E21D 7/00
Shaft equipment
Official title: Shaft equipment, e.g. timbering within the shaft {(lifts in hoistways or mines B66B15/00 - B66B19/00)}
E21D7/00 (Shaft equipment) appears on 27 US grants and 23 published applications in this corpus.
Search patents in E21D- Granted patents
- 27
- Published applications
- 23
- Assignees
- 22
- Inventors
- 78
- Latest grant
- 3 Jan 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 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 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 2 |
| 2013 | 0 | 1 |
| 2014 | 3 | 0 |
| 2015 | 0 | 1 |
| 2016 | 1 | 4 |
| 2017 | 2 | 2 |
| 2018 | 3 | 0 |
| 2019 | 2 | 2 |
| 2020 | 0 | 2 |
| 2021 | 4 | 3 |
| 2022 | 2 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Two-piece guide bushing3 Jan 2023US 11,543,041 B2Halliburton Energy Services.Inc.
- Fracturing relief method for stress concentration of remaining ore pillars in overlying goaf12 Apr 2022US 11,299,954 B2China University of Mining and Technology
- Wellbore inspection system and method for ultra-deep vertical shaft4 Jan 2022US 11,215,046 B2China University of Mining and Technology
- Cageway connecting device and connecting method thereof14 Dec 2021US 11,199,091 B2Hefei Design & Research Inst. Of Coal Industry Co., LTD.
- Method for fixing a rail bracket of an elevator system, and elevator system30 Nov 2021US 11,186,464 B2Inventio AG
- Modular platform system for vertical ore stope mining11 Sep 2025US 2025/0283408 A1Nordic Minesteel Technologies Inc.
- Fracturing relief method for stress concentration of remaining ore pillars in overlying goaf11 Nov 2021US 2021/0348471 A1China University of Mining and Technology
- Wellbore inspection system and method for ultra-deep vertical shaft26 Aug 2021US 2021/0262336 A1China University of Mining and Technology
- Track synchronization moving apparatus of wellbore inspection system and control method thereof26 Aug 2021US 2021/0262337 A1China University of Mining and Technology
- Cageway connecting device and connecting method thereof23 Jul 2020US 2020/0232321 A1Hefei Desigh and Research Institute of Coal Industry Co., Ltd.
Most cited
By later US patents
- Elevator rail mounting bracket18US 3,948,358 ADover Corporation · 1976
- Mine shaft guide system12US 4,601,607 ALake Shore, Inc. · 1986
- Clamping means for elevator guide rails and the like10US 3,982,692 AR. Stahl Aufzuege GmbH · 1976
- Method and apparatus for developing shafts using small diameter shafts8US 5,513,903 ADeep Shaft Technology Inc. · 1996
- Shaft guide alignment measurement7US 4,627,170 AVaal Reefs Exploration and Mining Company Limited · 1986