E21B 21/013
By liquids
Official title: {by liquids}
E21B21/013 (By liquids) appears on 4 US grants and 8 published applications in this corpus.
Search patents in E21B- Granted patents
- 4
- Published applications
- 8
- Assignees
- 10
- Inventors
- 31
- Latest grant
- 25 Feb 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2014 | 0 | 3 |
| 2015 | 0 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 2 |
| 2018 | 1 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year.
Subgroups
Granted patents
Recent patents
- Experimental apparatus for rock-breaking through vibration impact25 Feb 2025US 12,234,690 B2China University of Petroleum-Beijing
- Method of performing combined drilling, flushing, and cutting operations on coal seam having high gas content and prone to bursts to relieve pressure and increase permeability7 May 2019US 10,280,686 B2China University of Mining and Technology
- Systems and methods for fluid delivery in a longwall mining system13 Nov 2018US 10,125,606 B2Joy Global Underground Mining LLC
- Wet scrubber having a compact demister that requires reduced energy demand12 Jul 2016US 9,388,688 B2Cft S.P.A.
- Experimental apparatus for breaking rock through vibration impact24 Oct 2024US 2024/0352795 A1China University of Petroleum-Beijing
- Microwave rock-breaking drilling device21 Dec 2023US 2023/0407706 A1Shenzhen University
- Mining method13 Jan 2022US 2022/0010626 A1Ptrm Pty Ltd
- Method of performing combined drilling, flushing, and cutting operations on coal seam having high gas content and prone to bursts to relieve pressure and increase permeability28 Dec 2017US 2017/0370156 A1China University of Mining and Technology
- Systems and methods for fluid delivery in a longwall mining system9 Nov 2017US 2017/0321550 A1Joy MM Delaware, Inc.
Most cited
By later US patents