E21C 37/08
Devices with pistons, plungers, or the like, pressed locally against the wall
Official title: Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole {(E21C37/10 takes precedence)}
E21C37/08 (Devices with pistons, plungers, or the like, pressed locally against the wall) appears on 7 US grants and 5 published applications in this corpus.
Search patents in E21C- Granted patents
- 7
- Published applications
- 5
- Assignees
- 7
- Inventors
- 16
- Latest grant
- 29 Aug 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 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 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
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- Hydraulically operated splitting device7 Apr 2020US 10,612,377 B2Darda Inc.
- Cartridge for tunnel blasting5 Jul 2016US 9,382,796 B2Korea Railroad Research Institute
- Fluid actuated apparatus for mechanically splitting rock-like material13 Dec 1988US 4,790,602 A
- Fluid actuated apparatus for mechanically splitting rock-like material1 Nov 1988US 4,781,418 A
- Hybrid-type rock splitting packer using water pressure and rubber inflation pressure3 Oct 2024US 2024/0328316 A1Songam Co., Ltd
- Travelling-type tunnel hard-rock micro-damage cutting equipment and construction method associated therewith28 Jul 2022US 2022/0235658 A1Shandong Jianzhu University
- Hydraulically operated splitting device24 Jan 2019US 2019/0024507 A1Darda Inc.
- Cartridge for tunnel blasting16 Apr 2015US 2015/0102652 A1Korea Railroad Research Institute
- Device for breaking solid material and method of manufacturing a hose element for such a device3 Sep 2009US 2009/0218877 A1Emstone AB
Most cited
By later US patents