- All sections
- E - Fixed constructions
- E21B - Earth or rock drillingobtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 21/015 - Means engaging the bore entrance, e.g. hoods for collecting dust
Patent holdings for IPC class E21B 21/015
Total number of patents in this class: 70
10-year publication summary
|
4
|
2
|
6
|
10
|
3
|
4
|
5
|
5
|
2
|
1
|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | 2026 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| China University of Mining and Technology | 1313 |
4 |
| Sandvik Mining and Construction Oy | 890 |
4 |
| Xuzhou Boan Science & Technology Development Co., Ltd | 11 |
4 |
| Hilti Aktiengesellschaft | 3689 |
3 |
| Bauer Maschinen GmbH | 246 |
3 |
| Erimek Oy | 7 |
3 |
| Trelleborg Industri AB | 7 |
3 |
| Aquirian Technology Pty Ltd | 34 |
3 |
| Caterpillar Inc. | 10284 |
2 |
| BP Corporation North America Inc. | 750 |
2 |
| Caterpillar Global Mining Equipment LLC | 181 |
2 |
| IKM Cleandrill AS | 6 |
2 |
| Nabors Drilling Technologies USA, Inc. | 575 |
2 |
| Kinetic Pressure Control Limited | 92 |
2 |
| Epiroc Rock Drills Aktiebolag | 663 |
2 |
| Halliburton Energy Services, Inc. | 21318 |
1 |
| Illinois Tool Works Inc. | 11862 |
1 |
| Weatherford Technology Holdings, LLC | 2162 |
1 |
| Kennametal Inc. | 1357 |
1 |
| Atlas Copco Rock Drills AB | 123 |
1 |
| Other owners | 24 |