E21D 3/00
Raising shafts, i.e. working upwards from the bottom
E21D3/00 (Raising shafts, i.e. working upwards from the bottom) appears on 16 US grants and 13 published applications in this corpus.
Search patents in E21D- Granted patents
- 16
- Published applications
- 13
- Assignees
- 19
- Inventors
- 55
- Latest grant
- 9 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 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 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 0 | 3 |
| 2004 | 2 | 0 |
| 2005 | 1 | 1 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 2 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 1 |
| 2022 | 1 | 1 |
| 2023 | 0 | 2 |
| 2024 | 0 | 0 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Wear support assemblies for raise boring tools9 Sep 2025US 12,410,665 B2Sandvik Mining and Construction Tools AB
- Method and apparatus for the bottom-up construction of vertical risers from underground passes through the soil, using a pipe jacking equipment13 Sep 2022US 11,441,423 B2Webuild S.P.A.
- Battery powered mechanized raise climbing system29 Jan 2013US 8,362,721 B2J. S. Redpath Ltd.
- Side shift raise climbing system2 Aug 2011US 7,987,794 B2J. S. Redpath Ltd.
- Easily-cuttable tunnel segment structure28 Feb 2006US 7,004,679 B2GEOSTR Corporation
- Secondary shaft completion construction method based on raise boring process1 Oct 2026US 2026/0298085 A1China Three Gorges Construction Engineering Corporation
- Wear support assemblies for raise boring tools6 Jul 2023US 2023/0212916 A1Sandvik Mining and Construction Tools AB
- Drill Cuttings Measurement Box and System for Controlling Pilot Hole Drilling9 Mar 2023US 2023/0072291 A1Redpath Canada Limited
- Stall Control System for Raise Drills and Raise Boring Machines8 Dec 2022US 2022/0389764 A1Redpath Canada Limited
- Method and apparatus for the bottom-up construction of vertical risers from underground passes through the soil, using a pipe jacking equipment22 Jul 2021US 2021/0222495 A1Salini Impregilo S.P.A.
Most cited
By later US patents
- Inflatable gripper assembly for rock boring machine27US 5,649,745 AAtlas Copco Robbins Inc. · 1997
- Upward tunneling11US 4,009,909 AThe Robbins Company · 1977
- Method and apparatus for establishing the drilling line of an overhead boring machine9US 3,999,616 AThe Robbins Company · 1976
- Method and apparatus for tunneling upwardly7US 4,114,698 ASmith International, Inc. · 1978
- Apparatus for driving an upwardly directed shaft in rock5US 4,986,374 AGruvprodukter I Gallivare AB · 1991