E21D 21/0046
Formed by a plurality of elements arranged longitudinally
Official title: {formed by a plurality of elements arranged longitudinally}
E21D21/0046 (Formed by a plurality of elements arranged longitudinally) appears on 50 US grants and 59 published applications in this corpus.
Search patents in E21D- Granted patents
- 50
- Published applications
- 59
- Assignees
- 39
- Inventors
- 124
- Latest grant
- 21 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 4 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 2002 | 3 | 1 |
| 2003 | 0 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 1 |
| 2007 | 0 | 3 |
| 2008 | 0 | 3 |
| 2009 | 1 | 2 |
| 2010 | 1 | 1 |
| 2011 | 1 | 2 |
| 2012 | 2 | 6 |
| 2013 | 1 | 0 |
| 2014 | 2 | 2 |
| 2015 | 2 | 3 |
| 2016 | 3 | 4 |
| 2017 | 3 | 2 |
| 2018 | 1 | 8 |
| 2019 | 5 | 5 |
| 2020 | 5 | 4 |
| 2021 | 3 | 2 |
| 2022 | 1 | 1 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 2 | 2 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Dynamic rockbolt21 Apr 2026US 12,607,123 B2FCI Holdings Delaware, Inc.
- Dolly for rockbolt2 Dec 2025US 12,486,769 B2FCI Holdings Delaware, Inc.
- Rock bolt assembly having an indicator15 Apr 2025US 12,276,195 B2Rocbolt Technologies (Pty) Ltd.
- Retainer device for a rock anchor, rock anchor system and associated installation method22 Aug 2023US 11,732,583 B2Jusand Nominees Pty Ltd
- Type of energy-absorbing rock bolt device with umbrella-shaped structure8 Mar 2022US 11,268,383 B2Institute of Geology and Geophysics, Chinese Academy of Sciences
- Dynamic rock bolt assembly8 Oct 2026US 2026/0309029 A1Geomechanical Services and Innovations Inc.
- Dolly for Rockbolt26 Feb 2026US 2026/0055706 A1FCI Holdings Delaware, Inc.
- Dynamic Rockbolt19 Jun 2025US 2025/0198288 A1FCI Holdings Delaware, Inc.
- Rock bolt20 Mar 2025US 2025/0092787 A1Msp Mine Support Products (Pty) Ltd
- Dolly for Rockbolt31 Oct 2024US 2024/0360760 A1FCI Holdings Delaware, Inc.
Most cited
By later US patents
- Cable bolt and method of use in supporting a rock formation32US 5,511,909 AJennmar Corporation · 1996
- Mine roof support apparatus and method29US 5,375,946 AF. M. Locotos Equipment & Design Co. · 1994
- Anchoring system for rock bolts28US 4,305,687 A1981
- Cable bolt26US 6,428,243 B1Quantax PTY LTD · 2002
- Resin anchored rock or mine roof bolt anchor mechanism23US 4,132,080 AStratabolt Corporation · 1979