E21D 15/28
With parts held relatively to each other by friction or gripping
Official title: with parts held relatively to each other by friction or gripping
E21D15/28 (With parts held relatively to each other by friction or gripping) appears on 25 US grants and 19 published applications in this corpus.
Search patents in E21D- Granted patents
- 25
- Published applications
- 19
- Assignees
- 15
- Inventors
- 35
- Latest grant
- 19 Apr 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 1 |
| 2004 | 0 | 2 |
| 2005 | 0 | 1 |
| 2006 | 2 | 2 |
| 2007 | 0 | 3 |
| 2008 | 4 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 1 | 1 |
| 2012 | 1 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 2 |
| 2020 | 2 | 2 |
| 2021 | 1 | 0 |
| 2022 | 1 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
- E21D 15/32By a deformable collar or clamping means applied symmetrically inside a locking9
- E21D 15/30By means expanded or contracted by pressure applied through the medium of4
- E21D 15/285By means of wedges or wedge combinations3
- E21D 15/38With longitudinally-divided upper or lower prop parts3
- E21D 15/40Collar or other support gripped to one or both parts by toggle-action3
- E21D 15/42With special parts to influence the friction3
- E21D 15/43Details of wedges2
- E21D 15/34By axially- moving balls, rollers, or the like1
All 9 subgroupsShow fewer
Recent patents
- Support post19 Apr 2022US 11,306,497 B2Safetyrespect AB
- Mine roof support, pre-installation assembly for same, and method of installation5 Oct 2021US 11,136,887 B2Burrell Mining Products, Inc.
- Mine roof support, pre-installation assembly for same, and method of installation3 Nov 2020US 10,822,948 B2Burrell Mining Products, Inc.
- Load support drum with resilient core member15 Sep 2020US 10,774,641 B2Micon
- Yieldable support prop and method2 Sep 2014US 8,821,075 B2Strata Products Worldwide, LLC
- Improved prop assemblies25 Jul 2024US 2024/0247506 A1R.J. Goldspink Pty Limited
- Support post31 Dec 2020US 2020/0407990 A1Safetyrespect AB
- Mine roof support, pre-installation assembly for same, and method of installation15 Oct 2020US 2020/0325776 A1Burrell Mining Products, Inc.
- Mine roof support, pre-installation assembly for same, and method of installation4 Jul 2019US 2019/0203597 A1Burrell Mining Products, Inc.
- Load support drum with resilient core member24 Jan 2019US 2019/0024508 A1Micon
Most cited
By later US patents