E21D 15/20
With pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches
Official title: with pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches, holes, or the like, spaced apart at intervals
E21D15/20 (With pawl, pin, cross-piece, or the like engaging with ratchet teeth, notches) appears on 3 US grants and 4 published applications in this corpus.
Search patents in E21D- Granted patents
- 3
- Published applications
- 4
- Assignees
- 2
- Inventors
- 11
- Latest grant
- 19 Jan 2021
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 1 |
| 2018 | 1 | 0 |
| 2019 | 1 | 1 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
By publication year.
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
- Process method for withdrawing and recovering mechanical constant-resistance single prop16 Jul 2019US 10,352,167 B2China University of Mining and Technology
- Temporary support and raising device13 Nov 2018US 10,125,608 B2Mmc Innovations LLP
- Base mechanism of single prop capable of being unloaded at reduced pressure24 Sep 2020US 2020/0300088 A1China University of Mining and Technology
- Process method for withdrawing and recovering mechanical constant-resistance single prop21 Mar 2019US 2019/0085691 A1China University of Mining and Technology
- Temporary Support and Raising Device28 Sep 2017US 2017/0275994 A1Mmc Innovations LLP
- Mine prop jack and method of prestressing a mine prop14 Jun 2012US 2012/0148350 A1
Most cited
By later US patents