E21C 37/20
Mining or quarrying: other methods or devices for dislodging with or without
Official title: by ultrasonic waves
E21C37/20 (Mining or quarrying: other methods or devices for dislodging with or without) appears on 3 US grants and 5 published applications in this corpus.
Search patents in E21C- Granted patents
- 3
- Published applications
- 5
- Assignees
- 4
- Inventors
- 30
- Latest grant
- 9 Apr 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 2015 | 0 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 2 |
| 2018 | 0 | 0 |
| 2019 | 1 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 1 | 1 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. 2026 runs to 8 Oct.
Recent patents
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- Rock breaking seismic source and active source three-dimensional seismic combined advanced detection system using tunnel boring machine31 Dec 2019US 10,519,771 B2Shangdong University
- Acoustic source fragmentation system for breaking ground material18 Oct 2016US 9,468,932 B2Elwha LLC
- Enhanced extraction system and method based on ultrasonic excitation and acid fracturing integrated permeability enhancement for coal seam23 Apr 2026US 2026/0110247 A1Chongqing University
- Atmospheric Asteroid Miner/Packager8 Feb 2024US 2024/0044250 A1
- Rock breaking seismic source and active source three-dimensional seismic combined advanced detection system using tunnel boring machine3 Aug 2017US 2017/0218757 A1Shandong University
- Acoustic source fragmentation system for breaking ground material19 Jan 2017US 2017/0016324 A1
- Acoustic source fragmentation system for breaking ground material18 Jun 2015US 2015/0165445 A1Elwha LLC
Most cited
By later US patents