E21D 15/18
With one part resting on a supporting medium
Official title: with one part resting on a supporting medium, e.g. rubber, sand, bitumen, lead, located in the other part, with or without expulsion or displacement of the medium upon excessive pressure {(clamping pressure between telescopic prop elements by means of granular material E21D15/303)}
E21D15/18 (With one part resting on a supporting medium) appears on 15 US grants and 7 published applications in this corpus.
Search patents in E21D- Granted patents
- 15
- Published applications
- 7
- Assignees
- 8
- Inventors
- 22
- Latest grant
- 15 Sep 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 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 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 3 |
| 2016 | 1 | 0 |
| 2017 | 0 | 2 |
| 2018 | 1 | 0 |
| 2019 | 1 | 1 |
| 2020 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Load support drum with resilient core member15 Sep 2020US 10,774,641 B2Micon
- Telescopic pumpable prop assembly with improved ceiling impact properties26 Mar 2019US 10,240,458 B2Cougar Can Company Pty Ltd.
- Yieldable prop with yieldable insert12 Jun 2018US 9,995,140 B2FCI Holdings Delaware, Inc.
- Telescopic mine roof support24 May 2016US 9,347,316 B2Burrell Mining Products, Inc.
- Telescopic mine roof support7 Oct 2014US 8,851,805 B2Burrell Mining Products, Inc.
- Load support drum with resilient core member24 Jan 2019US 2019/0024508 A1Micon
- Telescopic mine roof support11 May 2017US 2017/0130580 A1
- Telescopic pumpable prop assembly with improved ceiling impact properties16 Feb 2017US 2017/0044897 A1Cougar Can Company Pty Ltd.
- Telescopic mine roof support24 Sep 2015US 2015/0267536 A1Burrell Mining Products, Inc.
- Telescopic mine roof support2 Jul 2015US 2015/0184512 A1Burrell Mining Products, Inc.
Most cited
By later US patents
- Support column27US 5,413,436 AMBK-Hydraulik Meuwsen & Brockhausen GmbH · 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
- Compressible mine support15US 4,052,029 AMine Support Systems (Proprietary) Limited · 1977