E21D 21/0013
Protection against corrosion
Official title: {Protection against corrosion}
E21D21/0013 (Protection against corrosion) appears on 13 US grants and 9 published applications in this corpus.
Search patents in E21D- Granted patents
- 13
- Published applications
- 9
- Assignees
- 13
- Inventors
- 31
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 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 | 1 | 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 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 1 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 1 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Corrosion protection device, corrosion protection system, corrosion-protected embankment stabilization system, and method for corrosion-protected anchoring of a geotechnical anchor element12 Aug 2025US 12,385,207 B2Geobrugg AG
- Self-draining rock anchor23 Apr 2019US 10,267,148 B1Nevada Industrial LLC
- Strand, cable bolt and its installation6 Mar 2018US 9,909,419 B2Minova International Limited
- Yieldable cone bolt and method of manufacturing same16 Jul 2013US 8,485,758 B2
- Corrosion-protected, self-drilling anchor and anchor subunit and method for the production thereof27 Mar 2012US 8,142,109 B2DYWIDAG-Systems International GmbH
- Rock Bolt Device with Replaceable Head16 Apr 2026US 2026/0103982 A1
- Corrosion protection device, corrosion protection system, corrosion-protected embankment stabilization system, and method for corrosion-protected anchoring of a geotechnical anchor element8 Feb 2024US 2024/0044096 A1Geobrugg AG
- Corrosion Resistant Expandable Bolt17 May 2018US 2018/0135411 A1FCI Holdings Delaware, Inc.
- Anti-Friction Washer System21 Jan 2016US 2016/0017709 A1FCI Holdings Delaware, Inc.
- Strand, cable bolt and its installation12 Feb 2015US 2015/0043976 A1Minova International Limited
Most cited
By later US patents
- Friction rock stabilizer and sheathing means, in combination, and method of securing a friction rock stabilizer in an earth bore29US 4,490,074 AIngersoll-Rand Company · 1984
- Coupler for ducts used in post-tension rock anchorage systems26US 5,775,849 A1998
- Anchor elements14US 4,302,131 AFosroc International Limited · 1981
- Friction rock stabilizer and a method of isolating the same from a bore surface14US 4,400,113 AIngersol-Rand Company · 1983
- Method of anchoring a borehole anchor9US 4,179,861 AFosroc A.G. · 1979