- 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 21/16 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
Patent holdings for IPC class E21B 21/16
Total number of patents in this class: 61
10-year publication summary
|
6
|
5
|
7
|
5
|
8
|
7
|
4
|
3
|
7
|
2
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Saudi Arabian Oil Company | 13316 |
4 |
| Epiroc Rock Drills Aktiebolag | 527 |
4 |
| Schlumberger Technology Corporation | 10848 |
3 |
| Halliburton Energy Services, Inc. | 20937 |
3 |
| Corbas Marketing, Inc. | 10 |
3 |
| Sandvik Intellectual Property AB | 1476 |
3 |
| Joy Global Surface Mining Inc | 366 |
3 |
| Atlas Copco Drilling Solutions LLC | 14 |
2 |
| Bauer Maschinen GmbH | 228 |
2 |
| Sandvik Mining and Construction Oy | 836 |
2 |
| Southwest Petroleum University | 475 |
2 |
| Technological Resources Pty. Limited | 457 |
2 |
| Caterpillar Inc. | 9604 |
1 |
| Massachusetts Institute of Technology | 10093 |
1 |
| Smith International, Inc. | 719 |
1 |
| Arizona Board of Regents on behalf of Arizona State University | 2658 |
1 |
| Barbco, Inc. | 13 |
1 |
| BGP Inc., China National Petroleum Corporation | 86 |
1 |
| BP Exploration Operating Company Limited | 270 |
1 |
| China Petroleum & Chemical Corporation | 1907 |
1 |
| Other owners | 20 |