E21D 15/512
Arrangement of valves
Official title: {Arrangement of valves (external control of roof support installations E21D23/12, E21D23/26)}
E21D15/512 (Arrangement of valves) appears on 17 US grants and 4 published applications in this corpus.
Search patents in E21D- Granted patents
- 17
- Published applications
- 4
- Assignees
- 17
- Inventors
- 30
- Latest grant
- 13 Jun 2000
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 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 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 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
- Hydraulically trippable check valve for underground mine support hydraulics13 Jun 2000US 6,073,654 ADBT Deutsche Bergbau-Technik GmbH
- Valves14 Sep 1999US 5,950,673 AJoy MM Delaware, Inc.
- Prestressing of mine props23 Sep 1997US 5,669,739 AHL&H Timber Products (Proprietary) Limited
- Support prop with integrated pressure limiting valve and nailed pipes18 Mar 1997US 5,611,646 ARichard Voss Grubenausbau GmbH
- Pressure-compensated pressure limiting valve31 Oct 1995US 5,462,076 ARichard Voss Grubenausbau GmbH
- Support prop27 Mar 2025US 2025/0101869 A1Msp Mine Support Products (Pty) Ltd
- Valve24 Sep 2015US 2015/0267822 A1Mine Support Products (Pty) Ltd
- Support prop13 Mar 2014US 2014/0072374 A1Elbroc Mining Products (Pty) Ltd
- Support for underground mining and tunnel construction13 Aug 2009US 2009/0202310 A1Bochumer Eisenhutte Heintzmann GmbH & Co. KG
Most cited
By later US patents
- Pressure-limiting valve23US 4,660,595 AHermann Hemscheidt Maschinenfabrik GmbH & Co. · 1987
- Pressure relief valve16US 4,091,838 ADowty Mining Equipment Limited · 1978
- Excess pressure valve particularly for a fluid pressure operated telescopic supporting element employed in underground mining11US 4,274,435 AThyssen Industrie AG · 1981
- Valve units for use in hydraulic control systems of mining equipment11US 5,159,872 AGewerkschaft Eisenhutte Westfalia · 1992
- Valves10US 5,950,673 AJoy MM Delaware, Inc. · 1999