E21D 21/0053
Anchoring-bolts in the form of lost drilling rods
Official title: {Anchoring-bolts in the form of lost drilling rods}
E21D21/0053 (Anchoring-bolts in the form of lost drilling rods) appears on 66 US grants and 78 published applications in this corpus.
Search patents in E21D- Granted patents
- 66
- Published applications
- 78
- Assignees
- 44
- Inventors
- 137
- Latest grant
- 10 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 2 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 3 |
| 2002 | 4 | 2 |
| 2003 | 2 | 0 |
| 2004 | 0 | 4 |
| 2005 | 2 | 3 |
| 2006 | 4 | 1 |
| 2007 | 0 | 7 |
| 2008 | 2 | 2 |
| 2009 | 0 | 7 |
| 2010 | 1 | 5 |
| 2011 | 4 | 4 |
| 2012 | 3 | 6 |
| 2013 | 2 | 2 |
| 2014 | 5 | 1 |
| 2015 | 2 | 3 |
| 2016 | 2 | 4 |
| 2017 | 1 | 1 |
| 2018 | 0 | 5 |
| 2019 | 5 | 3 |
| 2020 | 0 | 2 |
| 2021 | 3 | 3 |
| 2022 | 0 | 0 |
| 2023 | 1 | 3 |
| 2024 | 2 | 2 |
| 2025 | 2 | 1 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Drill head injection system for a self-drilling rock bolt assembly10 Mar 2026US 12,571,309 B2Oka Rock Bolt Technologies Pty Limited
- Dolly for rockbolt2 Dec 2025US 12,486,769 B2FCI Holdings Delaware, Inc.
- Friction fit drill bit assembly for a self-drilling rock bolt1 Apr 2025US 12,264,585 B2Innovative Mining Products (Pty) Ltd
- Setting device and setting method for self-drilling anchor bolt24 Dec 2024US 12,172,283 B2Hilti Aktiengesellschaft
- Drilling assembly for inserting a rock bolt21 May 2024US 11,988,094 B2
- Drill Head Injection System for a Self-Drilling Rock Bolt Assembly10 Sep 2026US 2026/0266179 A1Oka Rock Bolt Technologies Pty Limited
- Integrated rapid excavation equipment for rock roadways and method thereof28 May 2026US 2026/0146533 A1China University of Mining and Technology
- A displacement measuring device for installation in a rock hole26 Mar 2026US 2026/0085610 A1Innovative Mining Products (Pty) Ltd
- Dolly for Rockbolt26 Feb 2026US 2026/0055706 A1FCI Holdings Delaware, Inc.
- Expansion anchor system having improved bullet therefor28 Aug 2025US 2025/0270929 A1
Most cited
By later US patents
- Anchor rod for composite anchors40US 5,735,653 AHilti Aktiengesellschaft · 1998
- Unitary drill bit and roof bolt35US 4,055,051 AThe United States of America as represented by the Secretary of the Interior · 1977
- Self-tapping, and self-tapping and self-drilling, rock bolts29US 5,433,558 ABHP Engineering Pty Ltd · 1995
- Anchor rod, method of setting it in place and method of its manufacture20US 4,393,638 AUpat GmbH & Co. · 1983
- Anchoring bolt20US 4,518,290 AUpat GmbH & Co. · 1985