E21D 15/54
Details of the ends of props
Official title: Details of the ends of props (for permitting step-by-step movement E21D23/06)
E21D15/54 (Details of the ends of props) appears on 17 US grants and 11 published applications in this corpus.
Search patents in E21D- Granted patents
- 17
- Published applications
- 11
- Assignees
- 14
- Inventors
- 51
- Latest grant
- 19 Jan 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
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| 2004 | 0 | 1 |
| 2005 | 1 | 0 |
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| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
| 2012 | 0 | 1 |
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| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 2 | 0 |
| 2019 | 1 | 1 |
| 2020 | 1 | 2 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Base mechanism of single prop capable of being unloaded at reduced pressure19 Jan 2021US 10,895,154 B2China University of Mining and Technology
- Apparatus for protecting roof tray when gob-side entry retaining end support migrates3 Nov 2020US 10,822,949 B1China Mining & Civil New Material Science and Technology Ltd.
- Apparatus and method for pre-loading mechanical constant-resistance single prop20 Aug 2019US 10,385,692 B2China University of Mining and Technology
- Adapter for a formwork support structure6 Nov 2018US 10,119,282 B2Form 700 Pty Ltd
- Yieldable prop with yieldable insert12 Jun 2018US 9,995,140 B2FCI Holdings Delaware, Inc.
- Improved prop assemblies25 Jul 2024US 2024/0247506 A1R.J. Goldspink Pty Limited
- Base mechanism of single prop capable of being unloaded at reduced pressure24 Sep 2020US 2020/0300088 A1China University of Mining and Technology
- Electromagnetic coil dispenser for improving waterproof performance18 Jun 2020US 2020/0190980 A1
- Apparatus and method for pre-loading mechanical constant-resistance single prop21 Mar 2019US 2019/0085690 A1China University of Mining and Technology
- An adapter for a formwork support structure9 Mar 2017US 2017/0067263 A1Form 700 Pty Ltd
Most cited
By later US patents
- Yieldable mine post having a double ball and socket configuration26US 5,538,364 A1996
- Ball-and-socket type connections for use with mining apparatus10US 4,004,771 AGewerkschaft Eisenhutte Westfalia · 1977
- Mine prop9US 6,910,834 B2Burrell Mining Products, Inc. · 2005
- Quick-release pit prop8US 5,967,702 A1999
- Mine support having a linearly moveable and/or pivoting end plate8US 8,052,352 B2FCI Holdings Delaware, Inc. · 2011