillar Inc.
- Advancing Ram Pin Retention Device1 Jun 2017US 2017/0152746 A1Joy MM Delaware, Inc.
- Advancing ram pin retention device11 Aug 2016US 2016/0230554 A1Joy MM Delaware, Inc.
- Prop head bearing device for shield supports25 Sep 2014US 2014/0286713 A1Caterpillar Global Mining Europe GmbH
- Prop head bearing2 Feb 2006US 2006/0024138 A1DBT GmbH
Most cited
By later US patents
- Prop head bearing14US 7,201,541 B2DBT GmbH · 2007
- Foot element and cooperable strut element for use in a roof support mechanism4US 4,749,311 AKlockner-Becorit GmbH · 1988
- Prop head bearing device for shield supports1US 9,458,716 B2Caterpillar Global Mining Europe GmbH · 2016
- Advancing ram pin retention device1US 9,605,539 B2Joy MM Delaware, Inc. · 2017