E21B 21/18
Preventing exhaust air from the drill motor from blowing-off towards the working
Official title: Preventing exhaust air from the drill motor from blowing-off towards the working face
E21B21/18 (Preventing exhaust air from the drill motor from blowing-off towards the working) appears on 3 US grants and 3 published applications in this corpus.
Search patents in E21B- Granted patents
- 3
- Published applications
- 3
- Assignees
- 2
- Inventors
- 2
- Latest grant
- 2 Apr 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 2 |
| 2023 | 1 | 0 |
| 2024 | 1 | 0 |
By publication year.
Recent patents
- Down the hole drilling assembly and apparatus22 Sep 2022US 2022/0298864 A1Sandvik Mining and Construction Oy
- Down the hole drilling assembly exhaust assembly31 Mar 2022US 2022/0098943 A1Sandvik Mining and Construction Oy
- Down-the-hole Drill Reverse Exhaust System29 Jul 2010US 2010/0187017 A1Center Rock Inc.
Most cited
By later US patents